LTC1708EG-PG_1 查看數據表（PDF） - Linear Technology
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LTC1708EG-PG_1
Linear Technology
LTC1708EG-PG_1 Datasheet PDF : 32 Pages
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LTC1708-PG
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VID Parameters
VIDVCC
IVIDVCC
RFBOUT1/SENSE1
RRATIO
RPULL-UP
VIDT
IVIDLEAK
VPULL-UP
VID Operating Supply Voltage
VID Supply Current
Resistance Between ATTNIN/ATTNOUT
Resistor Ratio Accuracy
VID0 to VID4 Pull-Up Resistance
VID Voltage Threshold
VID Input Leakage Current
VID Pull-Up Voltage
VIDVCC = 3.3V (Note 8)
Programmed from 0.925V to 2.00V
(Note 9) VDIODE = 0.7V
(Note 9) VIDVCC < VIDVCC < 7V
VIDVCC = 3V
2.7
5.5
V
0.01
5
µA
10
5
kΩ
0.25
%
40
kΩ
0.4
1.0
1.6
V
0.1
1
µA
2.5
2.8
3.1
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1708EG-PG is guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the – 40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1708EG-PG: TJ = TA + (PD • 85°C/W)
Note 4: The LTC1708-PG is tested in a feedback loop that servos VITH1, 2
to a specified voltage and measures the resultant EAIN1, 2.
Note 5: The supply current is higher due to the gate charge being delivered
at the switching frequency. See Applications Information.
Note 6: The minimum on-time condition corresponds to the on inductor
peak-to-peak ripple current ≥ 40% of IMAX (see minimum on-time
considerations in the Applications Information section).
Note 7: VFREQSET pin internally tied to 1.19V reference through a large
resistance.
Note 8: With all five VID inputs floating (or tied to VIDVCC) the VIDVCC
current is typically < 1µA. However, the VIDVCC current will rise and be
approximately equal to the number of grounded VID input pins times
(VIDVCC – 0.6V)/40k. (See the Applications Information section.)
Note 9: Each built-in pull-up resistor attached to the VID inputs also has a
series diode to allow input voltages higher than the VIDVCC supply without
damage or clamping. (See Applications Information section.)
Note 10: Rise and fall times are measured at 20% to 80% levels. Delay
and nonoverlap times are measured using 50% levels.
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Output Current
and Mode (Figure 12)
100
90 Burst Mode
80 OPERATION
15A
70
60
50
CONSTANT FREQUENCY
40
MODE
30
PWM MODE
20
10
0
0.1
VIN = 15V
VOUT = 1.6V
1
10
100
OUTPUT CURRENT (A)
1708 G01
Efficiency vs Output Current
(Figure 12)
100
EXTVCC = 0V
90
VIN = 5V
80
15A
70
VIN = 10V
60
VIN = 15V
50
VIN = 20V
40
30
20
10
0
0.01
VFCB = OPEN
VOUT = 1.6V
0.1
1
10
100
OUTPUT CURRENT (A)
1708 G02
Efficiency vs Input Voltage
(Figure 12)
100
VOUT = 1.6V
EXTVCC = 0V
90
IOUT = 7A
80
IOUT = 12A
70
60
50
5
10
15
20
25 28
INPUT VOLTAGE (V)
1708 G03
4
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