Datasheet

LT1933
3
1933fe
ELECTRICAL CHARACTERISTICS
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 LT1933E is guaranteed to meet performance specifi cations
from 0°C to 70°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 LT1933I specifi cations are
PARAMETER CONDITIONS MIN TYP MAX UNITS
Undervoltage Lockout 3.35 3.6 V
Feedback Voltage
l
1.225 1.245 1.265 V
FB Pin Bias Current V
FB
= Measured V
REF
+ 10mV (Note 4)
l
40 120 nA
Quiescent Current Not Switching 1.6 2.5 mA
Quiescent Current in Shutdown V
SHDN
= 0V 0.01 2 µA
Reference Line Regulation V
IN
= 5V to 36V 0.01 %/V
Switching Frequency V
FB
= 1.1V 400 500 600 kHz
V
FB
= 0V 55 kHz
Maximum Duty Cycle
l
88 94 %
Switch Current Limit (Note 3) 0.75 1.05 A
Switch V
CESAT
I
SW
= 400mA, S6 Package
I
SW
= 400mA, DCB6 Package
370
370
500 mV
mV
Switch Leakage Current 2µA
Minimum Boost Voltage Above Switch I
SW
= 400mA 1.9 2.3 V
BOOST Pin Current I
SW
= 400mA 18 25 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
34
0.01
50
0.1
µA
µA
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)
guaranteed over the –40°C to 125°C temperature range. The LT1933H
specifi cations are guaranteed over the –40°C to 150°C temperature range.
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.
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