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MP1527
2A, 1.3MHz Step-Up Converter
Monolithic Power Systems
General Description
The MP1527 is a 2A, fixed frequency step-up converter in a tiny 16 lead QFN package. The high 1.3MHz switching frequency allows for smaller external components producing a compact solution for medium-to-high current step-up, flyback, and SEPIC applications. The MP1527 regulates the output voltage up to 25V at efficiency as high as 93%. Soft-start, timer-latch fault circuitry, cycle-by-cycle current limiting, and input undervoltage lockout prevent overstressing or damage to external circuitry at startup and output short-circuit conditions. Fixed frequency operation eases control of noise making the MP1527 optimal for noise sensitive applications such as mobile handsets and wireless LAN PC cards. Current-mode regulation and external compensation components allow the MP1527 control loop to be optimized over wide variety of input voltage, output voltage and load current conditions. The MP1527 is offered in a tiny 4mm x 4mm 16 lead QFN and 14 lead TSSOP packages.
Features
2A Peak Current Limit Internal 150m Power Switch VIN Range of 2.6V to 25V >93% Efficiency Zero Current Shutdown Mode Under Voltage Lockout Protection Timer-Latch Fault Detection Soft Start Operation Thermal Shutdown Tiny 4mm x 4mm 16 pin QFN Package Evaluation Board Available
Applications
SOHO Routers, PCMCIA Cards, Mini PCI Handheld Computers, PDAs Cell Phones, Digital and Video Cameras Small LCD Display
Ordering Information
Part Number
MP1527DR MP1527DM EV0034
Package
QFN16 (4x4) TSSOP14
Temperature
-40 to +85C
-40 to +85C MP1527DR Evaluation Board
For Tape & Reel, add suffix -Z (e.g. MP1527DR-Z) For Lead Free, add suffix -LF (e.g. MP1527DR-LF-Z)
Figure 1: Typical Application Circuit
V IN = 2.6V to 25V
IN
FAULT ON/OFF
FAULT E N SS B P
SW
VOUT = 3.3V to 25V
FB COMP
SGND
PGND
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Monolithic Power Systems, Inc.
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MP1527
2A, 1.3MHz Step-Up Converter
Monolithic Power Systems
Absolute Maximum Ratings
Input Supply Voltage VIN SW Pin Voltage VSW Voltage at All Other Pins Storage Temperature
(Note 1)
Recommended Operating Conditions
IN Input Supply Voltage VIN Step Up Output Voltage Operating Temperature 2.6V to 25V 3.3V to 25V -40C to +85C 90C/W 46C/W
-0.3V to 27V -0.3V to 27V -0.3V to 6V -55C to +150C
Package Thermal Characteristics
Thermal Resistance JA (TSSOP14) Thermal Resistance JA (QFN16) (Note 2)
Electrical Characteristics (VIN = 5.0V, TA = 25C unless specified otherwise) Parameters
IN Shutdown Supply Current IN Operating Supply Current BP Output Voltage IN Undervoltage Lockout Threshold IN Undervoltage Lockout Hysteresis EN Input Low Voltage EN Input High Voltage EN Input Hysteresis EN Input Bias Current SW Switching Frequency SW Maximum Duty Cycle Error Amplifier Voltage Gain Error Amplifier Transconductance COMP Maximum Output Current FB Regulation Threshold FB Input Bias Current SS Charging Current FAULT Input Threshold Voltage FAULT Output Low Voltage SW On Resistance SW Current Limit SW Leakage Current Thermal Shutdown VFB < 1.0V VIN =5V VIN =3V (Note 3) VSW = 25V
Conditions
VEN<0.3V VEN>2V, VFB=1.1V VIN = 2.6V to 25V VIN Rising
Min
Typ
0.5 0.9 2.4
Max
1.0 1.2 2.4
Units
A mA V V mV V V mV nA MHz % V/V A/V A V nA A V V m m A A C
2.1 100 1.5 1.0 85 100 100 1.3 90 400 300 30 1.22 -100 2 1.2 0.2 150 225 3.0 0.5 160
0.3
1.5
VFB = 1.1V
Sourcing and Sinking 1.196 VFB=1.22V During Soft-Start
1.244
2.0
Note 1: Exceeding these ratings may damage the device. Note 2: Measured on approximately 1" square of 1oz copper. Note 3: Guaranteed by design. Not tested.
