Datasheet

LT3971A/LT3971A-5
6
3971af
TYPICAL PERFORMANCE CHARACTERISTICS
EN Threshold
Minimum Input Voltage
Minimum Input Voltage
Soft-Start
Minimum Switch On-Time/
Switch Off-Time
Boost Diode Forward Voltage
Power Good Threshold
Transient Load Response,
Load Current Stepped from 25mA
(Burst Mode Operation) to 525mA
Transient Load Response,
Load Current Stepped from
0.5A to 1A
T
A
= 25°C, unless otherwise noted.
TEMPERATURE (°C)
–55
SWITCH ON/OFF TIME (ns)
400
350
150
50
200
250
300
100
0
655
3971A G19
15535–25 95 125
MIN T
OFF
1A LOAD
MIN T
OFF
0.5A LOAD
MIN T
ON
SS PIN VOLTAGE (V)
0
SWITCH CURRENT LIMIT (A)
2.5
2.0
0.5
1.0
1.5
0
1.250.75
3971A G20
210.50.25 1.751.5
LOAD CURRENT (mA)
0
INPUT VOLTAGE (V)
5.0
4.8
4.0
3.4
3.6
4.2
4.4
4.6
3.8
3.2
3.0
800400
3971A G21
1200600200 1000
TO START
TO RUN
V
OUT
= 3.3V
LOAD CURRENT (mA)
0
INPUT VOLTAGE (V)
6.4
6.2
5.4
5.6
6.0
5.8
5.2
5.0
800400
3971A G22
1200600200 1000
TO START
TO RUN
V
OUT
= 5V
TEMPERATURE (°C)
THRESHOLD VOLTAGE (V)
3971A G23
1.05
0.97
0.96
1.03
1.02
1.01
1.00
0.99
0.98
1.04
0.95
–55 15535 65 125955–25
RISING THRESHOLD
FALLING THRESHOLD
BOOST DIODE CURRENT (mA)
BOOST DIODE VF (V)
3971A G24
1.6
0.4
0.2
1.2
1.0
0.8
0.6
1.4
0
0 1500500 750 12501000250
TEMPERATURE (°C)
THRESHOLD VOLTAGE (%)
3971A G25
95
88
87
86
93
92
91
90
89
94
85
–55 15535 65 125955–25
10µs/DIV
3971A G26
V
OUT
100mV/DIV
I
L
500mA/DIV
V
IN
= 12V, V
OUT
= 3.3V
C
OUT
= 47µF
10µs/DIV
3971A G27
V
OUT
100mV/
DIV
I
L
500mA/
DIV
V
IN
= 12V, V
OUT
= 3.3V
C
OUT
= 47µF