Datasheet

LT3976
7
3976f
For more information www.linear.com/3976
Typical perForMance characTerisTics
PG Thresholds
Minimum Input Voltage,
V
OUT
= 5V
Minimum Input Voltage,
V
OUT
= 3.3V
Burst Frequency
SS Pin Current Boost Capacitor Charger
Boost Diode Forward Voltage
Dropout Comparator Thresholds
T
A
= 25°C, unless otherwise noted.
TEMPERATURE (°C)
–55
PG THRESHOLD (V)
1.11
35
3976 G25
1.08
1.06
–25 5 65
1.05
1.04
1.12
1.10
1.09
1.07
95 125 155
FB RISING
FB FALLING
LOAD CURRENT (A)
0
INPUT VOLTAGE (V)
5.5
6.0
6.5
4
3976 G26
5.0
4.5
4.0
1
2
3
5
V
OUT
= 5V
f
SW
= 800kHz
TO RUN/TO START
LOAD CURRENT (A)
0
INPUT VOLTAGE (V)
4.0
4.5
5.0
4
3976 G27
3.5
3.0
2.5
1
2
3
5
V
OUT
= 3.3V
FRONT PAGE APPLICATION
TO RUN/TO START
LOAD CURRENT (mA)
0
SWITCHING FREQUENCY (kHz)
500
600
700
160
3976 G28
400
300
0
40
80
120
20
60
100
140
200
100
900
800
V
OUT
= 5V
f
SW
= 800kHz
V
OUT
= 3.3V
f
SW
= 600kHz
TEMPERATURE (°C)
–55
SS PIN CURRENT (µA)
2.4
35
3976 G29
1.8
1.4
–25 5 65
1.2
1.0
2.6
2.2
2.0
1.6
95 125 155
V
SS
= 0.5V
OUT PIN VOLTAGE (V)
0
OUT PIN CURRENT (mA)
80
120
16
3976 G30
40
0
4
8
12
2
6
10
14
160
60
100
20
140
V
BST
= V
IN
BOOST DIODE CURRENT (A)
0
BOOST DIODE VOLTAGE (V)
0.8
1.0
1.2
2
3976 G31
0.6
0.4
0
0.5
1
1.5
0.2
1.6
1.4
TEMPERATURE (°C)
–55
400
DROPOUT THRESHOLD (mV)
420
460
480
500
600
540
5
65
95 125
3976 G32
440
560
580
520
–25
35
155
V
OUT
RISING
V
OUT
FALLING