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PDF AAT2557 Data sheet ( Hoja de datos )
| Número de pieza | AAT2557 | |
| Descripción | 500mA Battery Charger and 300mA LDO Regulator | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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General Description
The AAT2557 is a fully integrated 500mA battery
charger 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 linear
regulator, making it ideal for applications operating
with single-cell lithium-ion/polymer batteries.
The battery charger is a complete constant cur-
www.DataSheet4U.croemnt/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 15mA to 500mA. In addition to these stan-
dard features, the device offers over-voltage, cur-
rent limit, and thermal protection.
The linear regulator is designed for fast transient
response and good power supply ripple rejection.
Capable of up to 300mA load current, it includes
short-circuit protection and thermal shutdown.
The AAT2557 is available in a Pb-free, thermally-
enhanced TSOPJW-14 package and is rated over
the -40°C to +85°C temperature range.
AAT2557
500mA Battery Charger and 300mA
LDO Regulator for Portable Systems
Features
SystemPower™
• Battery Charger:
— Input Voltage Range: 4V to 6.5V
— Programmable Charging Current up to
500mA
— Highly Integrated Battery Charger
• Charging Device
• Reverse Blocking Diode
• Linear Regulator:
— 300mA Output Current
— Low Dropout: 400mV at 300mA
— Fast Line and Load Transient Response
— High Accuracy: ±1.5%
— 70µA Quiescent Current
• Short-Circuit, Over-Temperature, and Current
Limit Protection
• TSOPJW-14 Package
• -40°C to +85°C Temperature Range
Applications
• Bluetooth® Headsets
• Cellular and DECT Phones
• Handheld Instruments
• MP3 and Portable Music Players
• PDAs and Handheld Computers
• Portable Media Players
Typical Application
Adapter/USB Input
Charger Enable
LDO Enable
VOUTLDO
C OUTLDO
ADP
INLDO
STAT
EN_BAT
AAT2557
ENLDO
BAT
OUTLDO
C BYP
BYP
GND
ISET
C INLDO
CBAT
RSET
BATT+
BATT-
Battery
Pack
2557.2007.06.1.0
1
1 page  
AAT2557
500mA Battery Charger and 300mA
LDO Regulator for Portable Systems
Electrical Characteristics1
VADP = 5V; TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol Description
Conditions
Battery Charger
Operation
VADP
Adapter Voltage Range
VUVLO
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IOP
Under-Voltage Lockout (UVLO)
UVLO Hysteresis
Operating Current
ISHUTDOWN Shutdown Current
ILEAKAGE
Reverse Leakage Current from BAT Pin
Voltage Regulation
Rising Edge
Charge Current = 200mA
VBAT = 4.25V, EN_BAT = GND
VBAT = 4V, ADP Pin Open
VBAT_EOC End of Charge Accuracy
ΔVCH/VCH Output Charge Voltage Tolerance
VMIN
Preconditioning Voltage Threshold
VRCH
Battery Recharge Voltage Threshold
Current Regulation
Measured from VBAT_EOC
ICH Charge Current Programmable Range
ΔICH/ICH Charge Current Regulation Tolerance
VSET
ISET Pin Voltage
KI_A Current Set Factor: ICH/ISET
Charging Devices
RDS(ON)
Charging Transistor On Resistance
Logic Control/Protection
VADP = 5.5V
VEN(H)
VEN(L)
VSTAT
ISTAT
VOVP
ITK/ICHG
ITERM/ICHG
Enable Threshold High
Enable Threshold Low
Output Low Voltage
STAT Pin Current Sink Capability
Over-Voltage Protection Threshold
Pre-Charge Current
Charge Termination Threshold Current
STAT Pin Sinks 4mA
ICH = 100mA
Min
4.0
3
4.158
2.85
15
1.6
Typ
150
0.5
0.3
0.4
4.20
0.5
3.0
-0.1
10
2
800
0.9
4.4
10
10
Max Units
6.5 V
4V
mV
1 mA
1 µA
2 µA
4.242
3.15
V
%
V
V
500 mA
%
V
1.1 Ω
V
0.4 V
0.4 V
8 mA
V
%
%
1. The AAT2557 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.
2557.2007.06.1.0
5
5 Page 
AAT2557
500mA Battery Charger and 300mA
LDO Regulator for Portable Systems
Typical Characteristics – LDO Regulator
VEN(L) and VEN(H) vs. VIN
1.250
1.225
1.200
1.175
1.150
VEN(H)
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1.125
1.100
1.075
VEN(L)
1.050
2.5
3.0
3.5 4.0
4.5 5.0
5.5
Input Voltage (V)
2557.2007.06.1.0
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet AAT2557.PDF ] | |
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