 English |
|
|
|
|
|
|
|
| LTC3890-2 Datasheet, PDF (33/40 Pages) Linear Technology – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller | |||
| |||
| ◁ |
TYPICAL APPLICATIONS
LTC3890-2
RA1
31.6k
RB1
100k
CITH1A 100pF
SENSE1+
C1
1nF
SENSE1â
VFB1
PGOOD1
PGOOD2
BG1
CITH1 1000pF
RITH1
34.8k
CSS1 0.01μF
SW1
ITH1
BOOST1
LTC3890-2
TRACK/SS1
TG1
ILIM
PHASMD
CLKOUT
PLLIN/MODE
VIN
INTVCC
RFREQ
41.2k
VOUT2
CSS2 0.01μF
CITH2 470pF
RITH2
34.8k
SGND
EXTVCC
RUN1
RUN2
FREQ
PGND
TG2
TRACK/SS2 BOOST2
SW2
ITH2
RA2
10.5k
RB2
100k
VFB2
BG2
SENSE2â
C2
1nF
SENSE2+
INTVCC
100k
100k
CB1
0.1μF
D1
CINT
4.7μF
D2
CB2 0.1μF
MBOT1 RSENSE1
8mΩ
L1
4.7μH
COUT1
470μF
MTOP1
+ CIN
100μF
MTOP2
L2
8μH
RSENSE2
10mΩ
MBOT2
VOUT1
3.3V
5A
VIN
9V TO 60V
2.2μF
Ã3
VOUT2
8.5V
3A
COUT2
330μF
38902 TA02a
MTOP1, MTOP2, MBOT1, MBOT2: RJK0651DPB
L1: COILCRAFT SER1360-472KL
L2: COILCRAFT SER1360-802KL
COUT1: SANYO 6TPE470M
COUT2: SANYO 10TPE330M
D1, D2: DFLS1100
Figure 13. High Efficiency Dual 8.5V/3.3V Step-Down Converter
Efficiency and Power Loss
vs Output Current
100
VIN = 12V
90 VOUT = 3.3V
80
BURST EFFICIENCY
10000
1000
70
FCM LOSS
60
100
50
PULSE-SKIPPING
40 LOSS
BURST LOSS
30
20
FCM EFFICIENCY
10
0
0.0001
PULSE-SKIPPING
EFFICIENCY
0.001 0.01 0.1
1
OUTPUT CURRENT (A)
10
1
0.1
10
38902 TA02b
Efficiency vs Load Current
100
90 VOUT = 8.5V
80
VOUT = 3.3V
70
60
50
40
30
20
10
0 VIN = 12V
0.0001 0.001 0.01 0.1
1
10
OUTPUT CURRENT (A)
38902 TA02c
Efficiency vs Input Voltage
100
98
96
VOUT2 = 8.5V
94
92
90
88
VOUT1 = 3.3V
86
84
82
80 ILOAD = 2A
0 5 10 15 20 25 30 35 40 45 50 55 60
INPUT VOLTAGE (V)
38902 TA02d
38902f
33
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese