UC3666L-B10-R

UNISONIC TECHNOLOGIES CO., LTD UC3666 Preliminary CMOS IC DUAL CHANNEL 800mA HIGH EFFICIENCY STEP-DOWN DC/DC CONVERTER DESCRIPTION The UTC UC3666 is a dual channel high efficiency step-down DC/DC converter with constant frequency and current mode. A main switch and a synchronous rectifier for high efficiency are contained in each converter, and thus an external Schottky diode is saved. Supply current is only 300μA during normal operation and is reduced to less than 1μA in shutdown mode. The output voltage can be adjusted to as low as 0.6V. With input voltage range from 2.5V ~ 5.5V , each converter can deliver 800mA current to the load. Due to the internally fixed 1.8MHz switching frequency , small surface mount inductors and capacitors can be used. It can also run 100% duty cycle for low dropout applications. The UTC UC3666 is generally used in digital still cameras, portable instruments, slim-type DVD, microprocessors and DSP core supplies, wireless and DSL card, PDAs, smart phones, cellular telephones and so on. 1 SON-10 FEATURES * high efficiency * Current mode operation * Low quiescent current less than 300uA (Active mode) * Input voltage varying from 2.5V to 5.5V * Output current on each channel: 800mA * Fixed frequency operation * 0 - 100% full duty ratio in dropout * 0.6V reference allows low output voltages * Over-temperature protection circuit * Shutdown current less than 0.1μA * RoHS Compliant (100% green available) * Halogen Free ORDERING INFORMATION Ordering Number Lead Free Halogen Free UC3666L-B10-R UC3666G-B10-R Note: xx: Output Voltage, refer to Marking Information. Package SON-10 Packing Tape Reel www.unisonic.com.tw Copyright © 2010 Unisonic Technologies Co., Ltd 1 of 8 QW-R502-489.a UC3666 PIN CONFIGURATION Preliminary CMOS IC Top View EN1 FB1 VIN2 GND2 SW2 1 2 3 4 5 Exposed Pad On Backside 10 SW1 9 8 7 6 GND1 VIN1 FB2 EN2 PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 7 8 9 10 PIN NAME EN1 FB1 VIN2 GND2 SW2 EN2 FB2 VIN1 GND1 SW1 DESCRIPTION Channel 1 Regulator Enable Control Input Pin. Drive EN1 above 1.5V to turn on channel1. Drive EN1 below 0.3V to turn it off (shutdown current < 0.1uA). Channel 1 Voltage Feedback Pin Channel 2 Supply Pin Channel 2 Ground Pin Channel 2 Power Switch Output Channel 2 Regulator Enable Control Input Pin. Drive EN2 above 1.5V to turn on channel2. Drive EN2 below 0.3V to turn it off (shutdown current < 0.1uA). Channel 2 Voltage Feedback Pin Channel 1 Supply Pin Channel 1 Ground Pin Channel 1 Power Switch Output UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 8 QW-R502-489.a UC3666 BLOCK DIAGRAM Preliminary CMOS IC VIN1 VIN2 EN1 EN2 Reference + Current Sense Amplifier EN Logic UVLO + - Soft Start Slop Comp M1 UG 0.6V + + Error Amplifier PWM Comparator PWM Logic RS & Drive M2 Oscillator Clock LG SW1 SW2 FB1 FB2 DCC Zero-Current Comparator + GND1 GND2 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 8 QW-R502-489.a UC3666 ABSOLUTE MAXIMUM RATING Preliminary CMOS IC PARAMETER SYMBOL RATINGS UNIT Input Supply Voltage VIN GND-0.3 ~ +6.5 V SW Voltage -0.3 ~ VIN +0.3 V ENB, VFB Voltage -0.3 ~ VIN V SW Peak Current 1.5 A ESD Classification Class 2 Junction Temperature TJ 125 °C Operating Temperature Torp -20 ~ +85 °C Storage Temperature Range TSTG -65 ~ +150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. The IC has a protection circuit against static electricity. Do not apply high static electricity or high voltage that exceeds the performance of the protection circuit to the IC. THERMAL DATA PARAMETER Junction ambient specified; VIN=3.6V, TA=0 ~ 70°C (typical=25°C)) PARAMETER Supply Voltage Feedback Current Regulated Feedback Voltage Reference Voltage Line Regulation Output Voltage Line Regulation Output Voltage Load Regulation Shutdown Current SW Leakage Current PMOSFET On Resistance NMOSFET On Resistance PMOSFET Current Limit Oscillator Frequency Thermal Shutdown Threshold EN High Level Input Voltage EN Low Level Input Voltage EN Input Current SYMBOL VIN IVFB VFB ΔVFB ΔVOUT VLOADRGE IS ILEAK RDSONP RDSONN IPCL fOSC TS VEN VEN IEN TEST CONDITIONS MIN 2.5 -30 0.588 0.582 TYP 0.5 0.6 0.6 0.04 0.04 0.5 0.01 0.35 0.24 0.9 1.2 -40°C≤TA≤+85°C -40°C≤TA≤+85°C VEN=0V ~ VIN 0.9 -1 0.3 1 1.2 1.6 145 MAX UNIT 5.5 V 30 nA 0.612 V 0.618 V 0.4 %V 0.4 %V % 1 µA 1 µA Ω Ω 1.4 2.0 A MHZ °C V V µA SYMBOL θJA TYP MAX 50 UNIT °C/W ELECTRICAL CHARACTERISTICS (Recommended Operating Conditions, unless otherwise TA=25°C -40°C≤TA≤85°C VIN=2.5V ~ 5.5V VIN=2.5V ~ 5.5V VEN=0V, VIN=5.5V VEN=0V, VIN=5.5V, VSW=0V or 5.5V ISW=100mA ISW=100mA Duty Cycle=100% Current Pulse Width