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august 2007 1 mic2570 mic2570 micrel, inc. mic2570 two-cell switching regulator general description micrels mic2570 is a micropower boost switching regulator that operates from two alkaline, two nickel-metal-hydride cells, or one lithium cell. the mic2570 accepts a positive input voltage between 1.3v and 15v. its typical no-load supply current is 130a. the mic2570 is available in selectable ?xed output or ad - justable output versions. the mic2570-1 can be con?gured for 2.85v, 3.3v, or 5v by connecting one of three separate feedback pins to the output. the mic2570-2 can be con?g - ured for an output voltage ranging between its input voltage and 36v, using an external resistor network. the mic2570 has a ?xed switching frequency of 20khz. an external sync connection allows the switching frequency to be synchronized to an external signal. the mic2570 requires only four components (diode, inductor, input capacitor and output capacitor) to implement a boost regulator. a complete regulator can be constructed in a 0.6 in 2 area. all versions are available in an 8-lead soic with an operating range from C40c to +85. typical applications features ? operates from a two-cell supply 1.3v to 15v operation ? 130a typical quiescent current ? complete regulator ?ts 0.6 in 2 area ? 2.85v/3.3v/5v selectable output voltage (mic2570-1) ? adjustable output up to 36v (mic2570-2) ? 1a current limited pass element ? frequency synchronization input ? 8-lead soic package applications ? lcd bias generator ? glucose meters ? single-cell lithium to 3.3v or 5v converters ? two-cell alkaline to 5v converters ? two-cell alkaline to C5v converters ? battery-powered, hand-held instruments ? palmtop computers ? remote controls ? detectors ? battery backup supplies two-cell to 5v dc-to-dc converter in s w gnd mic2570-1 c2 220f 10v 5v/100ma c1 100f 10v 2.0vC3.1v 2 aa cells 2.85v 3.3v 5v 2 4 5 6 1 7 8 l1 47h s y n c d1 m bra140 single-cell lithium to 3.3v/80maregulator gnd 3.3v s w mic2570 s y n c 7 5 1 2 8 in c3 330f 6.3v v ou t 3.3v/80ma 2.5v to 4.2v 1 li cell c1 100f 10v d1 mbra140 l1 50h l1 c2 100f 10v u1 1 2 3 4 micrel, inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
mic2570 micrel, inc. mic2570 2 august 2007 ordering information part number temperature range voltage frequency package standard pb-free mic2570-1bm mic2570-1ym C40oc to +85oc selectable* 20khz 8-pin soic mic2570-2bm MIC2570-2YM C40oc to +85oc adjustable 20khz 8-pin soic * externally selectable for 2.85v, 3.3v, or 5v pin con?guration 1 2 3 4 8 7 6 5 s w gnd n c 5v in s y n c 2.85v 3.3v mic2570-1 selectable voltage 20khz frequency 1 2 3 4 8 7 6 5 in s y n c f b n c s w gnd n c n c mic2570-2 adjustable voltage 20khz frequency 8-lead soic (m) pin description pin no. (version ? ) pin name pin function 1 sw switch: npn output switch transistor collector. 2 gnd power ground: npn output switch transistor emitter. 3 nc not internally connected. 4 (-1) 5v 5v feedback (input): fixed 5v feedback to internal resistive divider . 4 (-2) nc not internally connected. 5 (-1) 3.3v 3.3v feedback (input): fixed 3.3v feedback to internal resistive divider . 5 (-2) nc not internally connected. 6 (-1) 2.85v 2.85v feedback (input): fixed 2.85v feedback to internal resistive divider . 6 (-2) fb feedback (input): 0.22v feedback from external voltage divider network. 7 sync synchronization (input): oscillator start timing. oscillator synchronizes to falling edge of sync signal. 8 in supply (input): positive supply voltage input. ? example: (-1) indicates the pin description is applicable to the mic2570 -1 only.
