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LTC3608 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC3608
Description  18V, 8A Monolithic Synchronous Step-Down DC/DC Converter
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3608 Datasheet(HTML) 4 Page - Linear Technology

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LTC3608
4
3608fa
Transient Response
Transient Response
Start-Up
VIN = 12V
VOUT = 2.5V
RLOAD = 0.5Ω
FIGURE 6 CIRCUIT
3608 G03
40ms/DIV
RUN/SS
2V/DIV
VOUT
1V/DIV
IL
5A/DIV
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD as follows:
LTC3608: TJ = TA + (PD • 29°C/W)(θJA is simulated per JESD51-7 high
effective thermal conductivity test board)
θJC = 1°C/W (θJC is simulated when heat sink is applied at the bottom
of the package.)
Note 3: The LTC3608 is tested in a feedback loop that adjusts VFB to
achieve a specified error amplifier output voltage (ITH). The specification at
85°C is not tested in production. This specification is assured by design,
characterization, and correlation to testing at 125°C.
Note 4: The LTC3608E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3608I is guaranteed
over the full –40°C to 125°C operating junction temperature range.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current
Efficiency vs Input Voltage
Frequency vs Input Voltage
LOAD CURRENT (A)
0.01
0
10
20
30
40
50
60
70
80
90
100
0.1
1
3608 G04
10
VOUT = 5V
VOUT = 3.3V
VOUT = 2.5V
VOUT = 2.5V
VOUT = 1.8V
VOUT = 1.2V
VOUT = 1V
VIN = 12V
FREQ = 550kHz
INPUT VOLTAGE (V)
5
80
85
90
95
100
10
15
3608 G05
20
ILOAD = 10A
ILOAD = 1A
FCB = 5V
FIGURE 6 CIRCUIT
INPUT VOLTAGE (V)
5
400
450
500
550
600
650
10
15
3608 G06
20
ILOAD = 10A
ILOAD = 1A
FCB = 0V
FIGURE 6 CIRCUIT
LOAD STEP 0A TO 8A
VIN = 12V
VOUT = 2.5V
FCB = 0V
FIGURE 6 CIRCUIT
3608 G01
20μs/DIV
VOUT
200mV/DIV
IL
5A/DIV
ILOAD
5A/DIV
VIN = 12V
VOUT = 2.5V
FCB = INTVCC
FIGURE 6 CIRCUIT
3610 G02
20μs/DIV
VOUT
200mV/DIV
IL
5A/DIV
ILOAD
5A/DIV



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