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MP1527
2A, 1.3MHz Step-Up Converter
Monolithic Power Systems
Pin Descriptions
FAULT
14
NC NC IN SW PGND SGND FAULT
1 2 3 4 5 6 7
14 13 12 11 10 9 8
SGND EN BP NC COMP FB SS
16
15
COMP NC BP EN
1 2 3 5 4
13 12
SGND PGND PGND SW SW
11 10 8 9
6
SS
FB
Top View
7
SGND
NC
Table 1: Pin Description
QFN Pin 1 2, 6, 7 3 4 5, 13 8 9, 10 11, 12 TSSOP Pin 10 1, 2, 11 12 13 6, 14 3 4 5 Name Function Compensation Node. COMP is the output of the internal transconductance error amplifier. Connect a series RC network from COMP to SGND to compensate the regulator control loop. No Connect Output of the internal 2.4V low dropout regulator. Connect a 10nF bypass capacitor between BP and SGND. Do not apply an external load to BP. Regulator On/Off Control Input. A logic high input (VEN>1.5V) turns on the regulator, a logic low puts the MP1527 into low current shutdown mode. Signal Ground Input Supply Output Switching Node. SW is the drain of the internal n-channel MOSFET. Connect the inductor and rectifier to SW to complete the step-up converter. Power Ground Fault Input/Output. FAULT is an Input/Output that indicates that the MP1527 detected a fault and shuts the regulator off once a fault is indicated. Connect the FAULT input/outputs together for all MP1527 regulators to force all regulators off when any one regulator detects a fault. Once a fault is detected, cycle EN or the input power to restart the regulator. Pull FAULT to the input voltage through a 100k resistor. Up to 20 FAULT input/outputs can be connected in parallel. Soft-Start Input. Connect a 10nF to 22nF capacitor from SS to SGND to set the soft-start and fault timer periods. SS sources 2A to an external soft-start capacitor during start-up and when a fault is detected. As the voltage at SS increases to 1.2V, the voltage at COMP is clamped to 0.7V above the voltage at SS limiting the startup current. Under a fault condition, SS ramps at the same rate as in soft-start. When the voltage at SS reaches 1.2V, FAULT is asserted and the regulator is disabled. The external capacitor at SS is discharged to ground when not in use or when under voltage lockout or thermal shutdown occurs. Regulation Feedback Input. Connect to external resistive voltage divider from the output voltage to FB to set output voltage.
COMP NC BP EN SGND IN SW PGND
14
7
FAULT
15
8
SS
16
9
FB
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Monolithic Power Systems, Inc.
NC
IN
3
MP1527
2A, 1.3MHz Step-Up Converter
Monolithic Power Systems
Typical Operating Characteristics (Circuit of Figure 9: Unless Otherwise Specified)
Figure 2: MP1527 responding to FAULT being driven low Figure 3: MP1527 responding to an overload
VOUT
VOUT
VSS
VSS VFAULT
VFAULT
Figure 4: MP1527 starting from EN being driven low-to-high
Figure 5: Transient Load Response. Load driven from 50mA to 500mA
VOUT
VOUT
VSS VEN IIN (500mA/Div)
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MP1527
2A, 1.3MHz Step-Up Converter
Monolithic Power Systems
Figure 6: Quiescent Current versus Input Voltage (Bootstrapped)
1000 900 800 Quiescent Current (uA) 700 600 500 400 300 200 100 0 0 5 10 15 20 25 Input Voltage (V)
Figure 7: Efficiency vs. Load Current (Bootstrapped)
100.00% 95.00% 90.00% 85.00% Efficiency 80.00% 75.00% 70.00% 65.00% 60.00% 55.00% 50.00% 10 100 Load Current (mA) 1000
VOUT=12V VIN=3.3V VIN=5V VIN=8V
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MP1527
2A, 1.3MHz Step-Up Converter
Monolithic Power Systems
Figure 8: Efficiency vs. Load Current (Non-Bootstrapped)
100.00% 95.00% 90.00% 85.00% Efficiency 80.00% 75.00% 70.00% 65.00% 60.00% 55.00% 50.00% 10 100 Load Current (mA) 1000 VOUT = 12V VIN=3.3V VIN=5V VIN=8V
Figure 9: VIN = 5V, VOUT = 12V @ 500mA Load
VIN = 5V
10F 100K IN 4.7H
Figure 10: Driving Multiple Strings of White LEDs
V IN = 2.6 to 25V 4.7F
1N5819HW
S W M BR0530 91K F B CM OP R 3 10K C 3 5.6nF C 4 N/A C 2 10F
