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LT1372 Datasheet(PDF) 3 Page - Linear Technology

Part No. LT1372
Description  500kHz and 1MHz High Efficiency 1.5A Switching Regulators
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LT1372 Datasheet(HTML) 3 Page - Linear Technology

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3
LT1372/LT1377
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Maximum Switch Duty Cycle
q
90
95
%
Switch Current Limit Blanking Time
130
260
ns
BV
Output Switch Breakdown Voltage
LT1372/LT1377
q
35
47
V
LT1372HV
0
°C ≤ TJ ≤ 125°C
q
42
47
V
– 40
°C ≤ TJ < 0°C (I Grade)
40
V
VSAT
Output Switch “On” Resistance
ISW = 1A
q
0.5
0.8
ILIM
Switch Current Limit
Duty Cycle = 50%
q
1.5
1.9
2.7
A
Duty Cycle = 80% (Note 1)
q
1.3
1.7
2.5
A
∆IIN
Supply Current Increase During Switch On-Time
15
25
mA/A
∆ISW
Control Voltage to Switch Current
2A/V
Transconductance
Minimum Input Voltage
q
2.4
2.7
V
IQ
Supply Current
2.7V
≤ VIN ≤ 25V
q
4
5.5
mA
Shutdown Supply Current
2.7V
≤ VIN ≤ 25V, VS/S ≤ 0.6V
0
°C ≤ TJ ≤ 125°C
q
12
30
µA
– 40
°C ≤ TJ < 0°C (I Grade)
50
µA
Shutdown Threshold
2.7V
≤ VIN ≤ 25V
q
0.6
1.3
2
V
Shutdown Delay
q
512
25
µs
S/S Pin Input Current
0V
≤ VS/S ≤ 5V
q
–10
15
µA
Synchronization Frequency Range
LT1372
q
600
800
kHz
LT1377
q
1.2
1.6
MHz
ELECTRICAL C
C
HARA TERISTICS
VIN = 5V, VC = 0.6V, VFB = VREF, VSW, S/S and NFB pins open, unless otherwise noted.
Switch Saturation Voltage
vs Switch Current
TEMPERATURE (
°C)
–50
1.8
2.0
2.2
2.4
2.6
050
100
150
LT1372 • G03
2.8
3.0
–25
25
75
125
Minimum Input Voltage
vs Temperature
DUTY CYCLE (%)
0
1.0
2.0
3.0
0.5
1.5
2.5
20
40
60
80
LT1372 • G02
100
10
0
30
50
70
90
25
°C AND
125
°C
–55
°C
Switch Current Limit
vs Duty Cycle
TYPICAL PERFORMANCE CHARACTERISTICS
SWITCH CURRENT (A)
0
0.6
0.8
1.0
1.6
LT1372 • G01
0.4
0.2
0.5
0.7
0.9
0.3
0.1
0
0.4
0.8
1.2
2.0
1.4
0.2
0.6
1.0
1.8
100
°C
150
°C
25
°C
–55
°C
The q denotes specifications which apply over the full operating
temperature range.
Note 1: For duty cycles (DC) between 50% and 90%, minimum
guaranteed switch current is given by ILIM = 0.667 (2.75 – DC).


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