MAX1679 Datasheet, PDF (6/12 Pages) Maxim Integrated Products – Single-Cell Li Battery Charger for Current-Limited Supply

Single-Cell Li+ Battery Charger
for Current-Limited Supply
CURRENT-LIMITED
VOLTAGE SOURCE
*
PFET
(800mA)
REVERSE-CURRENT
PROTECTION DIODE
IN
GATE
MAX1679
TRICKLE
CHARGE
(5mA)
5mA
TSEL
SEE TABLE 3
FOR TIMEOUT
OPTIONS
STATE
MACHINE 1.4V
TIMER
10kΩ
BATT REMOVED
30kHz
OSCILLATOR
HOT
QUAL
TEST
CURRENT
COLD
QUAL
TEST
CURRENT
1.4V
THERM
NTC THERMISTOR*
*OPTIONAL
**R_ADJ = 410kΩ ±1% FOR 4.1V CELL; LEAVE OPEN FOR 4.2V CELL.
CHG
BATT
1:3
ADJ 2.2µF
R_ADJ^**
1nF
SINGLE
Li+
CELL
5V
Figure 1. Functional Diagram
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