FAU LT O /O N FF
10nF 10nF
FAULT E N S S B P
VOUT = 12 V @0.5A
1F
100K
1F
IN
SW
Up to 6 LEDs per String
FAULT ON/OFF
FA ULT F B E N SS B P SGND 10nF 10nF
10K
MP1527
COMP 5.6K PGND 4.7nF 60 60 60
SN GD
PN GD
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MP1527
2A, 1.3MHz Step-Up Converter
Monolithic Power Systems
Figure 11: Functional Block Diagram
IN BP EN
OSCILLATOR
2.4V
LDO
VDD
PWM CONTROL LOGIC
SW
2A
CURRENT SENSE AMP
SS
1.098V
PGND SOFTSTART & FAULT CONTROL
FAULT
GM
1.22V
FB
COMP
SGND
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MP1527
2A, 1.3MHz Step-Up Converter
Monolithic Power Systems
Functional Description
The MP1527 uses a 1.3MHz fixed-frequency, current-mode regulation architecture to regulate the output voltage. The MP1527 measures the output voltage through an external resistive voltage divider and compares that to the internal 1.22V reference to generate the error voltage at COMP. The current-mode regulator compares voltage at the COMP pin to the inductor current to regulate the output voltage. The use of current-mode regulation improves transient response and control loop stability. At the beginning of each cycle, the n-channel MOSFET switch is turned on, forcing the inductor current to rise. The current at the source of the switch is internally measured and converted to a voltage by the current sense amplifier. That voltage is compared to the error voltage at COMP. When the inductor current rises sufficiently, the PWM comparator turns off the switch forcing the inductor current to the output capacitor through the external rectifier. This forces the inductor current to decrease. The peak inductor current is controlled by the voltage at COMP, which in turn is controlled by the output voltage. Thus the output voltage controls the inductor current to satisfy the load. voltage at startup due to input current overshoot at startup. When power is applied to the MP1527, or with power applied when enable is asserted, a 2A internal current source charges the external capacitor at SS. As the capacitor charges, the voltage at SS rises. The MP1527 internally clamps the voltage at COMP to 0.7V above the voltage at SS. This limits the inductor current at start-up, forcing the input current to rise slowly to the current required to regulate the output voltage during soft-start. The soft-start period is determined by the equation: tSS = 2.75 *105 * CSS Where CSS (in F) is the soft-start capacitor from SS to SGND, and tSS (in seconds) is the softstart period. Determine the capacitor required for a given soft-start period by the equation: CSS = 3.64 *10-6 * tSS Use values for CSS between 10nF and 22nF to set the soft-start period.
Fault Timer-Latch Function
The MP1527 includes an output fault detector and timer-latch circuitry to disable the regulator in the event of an undervoltage, overcurrent, or thermal overload. Once the soft-start is complete, the fault comparator monitors the voltage at FB. If the voltage falls below the 1.098V fault threshold, the capacitor at SS charges through an internal 2A current source. If the fault condition remains long enough for the capacitor at SS to charge to 1.2V, the FAULT output is pulled low and the power switch is turned off, disabling the output.
Internal Low-Dropout Regulator
The internal power to the MP1527 is supplied from the input voltage (IN) through an internal 2.4V low-dropout linear regulator, whose output is BP. Bypass BP to SGND with a 10nF or greater capacitor to insure the MP1527 operates properly. The internal regulator can not supply any more current than is required to operate the MP1527, therefore do not apply any external load to BP.
Soft-Start
The MP1527 includes a soft-start timer that limits the voltage at COMP during start-up to prevent excessive current at the input. This prevents premature termination of the source
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Monolithic Power Systems, Inc.
