English
Language : 

LTC3827 Datasheet, PDF (32/36 Pages) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller
LTC3827
TYPICAL APPLICATION
High Efficiency Dual 5V/9.5V Step-Down Converter
CSS1
0.01μF
CITH1A
100pF
CITH1
470pF
RITH1
10k
RA1
69.8k
RB1
365k
C1
1nF
RA2
39.2k
CITH2
330pF
RITH2
15k
CITH2A
100pF
CSS2
0.01μF
C2
1nF
RB2
432k
LTC3827
ITH1
TRACK/SS1
PGOOD2
VFB1
PGOOD1
SENSE1+
TG1
SENSE1–
SW1
PLLLPF
PHASMD
CLKOUT
PLLIN/MODE
SGND
RUN1
RUN2
BOOST1
BG1
VIN
PGND
EXTVCC
SENSE2–
INTVCC
SENSE2+
BG2
VFB2
BOOST2
ITH2
SW2
TRACK/SS2
TG2
FOLDDIS
100k
100k
CB1 0.47μF
D1
CINT2
1μF
D2 CB2
0.47μF
MTOP1 L1
3.3μH
RSNS1
12mΩ
COUT1
150μF
VOUT1
5V
5A
MBOT1
VIN
12V
CINT1
4.7μF
CIN1
10μF
CIN2
10μF
MTOP2 L2
7.2μH
RSNS2
12mΩ
MBOT2
COUT2
150μF
VOUT2
9.5V
3A
MTOP1, MTOP2, MBOT1, MBOT2: Si7848DP
L1: CDEP105-3R2M
L2: CDEP105-7R2M
COUT1, COUT2 : SANYO 10TPD150M
3827 TA03
Efficiency vs Load Current
100
VOUT = 5V
90
VOUT = 9.5V
80
70
60
50
40
30
20
10
0
0.001 0.01
0.1 1 10 100 1000 10000
LOAD CURRENT (mA)
3827 F16
32
Start-Up
VOUT2
2V/DIV
VOUT1
2V/DIV
SW Node Waveform
SW1
5V/DIV
SW2
5V/DIV
20ms/DIV
3827 F17
1μs/DIV
3827 F18
3827ff