Rainbow Electronics MAX8903A - Manual (Page 4)

MAX8903A
2A 1-Cell Li+ DC-DC Charger for USB*
and Adapter Power
4 _______________________________________________________________________________________
PARAMETER CONDITIONS MIN TYP MAX UNITS
R ISET = 600 Ω 1800 2000 2200
R ISET = 1.2k Ω 900 1000 1100 Fast-Charge Current
R ISET = 2.4k Ω 450 500 550
mA
DONE Threshold Percentage of fast-charge, I BAT decreasing 10 %
R ISET Resistor Range 0.6 2.4 k Ω
ISET Output Voltage 1.5 V
ISET Current Monitor Gain 1.25 mA/A
No DC or USB input 0.05 4
BAT Leakage Current
With valid input power, V CEN = 5V 1 6
µA
Charger Soft-Start Time 1.0 ms
Charger Thermal Limit
Temperature
100 °C
Charger Thermal Limit Gain Charge current = 0 at + 120°C 5 %/°C
CHARGER TIMER
Prequalification Time C CT = 0.15µF 33 min
Fast-Charge Time C CT = 0.15µF 660 min
Timer Accuracy -15 +15 %
Timer Extend Current Threshold
Percentage of fast-charge current below which the timer
clock operates at half-speed
40 50 60 %
Timer Suspend Current Threshold
Percentage of fast-charge current below which timer
clock pauses
16 20 24 %
Charge Done Delay Time
From done threshold detection until charger turns off and
CHG goes high
15 s
THERMISTOR MONITOR
THM Threshold, Hot When charging is suspended, 1% hysteresis
0.27 x
V VL
0.28 x
V VL
0.29 x
V VL
V
THM Threshold, Cold When charging is suspended, 1% hysteresis
0.73 x
V VL
0.74 x
V VL
0.75 x
V VL
V
THM Threshold, Disabled THM function is disabled below this voltage
0.0254
x V VL
0.03 x
V VL
0.036 x
V VL
V
THM = GND or VL; T A = +25°C -0.1 +0.001 +0.2
THM Input Leakage
THM = GND or VL; T A = +85°C 0.01
µA
THERMAL SHUTDOWN, VL, AND LOGIC I/O: CHG, FLT, DOK, UOK, DCM, CEN, USUS, IUSB
High level 1.3
Low level 0.4
V Logic-Input Thresholds
(DCM, CEN, USUS, IUSB)
Hysteresis 50 mV
T A = +25°C 0.001 1 Logic-Input Leakage Current
(DCM, CEN, USUS, IUSB)
V INPUT = 0 to 5.5V
T A = +85°C 0.01
µA
ELECTRICAL CHARACTERISTICS (continued)
(V DC = V USB = 5V, V BAT = 4V, circuit of Figure 2, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)
(Note 1)