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AAT2511
Dual 600mA, 1MHz Step-Down DC/DC Converter
2511.2006.05.1.4
1
SystemPower
General Description
The AAT2511 is a member of AnalogicTech's Total
Power Management IC™ (TPMIC™) product fam-
ily. It is comprised of two 1MHz step-down con-
verters designed to minimize external component
size and cost. The input voltage ranges from 2.7V
to 5.5V. The output voltage ranges from 0.6V to the
maximum applied input voltage and is externally
adjustable.
Peak current mode control with internal compensa-
tion provides a stable converter with low ESR ceram-
ic output capacitors for extremely low output ripple.
Each channel has a low 25µA quiescent operating
current, which is critical for maintaining high effi-
ciency at light load.
For maximum battery life, each converter's high-
side P-channel MOSFET conducts continuously
when the input voltage approaches dropout (100%
duty cycle operation).
Both regulators have independent input and
enable inputs.
The AAT2511 is available in a Pb-free, thermally-
enhanced 12-pin TDFN33 package, and is rated
over the -40°C to +85°C temperature range.
Features
Up to 97% Efficiency
25µA Quiescent Current Per Channel
•VIN Range: 2.7V to 5.5V
•VOUT Range: 0.6V to VIN
Output Current: 600mA
Low RDS(ON) 0.4Ω Integrated Power Switches
Low Drop Out 100% Duty Cycle
1.0MHz Switching Frequency
Shutdown Current <1µA
Current Mode Operation
Internal Reference Soft Start
Short-Circuit Protection
Fast Turn-On (100µs Typical)
Over-Temperature Protection
3mm x 3mm, < 1mm high
TDFN33-12 Package
-40°C to +85°C Temperature Range
Applications
Cellular Phones
Digital Cameras
Handheld Instruments
Microprocessor/DSP Core/IO Power
PDAs and Handheld Computers
Portable Media Players
Typical Application
AAT2511 Efficiency
(VIN = 3.3V)
Load Current (mA)
60
65
70
75
80
85
90
95
100
0.1
1
10
100
1000
2.5V
1.8V
4.7
μH
L1
10
μF
C1
1.8V
118k
R1
59.0k
R2
10
μH
L2
10
μF
C2
2.5V
59.0k
R4
10
μF
C3
VIN
187k
R3
FB1
2
EN1
1
LX1
11
GND2
7
LX2
8
GND1
10
SGND1
3
VIN1
12
VIN2
9
SGND2
6
FB2
5
EN2
4
AAT2511
U1
0.1
μF
C8


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