AAT2556
Battery Charger and Step-Down
Converter for Portable Applications
Electrical Characteristics1
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
4.0
3
6.5
4
V
Under-Voltage Lockout (UVLO)
UVLO Hysteresis
Rising Edge
V
VUVLO
150
0.5
0.3
0.4
mV
mA
µA
µA
IOP
Operating Current
Charge Current = 200mA
VBAT = 4.25V, EN = GND
1
1
2
ISHUTDOWN
ILEAKAGE
Voltage Regulation
Shutdown Current
Reverse Leakage Current from BAT Pin VBAT = 4V, ADP Pin Open
VBAT EOC
End of Charge Accuracy
4.158 4.20 4.242
0.5
V
%
V
_
ΔVCH/VCH
VMIN
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
15
500
mA
%
Charge Current Regulation Tolerance
ISET Pin Voltage
10
2
V
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)
Input High Threshold
1.6
V
V
Input Low Threshold
0.4
0.4
8
VSTAT
Output Low Voltage
STAT Pin Sinks 4mA
ICH = 100mA
V
ISTAT
STAT Pin Current Sink Capability
Over-Voltage Protection Threshold
Pre-Charge Current
mA
V
VOVP
4.4
10
10
ITK/ICHG
TERM/ICHG
%
%
I
Charge Termination Threshold Current
1. The AAT2556 output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -25°C to +85°C
temperature range is guaranteed by design.
2556.2006.09.1.2
5
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
