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UC3551 Dataheets PDF



Part Number UC3551
Manufacturers Unisonic Technologies
Logo Unisonic Technologies
Description ADVANCED PWM STEP-UP DC-DC CONVERTER
Datasheet UC3551 DatasheetUC3551 Datasheet (PDF)

UNISONIC TECHNOLOGIES CO., LTD UC3551 Preliminary ADVANCED PWM STEP-UP DC-DC CONVERTER CMOS IC „ DESCRIPTION The UTC UC3551 is a step-up DC/DC converter with high efficiency and low start-up voltage. It is operaded in stable waveforms without external compensate. This device incorporates an adaptive current mode PWM control loop in which an error amplifier, ramp generator, comparator, switch pass element and driver are included. Besides, this circuit provides a stable and high efficient ope.

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UNISONIC TECHNOLOGIES CO., LTD UC3551 Preliminary ADVANCED PWM STEP-UP DC-DC CONVERTER CMOS IC „ DESCRIPTION The UTC UC3551 is a step-up DC/DC converter with high efficiency and low start-up voltage. It is operaded in stable waveforms without external compensate. This device incorporates an adaptive current mode PWM control loop in which an error amplifier, ramp generator, comparator, switch pass element and driver are included. Besides, this circuit provides a stable and high efficient operation over a wide range of load currents. The UTC UC3551 features high switching rate which is up to 450 KHz, making the external component counts less required. Moreover, it features 17μA low quiescent current, which makes the battery life longer. The low start-up input voltage below 1V makes UTC UC3551 suitable for 1 to 4 battery cells applications of providing up to 300mA output current. Two external resistors determine the value of the output voltage. The external power devices (NMOS or NPN) are derived by both internal 2A switch and driver. The UTC UC3551 is intended to be used in PDA, DSC, LCD Panel, RF-Tags, MP3, portable instrument and wireless equipment. „ FEATURES * Low Start-up Input Voltage is as Low as 1.0V * Efficiency up to 90% * High Supply Capability to Deliver 3.3V 100mA with 1 Alkaline Cell * Quiescent (Switch-off) Supply Current: 17µA * Zero Shutdown Mode Supply Current * Fixed Switching Frequency: 450KHz * Both Internal and External Power Switches for Maximum Flexibility „ ORDERING INFORMATION Ordering Number Lead Free Halogen Free UC3551L-AG6-R UC3551G-AG6-R Package SOT-26 UC3551L-AG6-R (1)Packing Type (2)Package Type (3)Lead Free (1) R: Tape Reel (2) AG6: SOT-26 (3) G: Halogen Free, L: Lead Free Packing Tape Reel www.unisonic.com.tw Copyright © 2011 Unisonic Technologies Co., Ltd 1 of 6 QW-R502-555.a UC3551 „ MARKING INFORMATION PACKAGE VOLTAGE CODE Preliminary MARKING SOT-26 AD:ADJ „ PIN CONFIGURATION CMOS IC „ PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 PIN NAME CE EXT GND LX VDD FB DESCRIPTION Chip enable UC3551 gets into shutdown mode when CE pin set to low. Output pin for driving external NMOS Ground Pin for switching Input positive power pin of UC3551 Feedback input pin Internal reference voltage for the error amplifier is 1.25V. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R502-555.a UC3551 „ BLOCK DIAGRAM LX GND EXT Preliminary VLx Limiter Buffer Control Circuit Vref + - Chip Enable Over Temp Detector EN CMOS IC VDD FB UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 6 QW-R502-555.a UC3551 Preliminary CMOS IC „ ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Supply Voltage LX Pin Switch Voltage VIN − 0.3 ~ 7 V VLX − 0.3 ~ (VDD + 0.8) V Other I/O Pin Voltages LX Pin Switch Current − 0.3 ~ (VDD + 0.3) V ILX 2.5 A EXT Pin Driver Current Operating Junction Temperature IEXT TOPR 200 mA 125 °C Storage Temperature TSTG -65~+150 °C Notes: Absolute.


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