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LTC3826-1 Datasheet, PDF (28/32 Pages) Linear Technology – 30μA IQ, Dual, 2-Phase Synchronous Step-Down Controller
LTC3826-1
TYPICAL APPLICATIONS
High Efficiency Dual 5V/9.5V Step-Down Converter
CSS1
0.01μF
CITH1A
100pF
39pF
CITH1
470pF
RITH1
24.2k
RA1
69.8k
RB1
365k
C1
1nF
ITH1
TRACK/SS1
VFB1
SENSE1+
PGOOD1
TG1
SENSE1–
SW1
PLLLPF
BOOST1
R2
100k
CB1 0.47μF
MTOP1 L1
3.3μH
RSNS1
12mΩ
COUT1
150μF
VOUT1
5V
5A
RA2
39.2k
CITH2
330pF
RITH2
105k
CITH2A
68pF
CSS2
0.01μF
C2
1nF
22pF
RB2
432k
PLLIN/MODE
BG1
SGND
VIN
LTC3826-1
RUN1
PGND
RUN2
SENSE2–
SENSE2+
EXTVCC
INTVCC
BG2
VFB2
BOOST2
ITH2
SW2
TRACK/SS2
TG2
D1
CINT2
4.7μF
D2 CB2
0.47μF
MBOT1
VIN
12V
CIN1
10μF
CIN2
10μF
MTOP2 L2
7.2μH
RSNS2
12mΩ
MBOT2
VOUT2
COUT2
150μF
9.5V
3A
Efficiency vs Output Current
100
VOUT = 5V
90
VOUT = 9.5V
80
70
60
50
40
30
20
10
0
0.000001 0.00001 0.0001 0.001 0.01 0.1
OUTPUT CURRENT (A)
1 10
3827 F14a
28
MTOP1, MTOP2, MBOT1, MBOT2: Si7848DP
L1: CDEP105-3R2M
L2: CDEP105-7R2M
COUT1, COUT2 = SANYO 10TPD150M
Start-Up
VOUT2, 2V/DIV
VOUT1, 2V/DIV
SW1
5V/DIV
SW2
5V/DIV
3826 F14b
38261 TA03
SW Node Waveform
3826 F14c
38261fb