Typical operating characteristics, Electrical characteristics (continued) – Rainbow Electronics MAX8903A User Manual
Page 5
MAX8903A
2A 1-Cell Li+ DC-DC Charger for USB*
and Adapter Power
_______________________________________________________________________________________
5
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Sinking 1mA
8
50
Logic Output Voltage, Low
(CHG, FLT, DOK, UOK)
Sinking 10mA
80
mV
T
A
= +25°C
0.001
1
Open-Drain Output Leakage
C ur rent, Hi g h (CHG , FLT, DOK, UOK)
V
OUT
= 5.5V
T
A
= +85°C
0.01
µA
VL Output Voltage
V
DC
= V
USB
= 6V, I
VL
= 0 to 1mA
4.6
5
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 a low-dropout linear regulator is
connected from DC 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.)
0
20
10
40
30
60
50
70
90
80
100
1.0
2.0
2.5
1.5
3.0
3.5
4.0
4.5
5.0
BATTERY CHARGER EFFICIENCY
vs. BATTERY VOLTAGE
MAX8903A toc01
BATTERY VOLTAGE (V)
EFFICIENCY (%)
V
DC
= 12V
I
BATT
= 0.15A
V
DC
= 8V
V
DC
= 5V
I
BATT
= 1.5A
I
BATT
= 1.5A
0.0
0.5
1.0
1.5
2.0
2.5
3.0
4.0
3.5
4.5
4
8
6
10
12
14
16
SWITCHING FREQUENCY
vs. V
DC
MAX8903A toc02
DC VOLTAGE (V)
SWITCHING FREQUENCY (MHz)
V
BAT
= 3V
R
ISET
= 1.2k
Ω
CEN = 0V
V
BAT
= 4V
SYS EFFICIENCY vs. DC VOLTAGE
MAX8903A toc03
SYS OUTPUT CURRENT (mA)
SYS EFFICIENCY (%)
1000
100
10
10
20
30
40
50
60
70
80
90
100
0
1
10,000
V
DC
= 16V
V
DC
= 11V
V
DC
= 6V
V
DC
= 4.5V