Datasheet

LT1618
3
sn1618 1618fas
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50
FEEDBACK VOLTAGE (V)
125
1618 G02
0
75
1.270
1.265
1.260
1.255
1.250
4
2
0
–2
–4
–25 25 50
100
VOLTAGE
CURRENT
FB PIN BIAS CURRENT (nA)
TEMPERATURE (°C)
–50
PEAK CURRENT (A)
125
1618 G03
0
75
2.5
2.0
1.5
1.0
0.5
0
–25 25 50
100
TEMPERATURE (°C)
–50
CURRENT SENSE VOLTAGE (mV)
125
1618 G04
0
75
52
51
50
49
48
–25 25 50
100
I
ADJ
PIN VOLTAGE (V)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
CURRENT SENSE VOLTAGE (mV)
1618 G05
60
50
40
30
20
10
0
TEMPERATURE (°C)
–50
QUIESCENT CURRENT (mA)
125
1618 G06
0
75
2.5
2.0
1.5
1.0
0.5
0
–25 25 50
100
V
IN
= 18V
V
IN
= 1.6V
FB Pin Voltage and Bias Current
Switch Current Limit
Current Sense Voltage
(I
ADJ
Pin = 0V)
Current Sense Voltage
(V
ISP, ISN
)
Quiescent Current
Switch Saturation Voltage
(V
CE, SAT
)
SWITCH CURRENT (A)
0
SATURATION VOLTAGE (mV)
2.0
1618 G01
0.5
1.0
1.5
500
400
300
200
100
0
T
J
= 125°C
T
J
= –50°C
T
J
= 25°C
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1618 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization, and correlation
with statistical process controls.
Note 3: Bias currents flow into the ISP and ISN pins.
Note 4: Switch current limit and switch V
CESAT
for the DD package is
guaranteed by design and/or correlation to static test.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 1.6V, V
SHDN
= 1.6V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch V
CESAT
I
SW
= 1A (Note 4) 200 260 mV
Switch Leakage Current Switch Off, V
SW
= 5V 0.01 5 µA
SHDN Pin Current V
SHDN
= 1.6V 5 20 µA
Shutdown Threshold (SHDN Pin) 0.3 V
Start-Up Threshold (SHDN Pin) 1V