Datasheet

LT3493
3
3493fb
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 LT3493E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3493I specifi cations are
guaranteed over the –40°C to 125°C temperature range.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch Current Limit (Note 3) 1.4 1.75 2.2 A
Switch V
CESAT
I
SW
= 1A 330 mV
Switch Leakage Current 2μA
Minimum Boost Voltage Above Switch I
SW
= 1A 1.85 2.2 V
BOOST Pin Current I
SW
= 1A 30 50 mA
SHDN Input Voltage High 2.3 V
SHDN Input Voltage Low 0.3 V
SHDN Bias Current V
SHDN
= 2.3V (Note 5)
V
SHDN
= 0V
6
0.01
15
0.1
μA
μA
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 12V, V
BOOST
= 17V, unless otherwise noted. (Note 2)
Note 3: Current limit guaranteed by design and/or correlation to static test.
Slope compensation reduces current limit at higher duty cycle.
Note 4: Current fl ows out of pin.
Note 5: Current fl ows into pin.
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise noted.
Effi ciency (V
OUT
= 5V, L = 10μH)
LOAD CURRENT (A)
0
50
EFFICIENCY (%)
55
65
70
75
0.8 1.0
95
3493 G01
60
0.2 0.4 0.6 1.2
80
85
90
V
IN
= 8V
V
IN
= 12V
V
IN
= 24V
LOAD CURRENT (A)
0
50
EFFICIENCY (%)
55
65
70
75
0.8 1.0
3493 G02
60
0.2 0.4 0.6 1.2
80
85
90
V
IN
= 8V
V
IN
= 12V
V
IN
= 24V
LOAD CURRENT (A)
0
50
EFFICIENCY (%)
55
65
70
75
0.8 1.0
3493 G03
60
0.2 0.4 0.6 1.2
80
V
IN
= 5V
V
IN
= 12V
Effi ciency (V
OUT
= 3.3V, L = 10μH) Effi ciency (V
OUT
= 1.8V, L = 4.7μH)