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LT1936EMS8E Datasheet(PDF) 3 Page - Linear Technology

Part # LT1936EMS8E
Description  1.4A, 500kHz Step-Down Switching Regulator
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1936EMS8E Datasheet(HTML) 3 Page - Linear Technology

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LT1936
3
1936fd
LOAD CURRENT (A)
0
60
70
80
90
100
0.5
1.0
1936 G02
1.5
VOUT = 3.3V
TA = 25°C
D1 = DFLS140L
L1 = 10μH, TOKO D63CB
VIN = 5V
VIN = 12V
VIN = 24V
LOAD CURRENT (A)
0
60
70
80
90
100
0.5
1.0
1936 G01
1.5
VOUT = 5V
TA = 25°C
D1 = DFLS140L
L1 = 15μH, TOKO D63CB
VIN = 12V
VIN = 24V
DUTY CYCLE (%)
0
0
0.5
1.0
1.5
2.0
2.5
3.0
20
40
TYP
MIN
60
80
1936 G03
100
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 LT1936E 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
The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBOOST = 17V, unless otherwise noted. (Note 2)
VC Clamp
1.8
V
VC Switch Threshold
0.7
V
Internal Compensation R
50
Internal Compensation C
VCOMP = 1V
150
pF
COMP Pin Leakage
VCOMP = 1.8V, E and I Grades
H Grade
1
2
μA
μA
Switching Frequency
VFB = 1.1V
VFB = 0V
400
500
40
600
kHz
kHz
Maximum Duty Cycle
87
92
%
Switch Current Limit
(Note 3)
1.9
2.2
2.6
A
Switch VCESAT
ISW = 1.2A
410
520
mV
Switch Leakage Current
2μA
Minimum BOOST Voltage Above SW
ISW = 1.2A
2
2.2
V
BOOST Pin Current
ISW = 1.2A
28
50
mA
BOOST Pin Leakage
VSW = 0V
0.1
1
μA
SHDN Input Voltage High
2.3
V
SHDN Input Voltage Low
0.3
V
SHDN Pin Current
VSHDN = 2.3V (Note 5)
VSHDN = 12V (Note 5)
VSHDN = 0V
34
140
0.01
50
240
0.1
μA
μA
μA
with statistical process controls. The LT1936I specifications are
guaranteed over the –40°C to 125°C temperature range. The LT1936H
specifications 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 flows out of pin.
Note 5: Current flows into pin.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency, VOUT = 5V
Efficiency, VOUT = 3.3V
Switch Current Limit


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