LTC3868IUH#TRPBF Linear Technology, LTC3868IUH#TRPBF Datasheet - Page 31

• Manufacturer Part Number: LTC3868IUH#TRPBF
• Description: IC CTRLR STP-DN SYNC DUAL 32QFN
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3868IUH#TRPBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 14 V
• Frequency - Switching: 50kHz ~ 900kHz
• Voltage - Input: 4 ~ 24 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -

TYPICAL APPLICATIONS
100
0.00001 0.0001
90
80
70
60
50
40
30
20
10
0
V
Effi ciency vs Output Current
OUT
= 8.5V
OUTPUT CURRENT (A)
0.001
C
C
ITH2
44.2k
ITH1
68.1k
R
R
A2
A1
C
680pF
820pF
ITH1A
V
0.01
V
Burst Mode OPERATION
OUT
IN
215k
422k
15pF
39pF
R
= 12V
R
C
C
150pF
= 3.3V
B1
B2
F1
C
F2
C
SS1
R
R
ITH2A
0.1
ITH1
ITH2
C
L1: SUMIDA CDEP105-3R2M
L2: SUMIDA CDEP105-7R2M
MTOP1, MTOP2, MBOT1, MBOT2: VISHAY Si7848DP
0.1μF
OUT1
C
1nF
1nF
SS2
C1
100pF
C2
15k
27k
, C
0.1μF
1
Figure 12. High Effi ciency Dual 8.5V/3.3V Step-Down Converter
OUT2
3868 F12b
: SANYO 10TPD150M
10
SENSE1
SENSE1
V
I
SS1
I
PHASMD
CLKOUT
PLLIN/MODE
SGND
EXTV
RUN1
RUN2
FREQ
SS2
I
V
SENSE2
SENSE2
TH1
LIM
TH2
FB1
FB2
CC
LTC3868
+
–
–
+
PGOOD2
PGOOD1
BOOST1
BOOST2
INTV
PGND
SW1
SW2
BG1
TG1
TG2
BG2
V
CC
IN
100k
100k
Start-Up
20ms/DIV
INTV
D1
D2
CC
C
0.47μF
C
0.47μF
B1
B2
C
4.7μF
INT
3868 F12c
V
2V/DIV
V
2V/DIV
MBOT1
MTOP1
MTOP2
MBOT2
OUT2
OUT1
C
22μF
IN
3.3μH
7.2μH
L1
L2
V
9V TO 24V
5V/DIV
5V/DIV
IN
SW1
SW2
R
R
SENSE1
SENSE2
6mΩ
8mΩ
3868 F12
SW Node Waveforms
C
150μF
C
150μF
OUT1
OUT2
1μs/DIV
V
8.5V
3A
V
3.3V
5A
OUT2
LTC3868
OUT1
31
3868 F12d
3868fd