RT9505GQW View Datasheet(PDF) - Richtek Technology

Part Name

Description

MFG CO.

RT9505GQW

Linear Single Cell Li-Ion Battery Charger IC

Richtek Technology 

RT9505

RT9505 Flow Chart

Start-Up

ACIN

Power Up

VEN > 1.4V ?

NO

VACIN > 6.5V or

VACIN < 4.4V?

NO

VACIN < VBATT ?

NO

1ms Delay

Table

Precharge Phase

Fast Charge Phase

Standby/Fault

Recharge Phase

YES

YES

YES

DISABLE MODE

P-MOSFET OFF

IBATT = 0

OVP/UVP MODE

P-MOSFET OFF

IBATT = 0

SLEEP MODE

P-MOSFET OFF

IBATT = 0

VTS > 2.5V

or

VTS < 0.5V?

NO

VBATT > 2.8V?

NO

YES

YES

IBATT = 0.1 Charge

Current

/CHG_S Pull Down

TEMP

FAULT/CHG_S

HIGH

IMPEDANCE

IBATT = Charge

Current

/CHG_S Pull Down

YES

NO

VBATT ~ 4.2V,

IBATT < 0.1 ICHG?

YES

STANDBY

PFET OFF

VBATT = 4.2V,

IBATT = 0

RECHARGE

YES

VBATT > 4.1 V?

NO

www.richtek.com

4

DS9505-02 April 2011

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