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UC3551

Unisonic Technologies
Part Number UC3551
Manufacturer Unisonic Technologies
Description ADVANCED PWM STEP-UP DC-DC CONVERTER
Published Mar 7, 2016
Detailed Description UNISONIC TECHNOLOGIES CO., LTD UC3551 Preliminary ADVANCED PWM STEP-UP DC-DC CONVERTER CMOS IC „ DESCRIPTION The UT...
Datasheet PDF File UC3551 PDF File

UC3551
UC3551

Overview
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 ...


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