AAT1156 Datasheet, PDF (1/14 Pages) Advanced Analogic Technologies – 1MHz 700mA Step-Down DC-DC Converter

AAT1156
1MHz 700mA Step-Down DC-DC Converter
General Description
The AAT1156 SwitchReg™ is a member of
AnalogicTech™'s Total Power Management IC™
(TPMIC™) 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
SwitchReg^™
• V_IN Range: 2.7 to 5.5 Volts
• Up to 95% Efficiency
• 110mΩ R_DS(ON) Internal Switches
• <1µA Shutdown Current
• 1MHz Step-Down Switching Frequency
• Fixed or Adjustable V_OUT ≥ 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
(V_OUT = 2.5V; L = 4.7µH; CDRH3D16)
100
95 _{VIN = 3.0V}
90
85
80
V_IN = 4.2V
75
V_IN = 3.6V
70
65
60
55
50
1
10
100
1000
Output Current (mA)
1156.2005.11.1.2
1