DATA SHEET
AAT2505
Dual Channel, Step-Down Converter/Linear Regulator
Features
General Description
•
•
The AAT2505 is a member of Skyworks' Total Power
Management IC (TPMIC™) product family. It is a low
dropout (LDO) linear regulator and a step-down con-
verter with an input voltage range of 2.7V to 5.5V, mak-
ing it ideal for applications with single cell lithium-ion /
polymer batteries.
VIN Range: 2.7V to 5.5V
300mA LDO
400mV Dropout Voltage at 300mA
High Accuracy: ±1.5%
Fast Line / Load Transient Response
Power OK Output
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600mA Step-Down Converter
The LDO has an independent input pin and is capable of
delivering up to 300mA of current. The linear regulator
has been designed for high-speed turn-on and turn-off
performance, fast transient response, and good power
supply rejection ratio (PSRR). Other features include low
quiescent current, low dropout voltage, and a Power-OK
(POK) open drain output signaling when VOUT is in regula-
tion.
Up To 98% Efficiency
27μA No Load Quiescent Current
Shutdown Current <1μA
Low RDS(ON) Integrated Power Switches
Fast Turn-On Time (150μs Typical)
Low Dropout 100% Duty Cycle
1.4MHz Switching Frequency
Internal Soft Start
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The 600mA step-down converter is designed to operate
with 1.4MHz of switching frequency, minimizing external
component size and cost while maintaining a low 27μA
no load quiescent current.
Over-Temperature and Current Limit Protection
TDFN33-12 Package
-40°C to +85°C Temperature Range
Peak current mode control with internal compensation
provides a stable converter with a low equivalent series
resistance (ESR) ceramic output capacitor for extremely
low output ripple.
Applications
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•
•
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Cellular Phones
Digital Cameras
Handheld Instruments
Microprocessor/DSP Core/IO Power
PDAs and Handheld Computers
Portable Media Players
For maximum battery life with high voltage outputs, the
step-down converter duty cycle increases to 100%. The
output voltage is either fixed or adjustable with an inte-
grated P- and N-channel MOSFET power stage and
1.4MHz switching frequency.
The AAT2505 is available in a Pb-free, 12-pin TDFN33
package and is rated over a temperature range of -40°C
to +85°C.
Typical Application
VIN = 2.7V to 5.5V
Efficiency
(VOUT = 2.5V; L = 6.8µH)
C3
10μF
3
5
9
6
7
8
4
VP
VCC
EN
100
90
2.5V at 600mA
10
2
VLDO
ENLDO
OUT
POK
GND
U1
L1
3.3V at 300mA
LX
6.8μH
11
12
1
FB
VIN = 3.3V
R3 100kΩ
80
SGND
PGND
C1
4.7μF
C4
2.2μF
70
AAT2505
60
0.1
1
10
100
1000
L1 Sumida CDRH3D16-4R7 C1 Murata GRM219R61A475KE19
C3 Murata GRM21BR60J106KE19
Output Current (mA)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
1
202018B
• Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
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