Datasheet

4
LT1576/LT1576-5
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
JUNCTION TEMPERATURE (°C)
–50
4
3
2
1
0
100
1576 G04
25 0 25 50 75 125
CURRENT (µA)
AT 2.44V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
Shutdown Pin Bias Current
JUNCTION TEMPERATURE (°C)
–50
180
160
140
120
100
80
60
40
20
0
100
1576 G05
25 0 25 50 75 125
CURRENT (µA)
CURRENT REQUIRED TO FORCE
SHUTDOWN (FLOWS OUT OF PIN).
AFTER SHUTDOWN, CURRENT
DROPS TO A FEW µA
Shutdown Pin Bias Current
JUNCTION TEMPERATURE (°C)
–50
SHUTDOWN PIN VOLTAGE (V)
100
1576 G06
050
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–25 25 75 125
START-UP
SHUTDOWN
Shutdown Supply Current
INPUT VOLTAGE (V)
0
INPUT SUPPLY CURRENT (µA)
25
20
15
10
5
0
20
1576 G08
5
10
15
25
V
SHDN
= 0V
FREQUENCY (Hz)
GAIN (µMho)
PHASE (DEG)
2000
1500
1000
500
0
500
200
150
100
50
0
–50
10 1k 10k 1M
1576 G09
100 100k
GAIN
PHASE
ERROR AMPLIFIER EQUIVALENT CIRCUIT
R
OUT
570k
C
OUT
2.4pF
V
C
R
LOAD
= 50
V
FB
1 × 10
–3
)(
Error Amplifier Transconductance
JUNCTION TEMPERATURE (°C)
–50
SHUTDOWN PIN VOLTAGE (V)
2.46
2.45
2.44
2.43
2.42
2.41
2.40
25 75
1576 G07
–25 0
50 100 125
ON
STANDBY
Shutdown Thresholds
Standby Thresholds
Switch Drop
JUNCTION TEMPERATURE (°C)
–50
1.23
1.22
1.21
1.20
1.19
100
1576 G03
25 0 25 50 75 125
FEEDBACK VOLTAGE (V)
SWITCH CURRENT (A)
0
SWITCH VOLTAGE (V)
0.5
0.4
0.3
0.2
0.1
0
0.25
0.50 0.75 1.00
1576 G01
1.25 1.50
125°C
–20°C
25°C
Feedback Pin VoltageSwitch Peak Current Limit
DUTY CYCLE (%)
0
SWITCH PEAK CURRENT (A)
2.5
2.0
1.5
1.0
0.5
0
80
1576 G02
20
40
60
100
TYPICAL
MINIMUM