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PDF AAT2552 Data sheet ( Hoja de datos )
| Número de pieza | AAT2552 | |
| Descripción | Total Power Solution | |
| Fabricantes | AAT | |
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AAT2552
Total Power Solution for Portable Applications
General Description
Features
SystemPower™
The AAT2552 is a fully integrated 500mA battery
charger, a 300mA step-down converter, and a
300mA low dropout (LDO) linear regulator. The
input voltage range is 4V to 6.5V for the battery
charger and 2.7V to 5.5V for the step-down con-
verter and linear regulator, making it ideal for appli-
cations operating with single-cell lithium-ion/poly-
mer batteries.
The battery charger is a complete constant cur-
rent/constant voltage linear charger. It offers an
integrated pass device, reverse blocking protec-
tion, high accuracy current and voltage regulation,
charge status, and charge termination. The charg-
ing current is programmable via external resistor
from 30mA to 500mA. In addition to these stan-
dard features, the device offers over-voltage, cur-
rent limit, and thermal protection.
The step-down converter is a highly integrated
converter operating at a 1.5MHz switching fre-
quency, minimizing the size of external compo-
nents while keeping switching losses low. The out-
put voltage ranges from 0.6V to the input voltage.
The AAT2552 linear regulator is designed for high
speed turn-on and turn-off performance, fast tran-
sient response, and good power supply ripple
rejection. Delivering up to 300mA of load current,
it includes short-circuit protection and thermal
shutdown.
The AAT2552 is available in a Pb-free, thermally-
enhanced TDFN34-16 package and is rated over
the -40°C to +85°C temperature range.
Typical Application
• Battery Charger:
— Input Voltage Range: 4V to 6.5V
— Programmable Charging Current up to
500mA
— Highly Integrated Battery Charger
• Charging Device
• Reverse Blocking Diode
• Current Sensing
• Step-Down Converter:
— Input Voltage Range: 2.7V to 5.5V
— Output Voltage Range: 0.6V to VIN
— 300mA Output Current
— Up to 96% Efficiency
— 45µA Quiescent Current
— 1.5MHz Switching Frequency
— 120µs Start-Up Time
• Linear Regulator:
— 300mA Output Current
— Low Dropout: 400mV at 300mA
— Fast Line and Load Transient Response
— High Accuracy: ±1.5%
— 85µA Quiescent Current
• Short-Circuit, Over-Temperature, and Current
Limit Protection
• TDFN34-16 Package
• -40°C to +85°C Temperature Range
Applications
• Bluetooth® Headsets
• Cellular Phones
• GPS
• Handheld Instruments
• MP3 and Portable Music Players
• PDAs and Handheld Computers
• Portable Media Players
Adapter/USB Input
Enable
VOUTB
COUTB
4.7μF
RFBB1
RFBB2
VOUTA
COUTA
ADP
INB
STAT
ENB
EN_BAT
INA
L1 ENA
LX AAT2552
RFBA1
RFBA2
FBB
OUTA
FBA
GND
MODE
BAT
ISET
COUT
R SET
BATT+
BATT-
Battery
Pack
2552.2007.04.1.0
1
1 page  
AAT2552
Total Power Solution for Portable Applications
Electrical Characteristics1
VINA = VOUT(NOM) + 1V. IOUT = 1mA, COUT = 2.2µF, TA = -40°C to +85°C, unless otherwise noted. Typical val-
ues are TA = 25°C.
Symbol Description
Conditions
Linear Regulator
VOUT
Output Voltage Tolerance
VOUT
VFB
Output Voltage Range
Feedback Voltage Accuracy
IOUTA = 1mA
to 300mA
TA = 25°C
TA = -40°C to +85°C
VIN Input Voltage
VDO
ΔVOUT/
VOUT*ΔVIN
IOUT
ISC
IQ
ISHDN
Dropout Voltage3
Line Regulation
Output Current
Short-Circuit Current
Quiescent Current
Shutdown Current
PSRR
Power Supply Rejection
Ratio
TSD
THYS
Over-Temperature
Shutdown Threshold
Over-Temperature
Shutdown Hysteresis
IOUTA = 300mA; VOUT = 3.3V
VINA = VOUTA + 1 to 5.0V
VOUTA > 2.0V
VOUTA < 0.4V
VINA = 5V; VENA = VIN
VINA = 5V; VENA = 0V
1kHz
IOUTA =10mA
10kHz
1MHz
eN
TC
VEN(L)
VEN(H)
IEN
Output Noise
Output Voltage
Temperature Coefficient
Enable Threshold Low
Enable Threshold High
Enable Input Current
eNBW = 100Hz to 100kHz
VINA = VENA = 5.5V
Min Typ Max Units
-1.5
-2.5
1.2
1.22
VOUT +
VDO2
1.24
400
1.5
2.5
3.3
1.26
5.5
650
0.09
300
400
85 150
1.0
70
50
30
140
%
V
V
V
mV
%/V
mA
mA
µA
µA
dB
°C
15 °C
95
µVRMS/
√Hz
8 ppm/°C
0.6 V
1.4 V
1.0 µA
1. The AAT2552 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.
2. VDO is defined as VIN - VOUT when VOUT is 98% of nominal.
3. For VOUT <2.3V, VDO = 2.5V - VOUT.
2552.2007.04.1.0
5
5 Page 
AAT2552
Total Power Solution for Portable Applications
Typical Characteristics–Step-Down Converter
Line Regulation
(VOUT = 1.8V)
0.2
0.1 IOUT = 10mA
0
IOUT = 50mA
-0.1
-0.2
-0.3
IOUT = 150mA
-0.4
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
Soft Start
(VIN = 3.6V; VOUT = 1.8V; IOUT = 150mA)
4
VEN
3
2 VOUT
1
0
IL 0.3
0.2
0.1
0.0
Time (100µs/div)
Output Voltage Accuracy vs. Temperature
(VIN = 3.6V; VO = 1.8V; IOUT = 150mA)
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-40 -15 10 35 60 85
Temperature (°C)
No Load Quiescent Current vs. Input Voltage
70
60 85°C
25°C
50
40
-40°C
30
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
N-Channel RDS(ON) vs. Input Voltage
1000
900
85°C
800
700
600
500
400 25°C
300
2.5 3 3.5
100°C
120°C
4 4.5
VIN (V)
5
5.5
6
P-Channel RDS(ON) vs. Input Voltage
600
500 85°C 100°C 120°C
400
300
200 25°C
100
2.5 3 3.5 4 4.5 5 5.5 6
VIN (V)
2552.2007.04.1.0
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AAT2552.PDF ] | |
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