Copyright

© ANPEC Electronics Corp.

Rev. A.5 - Jan., 2018

www.anpec.com.tw

1

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and

advise customers to obtain the latest version of relevant information to verify before placing orders.

Boost and Dual LDOs with POK

APW7251/A

Features

General Description

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Wide Input Voltage from 3V to 5.5V

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Built-in Soft-start

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B o os t Con ve r t e r F i xe d O u tp u t Vo l t a g e:

APW7251:13.5V

APW7251A:12.3V

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<1uA Quiescent Current During Shutdown

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Boost Converter in PFM Mode

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Internal Switch Current Limit : 250 mA

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High Efficiency at 3.3V to 18V/10mA

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Dual LDOs With POK

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High PSRR: 70dB at 1KHz

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Low Dropout Voltage:

- 450mV at 150mA (LDO1_1.8V)

- 100mV at 150mA (LDO2_3.3V)

- 100mV at 150mA (LDO2_3.2V_APW7251A)

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2x2mm TQFN-12 Packages

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Lead Free and Green Devices Available (RoHS

Compliant)

Applications

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Touch Panel

The APW7251 contains a PWM Boost converter, a 1.8V

linear regulator and a 3.3V linear regulator.

The PWM boost converter is a high frequency step-up

DC/DC converter. Its output voltage is set by an internal

feedback divider at 13.5V and 12.3V.

The regulator is a P-channel low dropout linear regulator

with POK which needs only one input voltage from 3 to 5.

5V, and delivers current up to 10mA to set output voltage.

Typical dropout voltage is 450mV at 150mA loading for 1.

8V output, and 100mV at 150mA loading for 3.3V output.

The APW7251 has power-on-reset and soft start func-

tions to prevent wrong operation and limit the surge cur-

rent during power-on or start-up. It also has thermal shut-

down function to protect the device against over-

temperature.

Simplified Application Circuit

EN_PWM

EN_LDO

PGND GND

LDO 2

POK

VOUT

LX

LDO 1

VIN_L

VIN_P

Pin Configuration

LX

PGND

Bottom View

2

GND

3

1

8

7

9

5

4

6

11

12

10

VIN_P

VIN_L

LDO2

LDO1