LTC3826 Linear Technology, LTC3826 Datasheet - Page 31

• Manufacturer Part Number: LTC3826
• Description: 2-Phase Synchronous Step-Down Controller
• Manufacturer: Linear Technology

www.datasheet4u.com
TYPICAL APPLICATIONS
0.01μF
0.01μF
330pF
C
560pF
C
C
C
100
SS1
ITH2
0.000001
ITH1
SS2
90
80
70
60
50
40
30
20
10
0
C
C
180pF
56pF
ITH1A
ITH2A
Effi ciency vs Output Current
22.1k
R
68.1k
R
52.3k
R
0.00001 0.0001 0.001 0.01
34k
R
ITH1
A2
ITH2
A1
V
V
OUT
OUT
OUTPUT CURRENT (A)
= 3.3V
= 8.5V
39pF
39pF
R
215k
R
215k
B1
B2
C1
470pF
C2
470pF
0.1
Figure 13. High Effi ciency Dual 8.5V/3.3V Step-Down Converter
I
V
SENSE1
SENSE1
PLLLPF
PHASMD
CLKOUT
PLLIN/MODE
SGND
RUN1
RUN2
SENSE2
SENSE2
V
I
TRACK/SS2
TH1
TH2
FB1
FB2
1
3826 F13a
LTC3826
+
–
–
+
10
TRACK/SS1
FOLDDIS
PGOOD2
PGOOD1
BOOST1
BOOST2
EXTV
INTV
PGND
SW1
SW2
TG1
BG1
BG2
TG2
V
CC
CC
IN
MTOP1, MTOP2, MBOT1, MBOT2: Si7848DP
L1: CDEP105-2R2M
L2: CDEP105-7R2M
C
OUT1
, C
OUT2
= SANYO 10TPD150M
100k
Start-Up
D2
D1
C
4.7μF
C
B1
100k
INT2
0.47μF
V
V
OUT2
OUT1
, 2V/DIV
, 2V/DIV
3826 F13b
MTOP1
MBOT1
MTOP2
MBOT2
5V/DIV
5V/DIV
SW1
SW2
2.2μH
7.2μH
L1
L2
10μF
C
IN1
R
12mΩ
R
15mΩ
SNS1
SNS2
3826 TA02
SW Node Waveform
10μF
C
IN2
LTC3826
C
150μF
OUT1
C
150μF
OUT2
V
V
12V
V
8.5V
3.5A
3.3V
OUT2
OUT1
IN
5A
31
3826 F13c
3826fc