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AAT1171 Datasheet(PDF) 2 Page - Advanced Analogic Technologies

Part No. AAT1171
Description  600mA Voltage-Scaling Step-Down Converter for RF Power Amplifiers with Bypass Switch
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Maker  ANALOGICTECH [Advanced Analogic Technologies]
Homepage  http://www.analogictech.com
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AAT1171 Datasheet(HTML) 2 Page - Advanced Analogic Technologies

 
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Pin Descriptions
Pin Configuration
TDFN33-12
(Top View)
N/C
VOUT
VOUT
1
VCC
AGND
DAC
LX
PGND
VIN
MODE/SYNC
BYPASS
EN
2
3
4
5
6
12
11
10
9
8
7
Pin #
Symbol
Function
1
N/C
Not connected.
2, 3
VOUT
Feedback input pin. This pin is connected to the converter output. It is used to complete
the control loop, regulating the output voltage to the desired value. When in bypass
mode, a low resistance MOSFET is connected between this pin and VIN.
4
VCC
Bias supply. Supply power for the internal circuitry. Connect to input power via low pass
filter with decoupling to AGND.
5
AGND
Analog ground. Connect the return of all small signal components to this pin.
6
DAC
Control voltage input from a DAC. Input voltage between 0.2V and 1.2V to control output
voltage of the converter. Force pin to 1.3V for bypass switch enable.
7
EN
Enable DC/DC converter, active high.
8
BYPASS
Enable control to bypass the DC/DC converter when PA transmitting at full power from
low battery voltage. Active high.
9
MODE/SYNC
This pin is used to program the device between PWM and LL mode:
HIGH - PWM Mode Only
LOW - LL Mode: PWM operation for loads above 100mA and variable switching frequen-
cy for loads below 100mA
Connecting the SYNC pin to the system clock (19.8MHz) will override the internal clock
and force the switching frequency to the external clock frequency divided by 10.
10
VIN
Input supply voltage for the converter. Must be closely decoupled.
11
PGND
Main power ground. Connect to the output and input capacitor return.
12
LX
Switching node. Connect the inductor to this pin. It is connected internally to the drain of
both low- and high-side MOSFETs.
EP
Exposed paddle (bottom). Connect to ground directly beneath the package.
AAT1171
600mA Voltage-Scaling Step-Down Converter
for RF Power Amplifiers with Bypass Switch
2
1171.2006.06.1.0


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