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LTC3891 Datasheet(PDF) 33 Page - Linear Technology

Part # LTC3891
Description  60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
PDF  40 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3891 Datasheet(HTML) 33 Page - Linear Technology

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LTC3890-2
33
38902f
Efficiency and Power Loss
vs Output Current
Efficiency vs Load Current
Efficiency vs Input Voltage
TYPICAL APPLICATIONS
Figure 13. High Efficiency Dual 8.5V/3.3V Step-Down Converter
MTOP2
SENSE1+
SENSE1–
VFB1
TRACK/SS2
ITH2
VFB2
SENSE2–
SENSE2+
ITH1
TRACK/SS1
ILIM
PHASMD
CLKOUT
PLLIN/MODE
SGND
EXTVCC
RUN1
RUN2
FREQ
PGOOD2
BG1
CITH1A 100pF
CITH1 1000pF
CSS2 0.01μF
CSS1 0.01μF
CITH2 470pF
C1
1nF
COUT1
470μF
RA1
31.6k
RITH1
34.8k
RB1
100k
RB2
100k
RFREQ
41.2k
RITH2
34.8k
MTOP1, MTOP2, MBOT1, MBOT2: RJK0651DPB
L1: COILCRAFT SER1360-472KL
L2: COILCRAFT SER1360-802KL
COUT1: SANYO 6TPE470M
COUT2: SANYO 10TPE330M
D1, D2: DFLS1100
D1
D2
LTC3890-2
RSENSE1
8mΩ
RSENSE2
10mΩ
L1
4.7μH
L2
8μH
MBOT1
TG1
MTOP1
VOUT1
3.3V
5A
2.2μF
×3
VIN
9V TO 60V
38902 TA02a
100k
PGOOD1
INTVCC
100k
CB1
0.1μF
RA2
10.5k
SW1
VOUT2
8.5V
3A
SW2
BOOST1
CB2 0.1μF
BOOST2
VIN
INTVCC
PGND
TG2
BG2
COUT2
330μF
CINT
4.7μF
CIN
100μF
MBOT2
C2
1nF
VOUT2
+
OUTPUT CURRENT (A)
0
70
100
1
0.1
0.01
0.001
0.0001
10
38902 TA02b
50
40
30
20
1
10
100
1000
10000
0.1
10
60
80
90
VIN = 12V
VOUT = 3.3V
BURST EFFICIENCY
FCM LOSS
PULSE-SKIPPING
LOSS
BURST LOSS
FCM EFFICIENCY
PULSE-SKIPPING
EFFICIENCY
OUTPUT CURRENT (A)
0
70
100
1
0.1
0.01
0.001
0.0001
10
38902 TA02c
50
40
30
20
10
60
80
90
VOUT = 8.5V
VOUT = 3.3V
VIN = 12V
INPUT VOLTAGE (V)
80
94
100
20
30 35 40 45 50 55 60
15
10
5
025
38902 TA02d
90
88
86
84
82
92
96
98
VOUT1 = 3.3V
VOUT2 = 8.5V
ILOAD = 2A



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