LTC3862_15 Datasheet, PDF (42/42 Pages) Linear Technology – Multi-Phase Current Mode Step-Up DC/DC Controller

LTC3862
Typical Application
A 12V Input, 24V/5A Output 2-Phase Boost Converter Application Circuit
45.3k
10nF
1nF
26.7k
100pF
6.98k
130k
V_OUT
D_MAX
SLOPE
3V8
SENSE1⁺
BLANK
PHASEMODE SENSE1^–
FREQ
RUN
SS
LTC3862 ^VIN
ITH
FB
SGND
INTV_CC
GATE1
PGND
CLKOUT
SYNC
PLLFLTR
GATE2
SENSE2^–
SENSE2⁺
V_IN
5V TO 24V
L1
4.2µH
CDEP145-4R2
1nF
10Ω
10nF
15k
100k
1µF
4.7µF
22µF 25V
22µF 25V
22µF 25V
10Ω
10nF
L2
4.2µH
CDEP145-4R2
D1
MBRD835L
Q1
Si7386DP
0.007Ω
1W
100µF
35V
100µF _{10µF 50V}
35V
0.007Ω
1W
Q2
Si7386DP
D2
MBRD835L
10µF 50V
10µF 50V
10µF 50V
V_OUT
24V
5A (MAX)
3862 TA04
Related Parts
PART NUMBER
LTC3787/
LTC3787-1
LTC3788-1
LTC3786
DESCRIPTION
Single Output, Dual Channel Multiphase Synchronous
Step-Up Controller
Dual Output, Multiphase Synchronous Step-Up
Controller
Low IQ Synchronous Step-Up Controller
LT3757A
Boost, Flyback, SEPIC and Inverting Controller
LTC3859AL
LTC3789
Low I_Q, Triple Output Buck/Buck/Boost Synchronous
DC/DC Controller
High Efficiency Synchronous 4-Switch Buck-Boost
DC/DC Controller
COMMENTS
4.5V (Down to 2.5V After Start-Up) ≤ V_IN ≤ 38V, V_OUT Up to 60V, 50kHz to
900kHz Operating Frequency, 4mm × 5mm QFN-28, SSOP-28
4.5V (Down to 2.5V After Start-Up) ≤ V_IN ≤ 38V, V_OUT Up to 60V, 50kHz to
900kHz Fixed Frequency, 5mm × 5mm QFN-32, SSOP-28
4.5V (Down to 2.5V After Start-Up) ≤ V_IN ≤ 38V, V_OUT Up to 60V, 50kHz to
900kHz Fixed Operating Frequency, 3mm × 3mm QFN-16, MSOP-16E
2.9V ≤ V_IN ≤ 40V, Current Mode Control, 100kHz to 1MHz Programmable
Operation Frequency, 3mm × 3mm DFN-10 and MSOP-10E Packages
All Outputs Remain in Regulation Through Cold Crank, 4.5V (Down to 2.5V
After Start-Up) ≤ V_IN ≤ 38V, V_OUT(BUCKS) Up to 24V, V_OUT(BOOST) Up to 60V,
I_Q = 28μA
4V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 38V, 4mm × 5mm QFN-28, SSOP-28
42 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 950_Fo3_r5_m-7_o4_re1_i7_{nformation www.linear.com/LTC3862}
[phone] ^● FAX: [phone] ^● www.linear.com
3862fc
LT 1213 REV C • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2008