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MIC2225
2MHz 600mA Synchronous Buck Regulator with 300mA LDO
General Description
The Micrel MIC2225 is a dual output regulator featuring a high efficiency 2MHz PWM synchronous buck (step-down) regulator and a 300mA LDO. The MIC2225 is an ultra-low noise, small size, and high efficiency solution for portable power applications, providing core and I/O supply rails for applications like application processors, camera DSPs and multimedia chipsets. In PWM mode, the MIC2225 operates with a constant 2MHz frequency. The MIC2225 switching regulator operates from 2.7V to 5.5V input and features internal power MOSFETs that can supply up to 600mA output current in PWM mode. The MIC2225 is available in the 10-pin 2mm x 2mm Thin MLF(R) package with a junction operating range from -40C to +125C. Data sheets and support documentation can be found on Micrel's web site at: www.micrel.com.
Features
DC-DC Converter * 2.7 to 5.5V supply voltage * 2MHz PWM mode * Output current to 600mA * >95% efficiency * 100% maximum duty cycle * Fixed output voltage option down to 1V * Ultra-fast transient response * Stable with 2.2F ceramic output capacitor * Fully integrated MOSFET switches * Micropower shutdown (1mA in shutdown) * Thermal shutdown and current limit protection * Pb-free 10-pin 2mm x 2mm Thin MLF(R) package * -40C to +125C junction temperature range LDO * VIN range 2.7V to 5.5V * 300mA output current * Output voltage down to 0.8V * Thermal shutdown protection * Current limit protection
Applications
* Cellular phones * PDAs * USB peripherals ___________________________________________________________________________________________________________
Typical Application
1.8V Efficiency @ 25C
100 90 80 70 60 50 40 30 20 10 0 0 3.6VIN 2.7VIN
5.5VIN
0.1 0.2 0.3 0.4 0.5 LOAD CURRENT (A)
0.6
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
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Micrel, Inc.
MIC2225
Ordering Information
Part Number MIC2225-4MYMT MIC2225-4SYMT MIC2225-G4YMT MIC2225-GFYMT
Note: 1. For other voltages available. Contact Micrel Marketing for details.
Voltage 1.2V/2.8V 1.2V/3.3V 1.8V/1.2V 1.8V/1.5V
Temperature Range -40 to +125C -40 to +125C -40 to +125C -40 to +125C
Package 10-Pin 2x2 Thin MLF(R) 10-Pin 2x2 Thin MLF 10-Pin 2x2 Thin MLF
(R) (R)
Lead Finish Pb-Free Pb-Free Pb-Free Pb-Free
10-Pin 2x2 Thin MLF(R)
Pin Configuration
AGND LDO BIAS AVIN FB 1 2 3 4 5 10 PGND 9 8 7 6 SW VIN ENLDO EN
10-Pin 2mm x 2mm Thin MLF(R) (MT)
Pin Description
Pin Number 1 2 3 4 5 Pin Name AGND LDO BIAS AVIN FB Pin Function Analog (signal) Ground. LDO Output (Output): Connect to a 2.2F output capacitor. Internal circuit bias supply. Must be de-coupled to signal ground with a 0.1F capacitor and should not be loaded. Analog Supply Voltage (Input): Supply voltage for the analog control circuitry and LDO input power. Requires bypass capacitor to GND. Feedback. Input to the error amplifier. For the Adjustable option, connect to the external resistor divider network to set the output voltage. For fixed output voltage options, connect to VOUT and an internal resistor network sets the output voltage. Enable (Input). Logic low will shut down the switching regulator reducing the quiescent current to less than 5A. Enable LDO (Input): Logic low will shut down the LDO, reducing the quiescent current to less than 5A. Supply Voltage (Input): Supply voltage for the internal switches and drivers. Switch (Output): Internal power MOSFET output switches. Power Ground.
6 7 8 9 10
EN ENLDO VIN SW PGND
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Absolute Maximum Ratings(1)
Supply Voltage (VIN) .......................................................+6V Output Switch Voltage (VSW) ..........................................+6V Output Switch Current (ISW)..............................................1A Logic Input Voltage (VEN,VLOWQ)........................ -0.3V to VIN Storage Temperature (Ts) .........................-60C to +150C ESD Rating(3) .................................................................. 2kV
Operating Ratings(2)
Supply Voltage (VIN)..................................... +2.7V to +5.5V Logic Input Voltage (VEN,VLOWQ)........................ -0.3V to VIN Junction Temperature (TJ) ........................ -40C to +125C Junction Thermal Resistance Thin MLF-10L (JA) ............................................90C/W
Electrical Characteristics DC/DC(4)
VEN = VIN = 3.6V, L = 2.2H; COUTDC/DC = 2.2F, CLDO = 2.2F; IOUTDC/DC = 100mA; CBIAS = 0.1F VENLDO = 0V; TJ = 25C, bold values indicate -40C < TJ < +125C; unless noted.
