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| AAT2506 Datasheet, PDF (1/26 Pages) Advanced Analogic Technologies – 1MHz Step-Down Converter/LDO Regulator | |||
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AAT2506
1MHz Step-Down Converter/LDO Regulator
General Description
The AAT2506 is a member of AnalogicTech's Total
Power Management IC⢠(TPMICâ¢) product fam-
ily. It is a low dropout (LDO) linear regulator and a
step-down converter with an input voltage range of
2.7V to 5.5V, making it ideal for applications with
single lithium-ion/polymer batteries.
The LDO has an independent input and is capable
of delivering up to 300mA. 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 fea-
tures include low quiescent current and a low
dropout voltage.
The AAT2506 is available in either a fixed version
with internal feedback or a programmable version
with external feedback resistors. It can deliver
600mA of load current while maintaining a low
25µA no load quiescent current. The 1MHz switch-
ing frequency minimizes the size of external com-
ponents while keeping switching losses low. The
AAT2506 feedback and control delivers excellent
load regulation and transient response with a small
output inductor and capacitor.
The AAT2506 is designed to maintain high efficien-
cy throughout the operating range, which is critical
for portable applications.
The AAT2506 is available in a 12-pin TDFN33
package, and is rated over a temperature range of
-40°C to +85°C.
Features
SysPwrâ¢
⢠VIN Range: 2.7V to 5.5V
⢠VOUT Range: 0.6V to VIN
⢠300mA LDO Current Output
⢠400mV LDO Dropout Voltage at 300mA
⢠High Output Accuracy: ±1.5%
⢠Fast LDO Line / Load Transient Response
⢠600mA, 97% Efficiency Step-Down Converter
⢠Fast Turn-On Time (100µs Typical)
⢠25µA No Load Quiescent Current for Step-
Down Converter
⢠Shutdown Current <1µA
⢠Low RDS(ON) 0.4⦠Integrated Power Switches
⢠100% Duty Cycle Low Dropout Operation
⢠1MHz Switching Frequency
⢠100µs Typical Soft Start
⢠Over-Temperature Protection
⢠Current Limit Protection
⢠Available in 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 = 2.7V to 5.5V
C3
10µF
3.3V at 300mA
C4
2.2 µF
C5
10nF
3 VP
VCC 4
5 VLDO
EN 10
9 ENLDO
LX 2
6 OUT
FB 11
7 BYP
SGND 12
8 GND
PGND 1
U1
AAT2506
L1
4.7µH
C1
22µF
L1 Sumida CDRH3D16-4R7 C1 Murata GRM219R61A475KE19
C3 Murata GRM21BR60J106KE19
2506.2005.12.1.0
AAT2506 Step-Down Converter Efficiency
(VOUT = 2.5V; L = 10µH)
100
90
VIN = 3.3V
80
70
60
0.1
1
10
100
1000
Output Current (mA)
1
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