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| LTC3892_15 Datasheet, PDF (32/36 Pages) Linear Technology – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller | |||
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LTC3892/LTC3892-1
Typical Applications
VIN
4.5V TO 60V
VOUT1
3.3V
5A
COUT1A
470µF
CINA
100µF
CINB
2.2µF
x3 MTOP1
RSNS1
8mΩ
L1
4.7µH
RUN1 VIN RUN2
TG1
BOOST1
CB1
0.1µF
SW1
TG2
BOOST2
SW2
MTOP2
CB2
0.1µF
L2
8.0µH
COUT1B
10µF
RITH1
20k
CITH1A
1nF
MBOT1
BG1
BG2
MBOT2
CITH1B
100pF
CSS1
0.01µF
CSNS1
1nF
RPG1 100k
RPG2 100k
LTC3892
SENSE1+
SENSE2+
SENSE1â
VFB1
ITH1
TRACK/SS1
SENSE2â
VFB2
ITH2
TRACK/SS2
PGOOD1
PGOOD2
EXTVCC
ILIM
VPRG1
DRVSET
FREQ
PLLIN/MODE
CSNS2
1nF
VOUT2
CITH2B
OPT
CSS2
0.01µF
DRVUV
INTVCC GND DRVCC
CINTVCC
0.1µF
CDRVCC
4.7µF
RFREQ
41.2k
TOP1, TOP2, BOT1, BOT2: RJK0651DPB
L1: COILCRAFT SER1360-472KL
L2: COILCRAFT SER1360-802KL
COUT1A: SANYO 6TPE470M
COUT2A: SANYO 10TPE330M
RSNS2
10mΩ
COUT2B
10µF
VOUT2
8.5V*
3A
COUT2A
330µF
RA2
100k
RB2
10.5k
RITH2
34.8k
CITH2A
470pF
3892 TA03
*VOUT2 FOLLOWS VIN WHEN VIN ⤠8.5V
Figure 12. High Efficiency Dual 3.3V/8.5V Step-Down Converter with 6V Gate Drive
Efï¬ciency and Power Loss
vs Load Current
100
10k
90 EFFICIENCY
80
1k
70
60
100
50
40
POWER LOSS
10
30
20
10
0
0.0001
1
0.001 0.01
VIN = 12V
VOUT = 3.3V
0.1
0.1
1
10
LOAD CURRENT (A)
3892 TA03b
32
For more information www.linear.com/LTC3892
38921f
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