Parameter UVLO Threshold UVLO Hysteresis Switcher Ground Pin Current LDO Ground Pin Current Ground Pin Current in Shutdown Over-temperature Shutdown Over-temperature Shutdown Hysteresis Enable Input Voltage Enable Input Current Turn-on Time Fixed Output Voltages Current Limit in PWM Mode Output Voltage Line Regulation Output Voltage Load Regulation Maximum Duty Cycle PWM Switch ON-Resistance Oscillator Frequency Logic Low Logic High VIL < 0.2V VIH > 1.0V ILOAD = 5mA Nominal VOUT tolerance Io=50mA VFB = 0.9*VNOM VIN = 2.7V to 5.5V, ILOAD= 100mA 20mA < ILOAD < 300mA VFB 0.4V ISW = 150mA; VFB = 0.7VFB_NOM ISW = -150mA; VFB = 1.1VFB_NOM 1.8 100 0.4 0.4 2 2.2 -2 -3 0.675 0.95 0.12 0.2 1 1.5 1.0 0.1 0.1 50 +2 +3 1 1 ENLDO = 0V, VFB = GND ; IL=0mA EN = 0V EN +ENLDO = 0V Condition Rising input voltage during turn-on Min 2.45 Typ 2.55 70 850 67 0.2 160 23 0.2 1100 110 5 Max 2.65 Units V mV A A A C C V V A A s % % A % % % % MHz
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Electrical Characteristics LDO(4)
COUTLDO = 2.2F, IOUTLDO = 100A; TJ = 25C, bold values indicate -40C < TJ < +125C; unless noted.
Parameter Input Voltage Output Voltage Accuracy Line Regulation Turn-on Time Load Regulation Dropout Voltage, Note 5 Ripple Rejection Current Limit Output Voltage Noise
Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 4. Specification for packaged product only. 5. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value that is initially measured at a 1V differential. For outputs below 2.7V, the dropout voltage is the input-to-output voltage differential with a minimum input voltage of 2.7V.
Condition Variation from nominal VOUT Variation from nominal VOUT; -40C to +125C VIN = VOUT +1V to 5.5V; IOUT = 100A ILOAD = 300mA IOUT = 100A to 300mA @ VIN = VOUT + 1 IOUT = 300mA @ VIN = 2.7V f = 1kHz; COUT = 2.2F f = 20kHz; COUT = 2.2F VOUT = 0V COUT = 2.2F, 10Hz to 100kHz
Min 2.7 -2.0 -3.0
Typ
Max 5.5 +2.0 +3.0
Units V % % % s % mV dB dB mA VRMS
0.2 30 0.70 210 43 17 400 470
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Typical Characteristics (DC-DC)
1.2V Efficiency @ -40C
100 90 80 70 60 50 40 30 20 10 0 0 0.1 0.2 0.3 0.4 0.5 LOAD CURRENT (A) 0.6 5.5VIN 2.7VIN 3.6VIN 100 90 80 70 60 50 40 30 20 10 0 0 0.1 0.2 0.3 0.4 0.5 LOAD CURRENT (A) 0.6 5.5VIN
1.2V Efficiency @ 25C
2.7VIN
100
1.2V Efficiency @ 70C
90 80 70 60 50 40 30 20 10 0 0 2.7VIN 3.6VIN
3.6VIN
5.5VIN
0.1 0.2 0.3 0.4 0.5 LOAD CURRENT (A)
0.6
150 125 100 75 50 25 0 2.5
Quiescent Current vs. Input Voltage
1200 1000 800 600
Quiescent Current vs. Load Current
1.4 1.2 1.0 0.8 0.6
Enable Threshold vs. Input Voltage
VOUT = 1.2V LOAD = 0 ENLDO = 0V EN = VIN 3 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5
400 200 0 VOUT = 1.2V EN = VIN ENLDO = 0V 30 40 50 60 LOAD CURRENT (mA)
0.4 0.2 0 2.5 3 VOUT = 1.19V ENLDO = 5V 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5
100 90 80 70 60 50 40 30 20 10 0 2.5
Turn-On Time vs. Input Voltage
1.0 0.9 0.8 0.7 0.6 0.5 0.4
Peak Current Limit vs. Input Voltage
2.9 2.7 2.5 2.3 2.1 1.9
Frequency vs. Input Voltage
VOUT = 1.19V VLDO = 2.8V ENLDO = 5V 3 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5
0.3 0.2 0.1 0 2.5
VOUT = 1.2V EN = ENLDO = VIN 3 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5
1.7 1.5 2.5 3
VOUT = 1.2V LOAD = 0 ENLDO = VIN 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5
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Typical Characteristics (LDO)
PSRR
70 60 50 40 300mA 30 20 10mA 100mA 90 80 70 60 50 40 30 20 10 100K 0 0 ENLDO = VIN 1 2 3 4 INPUT VOLTAGE (V) 5 0mA 100mA 60mA
Quiescent Current vs. Input Voltage
80 78 76 74 72 70 68 66 64
Quiescent Current vs. Load Current
VIN = 1.7V 10 VOUT = 2.8V COUT = 2.2F 0 100 1K 10K FREQUENCY (Hz)
VIN = 3.6V 62 ENLDO = VIN 60 0.025 0.075 0.125 0.175 0.225 0.275 LOAD CURRENT (A)
125 100 75 50 25
Quiescent Current vs. Temperature
3.00 2.95 2.90 2.85 2.80
Output Voltage vs. Load Current
3.00 2.95 2.90 2.85 2.80 2.75 2.70 2.65 2.60
Output Voltage vs. Temperature
50mA 100mA
1mA VIN = 3.6V ENLDO = VIN
2.75 2.70 2.65 2.60 2.55 VIN = 3.6V ENLDO = VIN
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