august 2007 3 mic2570 mic2570 micrel, inc. electrical characteristics v in = 2.5v; t a = 25c, bold indicates C40c t a 85c; unless noted parameter condition min typ max units input voltage startup guaranteed, i sw = 100ma 1.3 15 v quiescent current output switch off 130 a fixed feedback voltage mic2570-1; v 2.85v pin = v out , i sw = 100ma 2.7 2.85 3.0 v mic2570-1; v 3.3v pin = v out , i sw = 100ma 3.14 3.30 3.47 v mic2570-1; v 5v pin = v out , i sw = 100ma 4.75 5.00 5.25 v reference voltage mic2570-2, [adj. voltage versions], i sw = 100ma, note 1 208 220 232 mv comparator hysteresis mic2570-2, [adj. voltage versions] 6 mv output hysteresis mic2570-1; v 2.85v pin = v out , i sw = 100ma 65 mv mic2570-1; v 3.3v pin = v out , i sw = 100ma 75 mv mic2570-1; v 5v pin = v out , i sw = 100ma 120 mv feedback current mic2570-1; v 2.85v pin = v out 6 a mic2570-1; v 3.3v pin = v out 6 a mic2570-1; v 5v pin = v out 6 a mic2570-2 [adj. voltage versions]; v fb = 0v 25 na reference line regulation 1.5v v in 15v 0.35 %/v switch saturation voltage v in = 1.3v, i sw = 300ma 250 mv v in = 1.5v, i sw = 800ma 450 mv v in = 3.0v, i sw = 800ma 450 mv switch leakage current output switch off, v sw = 36v 1 a oscillator frequency mic2570-1, -2; i sw = 100ma 20 khz maximum output voltage 36 v sync threshold voltage 0.7 v switch on-time 35 s currrent limit 1.1 a duty cycle v fb < v ref , i sw = 100ma 67 % general note: devices are esd protected; however, handling precautions are recommended. note 1: measured using comparator trip point. absolute maximum ratings supply voltage (v in ) ...................................................... 18v switch voltage (v sw ) .................................................... 36v switch current (i sw ) ........................................................ 1a sync voltage (v sync ) ...................................... C0.3v to 15v storage temperature (t a ) ......................... C65c to +150c soic power dissipation (p d ) .................................. 400mw operating ratings supply voltage (v in ) ..................................... +1.3v to +15v ambient operating temperature (t a ) ......... C40c to +85c junction temperature (t j ) ........................ C40c to +125c soic thermal resistance ( ja ) ............................ 140c/w
mic2570 micrel, inc. mic2570 4 august 2007 typical characteristics 0 0.5 1.0 1.5 2.0 0 0.2 0.4 0.6 0.8 1.0 switch current (a) switch voltage (v) switch saturation voltage t a = C4 0 c v in = 3. 0v 2. 5v 2. 0v 1. 5v 0 0.5 1.0 1.5 2.0 0 0.2 0.4 0.6 0.8 1.0 switch current (a) switch voltage (v) switch saturation voltage t a = 25 c v in = 3. 0v 2. 0v 2. 5v 1. 5v 0 0.5 1.0 1.5 2.0 0 0.2 0.4 0.6 0.8 1.0 switch current (a) switch voltage (v) switch saturation voltage t a = 85 c 1. 5v v in = 3. 0v 15 20 25 30 -60 -30 0 3 0 6 0 9 0 120 150 osc. frequency (khz) temperature (c) oscillator frequency vs. temperature v in = 2. 5v i s w = 100m a 50 55 60 65 70 75 -60 -30 0 3 0 6 0 9 0 120 150 duty cycle (%) temperature (c) oscillator duty cycle vs. temperature v in = 2. 5v i s w = 100m a 50 75 100 125 150 175 200 -60 -30 0 3 0 6 0 9 0 120 150 quiescent current (a) temperature (c) quiescent current vs. temperature v in = 2. 5v 0 2 4 6 8 10 -60 -30 0 3 0 6 0 9 0 120 150 feedback current (a) temperature (c) feedback current vs. temperature v in = 2. 5v mic 2570- 1 0 10 20 30 40 50 -60 -30 0 3 0 6 0 9 0 120 150 feedback current (na) temperature (c) feedback current vs. temperature v in = 2. 