lt3689-5 Linear Technology Corporation, lt3689-5 Datasheet - Page 7

• Manufacturer Part Number: lt3689-5
• Description: 700ma Step-down Regulator With Power-on Reset And Watchdog Timer
• Manufacturer: Linear Technology Corporation

TYPICAL PERFORMANCE CHARACTERISTICS
5.0
3.5
3.0
4.5
4.0
6
5
4
0
7
3
2
1
–50 –25
0
EN/UVLO Pin Current
EN/UVLO Hysteresis Current
5
10mV/DIV
0
10
0.5A/DIV
10V/DIV
TEMPERATURE (°C)
T
A
V
25
V
T
V
OUT
= 150°C
SW
A
EN/UVLO
15
I
= –50°C
L
Switching Waveform:
Full Frequency Continuous Operation
V
I
50
LOAD
IN
20
= 12V, FRONT PAGE APPLICATION
(V)
75
= 600mA
25
T
100
A
= 25°C
30
125 150
3689 G22
3689 G25
1μs/DIV
35
10mV/DIV
0.2A/DIV
5V/DIV
1.300
1.290
1.280
1.270
1.260
1.250
1.240
1.230
1.220
1.210
1.200
V
V
OUT
SW
I
L
–50
EN/UVLO Pin Threshold
Switching Waveform:
Burst Mode Operation
V
I
LOAD
3689 G28
V
IN
IN
EN/UVLO THRESHOLD RISING
EN/UVLO THRESHOLD FALLING
= 12V, FRONT PAGE APPLICATION
–25
= 12V
= 6mA
0
TEMPERATURE (°C)
25
5μs/DIV
50
75
0.730
0.725
0.720
0.715
0.710
100
–50 –25
125
Power-On-Reset Threshold
vs Temperature
3689 G23
3689 G26
150
0
10mV/DIV
0.2A/DIV
TEMPERATURE (°C)
5V/DIV
25
V
V
900
800
600
700
500
400
300
200
100
OUT
SW
LT3689/LT3689-5
0
I
L
0
50
V
I
Boost Diode Forward Voltage
Switching Waveform:
Transition from Burst Mode
to Full Frequency
LOAD
IN
= 12V, FRONT PAGE APPLICATION
75
= 60mA
10
BOOST DIODE CURRENT (mA)
100
125 150
T
T
20
3689 G29
A
A
1μs/DIV
= –50°C
= 150°C
30
T
A
40
= 25°C
3689 G24
3689 G27
3689fa
7
50