AAT1156 データシートの表示（PDF） - Advanced Analogic Technologies
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AAT1156 Datasheet PDF : 15 Pages
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AAT1156
1MHz 700mA Step-Down DC-DC Converter
General Description
The AAT1156 SwitchReg is a step-down switching
converter ideal for applications where high efficien-
cy is required over the full range of load conditions.
The 2.7V to 5.5V input voltage range makes the
AAT1156 ideal for single-cell lithium-ion/polymer
battery applications. Capable of more than 700mA
with internal MOSFETs, the current-mode con-
trolled IC provides high efficiency over a wide oper-
ating range. Fully integrated compensation simpli-
fies system design and lowers external parts count.
The AAT1156 is available in a 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
• 110mΩ RDS(ON) Internal Switches
• <1μA Shutdown Current
• 1MHz Step-Down Switching Frequency
• Fixed or Adjustable VOUT ≥ 0.8V
• Integrated Power Switches
• Current Mode Operation
• Internal Compensation
• Stable with Ceramic Capacitors
• Internal Soft Start
• Over-Temperature Protection
• Current Limit Protection
• 16-Pin QFN 3x3mm Package
• -40°C to +85°C Temperature Range
Applications
• Cellular Phones
• Digital Cameras
• MP3 Players
• Notebook Computers
• PDAs
• Wireless Notebook Adapters
Typical Application
INPUT
R1
100
C1
10μF
C2
0.1 μF
U1
AAT1156
VP
FB
VP
LX
VP
LX
EN
LX
VCC
NC
LL
PGND
NC PGND
SGND PGND
L1
4.7μH
2.5V
R3
187k
R4
C3, C4
59k
2 x 22μF
C1 Murata 10μF 6.3V X5R GRM42-6X5R106K6.3
C3-C4 MuRata 22μF 6.3V GRM21BR60J226ME39L X5R 0805
L1 Sumida CDRH3D16-4R7NC
Efficiency vs. Load Current
(VOUT = 2.5V; L = 4.7µH)
100
95 VIN = 3.0V
90
85
80
VIN = 4.2V
75
VIN = 3.6V
70
65
60
55
50
1
10
100
Output Current (mA)
1000
1156.2007.01.1.4
1
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