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Teilenummer | AAT2506 |
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Beschreibung | Step-Down Converter/LDO Regulator | |
Hersteller | AAT | |
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Gesamt 26 Seiten AAT2506
1MHz Step-Down Converter/LDO Regulator
General Description
Features
SysPwr™
The AAT2506 is a member of AnalogicTech's Total
Power Management IC™ (TPMIC™) product fam-
ily. It is a low dropout (LDO) linear regulator and a
• VIN Range: 2.7V to 5.5V
• VOUT Range: 0.6V to VIN
• 300mA LDO Current Output
step-down converter with an input voltage range of
• 400mV LDO Dropout Voltage at 300mA
2.7V to 5.5V, making it ideal for applications with
• High Output Accuracy: ±1.5%
single lithium-ion/polymer batteries.
• Fast LDO Line / Load Transient Response
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.
• 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) 0.4Ω Integrated Power Switches
• 100% Duty Cycle Low Dropout Operation
• 1MHz Switching Frequency
The AAT2506 is available in either a fixed version
• 100µs Typical Soft Start
with internal feedback or a programmable version
• Over-Temperature Protection
with external feedback resistors. It can deliver
• Current Limit Protection
600mA of load current while maintaining a low
• Available in TDFN33-12 Package
25µA no load quiescent current. The 1MHz switch-
• -40°C to +85°C Temperature Range
ing frequency minimizes the size of external com-
ponents while keeping switching losses low. The
AAT2506 feedback and control delivers excellentwww.DataSheet4U.com
load regulation and transient response with a small
Applications
output inductor and capacitor.
The AAT2506 is designed to maintain high efficien-
cy throughout the operating range, which is critical
for portable applications.
• Cellular Phones
• Digital Cameras
• Handheld Instruments
• Microprocessor/DSP Core/IO Power
The AAT2506 is available in a 12-pin TDFN33
• PDAs and Handheld Computers
package, and is rated over a temperature range of
• Portable Media Players
-40°C to +85°C.
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
Output Current (mA)
1000
1
AAT2506
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
LDO Dropout Voltage vs. Temperature
(EN = GND; ENLDO = VIN)
540
480 IL = 300mA
420
360
300
240 IL = 150mA
IL = 100mA
180
120
60
0
-40 -30 -20 -10 0
IL = 50mA
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (°C)
LDO Dropout Characteristics
(EN = GND; ENLDO = VIN)
3.20
3.00 IOUT = 0mA
2.80
2.60 IOUT = 300mA
IOUT = 150mA
2.40 IOUT = 100mA
2.20 IOUT = 10mA IOUT = 50mA
2.00
2.70 2.80 2.90 3.00 3.10 3.20 3.30
Input Voltage (V)
LDO Dropout Voltage vs. Output Current
(EN = GND; ENLDO = VIN)
500
450
400
350
300
250
200
150
100
50
0
0
85°C
25°C
-40°C
50 100 150 200 250 300
Output Current (mA)
LDO Ground Current vs. Input Voltage
(EN = GND; ENLDO = VIN)
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
IOUT=300mA
IOUT=0mA
IOUT=150mA
IOUT=50mA
IOUT=10mA
0.00
2 2.5 3 3.5 4 4.5
Input Voltage (V)
5
LDO Dropout Voltage vs. Temperature
(EN = GND; ENLDO = VIN)
540
480 IL = 300mA
420
360
300
240 IL = 150mA
IL = 100mA
180
120
60
0
-40 -30 -20 -10 0
IL = 50mA
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (°C)
LDO Initial Power-Up Response Time
(CBYP = 10nF; EN = GND; ENLDO = VIN)
VENLDO (5V/div)
VOUT (1V/div)
400µs/div
6 2506.2005.12.1.0
6 Page AAT2506
1MHz Step-Down Converter/LDO Regulator
Functional Block Diagram
VCC
VP
FB
See
Note
EN
SGND
VLDO
Error
Amp.
Voltage
Reference
Control
Logic
Error
Amp.
Logic
Over-Current
Protection
DH
DL
BYP
ENLDO
Fast Start
Control
Voltage
Reference
LX
PGND
OUT
GND
Note: Internal resistor divider included for ≥1.2V versions. For low voltage versions, the feedback pin is tied directly to the error
amplifier input.
12 2506.2005.12.1.0
12 Page | ||
Seiten | Gesamt 26 Seiten | |
PDF Download | [ AAT2506 Schematic.PDF ] |
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