LTC4020_15 Datasheet, PDF (39/42 Pages) Linear Technology – 55V Buck-Boost Multi-Chemistry Battery Charger

LTC4020
TYPICAL APPLICATIONS
9V to 55V to 9-cell lead-acid (18V) charger/system supply with no PowerPath.
External 5V regulator for boosted supplies. 5A inductor current limit with 1.67A battery charge current limit.
21.5V absorption voltage output, 19.9V float voltage output.
V_IN
9V TO 55V
1µF
56µF
×2
V_IN
OUT
LT3010-5
SHDN SENSE
GND
249k
100k
R_SENSEA
0.01
Si7960DP
CMSH3-40MA
XAL1010-153MEB
15µH
Si7850DP
R_SENSEB
0.01
Si7272DP
Si7272DP
V_OUT
0.1µF
4.7µF
+ _56µF
×3
SBR0560S1
1µF
4.7µF
PGND
INTV_CC
0.033µF
R_T, 100k
PV_IN
BG1
SW1
TG1
BST1
BG2
SW2
TG2
BST2
LTC4020
SGND
SGND
VC
SENSGND
ITH
SENSBOT
SENSTOP
V_FBMAX
SENSVIN
I_LIMIT
CSOUT
RT
CSP
SHDN
V_{IN_REG}
MODE
STAT1
STAT2
CSN
BGATE
BAT
V_FBMIN
FBG
TIMER
VFB
RNG_SS
SGND_BACK ^NTC
SBR0560S1
BZX84C6V2L
1µF
43k
43k
680pF
100pF
1.5nF
100Ω
0.33µF _100Ω
R_SENSE
0.03Ω
75.9k
10k
9-CELL LEAD-ACID (18V)
4020 TA04
For more information www.linear.com/LTC4020
4020fb
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