5v mic 2570-2 0 25 50 75 100 125 150 175 200 0 2 4 6 8 10 quiescent current (a) supply voltage (v) quiescent current vs. supply voltage C4 0 c +8 5 c +2 5 c 0 0.25 0.50 0.75 1.00 1.25 1.50 1.75 -60 -30 0 3 0 6 0 9 0 120 150 current limit (a) temperature (c) output current limit vs. temperature 0.01 0.1 1 10 100 1000 -60 -30 0 3 0 6 0 9 0 120 150 switch leakage current (na) temperature (c) switch leakage current vs. temperature 0 25 50 75 100 125 150 -60 -30 0 3 0 6 0 9 0 120 150 output hysteresis (mv) temperature (c) output hysteresis vs. temperature 2. 85v 3. 3v 5v
august 2007 5 mic2570 mic2570 micrel, inc. block diagrams oscillator 0.22v reference driver in v batt 2.85v gnd s w s y n c 3.3v 5v v ou t mic2570-1 selectable voltage version with external components oscillator 0.22v reference driver in v batt gnd s w s y n c mic2570-2 v ou t f b adjustable voltage version with external components
mic2570 micrel, inc. mic2570 6 august 2007 functional description the mic2570 switch-mode power supply (smps) is a gated oscillator architecture designed to operate from an input voltage as low as 1.3v and provide a high-ef?ciency ?xed or adjustable regulated output voltage. one advantage of this architecture is that the output switch is disabled whenever the output voltage is above the feedback comparator threshold thereby greatly reducing quiescent current and improving ef?ciency, especially at low output currents. refer to the block diagrams for the following discription of typical gated oscillator boost regulator function. the bandgap reference provides a constant 0.22v over a wide range of input voltage and junction temperature. the comparator senses the output voltage through an internal or external resistor divider and compares it to the bandgap reference voltage. when the voltage at the inverting input of the comparator is below 0.22v, the comparator output is high and the output of the oscillator is allowed to pass through the and gate to the output driver and output switch. the output switch then turns on and off storing energy in the inductor. when the output switch is on (low) energy is stored in the inductor; when the switch is off (high) the stored energy is dumped into the output capacitor which causes the output voltage to rise. when the output voltage is high enough to cause the compara - tor output to be low (inverting input voltage is above 0.22v) the and gate is disabled and the output switch remains off (high). the output switch remains disabled until the output voltage falls low enough to cause the comparator output to go high. there is about 6mv of hysteresis built into the comparator to prevent jitter about the switch point. due to the gain of the feedback resistor divider the voltage at v out experiences about 120mv of hysteresis for a 5v output. appications information oscillator duty cycle and frequency the oscillator duty cycle is set to 67% which is optimized to provide maximum load current for output voltages ap - proximately 3 larger than the input voltage. other output voltages are also easily generated but at a small cost in ef - ?ciency. the ?xed oscillator frequency (options -1 and -2) is set to 20khz. output waveforms the voltage waveform seen at the collector of the output switch (sw pin) is either a continuous value equal to v in or a switching waveform running at a frequency and duty cycle set by the oscillator. the continuous voltage equal to v in happens when the voltage at the output (v out ) is high enough to cause the comparator to disable the and gate. in this state the output switch is off and no switching of the inductor occurs. when v out drops low enough to cause the comparator output to change to the high state the output switch is driven by the oscillator. see figure 1 for typical voltage waveforms in a boost application. 