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MP1527
2A, 1.3MHz Step-Up Converter
Monolithic Power Systems
The fault time-out period is determined by the equation: tFAULT = 6*105 * CSS If multiple MP1527 regulators are used in the same circuit, the FAULT input/outputs can be connected together. Should any one regulator indicate a fault, it pulls all FAULT input/outputs low, disabling all regulators. This insures that all outputs are disabled should any one output detect a fault. Pull-up FAULT to the input voltage (IN) through a 100K resistor. The leakage current at FAULT is less than 250nA, so up to 20 FAULT input/outputs can be connected together through a single 100K pull-up resistor. To reduce current draw when FAULT is active, a higher value pull-up resistor may be used. Calculate the pull-up resistor value by the equation: 100k RPULL-UP 2M / N Where N is the number of FAULT input/outputs connected together. minimum. Ceramic capacitors are preferred, but tantalum or low-ESR electrolytic capacitors may also suffice. Use an input capacitor value greater than 4.7F. The capacitor can be electrolytic, tantalum or ceramic. However since it absorbs the input switching current it requires an adequate ripple current rating. Use a capacitor with RMS current rating greater than the inductor ripple current (see Selecting The Inductor to determine the inductor ripple current). To insure stable operation place the input capacitor as close to the IC as possible. Alternately a smaller high quality ceramic 0.1F capacitor may be placed closer to the IC with the larger capacitor placed further away. If using this technique, it is recommended that the larger capacitor be a tantalum or electrolytic type. All ceramic capacitors should be placed close to the MP1527.
Selecting the Output Capacitor
The output capacitor is required to maintain the DC output voltage. Low ESR capacitors are preferred to keep the output voltage ripple to a minimum. The characteristic of the output capacitor also affects the stability of the regulation control system. Ceramic, tantalum, or low ESR electrolytic capacitors are recommended. In the case of ceramic capacitors, the impedance of the capacitor at the switching frequency is dominated by the capacitance, and so the output voltage ripple is mostly independent of the ESR. The output voltage ripple is estimated to be:
VRIPPLE V 1 - IN x ILOAD V OUT C2 x f SW
Setting the Output Voltage
Set the output voltage by selecting the resistive voltage divider ratio. The voltage divider drops the output voltage to the 1.22V feedback threshold voltage. Use 10K for the low-side resistor of the voltage divider. Determine the high side resistor by the equation: RH = (VOUT - VFB) / (VFB / RL) where RH is the high-side resistor, RL is the low-side resistor, VOUT is the output voltage and VFB is the feedback regulation threshold. For RL = 10K and VFB = 1.22V, then RH (K) = 8.20* (VOUT - 1.22V)
Selecting the Input Capacitor
An input capacitor is required to supply the AC ripple current to the inductor, while limiting noise at the input source. A low ESR capacitor is required to keep the noise at the IC to a
MP1527 Rev 1.8_8/31/05
Where VRIPPLE is the output ripple voltage, VIN and VOUT are the DC input and output voltages respectively, ILOAD is the load current, fSW is the switching frequency, and C2 is the capacitance of the output capacitor. In the case of tantalum or low-ESR electrolytic capacitors, the ESR dominates the impedance
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Monolithic Power Systems, Inc.
MP1527
2A, 1.3MHz Step-Up Converter
Monolithic Power Systems
at the switching frequency, and so the output ripple is calculated as:
VRIPPLE V (1 - IN ) x ILOAD VOUT I x R ESR x VOUT + LOAD C2 x f SW VIN
Selecting the Diode
The output rectifier diode supplies current to the inductor when the internal MOSFET is off. To reduce losses due to diode forward voltage and recovery time, use a Schottky diode with the MP1527. The diode should be rated for a reverse voltage equal to or greater than the output voltage used. The average current rating must be greater than the maximum load current expected, and the peak current rating must be greater than the peak inductor current.
Where RESR is the equivalent series resistance of the output capacitors. Choose an output capacitor to satisfy the output ripple and load transient requirements of the design. A 4.7F-22F ceramic capacitor is suitable for most applications.
