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LT1676 Datasheet(PDF) 4 Page - Linear Technology

Part # LT1676
Description  Step-Down Switching Regulator
PDF  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1676 Datasheet(HTML) 4 Page - Linear Technology

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4
LT1766/LT1766-5
1766fa
Switch Peak Current Limit
SHDN Pin Bias Current
Shutdown Supply Current
Lockout and Shutdown
Thresholds
Shutdown Supply Current
Error Amplifier Transconductance
FB Pin Voltage and Current
Error Amplifier Transconductance
Frequency Foldback
TYPICAL PERFOR A CE CHARACTERISTICS
DUTY CYCLE (%)
1.0
1.5
2.0
2.5
20
40
TYPICAL
60
80
1766 G01
100
0
GUARANTEED MINIMUM
TA = 25°C
JUNCTION TEMPERATURE (
°C)
–50
1.224
1.229
1.234
25
75
1766 G02
1.219
1.214
–25
0
50
100
125
1.209
1.204
1.5
2.0
1.0
0.5
0
VOLTAGE
CURRENT
JUNCTION TEMPERATURE (
°C)
–50
250
200
150
100
12
6
0
25
75
1766 G03
–25
0
50
100
125
CURRENT REQUIRED TO FORCE SHUTDOWN
(FLOWS OUT OF PIN). AFTER SHUTDOWN,
CURRENT DROPS TO A FEW
µA
AT 2.38V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
JUNCTION TEMPERATURE (
°C)
–50
50
100
1766 G04
0
25
75
2.4
2.0
1.6
1.2
0.8
0.4
0
–25
125
LOCKOUT
START-UP
SHUTDOWN
INPUT VOLTAGE (V)
0
1766 G05
10
20
30
40
50
60
40
35
30
25
20
15
10
5
0
VSHDN = 0V
TA = 25°C
SHUTDOWN VOLTAGE (V)
0
0
50
100
150
200
250
300
0.1
0.2
0.3
0.4
1766 G06
0.5
VIN = 60V
VIN = 15V
TA = 25°C
JUNCTION TEMPERATURE (
°C)
1766 G07
2500
2000
1500
1000
500
0
–50
50
100
0
25
75
–25
125
FREQUENCY (Hz)
3000
2500
2000
1500
1000
500
200
150
100
50
0
–50
100
10k
100k
10M
1766 G08
1k
1M
GAIN
PHASE
ERROR AMPLIFIER EQUIVALENT CIRCUIT
ROUT
200k
COUT
12pF
VC
RLOAD = 50Ω
VFB 2 • 10
–3
)
(
TA = 25°C
VFB (V)
0
300
400
600
500
1766 G09
200
100
0
0.5
1.0
1.5
SWITCHING
FREQUENCY
FB PIN
CURRENT
TA = 25°C



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