5v 0v 5v 0ma i peak v in supply v oltag e inductor current output v oltag e t im e figure 1. typical boost regulator waveforms synchronization the sync pin is used to synchronize the mic2570 to an external oscillator or clock signal. this can reduce system noise by correlating switching noise with a known system frequency. when not in use, the sync pin should be grounded to prevent spurious circuit operation. a falling edge at the sync input triggers a one-shot pulse which resets the oscillator. it is possible to use the sync pin to generate oscillator duty cycles from approximately 20% up to the nominal duty cycle. current limit current limit for the mic2570 is internally set with a resis - tor. it functions by modifying the oscillator duty cycle and frequency. when current exceeds 1.2a, the duty cycle is reduced (switch on-time is reduced, off-time is unaffected) and the corresponding frequency is increased. in this way less time is available for the inductor current to build up while maintaining the same discharge time. the onset of current limit is soft rather than abrupt but suf?cient to protect the inductor and output switch from damage. certain combina - tions of input voltage, output voltage and load current can cause the inductor to go into a continuous mode of operation. this is what happens when the inductor current can not fall to zero and occurs when: duty cycle v out + v diode C v in v out + v diode C v s a t t im e inductor current current ratchet without current limit current limit threshold continuous current discontinuous current figure 2. current limit behavior
august 2007 7 mic2570 mic2570 micrel, inc. figure 2 shows an example of inductor current in the continu - ous mode with its associated change in oscillator frequency and duty cycle. this situation is most likely to occur with relatively small inductor values, large input voltage varia - tions and output voltages which are less than ~3 the input voltage. selection of an inductor with a saturation threshold above 1.2a will insure that the system can withstand these conditions. inductors, capacitors and diodes the importance of choosing correct inductors, capacitors and diodes can not be ignored. poor choices for these components can cause problems as severe as circuit failure or as subtle as poorer than expected ef?ciency. a. b. c. inductor current t im e figure 3. inductor current: a. normal, b. saturating, and c. excessive esr inductors inductors must be selected such that they do not saturate under maximum current conditions. when an inductor satu - rates, its effective inductance drops rapidly and the current can suddenly jump to very high and destructive values. figure 3 compares inductors with currents that are correct and unacceptable due to core saturation. the inductors have the same nominal inductance but figure 3b has a lower saturation threshold. another consideration in the selection of inductors is the radiated energy. in