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LT3971 Datasheet(PDF) 3 Page - Linear Technology

Part # LT3971
Description  38V, 1.2A, 2MHz Step-Down Regulator with 2.8 Quiescent Current
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3971 Datasheet(HTML) 3 Page - Linear Technology

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LT3971
3
3971f
ELECTRICAL CHARACTERISTICS
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 LT3971E 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,
The
l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VEN = 12V, VBD = 3.3V unless otherwise noted. (Note 2)
characterization, and correlation with statistical process controls. The
LT3971I is guaranteed over the full –40°C to 125°C operating junction
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 3: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Input Voltage
l
4
4.3
V
Quiescent Current from VIN
VEN Low
VEN High, VSYNC Low
VEN High, VSYNC Low
l
0.7
1.7
1.2
2.7
4.5
μA
μA
μA
FB Pin Current
VFB = 1.19V
l
0.1
12
nA
Feedback Voltage
l
1.175
1.165
1.19
1.19
1.205
1.215
V
V
FB Voltage Line Regulation
4.3V < VIN < 40V
0.0002
0.01
%/V
Switching Frequency
RT = 11k
RT = 35.7k
RT = 255k
1.6
0.8
160
2
1
200
2.4
1.2
240
MHz
MHz
kHz
Minimum Switch On Time
80
ns
Minimum Switch Off Time
110
150
ns
Switch Current Limit
1.8
2.4
3
A
Switch VCESAT
ISW = 1A
330
mV
Switch Leakage Current
0.02
1
μA
Boost Schottky Forward Voltage
ISH = 100mA
770
mV
Boost Schottky Reverse Leakage
VREVERSE = 12V
0.02
1
μA
Minimum Boost Voltage (Note 3)
VIN = 5V
l
1.4
1.8
V
BOOST Pin Current
ISW = 1A, VBOOST = 15V
20
28
mA
EN Voltage Threshold
EN Rising
l
0.95
1.01
1.07
V
EN Voltage Hysteresis
30
mV
EN Pin Current
0.2
20
nA
PG Threshold Offset from VFB
VFB Rising
60
100
140
mV
PG Hysteresis
20
mV
PG Leakage
VPG = 3V
0.02
1
μA
PG Sink Current
VPG = 0.4V
l
300
570
μA
SYNC Threshold
0.6
0.8
1.0
V
SYNC Pin Current
0.1
nA
SS Source Current
VSS = 1V
0.6
1
1.6
μA



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