LTC3890EGN-1#PBF Linear Technology, LTC3890EGN-1#PBF Datasheet - Page 32

• Manufacturer Part Number: LTC3890EGN-1#PBF
• Description: IC BUCK SYNC ADJ 25A DUAL 28SSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC3890EGN-1#PBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 24 V
• Current - Output: 25A
• Frequency - Switching: 50kHz ~ 900kHz
• Voltage - Input: 4 ~ 60 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Primary Input Voltage: 12V
• No. Of Outputs: 2
• Output Voltage: 24V
• Output Current: 25A
• No. Of Pins: 32
• Operating Temperature Range: -40°C To +125°C
• Msl: MSL 1 - Unlimited
• Supply Voltage Min: 4V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

TYPICAL APPLICATIONS
LTC3890
32
100
90
80
70
60
50
40
30
20
10
0.0001
0
V
V
IN
OUT
Efficiency and Power Loss
PULSE-SKIPPING
LOSS
= 12V
= 3.3V
0.001
vs Output Current
CCM LOSS
OUTPUT CURRENT (A)
BURST EFFICIENCY
0.01
CCM EFFICIENCY
PULSE-SKIPPING
EFFICIENCY
0.1
BURST LOSS
MTOP1, MTOP2, MBOT1, MBOT2: RJK0651DPB
L1: COILCRAFT SER1360-472KL
L2: COILCRAFT SER1360-802KL
C
C
D1, D2: DFLS1100
OUT1
OUT2
31.6k
C
R
C
ITH1
ITH2
A1
: SANYO 6TPE470M
: SANYO 10TPE330M
10.5k
1
R
41.2k
R
FREQ
A2
1000pF
3890 TA02b
470pF
C
C
C
Figure 13. High Efficiency Dual 8.5V/3.3V Step-Down Converter
SS2
ITH1A
10
SS1
10000
1000
100
10
1
0.1
0.01μF
0.01μF
100pF
100k
100k
R
R
R
34.8k
R
34.8k
B2
B1
ITH1
ITH2
V
OUT2
C1
1nF
C2
1nF
100
90
80
70
60
50
40
30
20
10
0.0001
0
SENSE1
SENSE1
V
ITH1
TRACK/SS1
I
PHSMD
CLKOUT
PLLIN/MODE
SGND
EXTV
RUN1
RUN2
FREQ
TRACK/SS2
ITH2
V
SENSE2
SENSE2
V
V
LIM
FB1
FB2
IN
OUT
Efficiency vs Load Current
= 12V
CC
0.001
= 8.5V
LTC3890
+
–
–
+
OUTPUT CURRENT (A)
PGOOD1
PGOOD2
BOOST1
BOOST2
0.01
INTV
PGND
SW1
SW2
BG1
TG1
BG2
TG2
V
V
CC
OUT
IN
= 3.3V
0.1
100k
100k
C
B2
D1
D2
0.1μF
C
0.1μF
B1
INTV
1
3890 TA02c
CC
C
4.7μF
INT
10
MBOT1
MTOP1
MTOP2
MBOT2
4.7μH
8μH
L1
L2
R
R
C
470μF
10mΩ
SENSE1
SENSE2
8mΩ
C
220μF
OUT1
3890 TA02a
IN
100
98
96
94
92
90
88
86
84
82
80
0
I
LOAD
Efficiency vs Input Voltage
5
V
9V TO 60V
10
V
3.3V
5A
IN
= 2A
OUT1
V
C
330μF
OUT1
V
8.5V
3A
15
OUT2
OUT2
INPUT VOLTAGE (V)
20
= 3.3V
25
30 35 40 45 50 55 60
V
OUT2
= 8.5V
3890 TA02d
3890fa