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AAT1156 Datasheet, PDF (1/14 Pages) Advanced Analogic Technologies – 1MHz 700mA Step-Down DC-DC Converter | |||
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AAT1156
1MHz 700mA Step-Down DC-DC Converter
General Description
The AAT1156 SwitchReg⢠is a member of
AnalogicTechâ¢'s Total Power Management ICâ¢
(TPMICâ¢) product family. The step-down switching
converter is ideal for applications where high effi-
ciency is required over the full range of load condi-
tions. 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 the 16-pin 3x3mm
QFN package and is rated over the -40°C to +85°C
temperature range.
Features
SwitchRegâ¢
⢠VIN Range: 2.7 to 5.5 Volts
⢠Up to 95% Efficiency
⢠110m⦠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
12 VP
FB 4
11 VP
LX 15
10 VP
LX 14
7 EN
LX 13
9 VCC
NC 16
6 LL
PGND 3
8 NC
PGND 2
5 SGND PGND 1
L1
4.7µH
R4
59k
2.5V
R3
187k
C3, C4
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
AAT1156 Efficiency
(VOUT = 2.5V; L = 4.7µH; CDRH3D16)
100
95 VIN = 3.0V
90
85
80
VIN = 4.2V
75
VIN = 3.6V
70
65
60
55
50
1
10
100
1000
Output Current (mA)
1156.2005.11.1.2
1
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