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LT1959 Datasheet(PDF) 4 Page - Linear Technology

Part No. LT1959
Description  4.5A, 500kHz Step-Down Switching Regulator
Download  24 Pages
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1959 Datasheet(HTML) 4 Page - Linear Technology

 
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4
LT1959
TYPICAL PERFORMANCE CHARACTERISTICS
Feedback Pin Voltage
Switch Peak Current Limit
Lockout and Shutdown
Thresholds
Shutdown Pin Bias Current
Shutdown Supply Current
Shutdown Supply Current
Error Amplifier Transconductance
Error Amplifier Transconductance
Minimum Input Voltage
with 3.3V Output
LOAD CURRENT (mA)
1
4.1
4.3
4.5
4.7
10
100
1000
1959 G01
3.9
3.7
3.5
3.3
DUTY CYCLE (%)
0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
80
1959 G02
20
40
60
100
TYPICAL
MINIMUM
TEMPERATURE (
°C)
–50
1.215
1.210
1.205
100
1959 G03
–25
0
25
50
75
125
TEMPERATURE (
°C)
–50
–500
– 400
– 300
– 200
–8
–4
0
25
75
1959 G04
–25
0
50
100
125
AT 0.37V SHUTDOWN THRESHOLD.
AFTER SHUTDOWN, CURRENT
DROPS TO A FEW
µA
AT 2.38V LOCKOUT THRESHOLD
JUNCTION TEMPERATURE (
°C)
–50
2.40
2.36
2.32
0.8
0.4
0
25
75
1959 G05
–25
0
50
100
125
LOCKOUT
START-UP
SHUTDOWN
INPUT VOLTAGE (V)
0
25
20
15
10
5
0
510
15
1959 G06
VSHDN = 0V
FREQUENCY (Hz)
3000
2500
2000
1500
1000
500
200
150
100
50
0
–50
100
10k
100k
10M
1959 G09
1k
1M
GAIN
PHASE
ERROR AMPLIFIER EQUIVALENT CIRCUIT
ROUT
200k
COUT
12pF
VC
RLOAD = 50Ω
VFB 2 × 10
–3
)
(
JUNCTION TEMPERATURE (
°C)
–50
2500
2000
1500
1000
500
0
0
50
75
1959 G08
–25
25
100
125
SHUTDOWN VOLTAGE (V)
0
70
60
50
40
30
20
10
0
0.1
0.2
0.3
0.4
1959 G07
VIN = 10V


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