general, toroids have the best radiation characteristics while bobbins have the worst. some bobbins have caps or enclosures which signi?cantly reduce stray radiation. the last electrical characteristic of the inductor that must be considered is esr (equivalent series resistance). figure 3c shows the current waveform when esr is excessive. the normal symptom of excessive esr is reduced power transfer ef?ciency. capacitors it is important to select high-quality, low esr, ?lter capacitors for the output of the regulator circuit. high esr in the output capacitor causes excessive ripple due to the voltage drop across the esr. a triangular current pulse with a peak of 500ma into a 200m esr can cause 100mv of ripple at the output due the capacitor only. acceptable values of esr are typically in the 50m range. inexpensive aluminum electro - lytic capacitors usually are the worst choice while tantalum capacitors are typically better. figure 4 demonstrates the effect of capacitor esr on output ripple voltage. 4.75 5.00 5.25 0 500 1000 1500 output voltage (v) time (s) figure 4. output ripple output diode finally, the output diode must be selected to have adequate reverse breakdown voltage and low forward voltage at the application current. schottky diodes typically meet these requirements. standard silicon diodes have forward voltages which are too large except in extremely low power applications. they can also be very slow, especially those suited to power recti?cation such as the 1n400x series, which affects ef?ciency. inductor behavior the inductor is an energy storage and transfer device. its behavior (neglecting series resistance) is described by the following equation: i = v l t where: v = inductor voltage (v) l = inductor value (h) t = time (s) i = inductor current (a) if a voltage is applied across an inductor (initial current is zero) for a known time, the current ?owing through the inductor is a linear ramp starting at zero, reaching a maximum value at the end of the period. when the output switch is on, the voltage across the inductor is: v 1 = v in C v s a t when the output switch turns off, the voltage across the in - ductor changes sign and ?ies high in an attempt to maintain a constant current. the inductor voltage will eventually be clamped to a diode drop above v out . therefore, when the output switch is off, the voltage across the inductor is: v 2 = v out + v diode C v in for normal operation the inductor current is a triangular waveform which returns to zero current (discontinuous mode)
mic2570 micrel, inc. mic2570 8 august 2007 at each cycle. at the threshold between continuous and dis - continuous operation we can use the fact that i 1 = i 2 to get: v 1 t 1 = v 2 t 2 v 1 v 2 t 2 t 1 = this relationship is useful for ?nding the desired oscillator duty cycle based on input and output voltages. since input voltages typically vary widely over the life of the battery, care must be taken to consider the worst case voltage for each parameter. for example, the worst case for t 1 is when v in is at its minimum value and the worst case for t 2 is when v in is at its maximum value (assuming that v out , v diode and v sat do not change much). to select an inductor for a particular application, the worst case input and output conditions must be determined. based on the worst case output current we can estimate ef?ciency and therefore the required input current. remember