AAT2510 Datasheet, PDF (1/20 Pages) Advanced Analogic Technologies – Dual 400mA, 1MHz Step-Down DC-DC Converter

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
VIN = 2.7 - 5.5V
C3
10µF
2.5V at 400mA _L1
4.7µH
C1
4.7µF
U1
AAT2510
12
VIN1
9
VIN2
1
EN1
4
EN2
11
LX1
8
LX2
2
FB1
5
FB2
3
6
SGND1 SGND2
10
GND1
7
GND2
C8
0.1µF
1.8V at 400mA
L2
4.7µH
C2
4.7µF
L1,L2 Sumida CDRH3D16-4R7 C1,C2 Murata GRM219R61A475KE19
C3 Murata GRM21BR60J106KE19
AAT2510 Efficiency
100
95
90
85 ^2.5V
80
75
70
65
60
0.1
1.8V
1
V_IN = 3.3V with unloaded output disabled
10
100
1000
Load Current (mA)
2510.2005.08.1.5
1