Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature Range ............................-40°C to +150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(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)
PARAMETER
DC INPUT
DC Operating Range
DC Undervoltage Threshold
DC Overvoltage Threshold
When V
DOK
goes low, V
DC
rising, 500mV typical hysteresis
No valid USB input
Valid USB input
4.15
3.9
4.0
16.5
4.0
4.3
17
2.3
15
1
1
0.10
0.15
0.15
Assumes a 40mΩ inductor resistance (R
L
)
When SYS regulation and charging stops, V
DC
falling,
200mV hysteresis
0
0.31
15
100
V
DC
= 8V, V
BAT
= 4V
V
DC
= 5V, V
BAT
= 3V
V
DC
= 9V, V
BAT
= 4V
V
DC
= 9V, V
BAT
= 3V
0.5
R
IDC
= 3kΩ
V
DC
= 6V, V
SYS
= 4V
R
IDC
= 6kΩ
R
IDC
= 12kΩ
1900
950
450
2000
1000
500
70
4
3
1
1
2
2100
1050
550
mA
A
30
2
2
0.25
Ω
Ω
Ω
mV
ns
ns
mA
16
4.1
4.4
17.5
4
V
V
V
CONDITIONS
MIN
TYP
MAX
UNITS
When V
DOK
goes high, V
DC
rising, 500mV typical
hysteresis
Charger enabled, no switching, V
SYS
= 5V
Charger enabled, f = 3MHz, V
DC
= 5V
DC Supply Current
Charger enabled, V
CEN
= 0V, 100mA USB mode (Note 2)
Charger enabled, V
CEN
= 5V, 100mA USB mode (Note 2)
V
DCM
= 0V, V
USUS
= 5V
DC High-Side Resistance
DC Low-Side Resistance
DC-to-BAT Dropout Resistance
DC-to-BAT Dropout Voltage
Minimum Off Time (t
OFFMIN
)
Minimum On Time (t
ONMIN
)
MAX8903A/B/C/D/E/H/J/Y
Switching Frequency (f
SW
)
MAX8903G
DC Step-Down Output Current-
Limit Step Range
DC Step-Down Output Current
Limit (I
SDLIM
)
2
MHz
Maxim Integrated
MAX8903A–E/G/H/J/N/Y
2A 1-Cell Li+ DC-DC Chargers
for USB and Adapter Power
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)
PARAMETER
DC Soft-Start Time
DC Output Current
500mA USB Mode (Note 3)
DC Output Current
100mA USB Mode (Note 2)
SYS to DC Reverse Current
Blocking
USB INPUT
USB Operating Range
USB Standoff Voltage
USB Undervoltage Threshold
USB Overvoltage Threshold
USB Current Limit
When V
UOK
goes low, V
USB
rising, 500mV hysteresis
When V
UOK
goes high, V
USB
rising, 500mV hysteresis
V
IUSB
= 0V (100mA setting)
V
IUSB
= 5V (500mA setting)
I
SYS
= I
BAT
= 0mA, V
CEN
= 0V
USB Supply Current
Minimum USB to BAT Headroom
USB to SYS Dropout Resistance
USB Soft-Start Time
SYS OUTPUT
Minimum SYS Regulation Voltage
(V
SYSMIN
)
Regulation Voltage
I
SYS
= 1A,
V
BAT
< V
SYSMIN
I
SYS
= 0A
MAX8903A/B/E/G/Y
MAX8903C/D/H/J/N
MAX8903A/C/D/H/N/Y
MAX8903B/E/G
MAX8903J
Load Regulation
CS to SYS Resistance
SYS to CS Leakage
BAT to SYS Resistance
BAT to SYS Reverse Regulation
Voltage
SYS Undervoltage Threshold
I
SYS
= 0 to 2A
MAX8903A/C/D/H
MAX8903B/E/G/J/N/Y
4.3
4.265
4.4
3.0
3.4
4.4
4.325
4.5
40
25
0.07
0.01
0.05
50
1.8
75
1.9
0.1
100
2.0
4.5
