ltc3827ig-1 Linear Technology Corporation, ltc3827ig-1 Datasheet - Page 28

• Manufacturer Part Number: ltc3827ig-1
• Description: Low Iq, Dual, 2-phase Synchronous Step-down Controller
• Manufacturer: Linear Technology Corporation

LTC3827-1
28
TYPICAL APPLICATIO
100
90
80
70
60
50
40
30
20
10
0.001
0
Efficiency vs Load Current
0.01
0.01μF
V
V
0.01μF
CSS2
470pF
CSS1
C
C
330P
OUT
OUT
ITH1
ITH2
0.1
LOAD CURRENT (mA)
C
= 5V
= 9.5V
C
100P
100P
ITH2A
ITH1A
R
69.8k
39.2k
R
RA1
RA2
10k
1
15k
ITH1
ITH2
10
RB2
432k
RB1
365k
C1
1nF
C2
1nF
100 1000 10000
38271 F16
U
I
V
SENSE1
SENSE1
PLLLPF
PLLIN/MODE
SGND
RUN1
RUN2
SENSE2
SENSE2
V
I
TRACK/SS2
TH1
TH2
FB1
FB2
High Efficiency Dual 5V/9.5V Step-Down Converter
LTC3827-1
+
–
–
+
TRACK/SS1
PGOOD1
BOOST1
BOOST2
Start-Up
EXTV
INTV
PGND
SW1
SW2
TG1
BG1
BG2
TG2
V
CC
CC
IN
MTOP1, MTOP2, MBOT1, MBOT2: Si7848DP
L1: CDEP105-3R2M
L2: CDEP105-7R2M
C
OUT1
, C
OUT2
20ms/DIV
= SANYO 10TPD150M
D1
D2
CB1 0.47μF
0.47μF
C
1μF
CB2
INT2
100k
R2
2V/DIV
2V/DIV
V
V
OUT2
OUT1
38271 F17
+
4.7μF
C
INT1
5V/DIV
5V/DIV
MTOP1
MBOT1
MTOP2
MBOT2
SW1
SW2
SW Node Waveform
3.3μH
7.2μH
L1
L2
10μF
C
IN1
RSNS1
RSNS2
12mΩ
12mΩ
38271 TA03
10μF
C
IN2
1μs/DIV
C
150μF
OUT1
C
150μF
OUT2
12V
V
V
V
9.5V
OUT2
OUT1
IN
3A
5V
5A
38271 F18
38271fd