LT1576/LT1576-5
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Drop
Switch Peak Current Limit
Feedback Pin Voltage
0.5
0.4
0.3
0.2
0.1
0
1.23
1.22
1.21
1.20
1.19
2.5
2.0
1.5
1.0
0.5
0
TYPICAL
125°C
25°C
MINIMUM
–20°C
0
20
40
60
80
100
0
0.50 0.75 1.00
1.25 1.50
0.25
–25
0
25
50
75
125
–50
100
SWITCH CURRENT (A)
DUTY CYCLE (%)
JUNCTION TEMPERATURE (°C)
1576 G02
1576 G01
1576 G03
Shutdown Pin Bias Current
Shutdown Pin Bias Current
Shutdown Thresholds
4
3
2
1
0
180
160
140
120
100
80
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
AT 2.44V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
START-UP
SHUTDOWN
60
CURRENT REQUIRED TO FORCE
40
SHUTDOWN (FLOWS OUT OF PIN).
AFTER SHUTDOWN, CURRENT
DROPS TO A FEW µA
20
0
–25
0
25
50
75
125
–25
0
25
50
75
125
–25
0
25
50
75
125
–50
100
–50
100
–50
100
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
1576 G04
1576 G05
1576 G06
Shutdown Supply Current
Standby Thresholds
Error Amplifier Transconductance
2000
1500
1000
500
200
150
100
50
25
20
15
10
5
2.46
2.45
2.44
2.43
2.42
2.41
2.40
V
= 0V
SHDN
PHASE
GAIN
ON
V
C
STANDBY
C
OUT
2.4pF
R
OUT
570k
V
1 × 10–3
(
)
FB
0
ERROR AMPLIFIER EQUIVALENT CIRCUIT
= 50Ω
0
R
LOAD
–500
0
–50
0
5
10
15
20
25
10
100
1k
10k
100k
1M
50
100 125
–50 –25
0
25
75
INPUT VOLTAGE (V)
FREQUENCY (Hz)
JUNCTION TEMPERATURE (°C)
1576 G09
1576 G08
1576 G07
4
Linear [ Linear ]
