 English |
|
|
|
|
|
|
|
| LTC3608 Datasheet, PDF (4/24 Pages) Linear Technology – 18V, 8A Monolithic Synchronous Step-Down DC/DC Converter | |||
| |||
| ◁ |
LTC3608
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 speciï¬ed error ampliï¬er output voltage (ITH). The speciï¬cation at
85°C is not tested in production. This speciï¬cation is assured by design,
characterization, and correlation to testing at 125°C.
Note 4: The LTC3608E is guaranteed to meet performance speciï¬cations
from 0°C to 125°C. Speciï¬cations over the â40°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 â40°C to 125°C operating junction temperature range.
TYPICAL PERFORMANCE CHARACTERISTICS
Transient Response
Transient Response
Start-Up
VOUT
200mV/DIV
IL
5A/DIV
ILOAD
5A/DIV
20μs/DIV
LOAD STEP 0A TO 8A
VIN = 12V
VOUT = 2.5V
FCB = 0V
FIGURE 6 CIRCUIT
VOUT
200mV/DIV
3608 G01
IL
5A/DIV
ILOAD
5A/DIV
20μs/DIV
VIN = 12V
VOUT = 2.5V
FCB = INTVCC
FIGURE 6 CIRCUIT
RUN/SS
2V/DIV
3610 G02
VOUT
1V/DIV
IL
5A/DIV
40ms/DIV
VIN = 12V
VOUT = 2.5V
RLOAD = 0.5Ω
FIGURE 6 CIRCUIT
3608 G03
Efï¬ciency vs Load Current
100
90
80
70
60
50
40
30
20
10 VIN = 12V
FREQ = 550kHz
0
0.01
0.1
VOUT = 5V
VOUT = 3.3V
VOUT = 2.5V
VOUT = 2.5V
VOUT = 1.8V
VOUT = 1.2V
VOUT = 1V
1
10
LOAD CURRENT (A)
3608 G04
Efï¬ciency vs Input Voltage
100
FCB = 5V
FIGURE 6 CIRCUIT
95
ILOAD = 10A
90
ILOAD = 1A
85
80
5
10
15
INPUT VOLTAGE (V)
20
3608 G05
Frequency vs Input Voltage
650
FCB = 0V
FIGURE 6 CIRCUIT
600
ILOAD = 10A
550
500
ILOAD = 1A
450
400
5
10
15
INPUT VOLTAGE (V)
20
3608 G06
3608fa
4
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese