Datasheet

LT3495/LT3495B/
LT3495-1/LT3495B-1
3
3495b1b1fa
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3495/LT3495B/LT3495-1/LT3495B-1 are guaranteed to
meet performance specifications from 0°C to 125°C junction temperature.
Specifications over the –40°C to 125°C operating junction temperature
range are assured by design, characterization and correlation with
statistical process controls.
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3V, V
SHDN
= V
CC
, unless otherwise noted. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch Current Limit LT3495-1/LT3495B-1
l
275 350 450 mA
Switch V
CESAT
LT3495/LT3495B, I
SW
= 400mA
LT3495-1/LT3495B-1, I
SW
= 200mA
200
125
mV
mV
Switch Leakage Current V
SW
= 5V 0.01 1 µA
PMOS Disconnect Current Limit After Start-Up
During Start-Up
250
110
370
150
450
190
mA
mA
PMOS Disconnect V
CAP
– V
OUT
I
OUT
= 50mA, V
CAP
= 15V 150 mV
V
CAP
– V
OUT
Clamp Voltage 8.7 V
SHDN Input Voltage High 1.5 V
SHDN Input Voltage Low 0.3 V
SHDN Pin Bias Current V
SHDN
= 3V
V
SHDN
= 0V
5.3
0
8 µA
µA
CTRL Pin Bias Current V
CTRL
= 0.5V, Current Flows Out of Pin
l
20 100 nA
CTRL to FB Offset V
CTRL
= 0.5V 6 14 mV
Maximum Shunt Current LT3495/LT3495-1, V
FB
= 1.5V 230 µA
Note 3: Internal reference voltage is determined by finding V
FB
voltage
level which causes quiescent current to increase 150µA above “Not
Switching” level.
Note 4: If CTRL is overriding the internal reference, Start-Up mode occurs
when V
FB
is less then half the voltage on CTRL. If CTRL is not overriding
the internal reference, Start-Up mode occurs when V
FB
is less then half the
voltage of the internal reference.
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise noted.
Switching Frequency
vs Load Current Load Regulation V
OUT
vs CTRL Voltage
LOAD CURRENT (mA)
0
SWITCHING FREQUENCY (kHz)
1000
800
400
200
600
0
8040
3495 G01
1206020 100
V
CC
= 3.6V
V
OUT
= 16V
FIGURE 7 CIRCUIT
LOAD CURRENT (mA)
0
V
OUT
VOLTAGE CHANGE (%)
1.5
1.0
0.0
–0.5
–1.0
0.5
–1.5
8040
3495 G02
1206020 100
V
CC
= 3.6V
V
OUT
= 16V
FIGURE 7 CIRCUIT
CTRL VOLTAGE (V)
0
V
OUT
VOLTAGE (V)
18
15
9
6
3
12
0
1.20.6
3495 G03
1.50.90.3
FIGURE 7 CIRCUIT