that this is power conversion, so the worst case average input current will occur at maximum output current and minimum input voltage. a verage i in(max) = v out i out(max) v in(min) e f ficienc y referring to figure 1, it can be seen the peak input current will be twice the average input current. rearranging the inductor equation to solve for l: l = v i t 1 l = v in(min) 2 a verage i in(max) t 1 where t 1 = duty cycle f osc to illustrate the use of these equations a design example will be given: assume: mic2570-1 (?xed oscillator) v out = 5v i out(max) =50ma v in(min) = 1.8v ef?ciency = 75%. l = 1.8v 0.7 2 185.2m a 20kh z a verage i in(max) = 5v 50ma 1.8v 0.75 185.2ma l = 170h use the next lowest standard value of inductor and verify that it does not saturate at a current below about 400ma (< 2 185.2ma).
august 2007 9 mic2570 mic2570 micrel, inc. application examples gnd 5v s w mic2570 s y n c u1 m icrel mic2570-1bm c1 avx tpsd107m010r0100 tantalum, esr = 0.1? c2 avx tpse227m010r0100 tantalum, esr = 0.1? d1 motorola mbra140t3 l1 coilcraft do3316p-473, dcr = 0.12? 7 4 1 2 8 in c2 220f 10v v ou t 5v/100ma 2.0v to 3.1v 2 cells c1 100f 10v d1 mbra140 l1 47h u1 example 1. 5v/100ma regulator gnd 3.3v s w mic2570 s y n c u1 m icrel mic2570-1bm c1 avx tpsd107m010r0100 tantalum, esr = 0.1? c2 a vx tpse337m006r0100 tantalum, esr = 0.1? d1 motorola mbra140t3 l1 coilcraft do3316p-473, dcr = 0.12? 7 5 1 2 8 in c2 330f 6.3v v ou t 3.3v/150ma 2.0v to 3.1v 2 cells c1 100f 10v d1 mbra140 l1 47h u1 example 2. 3.3v/150ma regulator gnd f b s w mic2570 s y n c u1 m icrel mic2570-2bm c1 avx tpsd107m010r0100 tantalum, esr = 0.11? c2 avx tpse336m025r0300 tantalum, esr = 0.3? d1 motorola mbra140t3 l1 coilcraft do3316p-473, dcr = 0.12? 7 6 1 2 8 in c2 33f 25v v ou t 12v/40ma 2.0v to 3.1v 2 cells c1 100f 10v d1 mbra140 l1 47h r 2 1m 1% r 1 18.7k 1% v ou t = 0.22v ( 1+r2/r1) u1 example 3. 12v/40ma regulator gnd 3.3v s w mic2570 s y n c u1 m icrel mic2570-1bm c1 avx tpsd107m010r0100 tantalum, esr = 0.1? c2 avx tpsd107m010r0100 tantalum, esr = 0.1? c3 avx tpse337m006r0100 tantalum, esr = 0.1? d1 motorola mbra140t3 l1 coiltronics ctx50-4p dcr = 0.097? 7 5 1 2 8 in c3 330f 6.3v v ou t 3.3v/80ma 2.5v to 4.2v 1 li cell c1 100f 10v d1 mbra140 l1 50h l1 c2 100f 10v u1 1 2 3 4 example 4. single cell lithium to 3.3v/80ma regulator gnd f b s w mic2570 s y n c u1 micrel mic2570-2bm u2 micrel mic5203-5.0bm4 c1 avx tpsd107m010r0100 tantalum esr = 0.1? c2 avx tpse227m010r0300 tantalum esr = 0.1 ? c3 sprague 293d105x0016a2w tantalum d1 motorola mbra140t3 l1 coilcraft do3316p-473 dcr = 0.12? 7 6 1 2 8 in c1 100f 10v d1 l1 47h 2.0v to 3.1v 2 cells v ou t = 0.22v ( 1+r2/r1) u1 mbra140 c2 220f 10v mic5203 in e n gnd out v ou t 5v/80ma c3 1f 16v 1 2 3 4 r 1 20k 1% r 2 523k 1% 6v u2 example 5. low-noise 5v/80ma regulator
mic2570 micrel, inc. mic2570 10 august 2007 gnd f b s w mic2570 s y n c u1 micrel mic2570-2bm u2 micrel mic5203-3.3bm4 c1 avx tpsd107m010r0100 tantalum esr = 0.1? c2 avx tpse227m010r0100 tantalum esr = 0.1? c3 sprague 293d105x0016a2w tantalum d1 motorola mbra140t3 l1 coilcraft do3316p-473 dcr = 0.12? 7 6 1 2 8 in c1 100f 10v d1 l1 47h 2.0v to 3.1v 2 cells v ou t = 0.22v (1+r2/r1) u1 mbra140 c2 220f 10v mic5203 in e n gnd out v ou t 3.3v/80ma c3 1f 16v 1 2 3 4 r 1 20k 1% r 2 374k 1% u2 4.3v example 6. low-noise 3.3v/80ma regulator gnd 5v s w mic2570 s y n c u1 micrel mic2570-1bm c1 avx tpsd107m010r0100 tantalum, esr = 0.1? c2 avx tpse227m010r0100 tantalum, esr = 0.1? c3 avx tpse227m010r0100 tantalum, esr = 0.1? c4 avx tpse227m010r0100 tantalum, esr = 0.1? d1 motorola mbra140t3 d2 motorola mbra140t3 d3 motorola mbra140t3 l1 coilcraft do3316p-473, dcr = 1.2? 