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PDF AAT2782 Data sheet ( Hoja de datos )
| Número de pieza | AAT2782 | |
| Descripción | Triple Output PMIC | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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PRODUCT DATASHEET
AAT2782
SystemPowerTM
Triple Output PMIC: Dual Buck with Low-VIN LDO
General Description
Features
The AAT2782 provides three independently regulated
DC outputs: two step-down (Buck) regulators and a
single low input voltage, low drop-out (LDO) regulator.
The input voltage range for the step-down regulators is
2.7V to 5.5V, while the LDO regulator allows inputs from
1.5V to 5.5V. The low input voltage LDO regulator allows
high efficiency, step-down, low noise outputs. In addi-
tion, the LDO input may be connected to step-down
outputs 1 or 2.
The Channel 1 and 2 step-down regulators can deliver up
to 1200mA and 600mA output current, respectively.
Step-down output voltages are set with external resis-
tors. Switching frequency is set at 1.3MHz to ensure
small external filtering components. Current mode con-
trol assures fast transient response and stable operation
across the operating range. The Channel 3 LDO regulator
can deliver up to 400mA with -80dB power supply rejec-
tion ratio (PSRR) and 65µVRMS output noise with an
optional bypass capacitor. The LDO output voltage is fac-
tory set with a default voltage of 1.20V. Independent
enable and input pins are provided. The device consumes
low quiescent current and provides high efficiency across
the load range for maximum life in battery systems.
The AAT2782 is available in the Pb-free, 16-pin TDFN34
package and is rated over the -40°C to 85°C operating
temperature range.
• VIN Range Step-Down (Buck): 2.7V to 5.5V
• VIN Range Low Drop-Out (LDO): 1.5V to 5.5V
• Output Voltage Range: 0.6V to VIN
• Step-Down Output Current:
▪ Channel 1: 1200mA
▪ Channel 2: 600mA
• LDO Output Current:
▪ Channel 3: 400mA
• High Efficiency with Low RDS(ON) Switches
▪ Step-Down up to 97%
▪ LDO Regulator up to 80%
• Total Quiescient Current 170µA
• Shutdown Current: 1µA
• Step-Down Converters
▪ 1.3MHz Switching Frequency
▪ Current Mode Control
▪ Cycle-by-Cycle Current Limit
▪ High Efficiency Light-Load Mode Operation
• LDO Converter
▪ Ultra Low Noise with Bypass Capacitor
▪ Over-Current Protection
• 200µs Internal Soft Start
• Over-Temperature Protection
• TDFN34-16 Low Profile Package
• -40°C to 85°C Temperature Range
Applications
Typical Application
• Cellular and SmartPhones
• Microprocessor / DSP Core / IO Power
• PDAs and Handheld Computers
• Portable Media Players
• Wireless Data Systems
VIN
2.7V –5.5V
C1
10µF
AAT2782
C4
0.1µF
VP1
EN1
VIN
AGND
LX1
FB1
GND1
VP2 LX2
EN2
FB2
VIN = VOUT2
C3
2.2µF
GND2
GND2
VIN3
EN3
OUT3
BYP
AGND
EP
L1
1.5µH
VOUT1
1.2V, 1.2A
L2
2.2µH
R5
59.0k
R4
59.0k
C8
10µF
VOUT2
1.7V, 0.6A
R3
107k
R2
59.0k
VOUT3
1.2V, 400mA
C5
4.7µF
C7
0.01µF
C2
10µF
2782.2008.05.1.0
www.analogictech.com
1
1 page  
SystemPowerTM
PRODUCT DATASHEET
AAT2782
Triple Output PMIC: Dual Buck with Low-VIN LDO
Electrical Characteristics1
VP1 = VP2 = VIN = VIN3 = 3.3V; VIN3 = 1.8V, TA = -40°C to 85°C, unless noted otherwise. Typical values are at TA = 25°C.
