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| LTC3892_15 Datasheet, PDF (31/36 Pages) Linear Technology – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller | |||
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Typical Applications
LTC3892/LTC3892-1
VIN
8V TO 60V
VOUT1
5V
8A
COUT1A
220µF
COUT1B
10µF
TOP1, TOP2: BSC057N08NS3
BOT1, BOT2: BSC036NE7NS3
L1: COILCRAFT XAL1010-562ME
L2: COILCRAFT XAL1010-153ME
CINA
47µF
CINB
2.2µF
x5 MTOP1
RSNS1
5mΩ
L1
5.6µH
CB1
0.1µF
RUN1 VIN RUN2
TG1
BOOST1
TG2
BOOST2
SW1
SW2
MTOP2
CB2
0.1µF
L2
15µH
RITH1
7.5k
CITH1A
2.2nF
MBOT1
BG1
BG2
MBOT2
CITH1B
100pF
CSNS1
1nF
CSS1
0.1µF
RPG1
1000k
RPG2
1000k
LTC3892
SENSE1+
SENSE2+
SENSE1â
VFB1
ITH1
TRACK/SS1
SENSE2â
VFB2
ITH2
TRACK/SS2
PGOOD1
PGOOD2
VPRG1
DRVSET
EXTVCC
ILIM
FREQ
PLLIN/MODE
CSNS2
1nF
VOUT2
CITH2B
100pF
CSS2
0.1µF
DRVUV
INTVCC GND DRVCC
CINTVCC
0.1µF
CDRVCC
4.7µF
RFREQ
35.7k
RSNS2
8mΩ
COUT2B
10µF
VOUT2
12V*
5A
COUT2A
150µF
RA2
100k
RB2
7.15k
RITH2
34.8k
CITH2A
1nF
3892 TA02
*VOUT2 FOLLOWS VIN WHEN VIN ⤠12V
Figure 11. High Efficiency Dual 5V/12V Step-Down Converter with 10V Gate Drive
Efï¬ciency and Power Loss
vs Load Current
100
10k
90
80
EFFICIENCY
1k
70
60
100
50
40
10
POWER LOSS
30
20
10
0
0.0001
0.001 0.01 0.1
LOAD CURRENT (A)
1
VIN = 12V
VOUT = 5V
0.1
1
10
3892 TA02b
For more information www.linear.com/LTC3892
38921f
31
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