Compensation
The output of the transconductance error amplifier (COMP) is used to compensate the regulation control system. The system uses two poles and one zero to stabilize the control loop. The poles are fP1 set by the output capacitor and load resistance and fP2 set by the compensation capacitor C3. The zero fZ1 is set by the compensation capacitor C3 and the compensation resistor R3. These are determined by the equations: fP1 = 1 / (*C2*RLOAD) fP2 = GEA / (2*AVEA*C3) fZ1 = 1 / (2*C3*R3) Where RLOAD is the load resistance, GEA is the error amplifier transconductance, and AVEA is the error amplifier voltage gain. The DC loop gain is:
AVDC = AVEA*GCS*(VIN / VOUT)*RLOAD*(VFB / VOUT)
Selecting the Inductor
The inductor is required to force the higher output voltage while being driven by the input voltage. A larger value inductor results in less ripple current that results in lower peak inductor current, reducing stress on the internal n-channel.switch. However, the larger value inductor has a larger physical size, higher series resistance, and/or lower saturation current. A 4.7H inductor is recommended for most applications. However, a more exact inductance value can be calculated. A good rule of thumb is to allow the peak-to-peak ripple current to be approximately 30-50% of the maximum input current. Make sure that the peak inductor current is below 75% of the current limit at the operating duty cycle to prevent loss of regulation due to the current limit. Also make sure that the inductor does not saturate under the worst-case load transient and startup conditions. Calculate the required inductance value by the equation:
V x (VOUT - VIN ) L = IN VOUT x f SW x I
IIN(MAX ) =
VOUT x ILOAD (MAX )
or AVDC = AVEA*GCS*VIN*VFB*RLOAD /(VOUT)2 Where GCS is the current sense gain, VIN is the input voltage, VFB is the feedback regulation threshold, and VOUT is the regulated output voltage.
VIN x I = (30% - 50%)IIN(MAX )
Where ILOAD(MAX) is the maximum load current, I is the peak-to-peak inductor ripple current, and is efficiency.
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MP1527
2A, 1.3MHz Step-Up Converter
Monolithic Power Systems
There is also a right-half-plane zero (fRHPZ) that exists in all continuous mode (continuous mode means that the inductor current does not drop to zero on each cycle) step-up converters. The frequency of the right half plane zero is: fRHPZ = VIN2*RLOAD / (2*L*VOUT2) where L is the value of the inductor. To stabilize the regulation control loop, the crossover frequency (The frequency where the loop gain drop to 0dB or gain of 1, indicated as fC) should be at least one decade below the right-half-plane zero and should be at most 75KHz. fRHPZ is at its lowest frequency at maximum output load current (RLOAD is at a minimum) The crossover frequency is calculated by the equation: fC = AVDC*fP1*fP2 / fZ1 or fC = GCS*GEA*VIN*VFB*R3 / (2*C2*VOUT2) The known values are: GCS = 4.3S GEA = 400S VFB = 1.22V Putting in the known constants: fC = 3.3x10 *VIN *R3/
-4
R3 = VIN*RLOAD-MIN*C2 / (10GCS*GEA*VFB*L) The minimum load resistance (RLOAD-MIN) is equal to the regulated output voltage (VOUT) divided by the maximum load current ILOAD-MAX. Substituting that into the above equation:
R3 = VIN*VOUT*C2 /(10GCS*GEA *VFB*L*ILOAD-MAX)
Putting in the known constant values:
(1) R3 48*VIN*VOUT*C2 / (L*ILOAD-MAX)
For fC = 75KHz,
fC = (GCS*GEA*VIN*VFB*R3) / (2*C2*VOUT2)
Solving for R3,
R3 = (2*fC*C2*VOUT2 / (GCS*GEA*VIN*VFB)
Using 75KHz for fC and putting in the other known constants: (2) R3 2.2x108*C2*VOUT2 / VIN The value of the compensation resistor is limited to 10K to prevent overshoot on the output at turn-on. So if the value calculated for R3 from either equation (1) or equation (2) is greater than 10k, use 10K for R3. Choose C3 to set the zero frequency fZ1 to one-fourth of the crossover frequency fC: fZ1 = fC / 4 or
1 /(2*C3*R3) = GCS*GEA*VIN*VFB*R3 / (8*C2*VOUT2)
(C2*VOUT2)
If the frequency of the right-half-pane zero fRHPZ is less than 750KHz, then the crossover frequency should be 1/10 of fRHPZ, and determine the compensation resistor (R3) with equation (1). If fRHPZ is greater than or equal to 750KHz, set the crossover frequency to 75KHz with equation (2). For fC = fRHPZ / 10, then
MP1527 Rev 1.8_8/31/05
Solving for C3:
C3 = 4*C2*VOUT2 / (GCS*GEA*VIN*VFB*R32)
Entering the known values gives:
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Monolithic Power Systems, Inc.
