AAT2511 Datasheet, PDF (1/20 Pages) Advanced Analogic Technologies – Dual 600mA, 1MHz Step-Down DC/DC Converter

AAT2511
Dual 600mA, 1MHz Step-Down DC/DC Converter
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
SystemPower^™
• Up to 97% Efficiency
• 25µA Quiescent Current Per Channel
• V_IN Range: 2.7V to 5.5V
• V_OUT Range: 0.6V to V_IN
• Output Current: 600mA
• 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
• 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
VIN
C3
10µF
1.8V
C1
10µF
L1
4.7µH
R1
118k
R2
59.0k
U1
AAT2511
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
2.5V
L2
10µH
R4
59.0k
R3
187k
C2
10µF
100
95
90
85 ^2.5V
80
75
70
65
60
0.1
AAT2511 Efficiency
(V_IN = 3.3V)
1.8V
1
10
100
Load Current (mA)
1000
2511.2006.02.1.2
1