LT3990 데이터 시트보기 (PDF) - Linear Technology
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LT3990
Linear Technology
LT3990 Datasheet PDF : 20 Pages
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LT3990
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBD = 3.3V unless otherwise noted. (Note 2)
PARAMETER
Minimum Input Voltage
Quiescent Current from VIN
Feedback Voltage
FB Pin Bias Current (Note 3)
FB Voltage Line Regulation
Switching Frequency
Switch Current Limit
Catch Schottky Current Limit
Switch VCESAT
Switch Leakage Current
Catch Schottky Forward Voltage
Catch Schottky Reverse Leakage
Boost Schottky Forward Voltage
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
BOOST Pin Current
EN/UVLO Pin Current
EN/UVLO Voltage Threshold
EN/UVLO Voltage Hysteresis
PG Threshold Offset from Feedback Voltage
PG Hysteresis as % of Output Voltage
PG Leakage
PG Sink Current
Minimum Switch On-Time
Minimum Switch Off-Time
CONDITIONS
VEN/UVLO Low
VEN/UVLO High
VEN/UVLO High
4.2V < VIN < 40V
RT = 41.2k, VIN = 6V
RT = 158k, VIN = 6V
RT = 768k, VIN = 6V
VIN = 5V, VFB = 0V
VIN = 5V
ISW = 200mA
ISCH = 100mA, VIN = VBD = NC
VSW = 12V
ISCH = 50mA, VIN = NC, VBOOST = 0V
VREVERSE = 12V
VIN = 5V
ISW = 200mA, VBOOST = 15V
VEN/UVLO = 12V
EN/UVLO Rising, VIN ≥ 4.2V
VFB Rising
VPG = 3V
VPG = 0.4V
VIN = 10V
MIN
l
l
1.195
l 1.185
l
1.84
672
168
535
360
l
l 1.14
6.5
l 30
l
TYP
4
0.7
1.9
1.21
1.21
0.1
0.0002
2.3
840
210
700
450
210
0.05
725
0.05
900
0.02
1.4
8.5
1
1.21
32
10
1.0
0.01
80
115
100
MAX
4.2
1.2
2.8
4
1.225
1.235
20
0.01
2.76
1008
252
865
540
2
2
2
1.8
12
30
1.28
13.5
1
160
UNITS
V
µA
µA
µA
V
V
nA
%/V
MHz
kHz
kHz
mA
mA
mV
µA
mV
µA
mV
µA
V
mA
nA
V
mV
%
%
µA
µA
ns
ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3990E 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
LT3990I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 3: Bias current flows into the FB pin.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
3990f
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