LTC1700_ 查看數據表（PDF） - Linear Technology
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LTC1700_ Datasheet PDF : 32 Pages
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LTC1871-7
ABSOLUTE AXI U RATI GS
(Note 1)
VIN Voltage ............................................... – 0.3V to 36V
INTVCC Voltage ........................................... – 0.3V to 9V
INTVCC Output Current ........................................ 50mA
GATE Voltage ........................... – 0.3V to VINTVCC + 0.3V
ITH, FB Voltages ....................................... – 0.3V to 2.7V
RUN Voltage ............................................... – 0.3V to 7V
MODE/SYNC Voltage ...................................– 0.3V to 9V
FREQ Voltage ............................................– 0.3V to 1.5V
SENSE Pin Voltage ................................... – 0.3V to 36V
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Junction Temperature (Note 3) ............................ 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RUN 1
10 SENSE
ITH 2
FB 3
FREQ 4
9 VIN
8 INTVCC
7 GATE
MODE/ 5
6 GND
SYNC
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 120°C/ W
ORDER PART
NUMBER
LTC1871EMS-7
MS PART MARKING
LTG4
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VIN = 8V, VRUN = 1.5V, RFREQ = 80k, VMODE/SYNC = 0V, unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loop
VIN(MIN)
IQ
VRUN+
VRUN–
Minimum Input Voltage
Input Voltage Supply Current
Continuous Mode
Burst Mode Operation, No Load
Shutdown Mode
Rising RUN Input Threshold Voltage
Falling RUN Input Threshold Voltage
6
V
(Note 4)
VMODE/SYNC = 5V, VFB = 1.4V, VITH = 0.75V
VMODE/SYNC = 0V, VITH = 0.2V (Note 5)
VRUN = 0V
600 1000
µA
280 500
µA
12
25
µA
1.348
V
1.223 1.248 1.273
V
q 1.198
1.298
V
VRUN(HYST)
IRUN
VFB
RUN Pin Input Threshold Hysteresis
RUN Input Current
Feedback Voltage
VITH = 0.2V (Note 5)
50
100 150
mV
5
60
nA
1.218 1.230 1.242
V
q 1.212
1.248
V
IFB
FB Pin Input Current
VITH = 0.2V (Note 5)
∆VFB
Line Regulation
∆VIN
6V ≤ VIN ≤ 30V
∆VFB
∆VITH
Load Regulation
VMODE/SYNC = 0V, VITH = 0.5V to 0.90V (Note 5) q – 1
∆VFB(OV) ∆FB Pin, Overvoltage Lockout
VFB(OV) – VFB(NOM) in Percent
2.5
gm
Error Amplifier Transconductance
ITH Pin Load = ±5µA (Note 5)
VITH(BURST) Burst Mode Operation ITH Pin Voltage
Falling ITH Voltage (Note 5)
VSENSE(MAX) Maximum Current Sense Input Threshold Duty Cycle < 20%
120
ISENSE(ON) SENSE Pin Current (GATE High)
VSENSE = 0V
ISENSE(OFF) SENSE Pin Current (GATE Low)
VSENSE = 30V (No RSENSE Mode)
18
60
0.002 0.02
– 0.1
6
10
600
0.3
150 180
35
70
0.1
5
nA
%/V
%
%
µmho
V
mV
µA
µA
18717f
2
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