RT4812

Copyright © 2015 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS4812-00

June

2015

www.richtek.com

1

High Efficiency Boost Converter

General Description

The RT4812 allows systems to take advantage of new

battery chemistries that can supply significant energy

when the battery voltage is lower than the required

voltage for system power ICs. By combining built-in

power transistors, synchronous rectification, and low

supply current; this IC provides a compact solution for

systems using advanced Li-Ion battery chemistries.

The RT4812 is a boost regulator designed to provide a

minimum output voltage from a single-cell Li-Ion battery,

even when the battery voltage is below system

minimum. In boost mode, output voltage regulation is

guaranteed to a maximum load current of

2A.

Quiescent current in Shutdown Mode is less than 1

A,

which maximizes battery life.

Ordering Information

RT4812

Package Type

J8F : TSOT-23-8 (FC)

Lead Plating System

G : Green (Halogen Free and Pb Free)

Note :

Richtek products are :



RoHS compliant and compatible with the current

requirements of IPC/JEDEC J-STD-020.



Suitable for use in SnPb or Pb-free soldering processes.

Features



CMCOT Topology and Small Output Ripple

when VIN close VOUT Voltage



Operates from a Single Li-ion Cell : 1.8V to 5.5V



Adjustable Output Voltage : 1.8V to 5.5V



PSM Operation



Up to 96% Efficiency



Boost Current Limit



Input/Output Over Voltage Protection



Pin Adjustable Current Limit Threshold

(2 levels)



Internal Compensation



Output Discharge



Output Short Protection



True Load Disconnect

Applications



Single-Cell Li-Ion, LiFePO4 Smart-Phones



Portable Equipment

Marking Information

0L= : Product Code

DNN : Date Code

0L=DNN

Simplified Application Circuit

GND

SW

VOUT

EN

L1

C1

VIN

C2

C3

FB

RT4812

R1

R2

ILIM

H/L