LT1936 Linear Technology, LT1936 Datasheet - Page 5

• Manufacturer Part Number: LT1936
• Description: 1.4A 500kHz Step-Down Switching Regulator
• Manufacturer: Linear Technology

TYPICAL PERFORMANCE CHARACTERISTICS
7.0
6.5
6.0
5.5
5.0
4.5
4.0
Minimum Input Voltage
1
V
T
L = 15μH
A
OUT
= 25°C
= 5V
500mA/DIV
LOAD CURRENT (mA)
20mV/DIV
10
10V/DIV
V
V
2.0
OUT
2.5
1.5
1.0
0.5
SW
0
I
L
–50 –25
Switching Waveforms
V
V
V
I
L = 10μH
C
OUT
IN
OUT
OUT
C
100
= 12V
Voltages
= 1A
= 3.3V
= 22μF
SWITCHING THRESHOLD
0
CURRENT LIMIT CLAMP
TEMPERATURE (°C)
25
1000
1936 G13
1μs/DIV
50
75
100
5.0
4.5
4.0
3.5
3.0
Minimum Input Voltage
1
125
V
T
L = 10μH
1936 G18
1936 G16
A
OUT
= 25°C
150
= 3.3V
LOAD CURRENT (mA)
10
500mA/DIV
20mV/DIV
10V/DIV
100
V
V
–20
–40
–60
OUT
SW
60
40
20
I
0
L
Switching Waveforms,
Discontinuous Mode
Error Amp Output Current
0
V
V
I
L = 10μH
C
OUT
IN
OUT
OUT
T
V
A
C
= 12V
= 25°C
= 0.5V
= 50mA
= 3.3V
= 22μF
1936 G14
1000
FB PIN VOLTAGE (V)
1
1μs/DIV
3.0
2.5
1.5
1.0
0.5
2.0
0
–50
Switch Current Limit
–25
2
0
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1936 G19
1936 G17
TEMPERATURE (°C)
25
50
LT1936
75
100
125
1936 G15
1936fd
5
150