LTC3608(RevC) Просмотр технического описания (PDF) - Linear Technology
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LTC3608 Datasheet PDF : 26 Pages
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LTC3608
Electrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 15V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Internal VCC Regulator
VINTVCC
Internal VCC Voltage
ΔVLDO(LOADREG) Internal VCC Load Regulation
VEXTVCC
EXTVCC Switchover Voltage
ΔVEXTVCC
EXTVCC Switch Drop Voltage
ΔVEXTVCC(HYS)
EXTVCC Switchover Hysteresis
PGOOD Output
6V < VIN < 18V, VEXTVCC = 4V
ICC = 0mA to 20mA, VEXTVCC = 4V
ICC = 20mA, VEXTVCC Rising
ICC = 20mA, VEXTVCC = 5V
l 4.7
5
5.5
V
–0.1
±2
%
l 4.5
4.7
V
150
300
mV
500
mV
ΔVFBH
ΔVFBL
ΔVFB(HYS)
VPGL
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
VFB Rising
VFB Falling
VFB Returning
IPGOOD = 5mA
7
10
13
%
–7
–10
–13
%
1
2.5
%
0.15
0.4
V
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:
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 LTC3608 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3608E is guaranteed to meet specifications from
0°C to 125°C junction temperature. 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. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors.
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
3608fc
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