Datasheet

MAX8903A–E/G/H/J/N/Y
2A 1-Cell Li+ DC-DC Chargers
for USB and Adapter Power
6
Maxim Integrated
MAX8903A–E/G/H/J/N/Y
PARAMETER CONDITIONS MIN TYP MAX UNITS
I
VL
= 0 to 1mA
(MAX8903A/C/D/H/J/N/Y)
4.6 5.0 5.4
VL Output Voltage V
DC
= V
USB
= 6V
I
VL
= 0 to 10mA
(MAX8903B/E/G)
4.6 5.0 5.4
V
VL UVLO Threshold V
VL
falling; 200mV hysteresis 3.2 V
Thermal Shutdown Temperature 160 °C
Thermal Shutdown Hysteresis 15 °C
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)
Note 1: Limits are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2: For the 100mA USB mode using the DC input, the step-down regulator is turned off and its high-side switch operates as a
linear regulator with a 100mA current limit. The linear regulator’s output is connected to LX and its output current flows
through the inductor into CS and finally to SYS.
Note 3: For the 500mA USB mode, the actual current drawn from USB is less than the output current due to the input/output current
ratio of the DC-DC converter.
Note 4: For short-circuit protection, SYS sources 25mA below V
SYS
= 400mV, and 50mA for V
SYS
between 400mV and 2V.
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
MAX8903A/B/C/D/E/H/J/N/Y
BATTERY CHARGER EFFICIENCY
vs. BATTERY VOLTAGE
MAX8903A toc01
BATTERY VOLTAGE (V)
EFFICIENCY (%)
4.54.03.0 3.52.0 2.51.5
10
20
30
40
50
60
70
80
90
100
0
1.0 5.0
V
DC
= 8V
I
BAT
= 0.15A I
BAT
= 1.5A
V
DC
= 5V
V
DC
= 12V
MAX8903G BATTERY CHARGER
EFFICIENCY vs. BATTERY VOLTAGE
MAX8903A toc01a
BATTERY VOLTAGE (V)
EFFICIENCY (%)
4.54.03.0 3.52.0 2.51.5
10
20
30
40
50
V
DC
= 12V
I
BATT
= 0.15A I
BATT
= 1.5A
60
70
80
90
100
0
1.0 5.0
V
DC
= 6V
V
DC
= 9V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
4.0
3.5
4.5
486 10121416
MAX8903A/B/C/D/E/H/J/N/Y
SWITCHING FREQUENCY vs. V
DC
MAX8903A toc02
DC VOLTAGE (V)
SWITCHING FREQUENCY (MHz)
V
BAT
= 3V
R
ISET
= 1.2kΩ
V
CEN
= 0V
V
BAT
= 4V