LT3494 Просмотр технического описания (PDF) - Linear Technology
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LT3494 Datasheet PDF : 12 Pages
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LT3494/LT3494A
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VCC Voltage ...............................................................16V
SW Voltage ...............................................................40V
CAP Voltage ..............................................................40V
VOUT Voltage .............................................................40V
SHDN Voltage ...........................................................16V
CTRL Voltage ............................................................16V
FB Voltage................................................................2.5V
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range (Note 2) ... –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
PACKAGE/ORDER INFORMATION
TOP VIEW
SW 1
8 CAP
GND 2
9
7 VOUT
VCC 3
6 FB
CTRL 4
5 SHDN
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 76°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER DDB PART MARKING
LT3494EDDB
LT3494AEDDB
LCCD
LCRW
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 3V, VSHDN = VCC, unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Operating Voltage
2.3
2.5
V
Maximum Operating Voltage
16
V
Feedback Voltage
FB Resistor
VCTRL = 3V (Note 3)
● 1.205 1.225 1.245
V
● 179
182
184
kΩ
Quiescent Current
Not Switching
65
75
μA
Quiescent Current in Shutdown
Minimum Switch Off Time
Maximum Switch Off Time
Switch Current Limit
V⎯S⎯H⎯D⎯N = 0V, VCC = 3V
0
1
μA
After Start-Up Mode, VFB = 1V, VCTRL = 3V (Note 4)
During Start-Up Mode, VFB = 0.2V, VCTRL = 3V (Note 4)
100
ns
450
ns
VFB = 1.5V
● 15
20
30
μs
LT3494A (Note 5)
LT3494 (Note 5)
225
350
450
mA
115
180
250
mA
Switch VCESAT
Switch Leakage Current
Schottky Forward Voltage
Schottky Reverse Leakage
LT3494A, ISW = 200mA
LT3494, ISW = 100mA
VSW = 5V, V⎯S⎯H⎯D⎯N = 0
IDIODE = 100mA
180
mV
110
mV
0.01
1
μA
900 1100
mV
0.05
1
μA
PMOS Disconnect VCAP – VOUT
SHDN Input Voltage High
IOUT = 10mA, VCAP = 5V
250
mV
1.5
V
SHDN Input Voltage Low
0.3
V
SHDN Pin Bias Current
VSHDN = 3V
VSHDN = 0V
5
10
μA
0
0.1
μA
3494fb
2
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