APS1056
Fast Transient 600mA Step-Down Converter
General Description
The APS1056 SwitchReg is a member of
AnalogicTech's Total Power Management IC™
(TPMIC™) product family. It is a 1.4MHz step-
down converter with an input voltage range of 2.7V
to 5.5V and output voltage as low as 0.6V. It is opti-
mized to react quickly to a load variation.
The APS1056 is available in fixed voltage versions
with internal feedback and a programmable ver-
sion with external feedback resistors. It can deliver
600mA of load current while maintaining a low
27µA no load quiescent current. The 1.4MHz
switching frequency minimizes the size of external
components while keeping switching losses low.
The APS1056 is designed to maintain high effi-
ciency throughout the operating range, which is
critical for portable applications.
The APS1056 is available in a Pb-free SOT23-5
package and is rated over the -40°C to +85°C tem-
perature range.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
SwitchReg
™
V
IN
Range: 2.7V to 5.5V
V
OUT
Fixed or Adjustable from 0.6V to V
IN
27µA No Load Quiescent Current
Up to 98% Efficiency
600mA Max Output Current
1.4MHz Switching Frequency
120µs Soft Start
Fast Load Transient
Over-Temperature Protection
Current Limit Protection
100% Duty Cycle Low-Dropout Operation
<1µA Shutdown Current
SOT23-5 Package
Temperature Range: -40°C to +85°C
Preliminary Information
Applications
•
•
•
•
•
•
Cellular Phones
Digital Cameras
Handheld Instruments
Microprocessor / DSP Core / IO Power
PDAs and Handheld Computers
USB Devices
Typical Application (Fixed Output Voltage)
V
IN
V
O
U1
APS1056
L1
LX
4.7µH
VIN
C2
4.7µF
EN
GND
OUT
C1
4.7µF
APS1056.2007.04.0.9 (PRELIMINARY INFORMATION)
1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
