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SD3112-4R7-R Folha de dados(PDF) 2 Page - Skyworks Solutions Inc.

Nome de Peças SD3112-4R7-R
Descrição Electrónicos  600mA Voltage-Scaling Step-Down Converter for RF Power Amplifiers with Bypass Switch
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Fabricante Electrônico  SKYWORKS [Skyworks Solutions Inc.]
Página de início  http://www.skyworksinc.com
Logo SKYWORKS - Skyworks Solutions Inc.

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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201999B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013
AAT1171
600mA Voltage-Scaling Step-Down Converter
for RF Power Amplifiers with Bypass Switch
DATA SHEET
Pin Descriptions
Pin #
Symbol
Function
TDFN33-12
WLCSP-12
1
N/A
N/C
Not connected.
2, 3
5, 9
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
7
VCC
Bias supply. Supply power for the internal circuitry. Connect to input power via
low pass filter with decoupling to AGND.
5
6
AGND
Analog ground. Connect the return of all small signal components to this pin.
6
1
DAC
Control voltage input from a DAC. Input voltage between 0.2V and 1.2V to con-
trol output voltage of the converter. Force pin to 1.3V for bypass switch enable.
7
2
EN
Enable DC/DC converter, active high.
8
3
BYPASS
Enable control to bypass the DC/DC converter when PA transmitting at full
power from low battery voltage. Active high.
9
4
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
frequency 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
12
VIN
Input supply voltage for the converter. Must be closely decoupled.
11
8, 11
PGND
Main power ground. Connect to the output and input capacitor return.
12
10
LX
Switching node. Connect the inductor to this pin. It is connected internally to
the drain of both low- and high-side MOSFETs.
EP
N/A
Exposed paddle (bottom). Connect to ground directly beneath the package.
Pin Configuration
TDFN33-12
WLCSP-5
(Top View)
(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
12
11
10
7
8
9
6
5
4
1
2
3
VIN
VCC
AGND
DAC
5: VOUT
2: EN
11: PGND
8: PGND
LX
VOUT
MODE/SYNC
BYPASS


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