RT9262/A

Preliminary

www.richtek.com

DS9262/A-04 August 2002

4

Pin Description

Pin No.

RT9262

RT9262A

Pin Name

Pin Function

11

GND

Ground

2

2

EXT

Output pin for driving external NMOS or NPN

When driving an NPN, a resistor should be added for limiting base current.

3--

LFB

Feedback pin of the built-in LDO (Internal Vref = 0.86V)

4--

LDOO

Voltage output pin of the built-in LDO

--

3

LBO

Drain output pin of the NMOS of the built-in low voltage detector

This pin will be internally pulled low when the voltage at LBI pin drops to

below 0.86V.

--

4

LBI

Input pin of the built-in low voltage detector

Trip point = 0.86V

55

FB

Feedback input pin

Internal reference voltage for the error amplifier is 1.25V.

66

VDD

Input positive power pin of RT9262/A

77

LX

Pin for switching

88

CE

Chip enable

RT9262/A gets into shutdown mode when CE pin set to low.

Absolute Maximum Ratings

Supply Voltage

-0.3V to 7V

LX Pin Switch Voltage

-0.3V to (VDD + 0.8V)

LDO Output Voltage

-0.3V to (VDD + 0.3V)

Other I/O Pin Voltages

-0.3V to (VDD + 0.3V)

LX Pin Switch Current

2.5A

EXT Pin Driver Current

30mA

LBO Current

30mA

SOP-8

0.625W

• Package Thermal Resistance

SOP-8,

160

°C/W

Operating Junction Temperature

150

°C

Storage Temperature Range

-65

°C ~ +150°C