MAX8903A
2A 1-Cell Li+ DC-DC Charger for USB*
and Adapter Power
_______________________________________________________________________________________ 3
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 8V
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 2USB 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)
(7 Seiten)
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