LTC3827 Datasheet, PDF (36/36 Pages) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

LTC3827
TYPICAL APPLICATION
C_SS1
0.01μF
C_ITH1A
100pF
C_ITH1
1200pF
R_ITH1
10k
R_A1
68.1k
39pF
R_B1
215k
C1
1nF
R_A2
39.2k
C_ITH2
330pF
R_ITH2
15k
C_ITH2A
100pF
C_SS2
0.01μF
C2
1nF
R_B2
353k
High Efficiency Dual 3.3V/8V Step-Down Converter
LTC3827
I_TH1
TRACK/SS1
PGOOD2
V_FB1
PGOOD1
SENSE1⁺
TG1
SENSE1^–
SW1
PLLLPF
PHASMD
CLKOUT
PLLIN/MODE
SGND
RUN1
RUN2
BOOST1
BG1
V_IN
PGND
EXTV_CC
SENSE2^–
INTV_CC
SENSE2⁺
BG2
V_FB2
BOOST2
I_TH2
SW2
TRACK/SS2
TG2
FOLDDIS
100k
100k
C_B1 0.47μF
D1
C_INT2
1μF
D2 ^CB2
0.47μF
MTOP1 _L1
1.5μH
R_SNS1
5mΩ
MBOT1
C_OUT1
150μF
×2
C_INT1
4.7μF
C_IN1
10μF
C_IN2
10μF
V_OUT1
3.3V
10A
V_IN
12V
MTOP2 L2
7.2μH
R_SNS2
15mΩ
MBOT2
C_OUT2
150μF
V_OUT2
8V
2A
MTOP1, MTOP2, MBOT1, MBOT2: Si7848DP
L1: CDEP105-3R2M
L2: CDEP105-7R2M
C_OUT1, C_OUT2 : SANYO 10TPD150M
3827 TA06
RELATED PARTS
PART NUMBER
DESCRIPTION
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LTC1628-SYNC
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Controller
LTC3729
20A to 200A, 550kHz PolyPhase Synchronous Controller
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LTC3835/LTC3835-1 Low I_Q Synchronous Step-Down Controller
No R_SENSE is a trademark of Linear Technology Corporation.
36 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
COMMENTS
Reduces C_IN and C_OUT, Power Good Output Signal, Synchronizable,
3.5V ≤ V_IN ≤ 36V, I_OUT Up to 20A, 0.8V ≤ V_OUT ≤ 5V
Output Fault Protection, 16-Pin SSOP Package
Up to 97% Efficiency, 4V ≤ V_IN ≤ 36V, 0.8V ≤ V_OUT ≤ (0.9)(V_IN),
I_OUT Up to 20A
3.3V ≤ V_IN ≤ 60V, 100μA Quiescent Current
Current Mode, No R_SENSE, Up/Down Tracking, Synchronizable
0.8V ≤ V_OUT ≤ 14V; 4V ≤ V_IN ≤ 36V
Dual 180° Phased Controllers, V_IN 3.5V to 35V, 99% Duty Cycle,
5mm × 5mm QFN and SSOP-28 Packages
Expandable from 2-Phase to 12-Phase, Uses All Surface Mount
Components, V_IN Up to 36V
60A to 240A Output Current, 0.6V ≤ V_OUT ≤ 6V, 4.5V ≤ V_IN ≤ 32V
Single Channel LTC3827/LTC3827-1
3827ff
LT 0808 REV F • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2005