Linear Technology Analog Devices LT8708, Datasheet, Page: 64 / 64

LT8708
64
Rev 0
For more information www.analog.com
©
ANALOG DEVICES, INC. 2018
D16897-0-6/18(0)
www.analog.com
RELATED PARTS
TYPICAL APPLICATION
Supercapacitor Backup Supply Using CCM
CSPOUT
CSNOUT
EXTV
CC
FBOUT
INTV
CC
GATEV
CC
IMON_OP
IMON_INP
IMON_ON
IMON_INN
CLKOUT SYNC SS RT
V
C
MODE
CSNIN
TG1
LT8708
TG2
CSPIN
V
INCHIP
SHDN
FBIN
VINHIMON
VOUTLOMON
SWEN
LDO33
RVSOFF
DIR
350kHz
ICN
ICP
BOOST1 SW1 BG1 CSP CSN GND BG2 SW2 BOOST2
+ +
V
IN
12V
C
IN1
C
IN2
D
IN
LD033
C
OUT1
1.2k
× 6
C
OUT2
C
SC
× 6
V
OUT
15V
8708 TA02
5.6nF
124k 1µF
220pF
15k
22nF
6.8nF
17.4k
22nF
26.7k
6.8nF
17.4k
17.4k
D
B1
D
B2
TO
BOOST1
TO
BOOST2
4Ω
4.7µF
10k
4.7µF
100Ω
1µF
4.7µF
115k
25mΩ
TO DIODE
D
B1
TO DIODE
DB2
M4
0.22µF
2Ω 5mΩ
10Ω
1nF
1nF
10Ω
0.22µF
M3 M2
L1
2.2μH
2Ω
M1
TO LOADS
(REGULATE TO
11V WHEN
IN BACKUP)
25mΩ
100Ω
1µF
4.7µF
71.5k 162k
20k 20k
20k
200k
150k
50k
50k
M1–M4: INFINEON BSC050NE2LS
C
IN1
, C
OUT2
: 220μF, 35V 35HVP220M
C
IN2
, C
OUT1
: 22µF, 25V, TDK C4532X741E226M
C
SC
: 60F, 2.5V COOPER BUSSMAN HB1840-2R5606-R
SEE MORE DETAILS OF THIS APPLICATION ON PAGE 61. D
IN
: APPROPRIATE 2A SCHOTTKY DIODE OR IDEAL DIODE
SUCH AS LTC4358, LTC4412, LTC4352, ETC.
D
B1
, D
B2
: CENTRAL SEMI CMMR1U-02-LTE
L1: 2.2μH, VISHAY IHLP-5050CE-01-2R2-M-01
PART NUMBER DESCRIPTION COMMENTS
LT8708-1 80V Synchronous 4-Switch Buck-Boost DC/DC
Slave Controller for LT8708 Multiphase System
2.8V (Need EXTV
CC
> 6.4V) ≤ V
IN
≤ 80V,1.3V ≤ V
OUT
≤ 80V, 5mm × 8mm QFN-40
LT8705A 80V V
IN
and V
OUT
Synchronous 4-Switch Buck-
Boost DC/DC Controller
2.8V ≤ V
IN
≤ 80V, Input and Output Current Monitor, 5mm × 7mm QFN-38 and
TSSOP-38 Packages
LTC ® 3779 150V V
IN
and V
OUT
Synchronous 4-Switch Buck-
Boost Controller
4.5V ≤ V
IN
≤ 150V, 1.2V ≤ V
OUT
≤ 150V, Up to 99% Efficiency Drives Logic-Level
or STD Threshold MOSFETs, TSSOP-38 Package
LTC7813 60V Low I
Q
Synchronous Boost+Buck Controller
Low EMI and Low Input/Output Ripple
4.5V (Down to 2.2V After Start-Up) ≤ V
IN
≤ 60V, Boost V
OUT
Up to 60V,
0.8V ≤ Buck V
OUT
≤ 60V, I
Q
= 29µA, 5mm × 5mm QFN-32 Package
LTC3899 60V, Triple Output, Buck/Buck/Boost Synchronous
Controller with 29µA Burst Mode I
Q
4.5V (Down to 2.2V after Start-Up) ≤ V
IN
≤ 60V, V
OUT
Up to 60V,
Buck V
OUT
Range: 0.8V to 60V, Boost V
OUT
Up to 60V
LTM ® 8056 58V
IN
, Buck-Boost µModule Regulator, Adjustable
Input and Output Current Limiting
5V ≤ V
IN
≤ 58V, 1.2V ≤ V
OUT
≤ 48V, 15mm × 15mm × 4.92mm BGA Package
LTC3895/
LTC7801
150V Low I
Q
, Synchronous Step-Down
DC/DC Controller with 100% Duty Cycle
4V ≤ V
IN
≤ 140V, 150V ABS Max, PLL Fixed Frequency 50kHz to 900kHz,
0.8V ≤ V
OUT
≤ 60V, Adjustable 5V to 10V Gate Drive, I
Q
= 40μA,
4mm × 5mm QFN-24, TSSOP-24, TSSOP-38(31) Packages
LTC3871 Bidirectional Multiphase DC/DC Synchronous Buck
or Boost On-Demand Controller
V
IN
/V
OUT
Up to 100V, Ideal for High Power 48V/12V Automotive Battery
Applications
LTC7103 105V, 2.3A, Low EMI Synchronous
Step-Down Regulator
4.4V ≤ V
IN
≤105V, 1V ≤ V
OUT
≤ V
IN
, I
Q
= 2µA, Fixed Frequency 200kHz,
5mm × 6mm QFN Package