LTC3850-2_15 Datasheet, PDF (36/36 Pages) Linear Technology – Dual, 2-Phase Synchronous Step-Down Switching Controller

LTC3850-2
TYPICAL APPLICATION
2.55k
1nF
7.5k
0.1μF
220pF
2.2nF
2.74k
20k
20k
0.1μF
10k
RUN
SENSE1^– SENSE1⁺ RUN1 FREQ MODE SW1 TG1
TK/SS1
I_TH1
V_FB1
V_FB2
I_TH2
TK/SS2
SENSE2^–
LTC3850-2
BOOST1
BG1
V_IN
INTV_CC
BG2
PGND
BOOST2
SENSE2⁺ SGND RUN2 EXTV_CC PGOOD SW2 TG2
0.1μF
PGOOD
20k
100k
0.1μF
CMDSH-3
2.2Ω
4.7μF
1μF
CMDSH-3
0.1μF
RJK0305DPB
2.21k
L1
0.56μH
RJK0301DPB
RJK0305DPB
L2
0.56μH
RJK0301DPB
2.21k
RUN
L1, L2: VISHAY IHLP4040DZ-01 0.56μH
C_OUT: SANYO 2R5TPE330M9
FOR SINGLE OUTPUT, DUAL PHASE OPERATION, TIE THE FOLLOWING PINS TOGETHER:
V_FB1 TO V_FB1
ITH1 TO ITH2
TK/SS1 TO TK/SS2
RUN1 TO RUN2
Figure 21. 1.1V/30A Dual Phase Core Converter, F_SW = 400kHz
38502 TA02
+
10μF
2x
V_IN
7V TO 14V
180μF
+
100μF
2x
V_OUT
1.1V/30A
C_OUT1
330μF
2.5V
4x
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Expandable from 2-Phase to 12-Phase,
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Regulator Controller
Single Output Version of LTC3850-2
4V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5.5V
PolyPhase is a registered trademark of Linear Technology Corporation. No R_SENSE is a trademark of Linear Technology Corporation.
38502f
36 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
LT 0908 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2007