MIC3385 Micrel Semiconductor, MIC3385 Datasheet
MIC3385
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MIC3385 Summary of contents
Page 1
... General Description The Micrel MIC3385 is a high efficiency Power System on a Chip that features a LOWQ™ LDO standby mode that draws only 18µA of quiescent current. The MIC3385 requires no external inductor enabling an ultra-low noise, small size, and high efficiency solution for portable power applications ...
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... LDO Output (Output): Connect to V Internal circuit bias supply. Must be de-coupled to signal ground with a 0.1 µ F capacitor and should not be loaded. 2 Package Lead Finish ® 14-Pin 3mm x 3.5mm MLF 14 BIAS 13 LDO 12 AVIN 11 GND ® (ML) for LDO mode operation. OUT MIC3385 Pb-free M9999-111006-A ...
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... V )....................... –0. LOWQ ) ........................ –40°C to +125°C J 3mm x 3.5mm MLF-14L (θ ) ............................55°C/W JA Min Typ 2.7 2.45 2.55 100 690 16 0.01 0.99 1 0. 100mA 0.13 0.2 0.1 100 0.4 0.4 7.2 8 0.5 0.85 0.1 0.5 0.85 0.1 110 MIC3385 IN < +125°C. J Max Units 5 900 µA 29 µA 5 µA 1. 0 Ω 8.8 MHz 1 µA 1 µA ...
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... 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 differential. For outputs below 2.7V, the dropout voltage is the input-to-output voltage differential with a minimum input voltage of 2.7V. November 2006 = 10µF, 10Hz to 100kHz OUT = 0V (LDO Mode) OUT 4 MIC3385 Min Typ Max Units 75 µVrms 60 ...
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... V =3. =4. 100 200 300 400 500 OUTPUT CURRENT (mA) Frequency vs. Input Voltage 9.0 8.5 8.0 7.5 7.0 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 INPUT VOLTAGE (V) 5 MIC3385 1.5V Efficiency OUT 100 90 V =3. =3. =4. 100 200 300 400 500 OUTPUT CURRENT (mA) Load Regulation 1.018 1 ...
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... Micrel, Inc. Typical Characteristics ― LDO Mode November 2006 6 MIC3385 M9999-111006-A ...
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... Micrel, Inc. Typical Characteristics ― LDO Mode (cont.) November 2006 7 MIC3385 M9999-111006-A ...
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... Load Transient PWM Mode 10mA Time (20µs/div) Enable Transient PWM Mode 0V 0V Time (40µs/div) November 2006 10mA C = 4.7µF OUT 4.7µF OUT 8 Load Transient LDO Mode C = 4.7µF OUT Time (20µs/div) Enable Transient LDO Mode C = 4.7µF OUT Time (40µs/div) M9999-111006-A MIC3385 ...
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... Micrel, Inc. Functional Diagram November 2006 MIC3385 Block Diagram 9 MIC3385 M9999-111006-A ...
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... GND Combines PGND and SGND Power ground (PGND) is the ground path for the high current PWM mode. Signal ground (SGND) is the ground path for the biasing and control circuitry. 10 MIC3385 ) can be calculated as FF M9999-111006-A ...
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... ESL. Please refer to layout recommendations for proper layout of the input capacitor. Output Capacitor The MIC3385 is optimized for a 10µF output capacitor. A larger value can be used to improve transient response The MIC3385 utilizes type III internal compensation and utilizes an internal high frequency zero to compensate for the double pole roll off of the LC filter ...
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... Micrel, Inc. Layout Recommendations November 2006 Top Layer 12 MIC3385 M9999-111006-A ...
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... Micrel, Inc. Note: The above figures demonstrate the recommended layout for the MIC3385 adjustable option. November 2006 Bottom Layer 13 MIC3385 M9999-111006-A ...
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... Vin MIC3385YML 2 VIN C1 12 AVin 10µF/6. LOWQ R3 Vin 20K 14 BIAS C2 0.1µF/6.3V MIC3385 Adjustable Output Schematic Manufacturer (1) TDK 10µF Ceramic Capacitor X5R, 6.3V (2) Taiyo Yuden (3) Murata 10µF Ceramic Capacitor X7R, 6.3V (1) TDK 1µF Ceramic Capacitor X5R, 6.3V (4) AVX (5) Vishay 1µF Ceramic Capacitor X7R, 6.3V (1) TDK ...
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... 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 November 2006 14-Pin 3mm x 3.5mm MLF indemnify Micrel for any damages resulting from such use or sale. © 2006 Micrel, Incorporated. 15 ® (ML) MIC3385 M9999-111006-A ...