LTC3717 查看數據表（PDF） - Linear Technology
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LTC3717
Linear Technology
LTC3717 Datasheet PDF : 20 Pages
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LTC3717
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (VCC, ION) .................36V to – 0.3V
Boosted Topside Driver Supply Voltage
(BOOST) ................................................... 42V to – 0.3V
SW Voltage .................................................. 36V to – 5V
EXTVCC, (BOOST – SW), RUN/SS,
PGOOD Voltages ....................................... 7V to – 0.3V
VREF, VRNG Voltages ...............(INTVCC + 0.3V) to – 0.3V
ITH, VFB Voltages...................................... 2.7V to – 0.3V
TG, BG, INTVCC, EXTVCC Peak Currents .................... 2A
TG, BG, INTVCC, EXTVCC RMS Currents .............. 50mA
Operating Ambient Temperature
Range (Note 4) ................................... – 40°C to 85°C
Junction Temperature (Note 2) ............................ 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/SS 1
PGOOD 2
VRNG 3
ITH 4
SGND 5
ION 6
VFB 7
VREF 8
16 BOOST
15 TG
14 SW
13 PGND
12 BG
11 INTVCC
10 VCC
9 EXTVCC
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 130°C/ W
ORDER PART
NUMBER
LTC3717EGN
GN PART
MARKING
3717
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 TA = 25°C. VCC = 15V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loop
IQ
Input DC Supply Current
Normal
Shutdown Supply Current
VFB
∆VFB(LINEREG)
∆VFB(LOADREG)
gm(EA)
tON
Feedback Voltage Accuracy
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Error Amplifier Transconductance
On-Time
tON(MIN)
tOFF(MIN)
VSENSE(MAX)
Minimum On-Time
Minimum Off-Time
Maximum Current Sense Threshold (Source)
VPGND – VSW
VSENSE(MIN)
Minimum Current Sense Threshold (Sink)
VPGND – VSW
∆VFB(OV)
∆VFB(UV)
VRUN/SS(ON)
VRUN/SS(LE)
VRUN/SS(LT)
IRUN/SS(C)
IRUN/SS(D)
Output Overvoltage Fault Threshold
Output Undervoltage Fault Threshold
RUN Pin Start Threshold
RUN Pin Latchoff Enable Threshold
RUN Pin Latchoff Threshold
Soft-Start Charge Current
Soft-Start Discharge Current
VRUN/SS = 0V
ITH = 1.2V (Note 3), VREF = 2.4V
VCC= 4V to 36V, ITH = 1.2V (Note 3)
ITH = 0.5V to 1.9V (Note 3)
ITH = 1.2V (Note 3)
ION = 30µA
ION = 60µA
ION = 180µA
ION = 30µA
VRNG = 1V, VFB = VREF/2 – 50mV
VRNG = 0V, VFB = VREF/2 – 50mV
VRNG = INTVCC, VFB = VREF/2 – 50mV
VRNG = 1V, VFB = VREF/2 + 50mV
VRNG = 0V, VFB = VREF/2 + 50mV
VRNG = INTVCC, VFB = VREF/2 + 50mV
RUN/SS Pin Rising
RUN/SS Pin Falling
– 0.65
q
0.93
186
95
q 108
q 76
q 148
q – 140
q – 97
q – 200
8
q 0.8
– 0.5
0.8
1000
15
0.002
– 0.05
1.13
233
115
50
300
135
95
185
– 165
– 115
– 235
10
– 25
1.5
4
3.5
– 1.2
1.8
2000
µA
30
µA
0.65
%
%/V
– 0.3
%
1.33
mS
280
ns
135
ns
100
ns
400
ns
162
mV
114
mV
222
mV
– 190
mV
– 133
mV
– 270
mV
12
%
%
2
V
4.5
V
4.2
V
–3
µA
3
µA
sn3717 3717fs
2
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