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AAT1157

AAT
Part Number AAT1157
Manufacturer AAT
Description DC/DC Converter
Published Apr 30, 2007
Detailed Description AAT1157 1MHz 1.2A Buck DC/DC Converter General Description The AAT1157 SwitchReg™ is a member of AnalogicTech's Total Po...
Datasheet PDF File AAT1157 PDF File

AAT1157
AAT1157

Overview
AAT1157 1MHz 1.
2A Buck DC/DC Converter General Description The AAT1157 SwitchReg™ is a member of AnalogicTech's Total Power Management IC™ (TPMIC™) product family.
The step-down switching converter is ideal for applications where fixed frequency and low ripple are required over the full range of load conditions.
The 2.
7V to 5.
5V input voltage range makes the AAT1157 ideal for singlecell lithium-ion/polymer battery applications.
Capable of up to 1.
2A with internal MOSFETs, the current-mode controlled IC provides high efficiency over a wide operating range.
Fully integrated compensation simplifies system design and lowers external parts count.
The device operates at a fixed 1MHz switching frequency across all load conditions.
The AAT1157 is available in the Pb-free, 16-pin 3x3mm QFN package and is rated over the -40°C to +85°C temperature range.
Features • • • • • • • • • • • • • • • • SwitchReg™ VIN Range: 2.
7V to 5.
5V Up to 95% Efficiency 110 mΩ RDS(ON) Internal Switches <1µA Shutdown Current 1MHz Buck Switching Frequency Fixed or Adjustable VOUT ≥ 0.
8V Integrated Power Switches Current Mode Operation Internal Compensation Stable with Ceramic Capacitors Constant PWM Operation for Low Output Ripple Internal Soft Start Over-Temperature Protection Current Limit Protection 16-Pin QFN 3x3mm Package -40°C to +85°C Temperature Range Applications www.
DataSheet4U.
com • • • • • • • HDD MP3 Players Notebook Computers PDAs Point-of-Load Regulation Set Top Boxes Smart Phones Wireless Notebook Adapters Typical Application 3.
3V 12 U1 AAT1157 VP VP VP EN VCC N/C N/C FB LX LX LX N/C PGND PGND 4 15 14 13 16 3 2 1 11 10 7 9 6 2.
5V R3 187k L1 3.
0µH R1 100 C1 10µF R4 59k C3-C4 2x 22µF C2 0.
1µF 8 5 SGND PGND 1157.
2005.
11.
1.
4 1 AAT1157 1MHz 1.
2A Buck DC/DC Converter Pin Descriptions Pin # 1, 2, 3 4 Symbol PGND FB Function Main power ground return pin.
Connect to the output and input capacitor return.
(See board layout rules.
) Feedback input pin.
This pin is connected t...


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