RT9536H datasheet(3/15 Pages) RICHTEK

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RT9536H

DS9536H-00

June 2015

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Operation

The RT9536H is designed for single cell Li-Ion battery

charger in portable applications.

Base Circuit

The Base circuit provides the internal power for VDD, VREF

reference voltage and bias current.

Power Switch with Switch Well Circuits

The main power switch between VIN and BATT is designed

to control the charge current for battery. The switch well

is designed to avoid the reverse current from battery to

input power.

Sleep Mode

When the charger is only connected to battery with no

input power, the charger will enter sleep mode and the

leakage current from battery to the charger will be less

than 10

μA for low power consumption

Current Set Block

The charge current is adjustable from the ISET pin with

an external resistor between the ISET and GND. The End-

of-Charge current is also adjustable by an external resistor

connected from the IEOC pin to GND. If the charging

current is less than EOC current, the CHGSB pin will be

pulled high.

Protection

The protection circuits include OVP, UVLO and OTP. When

the protection circuit is triggered, the main power switch

will be turned of to protect the charging system.

Multi-Loop Controller

The Multi-Loop controller controls the operation during

the charging process. The controller will make sure the

battery is well charged in a suitable current, voltage, and

die temperature.

Status Indicator

The CHGSB and PGB pin indicate the charger and power

condition. During the charging process, the CHGSB pin

is pulled low. When the charger is under charge done

condition or abnormal condition, the CHGSB will be high

impedance. The PGB pin indicates the input power status

at VIN pin. When the input power is normal, the PGB pin

is pulled low.

Operation Mode

The RT9536H provides programmable output current mode

setting including USB100, USB500 and Factory mode.

The operation mode is programmable through the input

pulse number at EN/SET pin. Under the factory mode,

besides the EN/SET is also used to set regulation to be

4.25V or 4.4V. Output current is up to 2.3A.

LDO

The RT9536H provides a LDO regulator to support the

peripheral circuits. The output voltage is regulated to 4.9V

and the maximum output current is 50mA.

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