2.50 0.025 0.075 0.125 0.175 0.225 0.275 LOAD CURRENT (A)
2.55 2.50 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
VIN = 3.6V ENLDO = VIN Load = 1mA
2.86 2.84 2.82 2.8 2.78 2.76 2.74 2.72 2.70 2.68
Output Voltage vs. Temperature
0.20 0.18 0.16 0.14 0.12 0.10 0.08 0.06
Dropout Voltage vs. Load Current
50 40
Dropout Voltage vs. Temperature
ENLDO = VIN 50mA
30 20 10 25mA 10mA
2.66 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
VIN = 3.6V ENLDO = VIN Load = 10mA
0.04 0.02 0 0
VIN = 3.6V ENLDO = VIN 0.05 0.1 0.15 0.2 0.25 0.3 LOAD CURRENT (A)
1mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 2.5
Peak Current Limit vs. Input Voltage
50 45 40 35 30 25 20 15 10 5 0 2.5
Turn-On Time vs. Input Voltage
1.4 1.2 1.0 0.8 0.6 0.4 0.2
Enable Threshold vs. Input Voltage
EN = ENLDO = VIN 3 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5
ENLDO = VIN 3 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5
0 2.5
3
LDO = 2.8V 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V)
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Typical Characteristics (LDO) continued
3.0 2.5 2.0 1.5 1.0 0.5 0 10 100 1K 10K 100K FREQUENCY (Hz) 1M
Output Noise Spectral Density
VIN = 3.6V VOUT = 3.3V COUT = 2.2F CBYP = 0.1F
Noise(10Hz-100kHz) = 169VRMS
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Functional Characteristics
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Functional Diagram
VIN AVIN
6 P-Channel Current Limit
BIAS
HSD
SW VOUT1
PWM Control
Anti-Shoot Through
LSD
COUT1
N-Channel Current Limit
FB
EN ENLDO
Enable and Control Logic
Bias, UVLO, Thermal Shutdown
Soft Start
EA
1.0V LDO Block LDO VOUT2
LDO Current Limit
EA
COUT2
1.0V
SGND
PGND
MIC2225 Block Diagram
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Functional Description
VIN VIN provides power to the MOSFETs for the switch mode regulator section, along with the current limiting sensing. Due to the high switching speeds, it is recommended that an 1F capacitor be placed close to VIN and the power ground (PGND) pin for bypassing. Please refer to layout recommendations. AVIN Analog VIN (AVIN) provides power to the LDO section and the bias through an internal 6 resistor. AVIN and VIN must be tied together. Careful layout should be considered to ensure high frequency switching noise caused by VIN is reduced before reaching AVIN. LDO The LDO pin is the output of the linear regulator and needs to be connected to a 2.2F output capacitor. EN The enable pin provides a logic level control of the output. In the off state, the supply current of the device is greatly reduced (typically <1A). Also, in the off state, the output drive is placed in a "tri-stated" condition, wherein both the high side P-channel MOSFET and the low-side N-channel are in an "off" or non-conducting state. Do not drive the enable pin above the supply voltage. ENLDO The enable pin provides a logic level control of the LDO output. In the off state, supply current of the device is greatly reduced (typically <1A). Do not drive the enable pin above the supply voltage. BIAS The BIAS pin supplies the power to the internal power to the control and reference circuitry. The bias is powered from AVIN through an internal 6 resistor. A small 0.1F capacitor is recommended for bypassing. FB The feedback pin (FB) provides the control path to control the output. For fixed output, the controller output is directly connected to the feedback (FB) pin. SW The switch (SW) pin connects directly to the inductor and provides the switching current necessary to operate in PWM mode. Due to the high speed switching on this pin, the switch node should be routed away from sensitive nodes. PGND Power ground (PGND) is the ground path for the high current PWM mode. The current loop for the power ground should be as small as possible and separate from the Analog ground (AGND) loop. Refer to the layout considerations for more details. SGND Signal ground (SGND) is the ground path for the biasing and control circuitry. The current loop for the signal ground should be separate from the Power ground (PGND) loop. Refer to the layout considerations for more details.