4.395
4.55
mV/A
Ω
µA
Ω
mV
V
V
V
V
USB
rising
V
DC
falling below DC UVLO to initiate USB soft-start
I
SYS
= I
BAT
= 0mA, V
CEN
= 5V
V
USUS
= 5V (USB suspend mode)
0
3.95
6.8
90
450
4.0
6.9
95
475
1.3
0.8
0.115
15
0.2
1
20
4.1
6.3
8
4.05
7.0
100
500
3
2
0.25
30
0.35
mV
Ω
ms
µs
mA
V
V
V
V
mA
No valid USB input
Valid USB input before soft-start
V
DCM
= 0V, V
IUSB
= 5V
V
DCM
= 0V, V
IUSB
= 0V
V
SYS
= 5.5V, V
DC
= 0V
450
90
CONDITIONS
MIN
TYP
1
20
475
95
0.01
500
100
MAX
UNITS
ms
µs
mA
mA
µA
V
DC
= 6V, V
DCM
= 5V, V
SYS
= 4V, I
CS
= 1A
V
SYS
= 5.5V, V
DC
= V
CS
= 0V
V
DC
= V
USB
= 0V, V
BAT
= 4.2V, I
SYS
= 1A
V
USB
= 5V, V
DC
= 0V, V
IUSB
= 0V, I
SYS
= 200mA
SYS falling, 200mV hysteresis (Note 4)
Maxim Integrated
3
MAX8903A–E/G/H/J/N/Y
2A 1-Cell Li+ DC-DC Chargers
for USB and Adapter Power
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)
PARAMETER
BATTERY CHARGER
MAX8903A/B/C/G/H
MAX8903D/E
BAT Regulation Voltage
(V
BATREG
)
I
BAT
= 0mA
MAX8903J
MAX8903Y/N
Charger Restart Threshold
BAT Prequal Threshold (V
BATPQ
)
Prequal Charge Current
Fast-Charge Current
DONE Threshold (I
TERM
)
R
ISET
Resistor Range
ISET Output Voltage
ISET Current Monitor Gain
BAT Leakage Current
Charger Soft-Start Time
Charger Thermal Limit
Temperature
Charger Thermal Limit Gain
CHARGER TIMER
Prequalification Time
Fast-Charge Time
Top-Off Timer (t
TOP-OFF
)
Timer Accuracy
Timer Extend Current Threshold
Timer Suspend Current Threshold
Percentage of fast-charge current below which the timer
clock operates at half-speed
Percentage of fast-charge current below which timer
clock pauses
C
CT
= 0.15µF
C
CT
= 0.15µF
MAX8903A/C/D/H/J/N/Y (fixed)
MAX8903B/E/G, C
CT
= 0.15µF
-15
40
16
50
20
33
660
15
132
+15
60
24
min
min
s
min
%
%
%
Charge current = 0 at +120°C
No DC or USB input
With valid input power, V
CEN
= 5V
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
4.179
4.158
4.079
4.059
4.328
4.307
4.129
4.109
-150
2.9
2.4
1800
900
450
0.6
1.5
1.25
0.05
3
1.0
100
5
4
6
4.200
4.200
4.100
4.100
4.350
4.350
4.150
4.150
-100
3.0
2.5
10
2000
1000
500
10
2.4
2200
1100
550
%
kΩ
V
mA/A
µA
ms
°C
%/°C
mA
4.221
4.242
4.121
4.141
4.372
4.394
4.171
4.192
-60
3.1
2.6
mV
V
%
V
CONDITIONS
MIN
TYP
MAX
UNITS
Change in V
BAT
from DONE to fast-charge
V
BAT
rising 180mV
hystersis
R
ISET
= 600Ω
R
ISET
= 1.2kΩ (MAX8903A/C/D)
R
ISET
= 2.4kΩ
Percentage of fast-charge, I
BAT
decreasing
MAX8903A/C/D/H/J/N/Y
MAX8903B/E/G
Percentage of fast-charge current set at ISET
4
Maxim Integrated
MAX8903A–E/G/H/J/N/Y
2A 1-Cell Li+ DC-DC Chargers
for USB and Adapter Power
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
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