lt3689-5 Linear Technology Corporation, lt3689-5 Datasheet - Page 6

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

LT3689/LT3689-5
TYPICAL PERFORMANCE CHARACTERISTICS
6
140
120
100
25
15
80
60
40
20
10
20
50
40
30
20
10
0
5
0
0
–50
0
BST Pin Current
Switching Frequency vs R
0
Minimum Switch On-Time
I
LOAD
–25
0.4
200
= 700mA
SWITCH CURRENT (mA)
0
TEMPERATURE (°C)
T
0.8
FREQUENCY (MHz)
A
400
25
= –50°C
1.2
50
600
75
1.6
T
A
= 125°C
100
T
800
T
T
A
A
2
= 25°C
= 25°C
125
3689 G13
3689 G16
3689 G19
1000
150
2.4
0.810
0.795
0.790
0.805
0.800
900
850
800
750
700
650
600
550
500
40
39
38
37
36
–50 –25
–50
–50 –25
Feedback Voltage
Overvoltage Lockout
Switching Frequency
R
T
–25
= 20.5k
0
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
25
25
25
50
50
50
75
75
75
100
100
100
125 150
125 150
125
3689 G17
3689 G14
3689 G20
150
1200
1000
5.05
5.04
5.03
5.02
5.01
5.00
4.99
4.98
4.95
4.97
4.96
800
600
400
200
3.6
3.2
3.1
3.5
3.4
3.3
0
–50 –25
–50 –25
0
Output Voltage
Frequency Foldback
V
T
R
IN
A
T
100
= 25°C
= 12.7k
Fixed Undervoltage Lockout
200 300
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
FB VOLTAGE (mV)
25
25
V
V
IN
IN
400
FALLING
RISING
50
50
500
75
75
600
100
100
700
125 150
125 150
800
3689 G15
3689 G18
3689 G21
3689fa
900