LT8710_15 Datasheet, PDF (38/44 Pages) Linear Technology – Synchronous SEPIC/ Inverting/Boost Controller with Output Current Control

LT8710
Typical Application
300kHz, 4.5V to 25V Input to –5V Output Delivers Up to 7A Output Current
V_IN
4.5V TO 25V
L1
2.2µH
C_IN1
10µF
×4
+ _CIN2
120µF
13.3k
10k
2.2µF
118k
C1
10µF ×2
L2
2.2µH
MN
1.5m
R_SENSE1
499Ω
BG
V_IN
EN/FBIN
MODE
INTV_CC
RT
0.47µF
CSN CSP TG
ISN
ISP
LT8710
BIAS
INTV_EE
FBX
FLAG
MP
D1
R_SENSE2
4m
INTV_CC
2.2µF
V_OUT
–5V
7A
C_OUT2
330µF
C_OUT1
100µF
×2
60.4k
SYNC
GND
V_C
IMON
47nF
SS
220nF
100pF
11.5k
3.3nF
8710 TA02a
L1, L2: WÜRTH 2.2µH WE-CFWI 74485540220
MN: FAIRCHILD FDMS8333L
MP: FAIRCHILD FDD4141
R_SENSE1: 1.5mΩ 2010
RSENSE2: 4mΩ 2512
D1: NXP PMEG2010EA
C_IN1: 10µF, 50V, 1210, X7S
C_IN2: OSCON 120µF, 35V, 35SVPF120M
C_OUT1: 100µF, 6.3V, 1812, X5R
C_OUT2: OSCON 330µF, 16V, 16SEQP330M
C1: 10µF, 50V, 1210, X7S
100
90
80
70
65
50
40
30
20
0
Efficiency and Power Loss
8
7
6
5
4
3
2
V_IN = 5V 1
V_IN = 12V
0
12 3 4 5 67
LOAD CURRENT (A)
8710 TA02b
Transient Response with 2A to 5.5A to 2A
Output Load Step (V_IN = 12)
V_OUT
200mV/DIV
AC-COUPLED
LOAD STEP
5A/DIV
I_L1 + I_L2
5A/DIV
200µs/DIV
8710 TA02c
8710f
38
For more information www.linear.com/LT8710