AAT2749 Datasheet, PDF (2/17 Pages) Skyworks Solutions Inc. – 3.0MHz Step-Down Converter and Low-V in LDO

DATA SHEET
AAT2749
Pin Descriptions
3.0MHz Step-Down Converter and Low-V_IN LDO
Pin #
1
2
3
4
5, 9
6
7
8
Symbol
IN_LDO
OUT_LDO
OUT_BUCK
MODE
GND
CE
IN_BUCK
LX
Description
Input supply voltage for the LDO regulator. May be connected to output of step-down regulator.
LDO power output.
Step-down converter output voltage feedback pin.
Mode pin. To force the buck converter into fixed frequency, PWM mode pull the MODE pin high.
Ground pin.
Chip enable; Logic High enables step-down converter and LDO.
Input supply voltage for the step-down converter.
Switching node. Connect the inductor to this pin. It is internally connected to the drain of both high-
and low-side MOSFETs.
Pin Configuration
WLCSP-9
(Top View)
GND ^{9 8 7} IN_BUCK
CE
OUT_BUCK
6
5
4
GND
3
2
1
MODE
IN_LDO
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
2
202037A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012