PRODUCT DATASHEET
AAT1217
SwitchReg
TM
General Description
The AAT1217 is a high efficiency, synchronous, fixed
frequency, step-up converter designed for single-cell or
dual-cell alkaline, NiMH, or NiCd battery-powered appli-
cations. The high 1.2MHz switching frequency and com-
pletely integrated control circuitry minimize the total
solution footprint area while maintaining excellent regu-
lation, ripple, and transient response throughout the full
load range.
Light load mode operation and low quiescent current
allow the AAT1217 to maintain high efficiency perfor-
mance for light load conditions. With a 1.2A peak induc-
tor current limit, the AAT1217 is capable of delivering
100mA to the load from a single AA cell, 400mA from
dual AA cells, or up to 500mA from a single-cell lithium-
ion battery. The AAT1217 has a 0.85V start-up voltage
with operation down to 0.5V.
The AAT1217 is available in a Pb-free, space-saving low
profile (1mm) 6-pin TSOT23 or 6-pin SOT23 package
and is rated over the -40°C to +85°C ambient tempera-
ture range.
600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
Features
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V
IN
Operation Range: 0.5V to V
OUT
V
OUT
Range: 2.5V to 5.5V
100mA Output from a Single AA Cell Input
400mA Output from a Dual AA Cell Input
500mA Output from a Single Li+ Cell Input
High Efficiency: Up to 93% Efficiency
Low Start-Up Voltage: 0.85V Typical
Internal Synchronous Rectifier
▪
V
OUT
≤
4.5V: No External Schottky Diode
Fixed Frequency Pulse Width Modulation (PWM) Current-
Mode Control Scheme with Internal Compensation
1.2MHz Fixed Switching Frequency
1.2A Current Limit
Light Load Mode Operation
Over-Current Protection
EMI Reduction Anti-Ringing Control Circuitry
Low Shutdown Current: <1.0μA
-40°C to +85°C Ambient Temperature Range
Low Profile (1mm) TSOT23-6 or SOT23-6 Package
Applications
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Cellular and Smart Phones
Digital Still and Video Cameras
Microprocessors and DSP Core Supplies
MP3 Player
Portable Instruments
Wireless and DSL Modems
Typical Application
L1
4.7μH
L1
4.7μH
V
IN
0.85V
VIN
R3
1MΩ
SW
VOUT
V
OUT
3.3V,100 mA
C
OUT
4.7μF
V
IN
0.85V
SW
VIN
VOUT
V
OUT
3.3V, 100 mA
C
IN
4.7μF
AAT1217-1.2
SHDN
GND
FB
R1
1.02M
R2
604k
C
IN
4.7μF
R3
1MΩ
AAT1217-3.3
SHDN
GND
FB
C
OUT
4.7μF
1217.2008.03.1.3
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