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PDF AAT2506 Data sheet ( Hoja de datos )
| Número de pieza | AAT2506 | |
| Descripción | Step-Down Converter/LDO Regulator | |
| Fabricantes | AAT | |
| Logotipo |  |
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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
1 page  
AAT2506
1MHz Step-Down Converter/LDO Regulator
Electrical Characteristics1
Symbol Description
Conditions
Buck Converter Typical values are TA = 25°C, VIN = VCC = Vp = 3.6V.
VIN Input Voltage
VIN Rising
VUVLO
UVLO Threshold
Hysteresis
VIN Falling
VOUT
Output Voltage Tolerance
IOUT = 0 to 400mA,
VIN = 2.7V to 5.5V
VOUT
Output Voltage Range
Fixed Output Version
IQBUCK
Step-Down Converter
Quiescent Current
ENLDO = GND, No Load,
0.6V Adjustable Model
ISHDN
ILIM
RDS(ON)H
Shutdown Current
P-Channel Current Limit
High Side Switch On
Resistance
EN = SGND = PGND, ENLDO = GND
RDS(ON)L
Low Side Switch On
Resistance
ILXLK
LX Leakage Current
VIN = 5.5V, VLX = 0 - VIN
EN = SGND = PGND
ILXLK, R
LX Reverse Leakage Current VIN = Open, VLX = 5.5V,
(fixed)
EN = SGND = PGND
VLinereg
VFB
Line Regulation
FB Threshold Voltage
Accuracy
VIN = 2.7V to 5.5V
0.6V Output, No Load, TA = 25°C
IFB
FOSC
TS
TSD
FB Leakage Current
Oscillator Frequency
Start-Up Time
Over-Temperature Shutdown
Threshold
0.6V Output
TA = 25°C
From Enable to Output Regulation
THYS
Over-Temperature Shutdown
Hysteresis
Logic Signals
VEN(L)
VEN(H)
IEN(H)
Enable Threshold Low
Enable Threshold High
Leakage Current
Min Typ Max Units
2.7 5.5
2.6
100
1.8
-3.5 +3.5
0.6 4.0
25 50
1.0
600
0.45
V
V
mV
V
%
V
µA
µA
mA
Ω
0.40 Ω
1.0 µA
1.0 µA
0.5 %/V
591 600 609 mV
0.2
0.7 1.0 1.5
100
µA
MHz
µs
140 °C
15 °C
0.6 V
1.5 V
1.0 1.0 µA
1. The AAT2506 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
2506.2005.12.1.0
5
5 Page 
AAT2506
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Step-Down Converter Soft Start
(VIN = 3.6V; VOUT = 1.5V; L = 4.7µH; ENLDO = GND)
4.0 3.5
3.0 3.0
2.0 2.5
1.0 2.0
0.0 1.5
-1.0 1.0
-2.0 0.5
-3.0 0.0
-4.0 -0.5
Time (50µs/div)
Step-Down Converter Output Ripple
(VIN = 3.6V; VOUT = 1.8V; 400mA;
EN = VIN; ENLDO = GND)
40 0.9
20 0.8
0 0.7
-20 0.6
-40 0.5
-60 0.4
-80 0.3
-100
0.2
-120
0.1
Time (250ns/div)
2506.2005.12.1.0
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet AAT2506.PDF ] | |
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