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PDF AAT2503 Data sheet ( Hoja de datos )
| Número de pieza | AAT2503 | |
| Descripción | Adjustable 3-Channel Regulator | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT2503
Adjustable 3-Channel Regulator
General Description
Features
SystemPower™
The AAT2503 is a three-channel regulator consist-
ing of a step-down converter with an input voltage
range of 2.7V to 5.5V plus two low dropout (LDO)
linear regulators.
The step-down converter optimizes power efficien-
cy throughout the load range. Pulling the MODE/
SYNC pin high enables "PWM Only" mode, main-
taining constant frequency and low output ripple
across the operating range. Alternatively, the con-
verter may be synchronized to an external clock
input to the MODE/SYNC pin. The step-down con-
verter delivers up to 800mA of output current, while
consuming 30µA of typical no load quiescent cur-
rent. The switching frequency is 2MHz, minimizing
the size of external components.
• 800mA Step-Down Converter
— VIN Range: 2.7V to 5.5V
— VOUT Range: 0.9V to VIN
— High Efficiency
— 2MHz Switching Frequency
• Two 150mA Low Dropout Regulators
— VOUT Range: 0.6V to VIN
— High Output Accuracy: ±1.5%
• 85µA of Total IQ
• Independent Enable Pins
• Integrated Power MOSFETs
• Over-Temperature and Current Limit
Protection
• QFN34-20 Package
• -40°C to +85°C Temperature Range
The two LDOs (LDOA/LDOB) have independent
inputs and are capable of delivering up to 150mA
each. A Power-OK (POK) function provides an
open drain output signal when LDOA is within reg-
Applications
ulation. Both LDOs feature low quiescent current
and a low dropout voltage. The output voltageswwfwo.DrataSheet4U.com
both LDOs are adjustable to as low as 0.6V. The
linear regulators have independent Enable pins.
•
•
•
•
Cellular Phones
Digital Cameras
Handheld Instruments
Microprocessor/DSP Core/IO Power
The AAT2503 is available in a Pb-free 3x4mm
• PDAs and Handheld Computers
QFN34-20 package and is rated over the -40°C to
+85°C temperature range.
Typical Application
LX
AAT2503 FB
L1
VOUT (Buck)
VIN VIN OUTA
R1
VLDOA
R3
100kΩ
R4 OUTA
C2
10μF
POK
POK
VLDOB
FBA
VP OUTB
MODE/SYNC
ENA
ENB
FBB
PGND
R5
R8
OUTB
C6
2.2μF
R7
C5
2.2μF
R2
EN AGND
2503.2007.04.1.1
1
1 page  
AAT2503
Adjustable 3-Channel Regulator
Electrical Characteristics (continued)1
VIN = 3.6V; TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol Description
Step-Down Converter; IOUT = 800mA
VIN Input Voltage
UVLO
Under-Voltage Lockout Voltage
VOUT
VOUT
VFB
ISHDN
ILX_LEAK
IFB
ILIM
RDS(ON)H
RDS(ON)L
ΔVOUT/VOUT
ΔVOUT/
VOUT*ΔVIN
FOSC
TSD
THYS
VEN(L)
VEN(H)
IEN
VMODE/SYNC(L)
Output Voltage Tolerance
VOUT Programmable Range
Feedback Threshold Voltage
Shutdown Current
LX Leakage Current
Feedback Leakage
Current Limit
High Side Switch On Resistance
Low Side Switch On Resistance
Load Regulation
Line Regulation
Oscillator Frequency
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
Enable Threshold Low
Enable Threshold High
EN Input Leakage
Enable Threshold Low
Conditions
VIN Rising
Hysteresis
VIN Falling
IOUT = 0 to 800mA;
VIN = 2.7V to 5.5V
EN = GND
VIN = 5.5, VLX = 0 to VIN
VFB = 1.0V
ILOAD = 0 to 800mA
VEN = 5V, VIN = 5V
VMODE/SYNC(H)
IMODE/SYNC
Enable Threshold High
Input Low Current
Min Typ Max Units
2.7 5.5 V
1.8 V
250 mV
1.5 V
-3.0 3.0 %
0.9 VIN
0.891 0.9 0.909
V
V
1.0 µA
1.0 µA
0.2 µA
1.2 A
400 mΩ
300 mΩ
0.5 %
0.2 %/V
1.6 2.0 2.4 MHz
140 °C
15 °C
1.4
-1.0
VIN ×
0.7
-1.0
0.6
1.0
VIN ×
0.4
1.0
V
V
µA
V
V
µA
1. The AAT2503 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.
2503.2007.04.1.1
5
5 Page 
AAT2503
Adjustable 3-Channel Regulator
Typical Characteristics—LDO Regulator
Line Transient
(VOUT = 1.8V; IOUT = 100mA; VIN = 3.6V to 4.2V)
5.0
4.5
4.0
VIN
3.5
3.0
2.5
2.0
1.5
1.0
0.5 VOUT
0.0
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
Line Transient
(VOUT = 1.8V; IOUT = 150mA; VIN = 3.6V to 4.2V)
5.0
4.5 VIN
4.0
3.5
3.0
2.5
2.0
1.5
1.0 VOUT
0.5
0.0
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
Time (100µs/div)
Time (100µs/div)
Line Regulation
(VOUT = 1.2V)
2.0
1.5
1.0 1mA 10mA
0.5
0.0
-0.5
50mA
150mA
-1.0 100mA
-1.5
-2.0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
0
Load Regulation
(VOUT = 1.2V)
VIN = 2.7V
VIN = 3.6V
VIN = 5.5V VIN = 4.2V
1 10 100
Output Current (mA)
1000
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
0
Load Regulation
(VOUT = 2.8V)
VIN = 3.3V
VIN = 3.6V
VIN = 5.5V VIN = 4.2V
1 10 100
Output Current (mA)
1000
2503.2007.04.1.1
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet AAT2503.PDF ] | |
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