AS1339
Datasheet - P i n o u t
4 Pinout
Figure 2. Pin Assignments (Top View)
NC
A1
LDO2
B1
IN2
C1
LDO1
D1
AGND
A2
PA_EN
B2
TEST
C2
EN1
D2
REFIN
A3
EN2
B3
IN1B
C3
PAB
D3
PGND
A4
LX
B4
IN1A
C4
PAA
D4
Pin Description
Table 1. Pin Description
Pin Name
NC
AGND
REFIN
PGND
LDO2
Pin Number
A1
A2
A3
A4
B1
Description
Not Connected.
Free, high impedance for normal operation. Used for
internal test purpose.
Low-Noise Analog Ground
DAC-Controlled Input.
Reference voltage for buck converter. The output of
the PA step-down converter is regulated to 2.5 x V
REFIN
. Bypass mode is
enabled when V
IN
≤
2.69V x V
REFIN
.
Power Ground
for PA Step-Down Converter
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 100Ω resistor when this regulator is disabled.
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 110kΩ resistor.
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 110kΩ resistor.
Inductor Connection.
Connect an inductor from LX to the output of the PA
step-down converter.
PA_EN
B2
EN2
LX
B3
B4
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