AS1332 Datasheet, PDF (1/19 Pages) ams AG – 650mA, Step-Down DC-DC Converter for RF Power Amplifiers

AS1332
Datasheet
650mA, Step-Down DC-DC Converter for RF Power Amplifiers
1 General Description
The AS1332 is a step-down DC-DC converter designed
to power radiofrequency (RF) power amplifiers (PAs)
from a single Li-Ion battery. The device also achieves
high-performance in mobile phones and similar RF PA
applications.
The AS1332 steps down an input voltage of 2.7V to 5.5V
to output voltages ranging from 1.3V to 3.16V. Using a
V_CON analog input, the output voltage is set for
controlling power levels and efficiency of the RF PA.
The RF interferences are minimized due to the fixed-
frequency PWM operation. The battery consumption is
reduced to 0.01µA (typ.) during shutdown.
Because of the high switching frequencies (2 MHz) tiny
surface-mount components can be used. Additional to
the small size the amount is also small. Only three
external components are required, an inductor and two
ceramic capacitors.
The AS1332 is available in a 8-pin WL-CSP.
2 Key Features
! PWM Switching Frequency: 2MHz
! Single Lithium-Ion Cell Operation (2.7V to 5.5V)
! Dynamic Programmable Output Voltage (1.3V to
3.16V)
! Maximum load capability of 650mA
! High Efficiency (96% Typ at 3.6VIN, 3.16VOUT at
400mA) from internal synchronous rectification
! Current Overload Protection
! Thermal Overload Protection
! Soft Start
! 8-pin WL-CSP
3 Applications
The AS1332 is an ideal solution for cellular phones,
hand-held radios, RF PC cards, and battery powered RF
devices.
Figure 1. Typical Application Circuit
VIN
2.7V to 5.5V
10 µF
EN
VCON
0.52V to 1.27V
PVIN
VDD
AS1332
3.3 µH
SW
FB
4.7 µF
VOUT
1.3V to 3.16V
VOUT = 2.5 x VCON
VCON
PGND
AGND
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