7 4 1 2 8 in c2 220f 10v +v ou t 5v/50ma 2.0v to 3.1v 2 cells c1 100f 16v d1 mbra140 l1 47h c3 220f 10v d2 mbra140 d3 mbra140 c4 220f 10v Cv ou t C4.5v to C5v/50ma C i ou t +i ou t u1 example 7. 5v/50ma regulator gnd f b s w mic2570 s y n c u1 micrel mic2570-2bm c1 avx tpsd107m010r0100, tantalum esr = 0.1? c2 avx tpse226m035r0300, tantalum esr = 0.3? c3 avx tpse226m035r0300, tantalum esr = 0.3? d1 motorola mbra140t3 d2 motorola mbra140t3 l1 coilcraft do3316p-473, dcr = 0.12? 7 6 1 2 8 in c3 0.1f c1 100f 10v d3 1n4148 l1 47h r 2 549k 1% r 1 4.99k 1% 2.0v to 3.1v 2 cells r 3 220k c2 22f 35v Cv ou t C24v/20ma d2 mbra140 d1 mbra140 c1 22f 35v C v ou t = C 0.22v ( 1+r2/r1) + 0.6v u1 example 8. C24v/20ma regulator
august 2007 11 mic2570 mic2570 micrel, inc. gnd f b s w mic2570 s y n c u1 micrel mic2570-2bm c1 sanyo 16mv330gx electrolytic esr = 0.1? c2 sanyo 35mv68gx electrolytic esr = 0.22? c3 sanyo 35mv68gx electrolytic esr = 0.22? c4 sanyo 63mv826x electrolytic esr = 0.34? d1 motorola 1n5819 d2 motorola 1n5819 d3 motorola 1n5819 l1 sumida rch106-470k dcr = 0.16? 7 6 1 2 8 in c1 330f 16v d1 l1 47h 2.0v to 3.1v 2 cell 1n5819 d2 1n5819 d3 1n5819 c3 68f 35v r 2 2.2m 1% r 1 10k 1% c4 82f 63v v ou t 50v/10ma c2 68f, 35v u1 v ou t = 0.22 ( 1+r2/r1) example 9. voltage doubler gnd f b s w mic2570 s y n c u1 micrel mic2570-2bm c1 avx tpsd107m010r0100 tantalum esr = 0.1? c2 avx tpse227m010r0100 tantalum esr = 0.1? d1 motorola mbra140t3 l1 coilcraft do3316p-473 dcr = 0.12? 7 6 1 2 8 in c2 220f 10v 2.0v to 3.1v 2 cell c1 100f 10v d1 mbra140 l1 47h r 1 11k 1% i = 0.22v/r1 d2 l e d x5 i l e d u1 example 10. constant-current led supply enable shutdown gnd f b s w mic2570 s y n c u1 micrel mic2570-2bm c1 avx tpsd107m010r0100 tantalum esr = 0.1? c2 avx tpse227m010r0100 tantalum esr = 0.1? d1 motorola mbra140t3 l1 coilcraft do3316p-473 dcr = 0.12? 7 6 1 2 8 in c1 100f 10v d1 l1 47h 2.0v to 3.1v 2 cell v ou t = 0.22v (1+r2/r1) mbra140 c2 220f 10v r 1 20k 1% r 2 434k 1% d2 1n4148 74c04 v ou t 5v/100ma u1 r 3 100k example 11. 5v/100ma regulator with shutdown
mic2570 micrel, inc. mic2570 12 august 2007 gnd f b s w mic2570 s y n c u1 micrel m ic2570-2bm c1 avx tpsd107m010r0100 tantalum esr = 0.1? c2 avx tpse227m010r0100 tantalum esr = 0.1? c3 avx tpse227m010r0100 tantalum esr = 0.1? d1 motorola mbra140t3 l1 coilcraft do3316p-473 dcr = 0.12? q1 zetex ztx7888 7 6 1 2 8 in c1 100f 10v d1 l1 47h 2.0v to 3.1v 2 cell v ou t = 0.22v (1+r2/r1) mbra140 c3 220f 10v r 1 20k 1% r 2 434k 1% d2 1n4148 74c04 v ou t 5v/100ma c2 220f 10v r 1 510? enable shutdown q1 ztx7888 u1 r 3 100k example 12. 5v/100ma regulator with shutdown and output disconnect gnd 5v s w mic2570 s y n c u1 micrel mic2570-1bm c1 avx tpsd107m010r0100 tantalum esr = 0.1? c2 avx tpse227m010r0100 tantalum esr = 0.1? d1 motorola mbra140t3 d2 motorola mbrs130l l1 coilcraft do3316p-473 dcr = 0.12? 7 4 1 2 8 in c2 220f 10v v ou t 5v/70ma 2.0v to 3.1v 2 cell c1 100f 10v d1 mbra140 l1 47h d2 mbrs130l u1 example 13. reversed-battery protected regulator gnd 5v s w mic2570 s y n c u1 micrel mic2570-1bm c1 avx tpsd107m010r0100 tantalum esr = 0.1? c2 avx tpse227m010r0100 tantalum esr = 0.1? d1 motorola mbra140t3 d2 motorola mbrs130lt3 d3 motorola mbrs130lt3 l1 coilcraft do3316p-473 dcr = 0.12 q1 siliconix si9434 pmos 7 4 1 2 8 in c2 220f 10v v ou t 5v/100ma c1 100f 10v d1 mbra140 l1 47h d3 1n4148 d2 1n4148 c3 0.1f 2.0v to 3.1v 2 cell r 1 100k c4 0.1f q1 si9434 u1 body diode example 14. improved reversed-battery protected regulator
