AAT2510
Dual 400mA, 1MHz Step-Down DC-DC Converter
General Description
The AAT2510 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 either fixed
or 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 AAT2510 is available in a thermally-enhanced
12-pin TDFN33 package, and is rated over the -40°C
to +85°C temperature range.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
SysPwr
™
Up to 96% Efficiency
25µA Quiescent Current Per Channel
V
IN
Range: 2.7V to 5.5V
Fixed V
OUT
Range: 0.6V to V
IN
Adjustable V
OUT
Range: 0.6V to 2.5V
Output Current: 400mA
Low R
DS(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
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
V
IN
= 2.7 - 5.5V
C3
10µF
12
1
AAT2510 Efficiency
U1
AAT2510
VIN1
EN1
LX1
FB1
VIN2
EN2
LX2
FB2
9
4
8
5
6
7
C8
0.1µF
100
95
2.5V at 400mA
L1
4.7µH
11
2
3
L2
4.7µH
1.8V at 400mA
Efficiency (%)
90
85
80
75
70
65
60
0.1
1
V
IN
= 3.3V with unloaded output disabled
10
100
1000
2.5V
1.8V
C1
4.7µF
SGND1 SGND2
GND1
GND2
10
C2
4.7µF
L1,L2 Sumida CDRH3D16-4R7 C1,C2 Murata GRM219R61A475KE19
C3 Murata GRM21BR60J106KE19
Load Current (mA)
2510.2005.08.1.5
1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
