LB1138BG-12-AF5-R datasheet(5/7 Pages) UTC

Part #	LB1138BG-12-AF5-R

Description	HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR

PDF	7 Pages

Scroll/Zoom	100%

Manufacturer	UTC [Unisonic Technologies]

Direct Link	http://www.utc-ic.com

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5 / 7 page

L1138B

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

5 of 7

www.unisonic.com.tw

QW-R502-323.K



OPERATION

1. Basic operation

The reference voltage (VREF) and VFB(the output voltage resistance-divided by feedback resistors RS and RF)

are the input for the error amplifier.

2. Output transistor

A low on-resistance P-channel MOSFET is used as the output transistor. Inverse current flowing from VOUT pin

through a parasitic diode to VIN pin can damage the regulator, so be sure that VOUT does not exceed VIN + 0.3V.

3. Shutdown pin (ON/OFF pin)

The shutdown pin can start and stop the regulator.The shutdown mode set by this pin can stop the operation

of all internal circuits. The structure of the ON/OFF pin is shown in Fig. When the ON/OFF pin is not used,

connect it to the VIN pin.

ON/OFF Pin

Internal Circuits

VOUT Pin Voltage

Current Consumption

“L”: Power off

Stopped

GND level

ISS2

“H”: Power on

Operating

Set value

ISS1

LB1138BG-12-AF5-R Datasheet(PDF) 5 Page - Unisonic Technologies