LT3433
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications that apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= 13.8V, V
FB
= 1.25V, V
OUT
= 5V, V
BURST_EN
= 0V, V
BST
– V
IN
= 5V, unless otherwise noted.
SYMBOL
∆V
FB
I
FB
g
m
A
V
I
SW
/V
VC
f
O
PARAMETER
Feedback Reference Line Regulation
V
FB
Pin Input Bias Current
Error Amplifier Transconductance
Error Amplifier Voltage Gain
Control Voltage to Switch Transconductance
Operating Frequency
Foldback Frequency
t
ON(MIN)
t
OFF(MIN)
Minimum Switch On Time
Minimum Switch Off Time
V
FB
> 1V
q
CONDITIONS
5.5V
≤
V
IN
≤
60V
q
q
q
MIN
TYP
0.002
35
MAX
0.01
100
330
UNITS
%/V
nA
umhos
dB
A/V
200
270
66
0.55
185
170
200
50
215
230
450
800
kHz
kHz
kHz
ns
ns
V
FB
= 0V
R
L
= 35Ω (Note 4)
R
L
= 35Ω (Note 4)
q
q
250
500
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
Supply current specification does not include switch drive
currents. Actual supply currents will be higher.
Note 3:
“Normal Operation” supply current specification does not include
I
BIAS
currents. Powering the V
BIAS
pin externally reduces I
CC
supply
current.
Note 4:
Minimum times are tested using the high side switch with a 35Ω
load to ground.
Note 5:
This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 6:
The LT3433E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the – 40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3433I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
TYPICAL PERFOR A CE CHARACTERISTICS
Maximum Output Current
vs V
IN
500
V
OUT
= 5V
MAXIMUM OUTPUT CURRENT (mA)
BUCK
2.8
V
BIAS
OUTPUT VOLTAGE (V)
400
I
VIN
(µA)
300
200
BRIDGED
100
SEE TYPICAL APPLICATION
ON THE FIRST PAGE OF
THIS DATA SHEET
0
10
20
30
V
IN
(V)
40
50
60
3433 G11
0
U W
V
BIAS
Output Voltage
vs Temperature
620
V
IN
Supply Current
vs V
IN
Supply Voltage
T
A
= 25°C
590
2.6
560
2.4
530
2.2
–50
500
0
50
TEMPERATURE (°C)
100
125
0
15
30
V
IN
(V)
45
60
3433 G02
3433 G01
3433ia
3
LINER [ LINEAR TECHNOLOGY ]
