LTC3890EGN-1#PBF Linear Technology, LTC3890EGN-1#PBF Datasheet - Page 5

• 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: -

PULSE-SKIPPING
TYPICAL PERFORMANCE CHARACTERISTICS
100mV/DIV
CONTINUOUS
COUPLED
100
OPERATION
Burst Mode
90
80
70
60
50
40
30
20
10
0.0001
0
2A/DIV
FORCED
V
Efficiency and Power Loss
vs Output Current
FIGURE 13 CIRCUIT
1A/DIV
V
V
OUT
AC-
MODE
MODE
IN
OUT
PULSE-SKIPPING
LOSS
I
L
= 12V
Load Step
Burst Mode Operation
V
V
FIGURE 13 CIRCUIT
= 3.3V
0.001
IN
OUT
V
V
I
Inductor Current at Light Load
LOAD
= 12V
IN
OUT
CCM LOSS
= 3.3V
OUTPUT CURRENT (A)
= 12V
= 3.3V
= 200μA
BURST EFFICIENCY
0.01
CCM EFFICIENCY
PULSE-SKIPPING
EFFICIENCY
50μs/DIV
0.1
5μs/DIV
BURST LOSS
1
3890 G01
10
3890 G04
10000
1000
100
10
1
0.1
3890 G07
100mV/DIV
COUPLED
2A/DIV
V
100
OUT
AC-
90
80
70
60
50
40
30
20
10
0.0001
I
0
L
Load Step
Pulse-Skipping Mode
Soft Start-Up
Efficiency vs Output Current
FIGURE 13 CIRCUIT
V
V
FIGURE 13 CIRCUIT
FIGURE 13 CIRCUIT
Burst Mode OPERATION
V
V
IN
OUT
IN
OUT
= 12V
= 12V
= 3.3V
0.001
= 8.5V
OUTPUT CURRENT (A)
2V/DIV
V
OUT2
0.01
50μs/DIV
2ms/DIV
V
OUT
= 3.3V
0.1
2V/DIV
V
OUT1
1
3890 G02
3890 G05
3890 G08
10
100mV/DIV
COUPLED
2A/DIV
V
100
OUT
AC-
98
96
94
92
90
88
86
84
82
80
I
L
0
Efficiency vs Input Voltage
FIGURE 13 CIRCUIT
Load Step
Forced Continuous Mode
V
V
FIGURE 13 CIRCUIT
Tracking Start-Up
FIGURE 13 CIRCUIT
I
IN
OUT
LOAD
5
= 12V
= 3.3V
10
= 2A
V
OUT1
15
INPUT VOLTAGE (V)
2V/DIV
V
20
= 3.3V
OUT2
25
50μs/DIV
2ms/DIV
LTC3890
30 35 40 45 50 55 60
V
OUT2
2V/DIV
V
OUT1
= 8.5V
3890fa
5
3890 G03
3890 G06
3890 G09