Datasheet

MAX1736
SOT23, Single-Cell Li+ Battery Charger
for Current-Limited Supply
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ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 10V, V
BATT
= 4.2V for MAX1736EUT42 or 4.1V for MAX1736EUT41, T
A
= 0°C to +85°C. Typical values are at T
A
= +25°C,
unless otherwise noted.)
ELECTRICAL CHARACTERISTICS
(V
IN
= 10V, V
BATT
= 4.2V for MAX1736EUT42 or 4.1V for MAX1736EUT41, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
CT Pullup Current -12 -10 -8
µA
Minimum On-Time C
CT
= 0.33µF 165 ms
Minimum Off-Time C
CT
= 0.33µF 33 ms
EN Pullup Resistance 175 350 725 kΩ
PARAMETER CONDITIONS MIN MAX UNITS
Input Voltage (Note 4) External P-MOSFET off 4.7 22 V
Fast-Charge BATT Qualification
Threshold
BATT rising, transition from precharge to fast charge 2.4 2.65 V
MAX1736EUT42 4.158 4.242 V
BATT Regulation Voltage
MAX1736EUT41 4.058 4.142
BATT Removal Detection
Threshold
BATT rising 4.85 5.125 V
BATT Input Current, Input Power
Removed
V
IN
≤ V
BATT
- 0.3V 1 µA
BATT Input Current, Charger
Disabled
EN = GND, V
BATT
= 0 to 5V 6 µA
BATT Input Current, When
Charging
0.75 mA
Precharge Source Current V
BATT
= 2V 3 8 mA
IN Input Current 1mA
GATE Source/Sink Current 60 140 µA
GATE Drive Source Current at
Battery Removal
V
BATT
= 5.1V 10 90 mA
EN Logic High Threshold 2 V
EN Logic Low Threshold 0.7 V
CT Pulldown Current 1.5 2.5 µA
CT Pullup Current -12 -8 µA
EN Pullup Resistance 170 725 kΩ
Note 3: All devices are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by
design.
Note 4: The input voltage range is specified with the external PFET off. When charging, the PFET turns on and the input voltage (the
output voltage of the constant-current power source) drops to very near the battery voltage. When the PFET is on, IN may be
as low as 2.5V.
Note 5: Every 20s (for CT = 0.33µF) the MAX1736 turns off the external P-channel MOSFET and samples IN to determine if input
power is present. If input power is removed, the charger shuts down.
Note 6: For design guidance, not tested.