Datasheet

Stand-Alone Switch-Mode

Lithium-Ion Battery-Charger Controller

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

DCIN

= V

CSSN

= V

CSSP

= +18V, SHDN = VL, CELL = GND, V

BATT

= V

= +4.2V, V

VADJ

= V

REF

/ 2, ISETIN =

ISETOUT = REF, R

THM

= 10kΩ, T

= -40°C to +85°C, unless otherwise noted.) (Note 9)

Note 1: Battery Regulation Voltage = Number of Cells

× (3.979V + 0.10526 × V

VADJ

Note 2: This transconductance is for one cell. Divide by number of cells to determine actual transconductance.

Note 3: See Thermistor section.

Note 4: Below this threshold, the charger reverts to prequalification mode and I

CHG

is reduced to about 5% of full scale.

Note 5: Above this threshold, the charger returns to reset.

Note 6: After full-charge state is complete and peak inductor current falls below this threshold, FULLCHG output switches high.

Battery charging continues until top-off timeout occurs.

Note 7: After charging is complete, when BATT voltage falls below this threshold, a new charging cycle is initiated.

Note 8: In shutdown, charging ceases and battery drain current drops to 5µ A (max), but internal IC bias current remains on.

Note 9: Specifications to -40°C are guaranteed by design and not production tested.

SHDN Input Voltage Low (Note 8)

0.6

SHDN Input Voltage High

1.4 V

PARAMETER MIN TYP MAX UNITSCONDITIONS

CONTROL INPUTS/OUTPUTS

Maxim Integrated

MAX1737