Datasheet

LT3976
6
3976f
For more information www.linear.com/3976
Typical perForMance characTerisTics
Switch V
CESAT
BOOST Pin Current
Minimum On-Time
Minimum Off-Time
T
A
= 25°C, unless otherwise noted.
Switching Frequency
Internal Undervoltage Lockout
(UVLO)
R
T
Programmed Switching
Frequency
Frequency Foldback
EN Thresholds
SWITCH CURRENT (A)
0
250
300
350
4
3976 G16
200
150
1 2 3 5
100
50
0
V
CESAT
(mV)
SWITCH CURRENT (A)
0
0
BOOST PIN CURRENT (mA)
10
30
40
50
2
4
5
90
3976 G17
20
1 3
60
70
80
TEMPERATURE (°C)
–55
140
160
200
35 95
3976 G18
120
100
–25 5
65 125 155
80
60
180
MINIMUM ON-TIME (ns)
LOAD = 1A
LOAD = 2.5A
LOAD = 5A
V
SYNC
= 0V
f
SW
= 2MHz
TEMPERATURE (°C)
–55
175
200
250
35 95
3976 G19
150
125
–25 5
65 125 155
100
225
MINIMUM OFF-TIME (ns)
LOAD = 5A
LOAD = 2.5A
LOAD = 1A
V
SYNC
= 0V
f
SW
= 2MHz
TEMPERATURE (°C)
–55
SWITCHING FREQUENCY (kHz)
660
720
780
35 95
3976 G20
600
540
–25 5
65 125 155
480
420
SWITCHING FREQUENCY (MHz)
0.2
0
R
T
RESISTOR (kΩ)
50
150
200
250
350
0.4
1.2
1.6
3976 G21
100
300
1
2
2.2
0.6
0.8
1.4 1.8
TEMPERATURE (°C)
–55
INPUT VOLTAGE (V)
4
5
6
35 95
3976 G23
3
2
–25 5
65 125 155
1
0
TEMPERATURE (°C)
–55
EN THRESHOLD (V)
1.08
35
3976 G24
1.05
1.03
–25 5 65
1.02
1.01
1.09
1.07
1.06
1.04
95 125 155
EN RISING
EN FALLING
FB PIN VOLTAGE (V)
0
700
600
500
400
300
200
100
0
0.6 1
3976 G22
0.2 0.4
0.8 1.2
SWITCHING FREQUENCY (kHz)