APS1056 Datasheet, PDF (1/20 Pages) Advanced Analogic Technologies – Fast Transient 600mA Step-Down Converter

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
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
C2
4.7µF
U1
APS1056
VIN
LX
EN
GND
OUT
V_O
L1
4.7µH
C1
4.7µF
APS1056.2007.04.0.9 (PRELIMINARY INFORMATION)
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