RT7257D
Current Limit vs. Temperature
Output Current Limit vs. Input Voltage
8
7
6
5
4
3
2
6
5
4
3
2
1
0
VOUT = 1.2V
VOUT = 3.3V Add Bootstrap Diode
VOUT = 3.3V
VIN = 12V, VOUT = 3.3V
VIN = 12V
14.5 17
-50
-25
0
25
50
75
100
125
4.5
7
9.5
12
Temperature (°C)
Input Voltage (V)
Load Transient Response
Load Transient Response
VOUT
VOUT
(100mV/Div)
(100mV/Div)
IOUT
IOUT
(2A/Div)
(2A/Div)
VIN = 12V, VOUT = 3.3V, IOUT = 0.2A to 3A
VIN = 12V, VOUT = 3.3V, IOUT = 1.5A to 3A
Time (100μs/Div)
Time (100μs/Div)
Switching
Switching
VOUT
VOUT
(5mV/Div)
(5mV/Div)
VSW
VSW
(10V/Div)
(10V/Div)
IL
IL
(2A/Div)
(2A/Div)
VIN = 12V, VOUT = 3.3V, IOUT = 1.5A
Time (500ns/Div)
VIN = 12V, VOUT = 3.3V, IOUT = 3A
Time (500ns/Div)
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DS7257D-05 October 2016
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7
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