LTC1729_15 Datasheet, PDF (12/16 Pages) Linear Technology – Li-Ion Battery Charger Termination Controllers

LTC1729 Series
TYPICAL APPLICATIO S
Wide Input Voltage Range 1A Charger
V_IN
3V TO 28V _{C3 +}
22µF
ON/OFF
R7 C6
100Ω 1µF
L1**
V_IN V_SW
S/S LT1512
V_FB
GND
V_C
I_FB
R5
470Ω
C5
0.1µF
C2*
D1
4.7µF _MBRS340
L2**
R4 39Ω
C4
0.33µF
R3
0.1Ω
LTC1729-8.4
OVP
V_CC
+
C7
10µF
+ C1
22µF
R1
×2
29.4k
R2
12.4k
Si9925
R6
0.1Ω
R_PULL-UP
47k
220k
BOOST
V⁺
CAP⁺
OSC
LTC1044
GND
LV
CAP^–
V_OUT
D2
1/2 BAT85S
D3
1/2 BAT85S
+
10µF
8.4V
BAT
V_C
SENSE STATUS
GND
NTC
R8
R8:10k NTC THERMISTOR, NTHS1206N02 VISHAY/DALE
NOTE: EITHER A THERMISTOR OR 10k RESISTOR MUST BE PRESENT
* TOKIN CERAMIC 1E225ZY5U-C203-F
** L1, L2 ARE TWO 10µH INDUCTORS: SUMIDA CDRH6D38-100
1729 TA01
Using STATUS Pin to Indicate Charge Status
TO V_CC
12V
8
V_CC
2.2k
7
V_C
LTC1729
10k
6
STATUS
5
NTC
PNP: MMBT3906
0.1µF
47k
2k
4.7k
2k
CONDITION
NO WALL ADAPTER
CHARGING (I_BAT > C/10)
CHARGING (I_BAT < C/10)
TIMER EXPIRED
AMBER
OFF
ON
OFF
OFF
GREEN
OFF
OFF
ON
ON
1729 TA03
AMBER LED
GREEN LED
12