Manual

MAX1508
Li+ Linear Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK in 3mm x 3mm TDFN
_______________________________________________________________________________________ 3
Note 1: Limits are 100% production tested at T
A
= +25°C. Limits over operating temperature range are guaranteed through correla-
tion using statistical quality control (SQC) methods.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 5V, V
BATT
= 4.0V, ACOK = EN = CHG = unconnected, R
ISET
= 2.8kΩ to GND, C
VL
= 0.47µF, BATT bypassed to GND with
1µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
BATT Removal Detection-Threshold Hysteresis 200 mV
Minimum BATT Bypass Capacitance 1 µF/A
Fast-Charge Current-Loop System Accuracy V
BATT
= 3.5V 478 520 562 mA
Precharge Current System Accuracy
Percentage of the fast-charge current,
V
BATT
= 2.2V
51015%
Die-Temperature-Regulation Set Point 100 °C
V
BATT
Precharge Threshold Voltage V
BATT
rising 2.3 2.5 2.7 V
Current-Sense Amplifier Gain, I
SET
to I
BATT
in
Fast-Charge Mode
I
BATT
= 500mA, V
ISET
= 1.4V 0.880 0.958 1.035 mA/A
Regulator Dropout Voltage (V
IN
- V
BATT
)V
BATT
= 4.1V, I
BATT
= 425mA 130 200 mV
EN Logic Input Low Voltage 4.25V < V
IN
< 6.5V 0.52 V
EN Logic Input High Voltage 4.25V < V
IN
< 6.5V 1.3 V
EN Internal Pulldown Resistor 100 200 400 kΩ
CHG Output Low Current V
CHG
= 1V 5 12 20 mA
T
A
= +25°C1
CHG Output High Leakage Current V
CHG
= 13V
T
A
= +85°C 0.002
µA
ACOK Output Low Voltage I
ACOK
= 0.5mA 0.4 V
T
A
= +25°C1
ACOK Output High Leakage Current V
ACOK
= 5.5V
T
A
= +85°C 0.002
µA
Full-Battery Detection Current Threshold
(as a Percentage of the Fast-Charge Current)
I
BATT
falling 5 10 15 %