Rainbow Electronics MAX1508 - Manual (Page 3)

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 = 2.8k Ω 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
5 10 15 %
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 k Ω
CHG Output Low Current V CHG = 1V 5 12 20 mA
T A = +25°C 1
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°C 1
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 %