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

LTC4020
TYPICAL APPLICATION
Remote 24V to 55V (48V system) input to 12-cell Li-Ion (48V) PowerPath charger/system supply. 5A inductor current limit with 2.5A
battery charge current limit. Minimum V_IN is 24V as input regulation limits voltage loss due to line impedance. Battery termination
voltage is 48V with maximum output voltage of 52.8V. Instant-on functionality limits minimum regulated output voltage to 40.8V.
V_IN
24V TO 55V
1µF
+ _56µF
×2
R_SENSEA
0.01
Si7850DP
MBRS360
IHLP-5050FD-5A
22µH
Si7850DP
R_SENSEB
0.01
Si7850DP
Si7850DP
0.1µF
V_OUT
4.7µF
+ _56µF
×2
191k
10k
12k
SBR0560S1
4.7µF
PGND
INTV_CC
PV_IN
BG2
BG1
SW2
SW1
TG2
TG1
1µF
LTC4020
BST1
BST2
SGND
SGND
SENSGND
0.033µF
SENSBOT
SENSTOP
R_T, 100k
SENSVIN
RT
SHDN
VC
ITH
V_FBMAX
I_LIMIT
CSOUT
CSP
V_{IN_REG}
MODE
CSN
BGATE
STAT1
STAT2
TIMER
RNG_SS
BAT
V_FBMIN
FBG
VFB
NTC
SGND_BACK
SBR0560S1
BZX84C6V2L
1µF
33k
680pF
365k
1.5nF
2nF
20k
100Ω
0.33µF
100Ω
R_SENSE
0.02Ω
Si7465DP
20k
356k
R_NTC
10k
12-CELL Li-ION (48V)
4020 TA05
RELATED PARTS
PART NUMBER
LTC3789
LT3845
LT3650
LT3651
LT3652/LT3652HV
LTC4009
LTC4012
LT3741
LT8705
DESCRIPTION
COMMENTS
High Efficiency, Synchronous, 4 Switch Buck-Boost Controller
Improved LTC3780 with More Features
High Voltage Synchronous Current Mode Step-Down Controller
For Medium/High Power, High Efficiency Supplies
High Voltage 2A Monolithic Li-Ion Battery Charger
3mm × 3mm DFN-12 and MSOP-12 Packages
High Voltage 4A Monolithic Li-Ion Battery Charger
4A Synchronous Version of LT3650 Family
Power Tracking 2A Battery Chargers
Multi-Chemistry, Onboard Termination
High Efficiency, Multi-Chemistry Battery Charger
Low Cost Version of LTC4008, 4mm × 4mm QFN-20
High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control Similar to LTC4009 Adding PowerPath Control
High Power, Constant Current, Constant Voltage, Step-Down Controller Thermally Enhanced 4mm × 4mm QFN and 20-Pin TSSOP
80V_IN/V_OUT Sync Buck-Boost 4-SW Controller
Single Inductor, TSSOP-38 and 5mm × 7mm QFN-38
4020fb
42 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 950_Fo3_r5_m-7_o4_re1_i7_{nformation www.linear.com/LTC4020}
[phone] ^● FAX: [phone] ^● www.linear.com/LTC4020
LT 914 REV B • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2013