3433EFE 데이터 시트보기 (PDF) - Linear Technology
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3433EFE Datasheet PDF : 16 Pages
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LT3433
ELECTRICAL CHARACTERISTICS
The q denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VIN = 13.8V, VFB = 1.25V, VOUT = 5V, VBURST_EN = 0V, VBST – VIN = 5V, unless otherwise noted.
SYMBOL
VFB
∆VFB
IFB
gm
AV
ISW/VVC
fO
VBURST_EN
IBURST_EN
tON(MIN)
tOFF(MIN)
PARAMETER
Feedback Reference Voltage
CONDITIONS
Feedback Reference Line Regulation
VFB Pin Input Bias Current
Error Amplifier Transconductance
Error Amplifier Voltage Gain
Control Voltage to Switch Transconductance
Operating Frequency
5.5V ≤ VIN ≤ 60V
VFB > 1V
Foldback Frequency
Burst Enable Threshold
Input Bias Current
Minimum Switch On Time
Minimum Switch Off Time
VFB = 0V
VBURST_EN ≥ 2V
RL = 35Ω (Note 4)
RL = 35Ω (Note 4)
MIN
1.224
q 1.215
q
q
q 200
185
q 170
q
q
TYP
1.231
0.002
35
270
66
0.6
200
50
0.8
35
250
500
MAX
1.238
1.245
0.01
100
330
215
230
450
800
UNITS
V
V
%/V
nA
umhos
dB
A/V
kHz
kHz
kHz
V
µA
ns
ns
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
IBIAS currents. Powering the VBIAS pin externally reduces ICC 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 VIN
500
BUCK
400
VOUT = 5V
TA = 25°C
300
200
100
0
0
BRIDGED
SEE TYPICAL APPLICATION
ON THE FIRST PAGE OF
THIS DATA SHEET
10 20 30 40
VIN (V)
50 60
3433 G11
VBIAS Output Voltage
vs Temperature
2.8
2.6
2.4
2.2
–50
0
50
TEMPERATURE (°C)
100 125
3433 G01
VIN Supply Current
vs VIN Supply Voltage
620
TA = 25°C
590
560
530
500
0
15
30
VIN (V)
45
60
3433 G02
3433f
3
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