AAT2557
500mA Battery Charger and 300mA
LDO Regulator for Portable Systems
1
Electrical Characteristics
VADP = 5V; TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol
Description
Conditions
Min Typ Max Units
Battery Charger
Operation
VADP
Adapter Voltage Range
Under-Voltage Lockout (UVLO)
UVLO Hysteresis
Operating Current
Shutdown Current
4.0
3
6.5
4
V
V
mV
mA
µA
µA
Rising Edge
VUVLO
150
0.5
0.3
0.4
IOP
Charge Current = 200mA
VBAT = 4.25V, EN_BAT = GND
1
1
2
ISHUTDOWN
ILEAKAGE
Voltage Regulation
Reverse Leakage Current from BAT Pin VBAT = 4V, ADP Pin Open
VBAT EOC
ΔVCH/VCH
VMIN
End of Charge Accuracy
4.158 4.20 4.242
0.5
V
ꢀ
V
_
Output Charge Voltage Tolerance
Preconditioning Voltage Threshold
Battery Recharge Voltage Threshold
2.85
3.0
3.15
VRCH
Measured from VBAT EOC
-0.1
V
_
Current Regulation
ICH
ΔICH/ICH
VSET
Charge Current Programmable Range
Charge Current Regulation Tolerance
ISET Pin Voltage
15
500
mA
ꢀ
V
10
2
KI_A
Current Set Factor: ICH/ISET
800
Charging Devices
RDS(ON)
Charging Transistor On Resistance
VADP = 5.5V
0.9
1.1
Ω
Logic Control/Protection
VEN(H)
VEN(L)
VSTAT
ISTAT
VOVP
Enable Threshold High
Enable Threshold Low
Output Low Voltage
STAT Pin Current Sink Capability
Over-Voltage Protection Threshold
Pre-Charge Current
1.6
V
V
V
mA
V
ꢀ
ꢀ
0.4
0.4
8
STAT Pin Sinks 4mA
ICH = 100mA
4.4
10
10
ITK/ICHG
TERM/ICHG
I
Charge Termination Threshold Current
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
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
