UC4601L-AF5-R

UNISONIC TECHNOLOGIES CO., LTD UC4601 Preliminary CMOS IC PWM STEP-DOWN DC-DC CONTROLLER DESCRIPTION The UTC UC4601 is a PWM step-down DC/DC controller. It has a low supply current. The step-down DC/DC converter with low ripple, high efficiency performance is conveniently configured with additional external components, such as a power-transistor, an inductor, a diode and capacitors. The output voltage can be adjusted with external components. The UTC UC4601 contains a high precision band-gap voltage reference, a PWM control circuit, a soft-start circuit, a protection circuit, an oscillator, an error amplifier with built-in compensation network and input/output voltage detection circuits. The UTC UC4601 based DC/DC converter can performance well when maintaining stability, which is due to its built-in state-of-art control algorithm. Further, if the term of maximum duty cycle retains on a certain time, the embedded protection circuits restart the operation with soft-start and repeat until the maximum duty cycle condition is released. Finally, the internal UVLO function blocks potentially unstable output when the input voltage reaches the UVLO threshold or less. This is aiming at making this circuit standby for low power consumption. The UTC UC4601 can be applied in battery-powered equipment, hand-held communication equipment, cameras, video instruments such as VCRs, camcorders, household electrical appliances. FEATURES * 500kHZ oscillation frequency * Input voltage varies from 2.3V to 18V * Low temperature coefficient of output voltage: Typ. ±100ppm/°C * Internal soft-start and protection function * High efficiency up to 90% (TYP.) * High output voltage accuracy: ±2% * Standly current: 0.1μA (TYP.) * CMOS output capability ORDERING INFORMATION Ordering Number Lead Free Halogen Free UC4601L-AF5-R UC4601G-AF5-R UC4601L - AF5 - R (1) Packing Type (2) Package Type (3) Lead Free (1) R: Tape Reel (2) AF5: SOT-25 (3) G: Halogen Free, L: Lead Free Package SOT-25 Packing Tape Reel www.unisonic.com.tw Copyright © 2011 Unisonic Technologies Co., Ltd 1 of 4 QW-R502-494.b UC4601 MARKING 3 2 UJ46 4 5 1 G: Halogen Free L : Lead Free Preliminary CMOS IC PIN CONFIGURATION PIN DESCRIPTION PIN NO 1 2 3 4 5 PIN NAME CE GND VFB EXT VIN DESCRIPTION Chip Enable. Active with “H” Ground Feedback Voltage External Transistor Driver Pin (CMOS output) Power input voltage UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 4 QW-R502-494.b UC4601 ABSOLUTE MAXIMUM RATING Preliminary CMOS IC PARAMETER SYMBOL RATINGS UNIT VIN Supply Voltage VIN 20 V Ext Pin Output Voltage VEXT -0.3 ~ VIN+0.3 V CE Pin Input Voltage VCE -0.3 ~ VIN+0.3 V VOUT/VFB Pin Input Voltage VOUT/VFB -0.3 ~ 6 V Ext Pin Output Current IEXT ±50 mA Power Dissipation PD +250 mW Operating Temperature TOPR -40 ~ +85 °C Storage Temperature TSTG -55 ~ +125 °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. OPERATING RANGE PARAMETER VIN Supply Voltage Ext Pin Output Voltage CE Pin Input Voltage VOUT/VFB Pin Input Voltage Ext Pin Output Current SYMBOL VIN VEXT VCE VOUT/VFB IEXT RATINGS 2.5 ~ 18 -0.3 ~ VIN+0.3 -0.3 ~ VIN+0.3 -0.3 ~ 5.5 ±50 UNIT V V V V mA ELECTRICAL CHARACTERISTICS (TOPR=25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS Adjustable Output Voltage Type Operating Voltage VIN Feedback Voltage VFB VIN=VCE=8V, ILOAD =350mA Feedback Voltage Temperature ΔVFB/ΔT -40°C