AS1339 datasheet(3/25 Pages) AMSCO

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AS1339

Datasheet - P i n o u t

IN2

Supply Voltage Input for LDO1 and LDO2.

Connect IN2 to a battery or

supply voltage from 2.7V to 5.5V. Decouple IN2 with a 1μF ceramic

capacitor as close as possible to IN2 and AGND. Connect IN2 to the same

source as IN1A and IN1B.

TEST

NC.

Used for internal test purpose. The pin is internally pulled down with a

110k

Ω resistor.

IN1B, IN1A

C3, C4

Supply Voltage Input for PA Step-Down Converter.

Connect IN1A/B to a

battery or supply voltage from 2.7V to 5.5V. Decouple IN1A/B with a 10μF

ceramic capacitor as close as possible to IN1A/B, and PGND. IN1A and

IN1B are internally connected together. Connect IN1A/B to the same source

as IN2.

LDO1

10mA LDO Regulator 1 Output.

Decouple LDO1 with a 0.1μF ceramic

capacitor as close as possible to LDO1 and AGND. LDO1 is internally pulled

down through a 100

Ω resistor when this regulator is disabled.

EN1

Enable Input for LDO1.

For normal operation, connect to logic-high. For

shutdown mode, connect to logic-low. The pin is internally pulled down

through a 110k

Ω resistor.

PAB, PAA

D3, D4

PA Connection for Bypass Mode.

Internally connected to IN1A/B using

the internal bypass MOSFET during bypass mode. Connect PAA/B with a

4.7μF ceramic capacitor as close as possible to PAA/B and PGND.

Table 1. Pin Description

Pin Name

Pin Number

Description

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