Rainbow Electronics MAX8903A - Manual (Page 3)

MAX8903A
2A 1-Cell Li+ DC-DC Charger for USB*
and Adapter Power
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PARAMETER CONDITIONS MIN TYP MAX UNITS
DC Output Current
500mA USB Mode
(Note 3)
V DCM = 0V, V IUSB = 5V 450 475 500 mA
DC Output Current
100mA USB Mode
(Note 2)
V DCM = 0V, V IUSB = 0V 90 95 100 mA
SYS to DC Reverse Current
Blocking
V SYS = 5.5V, V DC = 0V 0.01 µA
USB INPUT
USB Operating Range 4.1 6.3 V
USB Standoff Voltage 8 V
USB Undervoltage Threshold When V UOK goes low, V USB rising, 500mV hysteresis 3.95 4.0 4.05 V
USB Overvoltage Threshold When V UOK goes high, V USB rising, 500mV hysteresis 6.8 6.9 7.0 V
V IUSB = 0V (100mA setting) 90 95 100
USB Current Limit
V IUSB = 5V (500mA setting) 450 475 500
mA
I SYS = I BAT = 0mA, V CEN = 0V 1.3 3
I SYS = I BAT = 0mA, V CEN = 5V 0.8 2 USB Supply Current
V USUS = 5V (USB suspend mode) 0.115 0.25
mA
Minimum USB to BAT Headroom 0 15 30 mV
USB to SYS Dropout Resistance 0.2 0.35 Ω
V USB rising 1 ms
USB Soft-Start Time
V DC falling below DC UVLO to initiate USB soft-start 20 µs
SYS OUTPUT
Minimum SYS Regulation Voltage I SYS = 1A, V BAT < V SYS_MIN 3.0 V
Regulation Voltage I SYS = 0A 4.3 4.4 4.5 V
Load Regulation I SYS = 0 to 2A 40 mV/A
CS to SYS Resistance V DC = 6V, V DCM = 5V, V SYS = 4V, I CS = 1A 0.07 Ω
SYS to CS Leakage V SYS = 5.5V, V DC = V CS = 0V 0.01 µA
BAT to SYS Resistance V DC = V USB = 0V, V BAT = 4.2V, I SYS = 1A 0.05 0.1 Ω
BAT to SYS Reverse Regulation
Voltage
V USB = 5V, V DC = 0V, V IUSB = 0V, I SYS = 200mA 50 75 100 mV
SYS Undervoltage Threshold SYS falling, 200mV hysteresis (Note 4) 1.8 1.9 2.0 V
BATTERY CHARGER
T A = +25°C 4.179 4.2 4.221
BAT Regulation Voltage I BAT = 0mA
T A = -40°C to +85°C 4.158 4.2 4.242
V
Charger Restart Threshold Change in V BAT from DONE to fast-charge -150 -100 -60 mV
BAT Prequal Threshold V
BAT
rising, 180mV hysteresis 2.9 3 3.1 V
Prequal Charge Current Percentage of fast-charge current set at ISET 10 %
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)