MP1527
2A, 1.3MHz Step-Up Converter
Monolithic Power Systems
C3 1.9x103 C2 VOUT2 / (VIN R32) In some cases, if an output capacitor with high capacitance and high equivalent series resistance (ESR) is used, then a second compensation capacitor (from COMP to SGND) is required to compensate for the zero introduced by the output capacitor ESR. The extra capacitor is required if the ESR zero is less than 4x the crossover frequency. The ESR zero frequency is: fZESR = 1 / (2*C2*RESR) The second compensation capacitor required if: 4*fC fZESR or
4*GCS*GEA*VIN*VFB*R3 (2*C2*RESR) / (2*C2*VOUT2) 1 /
Example
Given: Input Voltage (VIN): 5V Output Voltage (VOUT): 12V Maximum Load Current (ILOAD-MAX): 500mA Output Capacitor (C2): 10F (ESR=10m Maximum) Inductor Value (L): 4.7H Find the frequency of the right-half-plane zero: fRHPZ = VIN2 / (2*L*VOUT*ILOAD-MAX) fRHPZ = (5V)2 / (2*4.7H*12V*500mA)=141KHz The frequency of the right-half-plane zero is less than 750khz, so use equation (1) to determine the compensation resistor R3:
R3 48*VIN*VOUT*C2 / (L*ILOAD-MAX) R3 48*5*12*10F/(4.7H*500mA) =12.3K
is
Simplifying: (8.4x10-3*VIN*R3*RESR )/ VOUT2 1 If this is the case, calculate the second compensation capacitor by the equation: R3*C4 = C2*RESR or C4 = (C2*RESR) / R3
(use 10K) Find the compensation capacitor C3:
C3 1.9x103*C2*VOUT2 / (VIN*R32) C3 1.9x103*10F (12V)2 / (5 * 10K2) = 5.4nF
(use the nearest standard value, 5.6nF) Determine if the second capacitor is required: compensation
8.4x10-3 * 5V * 5.6K * 10m / 12V2 = 0.016 1
Therefore no second compensation capacitor is required.
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Monolithic Power Systems, Inc.
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MP1527
2A, 1.3MHz Step-Up Converter
Monolithic Power Systems
Packaging
QFN16 (4x4)
Pin 1 Dot By marking 3.950 (0.156) 4.050 (0.159) 0.550 (0.217) 0.650 (0.256)
13
2.35 (0.093) 2.45 (0.097)
16
Pin 1 Identification
1
3.950 (0.156) 4.050 (0.159)
QFN 16L (4 X 4mm)
0.40 (0.0158) 0.50 (0.0197)
0.650 BSC
R0.030Max.
9 4
0.28 (0.011) 0.38 (0.015)
8
5
Top View
2.280 (0.898) Ref.
Btm View
Side View
0.850 ( 0.0335) 0.950 (0.0374) 0.000-0.025 0.178 (0.007) 0.228 (0.009)
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Monolithic Power Systems, Inc.
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MP1527
2A, 1.3MHz Step-Up Converter
Monolithic Power Systems
TSSOP14
NOTICE: MPS believes the information in this document to be accurate and reliable. However, it is subject to change without notice. Please contact the factory for current specifications. No responsibility is assumed by MPS for its use or fit to any application, nor for infringement of patent or other rights of third parties.
MP1527 Rev 1.8 8/31/05 (c) 2003 MPS, Inc. Monolithic Power Systems, Inc. 983 University Ave, Building A, Los Gatos, CA 95032 USA Tel: 408-357-6600 Fax: 408-357-6601 Web: www.monolithicpower.com 14

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