Datasheet

LT3494/LT3494A
2
3494fb
ELECTRICAL CHARACTERISTICS
PACKAGE/ORDER INFORMATIONABSOLUTE MAXIMUM RATINGS
V
CC
Voltage ...............................................................16V
SW Voltage ...............................................................40V
CAP Voltage ..............................................................40V
V
OUT
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
(Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage 2.3 2.5 V
Maximum Operating Voltage 16 V
Feedback Voltage V
CTRL
= 3V (Note 3)
●
1.205 1.225 1.245 V
FB Resistor
●
179 182 184 kΩ
Quiescent Current Not Switching 65 75 μA
Quiescent Current in Shutdown V
⎯
S
⎯
H
⎯
D
⎯
N
= 0V, V
CC
= 3V 0 1 μA
Minimum Switch Off Time After Start-Up Mode, V
FB
= 1V, V
CTRL
= 3V (Note 4)
During Start-Up Mode, V
FB
= 0.2V, V
CTRL
= 3V (Note 4)
100
450
ns
ns
Maximum Switch Off Time V
FB
= 1.5V
●
15 20 30 μs
Switch Current Limit LT3494A (Note 5)
LT3494 (Note 5)
225
115
350
180
450
250
mA
mA
Switch V
CESAT
LT3494A, I
SW
= 200mA
LT3494, I
SW
= 100mA
180
110
mV
mV
Switch Leakage Current V
SW
= 5V, V
⎯
S
⎯
H
⎯
D
⎯
N
= 0 0.01 1 μA
Schottky Forward Voltage I
DIODE
= 100mA 900 1100 mV
Schottky Reverse Leakage 0.05 1 μA
PMOS Disconnect V
CAP
– V
OUT
I
OUT
= 10mA, V
CAP
= 5V 250 mV
SHDN Input Voltage High 1.5 V
SHDN Input Voltage Low 0.3 V
SHDN Pin Bias Current V
SHDN
= 3V
V
SHDN
= 0V
5
0
10
0.1
μA
μA
TOP VIEW
9
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
5
6
7
8
4
3
2
1SW
GND
V
CC
CTRL
CAP
V
OUT
FB
SHDN
T
JMAX
= 125°C, θ
JA
= 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 specifi ed with wider operating temperature ranges.
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
CC
= 3V, V
SHDN
= V
CC
, unless otherwise noted. (Note 2)