Battery Charger and Step-Down
Converter for Portable Applications
Electrical Characteristics
1
V
ADP
= 5V; T
A
= -40°C to +85°C, unless otherwise noted. Typical values are T
A
= 25°C.
Symbol
Description
Conditions
Min
Typ
Max
Units
AAT2556
Battery Charger
Operation
V
ADP
Adapter Voltage Range
Under-Voltage Lockout (UVLO)
V
UVLO
UVLO Hysteresis
I
OP
Operating Current
I
SHUTDOWN
Shutdown Current
I
LEAKAGE
Reverse Leakage Current from BAT Pin
Voltage Regulation
V
BAT_EOC
End of Charge Accuracy
ΔV
CH
/V
CH
Output Charge Voltage Tolerance
V
MIN
Preconditioning Voltage Threshold
V
RCH
Battery Recharge Voltage Threshold
Current Regulation
I
CH
Charge Current Programmable Range
ΔI
CH
/I
CH
Charge Current Regulation Tolerance
V
SET
ISET Pin Voltage
K
I_A
Current Set Factor: I
CH
/I
SET
Charging Devices
R
DS(ON)
Charging Transistor On Resistance
Logic Control/Protection
V
EN(H)
Input High Threshold
V
EN(L)
Input Low Threshold
V
STAT
Output Low Voltage
I
STAT
STAT Pin Current Sink Capability
V
OVP
Over-Voltage Protection Threshold
I
TK
/I
CHG
Pre-Charge Current
I
TERM
/I
CHG
Charge Termination Threshold Current
Rising Edge
Charge Current = 200mA
V
BAT
= 4.25V, EN = GND
V
BAT
= 4V, ADP Pin Open
4.0
3
150
0.5
0.3
0.4
4.158
2.85
4.20
0.5
3.0
-0.1
6.5
4
1
1
2
4.242
3.15
V
V
mV
mA
µA
µA
V
%
V
V
mA
%
V
Measured from V
BAT_EOC
15
500
10
2
800
V
ADP
= 5.5V
1.6
STAT Pin Sinks 4mA
0.9
1.1
Ω
V
V
V
mA
V
%
%
0.4
0.4
8
4.4
10
10
I
CH
= 100mA
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.
2556.2006.05.1.0
5
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