Symbol Description
Conditions
Channel 2: 600mA Step-down (Buck) Converter
VP2 Input Voltage
VOUT2
Output Voltage Range
VOUT2(TOL) Output Voltage Tolerance
IOUT2= 0 to 600mA; VP1 = 2.7 to 5.5V
VFB2 Feedback Pin Voltage
ΔVLOADREG2 Load Regulation
IOUT2 = 0 to 600mA
ΔVLINEREG2 Line Regulation
VP2 = 2.7 to 5.5V
IQ2 Quiescent Current
No Load; EN2 = VIN; EN1 = EN3 = GND
ILIM2
P-Channel Current Limit
RDS(ON)H2 High Side Switch On-Resistance
RDS(ON)L2 Low Side Switch On-Resistance
FOSC2
Oscillator Frequency
TS2 Start-Up Time
From Enable to Output Regulation
Channel 3: 400mA Low Dropout (LDO) Converter
VIN3
VDO3
VOUT3
IOUT3
ISC
IQ
TS
PSRR
eN
Input Voltage
Dropout Voltage
LDO Output Voltage Tolerance
Max Output Current
Short-Circuit Current
Quiescent Current
Start-Up Time
Power Supply Rejection Ratio
Output Noise
IOUT3 = 150mA; VOUT3 > 1.20V
IOUT3 = 400mA; VOUT3 > 1.20V
VIN3 = VOUT3 + VDO3 to 5.5V; IOUT3 = 0mA to 400mA
VOUT3 = 1.2V
VOUT3 < 0.4V
No Load; EN1 = EN2 = GND; EN3 = VIN
From Enable to Output Regulation
10Hz, IOUT3 = 10mA
3kHz, IOUT3 = 10mA
30kHz, IOUT3 = 10mA
300kHz, IOUT3 = 10mA
BW = 100Hz to 300kHz, CBYP = 10nF, IOUT3 = 10mA
Min Typ Max
2.7 5.5
0.6
-3.0
VP2
3.0
0.591 0.6 0.609
0.5
0.3
75
1.7
250
190
1.3
200
1.7
1.164
400
140
300
1.200
1.1
85
200
85
80
60
55
65
VIN
1.236
Units
V
V
%
V
%
%
µA
A
mΩ
mΩ
MHz
µs
V
mV
V
mA
A
µA
µs
dB
dB
dB
dB
µVRMS
1. The AAT2782 is guaranteed to meet performance specifications over the –40°C to +85°C operating temperature range and is assured by design, characterization and correla-
tion with statistical process controls.
2782.2008.05.1.0
www.analogictech.com
5
5 Page 
SystemPowerTM
PRODUCT DATASHEET
AAT2782
Triple Output PMIC: Dual Buck with Low-VIN LDO
Typical Characteristics—LDO
LDO Line Regulation
(VIN3 = VOUT2 = 1.7V; VOUT3 = 1.2V; Vary VIN)
0.5
0.4
0.3
0.2
0.1
0.0
-0.1
-0.2
-0.3
-0.4
-0.5
2.5
IOUT = 0.1mA to 400mA
3.0 3.5 4.0 4.5 5.0
Input Voltage (V)
5.5
LDO VIH and VIL vs. Input Voltage
(VEN1 = 0V; VEN2 = VEN3 = VIN)
1.0
0.9 VIH
0.8 VIL
0.7
0.6
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
LDO Dropout Characteristics
(VIN = 3.3V; Vary VIN3 from 3.3V to 1V; VOUT3 = 1.2V;
IOUT3 = 0.1mA to 400mA; -40°C)
1.210
1.205
1.200
1.195
1.190
1.185
IOUT3 = 1mA
IOUT3 = 10mA
IOUT3 = 50mA
IOUT3 = 100mA
IOUT3 = 150mA
IOUT3 = 300mA
IOUT3 = 400mA
1.180
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4
Input Voltage (V)
LDO Dropout Characteristics
(VIN = 3.3V; VIN3 = 3.3V to 1V; VOUT3 = 1.2V;
IOUT3 = 0.1mA to 400mA; 85°C)
1.210
1.205
1.200
1.195
1.190
1.185
1.180
IOUT3 = 0.1mA
IOUT3 = 10mA
IOUT3 = 50mA
IOUT3 = 100mA
IOUT3 = 150mA
IOUT3 = 300mA
IOUT3 = 400mA
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4
Input Voltage (V)
LDO Dropout Characteristics
(VIN = 3.3V; VIN3 = 3.3V to 1V; VOUT3 = 1.2V;
IOUT3 = 0.1mA to 400mA; 25°C)
1.210
1.205
1.200
1.195
1.190
1.185
IOUT3 = 0.1mA
IOUT3 = 10mA
IOUT3 = 50mA
IOUT3 = 100mA
IOUT3 = 150mA
IOUT3 = 300mA
IOUT3 = 400mA
1.180
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4
Input Voltage (V)
LDO Load Transient Response
(200mA to 400A; VIN = 3.3V; VIN3 = VOUT2 = 1.7V)
1.25
1.20
1.15
200mA
400mA
0.6
0.4
0.2
0.0
Time (50µs/div)
2782.2008.05.1.0
www.analogictech.com
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| PDF Descargar | [ Datasheet AAT2782.PDF ] | |
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