AS1339_04 datasheet(3/26 Pages) AMSCO

Part #	AS1339

Description	650mA RF Step-Down DC-DC for PA, with two LDOs

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Manufacturer	AMSCO [ams AG]

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www.austriamicrosystems.com/DC-DC_Step-Down/AS1339

Revision 1.05

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AS1339

Datasheet - P i n o u t

4 Pinout

Figure 2. Pin Assignments (Top View)

Pin Description

Table 1. Pin Description

Pin Name

Pin Number

Description

NC

A1

Not Connected.

Free, high impedance for normal operation. Used for

internal test purpose.

AGND

A2

Low-Noise Analog Ground

REFIN

A3

DAC-Controlled Input.

Reference voltage for buck converter. The output of

the PA step-down converter is regulated to 2.5 x VREFIN. Bypass mode is

enabled when VIN

≤ 2.69V x VREFIN.

PGND

A4

Power Ground

for PA Step-Down Converter

LDO2

B1

10mA LDO Regulator 2 Output.

Connect LDO2 with a 0.1μF ceramic

capacitor as close as possible to LDO2 and AGND. LDO2 is internally pulled

down through a 100

Ω resistor when this regulator is disabled.

PA_EN

B2

PA Step-Down Converter Enable Input.

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.

EN2

B3

Enable Input for LDO2.

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.

LX

B4

Inductor Connection.

Connect an inductor from LX to the output of the PA

step-down converter.

NC

AGND

REFIN

PGND

A1

A2

A3

A4

LDO2

PA_EN

EN2

LX

B1

B2

B3

B4

IN2

TEST

IN1B

IN1A

C1

C2

C3

C4

LDO1

EN1

PAB

PAA

D1

D2

D3

D4

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