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LT3689 Datasheet(PDF) 5 Page - Linear Technology

Part # LT3689
Description  700mA Step-Down Regulator with Power-On Reset and Watchdog Timer
PDF  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3689 Datasheet(HTML) 5 Page - Linear Technology

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LT3689/LT3689-5
5
3689fa
TYPICAL PERFORMANCE CHARACTERISTICS
No-Load Supply Current vs VIN
No-Load Supply Current
Maximum Load Current, 5VOUT
Maximum Output Current, 3.3VOUT
Switch Current Limit
vs Duty Cycle
Switch Current Limit
vs Temperature
Switch Voltage Drop
Maximum VIN for Full Frequency
Maximum VIN for Full Frequency
INPUT VOLTAGE (V)
0
80
100
120
35
60
40
10
20
5
15
25
30
40
20
0
140
3689 G04
TA = 25°C
TEMPERATURE (°C)
–50
0
200
400
600
–25
0
25
50
100
75
125
800
100
300
500
700
150
3689 G05
CATCH DIODE: DIODES INC. B140HB
VIN = 12V
VOUT = 3.3V
INCREASED SUPPLY
CURRENT DUE TO
CATCH DIODE LEAKAGE
AT HIGH TEMPERATURE
0
0.4
0.8
1.2
0.2
0.6
1.0
1.4
VIN (V)
6
12
18
30
24
36
3689 G06
MINIMUM
TYPICAL
TA = 25°C
L = 12μH
f = 1MHz
0
0.4
0.2
0.6
0.3
0.1
0.5
0.7
LOAD CURRENT (A)
0
10
20
30
40
5
15
25
35
3689 G07
VO = 5V
L = 6.8μH
f = 2MHz
SYNC = 5V
TA = 25°C
TA = 85°C
0
0.4
0.2
0.6
0.3
0.1
0.5
0.7
LOAD CURRENT (A)
0
10
20
30
5
15
25
35
3689 G08
VO = 3.3V
L = 4.7μH
f = 2MHz
SYNC = 3.3V
TA = 25°C
TA = 85°C
VIN (V)
4
0
0.4
0.8
1.2
8
12
16
20
28
24
32
0.2
0.6
1.0
36
3689 G09
TA = 25°C
L = 12μH
f = 700kHz
MINIMUM
TYPICAL
DUTY CYCLE (%)
0
0
0.4
0.8
1.2
1.6
2.0
20
40
60
80
100
3689 G10
TA = 25°C
SYNC = LOW
MINIMUM
TYPICAL
TEMPERATURE (°C)
0
0.5
1.0
1.5
2.0
3689 G11
SYNC = HIGH
SYNC = LOW
–50 –25
0
25
50
100
75
125 150
SWITCH CURRENT (mA)
0
400
500
300
200
400
800
200
600
1000
100
0
600
3689 G12
TA = 125°C
TA = 25°C
TA = –50°C



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