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MIC2225 not recommended. In addition to a 2.2F, a small 10nF is recommended close to the load for high frequency filtering. Smaller case size capacitors are recommended due to there lower ESR and ESL. Inductor Selection The MIC2225 is designed for use with a 2.2H inductor. Proper selection should ensure that the inductor can handle the maximum average and peak currents required by the load. Maximum current ratings for the inductor are generally given in two methods; permissible DC current and saturation current. Permissible DC current can be rated either for a 40C temperature rise or a 10% to 20% loss in inductance. Ensure that the inductor selected can handle the maximum operating current. When saturation current is specified, make sure that there is enough margin so that the peak current will not saturate the inductor. Peak inductor current can be calculated as follows:
V VOUT 1 - OUT VIN + 2x f xL
Application Information
The MIC2225 is a 600mA PWM and 300mA LDO dual power supply. Both PWM output and LDO outputs are independent and are controlled by EN and ENLDO pins respectively. These enable pins are logic level compatible. Input Capacitor A minimum 1F ceramic is recommended on the VIN pin for bypassing. X5R or X7R dielectrics are recommended for the input capacitor. Y5V dielectrics loose most of their capacitance over temperature and are therefore, not recommended. A minimum 1F is recommended for placement close to the VIN and PGND pins for high frequency filtering. Smaller case size capacitors are recommended due to their lower ESR and ESL. Please refer to layout recommendations for proper layout of the input capacitor. Output Capacitor Even though the MIC2225 is optimized for a 2.2F output capacitor, output capacitance can be varied from 1F to 10F. The MIC2225 utilizes Type III internal compensation and utilizes an internal high frequency zero to compensate for the double pole roll off of the LC filter. For this reason, larger output capacitors can create instabilities. X5R or X7R dielectrics are recommended for the output capacitor. Y5V dielectrics lose most of their capacitance over temperature and are therefore,
IPK = IOUT
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PCB Layout Recommendations
Top Layer
Bottom Layer
Note: The above figures demonstrate the recommended layout for the MIC2225 fixed output option.
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MIC2225
J1 VIN 5.5V Max JP1 1X2 J7 ENLDO R2 10k J2 GND
1
MIC2225
8
L1 0.47H / 2.2H
9 5
R1 10k J6 EN
C1 2.2F/ 6.3V
VIN AVIN EN ENLDO BIAS
SW FB
4
R3 0
6 7 3
J3 VO1 C4 2.2F/ 6.3V J4 VO2
2
LDO
2
C2 0.1F/ 6.3V
PGND AGND
10 1
C3 2.2F/ 6.3V
J5 GND
Schematic Diagram
Bill of Materials
Item C1 C2 C3 C4 R1 R2 R3 L1 U1
Notes: 1. TDK: www.tdk.com 2. Vishay: www.vishay.com 3. Sumida: www.sumida.com 4. Micrel, Inc.: www.micrel.com
Part Number C1608X5R0J225K VJ0402Y104KXQCW1BC C1608X5R0J225K C1608X5R0J225K CRCW06031002FKEYE3 CRCW06031002FKEYE3 CRCW08050000FKEYE3 CDRH2D11/HPNP-2R2NC MIC2225-XYMT
Manufacturer TDK TDK
(1) (2)
Description 2.2F/6.3V, X5R 0.1F/6.3V, X7R 2.2F/6.3V, X5R 2.2F/6.3V, X5R
Qty. 1 1 1 1 1 1 1 1 1
Vishay Vitramon
(1)
TDK(1) Vishay Dale Vishay Dale Sumida
(3) (2) (2)
10k, 0603, 1/16W, 1% 10k, 0603, 1/16W, 1% 0, 0805, 1/8W, 1% 2.2H, 1.1A (Isat) 2Mhz PWM Synchronous Buck Regulator with 300mA LDO
Vishay Dale(2) Micrel, Inc.
(4)
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Package Information
10-Pin Thin MLF(R) (MT)
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
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can 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 significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2007 Micrel, Incorporated.
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