LTC3851_15 Datasheet, PDF (28/28 Pages) Linear Technology – Synchronous Step-Down Switching Regulator Controller

LTC3851
TYPICAL APPLICATION
R_FREQ
160k
MODE/PLLIN V_IN
FREQ/PLLFLTR TG
V_IN
4.5V TO 22V
C_B
0.1μF
+ C_IN
22μF
M1A
25V
FDS6982S
0.1μF
C_SS
0.1μF
R_C
C_C
470pF
33k
C_C2
220pF
RUN
BOOST
LTC3851
TK/SS
SW
I_TH
INTV_CC
V_FB
BG
SENSE^–
GND
D_B
CMDSH-3
L1
3.3μH
4.7μF
M1B
FDS6982S
R_SENSE
0.01Ω
R2
32.4k
1% +
R1
25.5k
1%
V_OUT
1.8V
5A
C_OUT
150μF
6.3V
s2
PANASONIC SP
1000pF
10Ω 10Ω
SENSE⁺
I_LIM
C_OUT: PANASONIC EEFUEOG151R
C_IN: MARCON THCR70LE1H226ZT
L1: PANASONIC ETQP6F3R3HFA
R_SENSE: IRC LR 2010-01-R010F
3851 F13
Figure 13. 1.8V/5A Converter from Design Example with Pulse Skip Operation
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC3727A-1
LTC3728
Dual, 2-Phase Synchronous Controller
2-Phase 550kHz, Dual Synchronous Step-Down Controller
Very Low Dropout, V_OUT ≤ 14V
QFN and SSOP Packages
LTC3729/
LTC3729L-6
20A to 200A PolyPhase^® Synchronous Controllers
Expandable from 2-Phase to 12-Phase, Uses All Surface
Mount Components, No Heat Sink
LTC3731
3-Phase, 600kHz Synchronous Step-Down Controller
0.6V ≤ V_OUT ≤ 6V, 4.5V ≤ V_IN ≤ 32V, I_OUT ≤ 60A, Integrated
MOSFET Drivers
LTC3810
100V Current Mode Synchronous Nonisolated Switching
Regulator Controller
6.2V ≤ V_IN ≤ 100V, 0.8V ≤ V_OUT ≤ 0.9V_IN, No R_SENSE,
Tracking and Synchronizable
LTC3811
Dual, PolyPhase Synchronous Step-Down Controller, 20A to 200A Differential Remote Sense Amplifier, R_SENSE or DCR Current
Sense
LTC3826/LTC3826-1
LTC3834/LTC3834-1
LT^®3845
LTC3850/LTC3850-1/
LTC3850-2
Low I_Q Dual Synchronous Step-Down Controllers
Low I_Q Synchronous Step-Down Controllers
Low I_Q Synchronous Step-Down Controller
Dual, 2-Phase Synchronous Step-Down Controller
4V ≤ V_IN ≤ 36V, 0.8V ≤ V_OUT ≤ 10V, 30μA Quiescent Current
Single Channel LTC3826/LTC3826-1
4V ≤ V_IN ≤ 60V, 1.23V ≤ V_OUT ≤ 36V, 120μA Quiescent Current
R_SENSE or DCR Current Sensing, Tracking and Synchronizable
LTC3853
LTC3878
LTM4600HV
Triple Output, Multiphase Synchronous Step-Down Controller
No R_SENSE Wide Input Range Constant On-Time Synchronous
Step-Down Controller
10A Complete Switch Mode Power Supply
R_SENSE or DCR Current Sensing, Tracking and Synchronizable
Up to 97% Efficiency, 4V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ (0.9)(V_IN), I_OUT Up to 20A
92% Efficiency, V_IN: 4.5V to 28V, True Current Mode Control,
Ultrafast™ Transient Response
LTM4601AHV
12A Complete Switch Mode Power Supply
92% Efficiency, V_IN: 4.5V to 28V, True Current Mode Control,
Ultrafast Transient Response
PolyPhase is a registered trademark of Linear Technology Corporation. No R_SENSE and Ultrafast are trademarks of Linear Technology Corporation.
3851fb
28 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
LT 0409 REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2008