LT1936 Linear Technology, LT1936 Datasheet - Page 3

• Manufacturer Part Number: LT1936
• Description: 1.4A 500kHz Step-Down Switching Regulator
• Manufacturer: Linear Technology

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