Simple, Efficient, 1-Cell Li+ Pulse Charger
MAX1879
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
CHG
= +10V, V
BATT
= +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnected, THERM = 10kΩ to GND,
TA
= -40°C to +85°C,
unless otherwise noted.) (Note 5)
PARAMETER
THERM Sense Current (for hot
qualification)
THERM Sense Current (for cold
qualification)
THERM Sense Voltage Trip Point
GATE Source Current
GATE Sink Current
GATE Drive Current at Battery
Removal
V
IN
= 10V, V
GATE
= 8V
V
IN
= 10V, V
GATE
= 8V
V
BATT
= 5.1V, gate driven high
SYMBOL
CONDITIONS
MIN
342
47.3
1.358
60
15
15
MAX
363
50.3
1.442
140
35
90
UNITS
µA
µA
V
µA
µA
mA
Note 1:
The input voltage range is specified with the external PMOS FET off. When charging, the PMOS FET turns on, and the input
voltage (the output voltage of the current-limited source) drops to very near the battery voltage. When the PFET is on, V
IN
may be as low as 2.5V.
Note 2:
Restart Threshold tracks battery regulation voltage adjustment.
Note 3:
Glitches less than 1ms do not cause a restart.
Note 4:
This current is less than 1.5µA, even if an external R
ADJ
resistor is connected from ADJ to GND.
Note 5:
Specifications to -40°C are guaranteed by design and not production tested.
4
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
