Datasheet

MAX8903A–E/G/H/J/N/Y
2A 1-Cell Li+ DC-DC Chargers
for USB and Adapter Power
3
Maxim Integrated
PARAMETER CONDITIONS MIN TYP MAX UNITS
No valid USB input 1 ms
DC Soft-Start Time
Valid USB input before soft-start 20 µs
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 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
MAX8903A/B/E/G/Y 3.0
Minimum SYS Regulation Voltage
(V
SYSMIN
)
I
SYS
= 1A,
V
BAT
< V
SYSMIN MAX8903C/D/H/J/N 3.4
V
MAX8903A/C/D/H/N/Y 4.3 4.4 4.5
MAX8903B/E/G 4.265 4.325 4.395Regulation Voltage I
SYS
= 0A
MAX8903J 4.4 4.5 4.55
V
MAX8903A/C/D/H 40
Load Regulation I
SYS
= 0 to 2A
MAX8903B/E/G/J/N/Y 25
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
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)