Datasheet

LT3956
6
3956f
Typical perForMance characTerisTics
Quiescent Current
vs Switching Frequency
INTV
CC
Current Limit
vs Temperature INTV
CC
Voltage vs Temperature
T
A
= 25°C, unless otherwise noted.
INTV
CC
Dropout Voltage
vs INTV
CC
Current
SW Pin Current Limit
vs Duty Cycle
LED Current Sense Threshold
vs FB Voltage
0
4
8
12
2
6
10
3956 G13
V
IN
CURRENT (mA)
SWITCHING FREQUENCY (kHz)
0 400
800
200
600
1000
3956 G14
INTV
CC
CURRENT LIMIT (mA)
TEMPERATURE (°C)
10
14
20
12
16
18
–50 0
50
75
–25
25
100
125
NOT SWITCHING
3956 G15
INTV
CC
(V)
TEMPERATURE (°C)
–50 0
50
75
–25
25
100
125
7.0
7.2
7.4
7.1
7.3
DUTY CYCLE (%)
2.5
SW PIN CURRENT LIMIT (A)
3.5
4.5
3.0
4.0
3956 G16
0 25 50 75 100
FB VOLTAGE (V)
3956 G17
1.2 1.22 1.24 1.26 1.28
0
125.0
312.5
62.50
187.5
250.0
V
(ISP–ISN)
THRESHOLD (mV)
V
CTRL
= 2V
LDO CURRENT (mA)
0
–2.5
LDO DROPOUT (V)
–2.0
–1.5
–1.0
–0.5
0
3
6 9 12 15
3956 G18
–40°C
25°C
125°C
PWMOUT Waveform
Switch On-Resistance
vs Temperature
ISP/ISN Input Bias Current
vs CTRL Voltage
CTRL (V)
0
INPUT BIAS CURRENT (µA)
40
80
20
60
3956 G19
0 0.5 1 1.5 2
ISP
ISN
TEMPERATURE (°C)
–50
ON-RESISTANCE (mΩ)
120
140
160
100
80
–25 250 50 75 100 125
20
0
60
180
40
3956 G20
200ns/DIV
PWM
INPUT
PWMOUT
5V/DIV
3956 G21
C
PWMOUT
= 2.2nF