august 2007 13 mic2570 mic2570 micrel, inc. component cross reference capacitors avx sprague sanyo sanyo surface mount surface mount through hole through hole (tantalum) (tantalum) (os-con) (al electrolytic) 330f/6.3v tpse337m006r0100 593d337x06r3e2w 10sa220m 16mv330gx (330f/16v) 220f/10v tpse227m010r0100 593d227x0010e2w 10sa220m 16mv330gx (330f/16v) 100f/10v tpsd107m010r0100 593d107x0010d2w 10sa100m 16mv330gx (330f/16v) 33f/25v tpse336m025r0300 593d336x0025e2w 35mv68gx (68f/35v) 22f/35v tpse226m035r0300 593d226x0035e2w 35mv68gx (68f/35v) diodes motorola gi ir motorola surface mount surface mount surface mount through hole (schottky) (schottky) (schottky) (schottky) 1a/40v mbra140t3 ss14 10mq40 1n5819 1a/20v 1n5817 inductors coilcraft coiltronics sumida sumida surface mount surface mount surface mount through hole (button cores) (torriod) (button cores) (button cores) 22h do3308p-223 47h do3316p-473 cd75-470lc rch-106-470k 50h ctx50-4p suggested manufacturers list inductors capacitors diodes transistors coilcraft avx corp. general instruments (gi) siliconix 1102 silver lake rd. 801 17th ave. south 10 melville park rd. 2201 laurelwood rd. cary, il 60013 myrtle beach, sc 29577 melville, ny 11747 santa clara, ca 96056 tel: (708) 639-2361 tel: (803) 448-9411 tel: (516) 847-3222 tel: (800) 554-5565 fax: (708) 639-1469 fax: (803) 448-1943 fax: (516) 847-3150 coiltronics sanyo video components corp. international recti?er corp. zetex 6000 park of commerce blvd. 2001 sanyo ave. 233 kansas st. 87 modular ave. boca raton, fl 33487 san diego, ca 92173 el segundo, ca 90245 commack, ny 11725 tel: (407) 241-7876 tel: (619) 661-6835 tel: (310) 322-3331 tel: (516) 543-7100 fax: (407) 241-9339 fax: (619) 661-1055 fax: (310) 322-3332 sumida sprague electric motorola inc. suite 209 lower main st. ms 56-126 637 e. golf road 60005 sanford, me 04073 3102 north 56th st. arlington heights, il tel: (207) 324-4140 phoenix, az 85018 tel: (708) 956-0666 tel: (602) 244-3576 fax: (708) 956-0702 fax: (602) 244-4015
mic2570 micrel, inc. mic2570 14 august 2007 component side and silk screen (not actual size) solder side and silk screen (not actual size) evaluation board layout
august 2007 15 mic2570 mic2570 micrel, inc. package information 45 0 C8 0.244 (6.20) 0.228 (5.79) 0.197 (5.0) 0.189 (4.8) se a ting plane 0.026 (0.65) max ) 0.010 (0.25) 0.007 (0.18) 0.064 (1.63) 0.045 (1.14) 0.0098 (0.249) 0.0040 (0.102) 0.020 (0.51) 0.013 (0.33) 0.157 (3.99) 0.150 (3.81) 0.050 (1.27) typ pin 1 dimensions: inches (mm) 0.050 (1.27) 0.016 (0.40) 8-pin soic (m) micrel inc. 2180 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 web http://www.micrel.com this information furnished by micrel reserves the right to change circuitry and speci?cations at any time without noti?cation to the customer. micrel products are noth reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a signi? cant injury to the user. a purchaser's use or sale of micrel pro micrel for any damages resulting from such use or sale. ? 2005 micrel, inc.

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