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LT1940 Datasheet(PDF) 3 Page - Linear Technology

Part # LT1940
Description  Dual Monolithic 1.4A, 1.1MHz Step-Down Switching Regulator
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1940 Datasheet(HTML) 3 Page - Linear Technology

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LT1940
3
1940i
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1940E is guaranteed to meet performance specifications
from 0
°C to 70°C. Specifications over the –40°C to 85°C operating
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VBOOST = 8V unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Boost Voltage
ISW = 1A
1.8
2.5
V
Boost Pin Current
ISW = 1A
20
30
mA
RUN/SS Current
2.3
µA
RUN/SS Threshold
0.3
0.6
V
PG Threshold Offset
VFB Rising
90
125
160
mV
PG Voltage Output Low
VFB = 1.25V, IPG = 250µA
0.22
0.4
V
PG Pin Leakage
VPG = 2V
0.1
1
µA
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current limit at high duty cycle.
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency, VOUT = 3.3V
Efficiency, VOUT = 5V
Maximum Load Current,
VOUT = 1.8V
Switch VCESAT
B
LOAD CURRENT (A)
0
90
80
70
60
50
0.5
1.0
1940 G01
1.5
VOUT = 1.8V
L = 2.2
µH (SUMIDA CR43-2R2)
VIN = 5V
LOAD CURRENT (A)
0
100
90
80
70
60
50
0.5
1.0
1940 G02
1.5
VOUT = 3.3V
L = 3.3
µH (SUMIDA CR43-3R3)
VIN = 5V
VIN = 18V
VIN = 12V
LOAD CURRENT (A)
0
100
90
80
70
60
0.5
1.0
1940 G03
1.5
VOUT = 5V
L = 4.7
µH (SUMIDA CR43-4R7)
VIN = 8V
VIN = 18V
VIN = 12V
Maximum Load Current,
VOUT = 3.3V
Efficiency, VOUT = 1.8V
SW CURRENT (A)
0
200
300
2.0
1940 G06
100
0
0.5
1.0
1.5
400
INPUT VOLTAGE (V)
0
1.4
1.6
12
14
1940 G04
1.2
1.0
8
4
2
6
10
16
1.8
L = 2.2
µH
L = 1.5
µH
L = 1
µH
INPUT VOLTAGE (V)
0
1.4
1.6
20
1940 G05
1.2
1.0
5
10
15
25
1.8
L = 4.7
µH
L = 3.3
µH
L = 2.2
µH



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