Datasheet

LTC3112
6
3112fc
For more information www.linear.com/LTC3112
Typical perForMance characTerisTics
T
A
= 25°C, V
IN
= 5.0V, V
OUT
= 5.0V unless otherwise specified
I
OUT
Pin Current vs Temperature
1.5A Load Current I
OUT
Voltage vs V
OUT
Current
RUN and PWM/SYNC Threshold
Voltage vs Temperature
PWM Mode
I
LIMIT
, I
PEAK
, I
REV
vs Temperature
Burst Mode Operation
I
PEAK
, I
ZERO
vs Temperature
I
OUT
Voltage vs V
IN
Normalized N-Channel MOSFET
Resistance vs Temperature
Feedback Pin Program Voltage
vs Temperature V
CC
and V
IN
UVLO vs Temperature
TEMPERATURE (°C)
–60
NORMALIZED N-CHANNEL MOSFET RESISTANCE
1.2
1.3
1.4
0.9
1.0
1.1
0.7
0.8
20 40 60 80 100 120 140 160–40 –20 0
3112 G13
TEMPERATURE (°C)
FEEDBACK PROGRAMMED VOLTAGE (V)
0.800
0.805
0.810
0.815
0.820
0.825
0.785
0.790
0.795
0.775
0.780
3112 G14
–60 20 40 60 80 100 120 140 160–40 –20 0
TEMPERATURE (°C)
UNDERVOLTAGE LOCKOUT (V)
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
1.7
1.8
1.9
1.5
1.6
3112 G15
V
IN
FALLING
V
IN
RISING
V
CC
FALLING
V
CC
RISING
–60 20 40 60 80 100 120 140 160–40 –20 0
TEMPERATURE (°C)
THRESHOLD VOLTAGE (V)
0.9
1.0
1.1
1.2
0.6
0.7
0.8
0.4
0.5
3112 G16
RUN FALLING
RUN RISING
PWM/SYNC FALLING
PWM/SYNC RISING
–60 20 40 60 80 100 120 140 160–40 –20 0
TEMPERATURE (°C)
L = 4.7µH
CURRENT (A)
8
10
12
2
4
6
–2
0
3112 G17
I
PEAK
I
LIMIT
I
REV
–60 20 40 60 80 100 120 140 160–40 –20 0
TEMPERATURE (°C)
CURRENT (A)
1.5
2.0
0.5
1.0
0
3112 G18
I
ZERO
I
PEAK
L = 4.7µH
–60 20 40 60 80 100 120 140 160–40 –20 0
TEMPERATURE (°C)
I
OUT
PIN CURRENT (µA)
38
39
40
34
35
36
37
32
33
3112 G19
–60 20 40 60 80 100 120 140 160–40 –20 0
V
OUT
CURRENT (A)
0
I
OUT
VOLTAGE (mV)
2500
3000
3500
1000
1500
2000
0
500
1.5 2 2.5 3 3.50.5 1
3112 G20
V
IN
= 12V
V
IN
= 8V
V
IN
= 5V
V
IN
= 3V
R
IOUT
= 42.2k, C
IOUT
= 100pF,
V
OUT
= 5V, 750kHz
V
IN
(V)
2 3
I
OUT
VOLTAGE (mV)
1500
2000
2500
500
1000
0
8 97 10 11 12 13 14 154 5 6
3112 G21
I
OUT
= 2A
I
OUT
= 1.5A
I
OUT
= 1A
I
OUT
= 500mA
R
IOUT
= 42.2k, C
IOUT
= 100pF,
V
OUT
= 5V, 750kHz