LT3669 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT3669 Datasheet PDF : 40 Pages
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TYPICAL PERFORMANCE CHARACTERISTICS
LT3669/LT3669-2
Switching Frequency
630
VL+ = 24V
RT = 38.3kΩ
620
610
600
590
580
570
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
36692 G19
Switching Frequency
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
20 40 60 80
RT (kΩ)
100 120
36692 G20
Minimum Switch-On Time/
Switch Off-Time
180
160
MINIMUM OFF-TIME
140
120
100
80
MINIMUM ON-TIME
60
40
20
BUCK LOAD CURRENT = 150mA
0
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
125 150
36692 G22
Maximum Buck Output Current,
VOUT = 5V
500
450
400
LT3669-2, L = 33µH
350
300
250
200
150
100
50
0
5
LT3669, L = 82µH
TYPICAL
MINIMUM
f = 600kHz
DIO PIN FLOATING
10 15 20 25 30 35 40
VL+ (V)
36692 G23
Catch Diode Forward Voltage
(LT3669 Only)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0 10 20 30 40 50 60 70 80 90 100
CATCH DIODE CURRENT (mA)
36692 G25
Maximum Buck Output Current,
VOUT = 3.3V
500
450
400
LT3669-2, L = 33µH
350
300
250
200
150
100
50
0
5
LT3669, L = 82µH
TYPICAL
MINIMUM
f = 400kHz
DIO PIN FLOATING
10 15 20 25 30 35 40
VL+ (V)
36692 G25
For more information www.linear.com/LT3669
Frequency Foldback
700
RT = 38.3kΩ
600
500
400
300
200
100
0
0 100 200 300 400 500 600 700 800
FBOUT PIN VOLTAGE (mV)
36692 G21
Efficiency, VOUT = 5V
95
ALL LT3669 CURRENT INCLUDED
85
f = 600kHz, VTXEN = 0V, VILIM = 0V
DIO PIN FLOATING
75
65
55
45
35
LT3669 VL+ : LT3669-2 VL+ :
12V
12V
25
24V
24V
36V
36V
15
0 50 100 150 200 250 300
BUCK LOAD CURRENT (mA)
36692 G24
Efficiency, VOUT = 3.3V
90
ALL LT3669 CURRENT INCLUDED
80
f = 400kHz, VTXEN = 0V, VILIM = 0V
DIO PIN FLOATING
70
60
50
40
30
LT3669 VL+ : LT3669-2 VL+ :
12V
12V
20
24V
24V
36V
36V
10
0 50 100 150 200 250 300
BUCK LOAD CURRENT (mA)
36692 G27
3669fa
9
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