Datasheet

LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
4
1767fb
For more information www.linear.com/LT1767
TEMPERATURE (°C)
–50
–25 0 25 50 75 100 125
SHDN THRESHOLD (V)
1767 G04
1.40
1.38
1.36
1.34
1.32
1.30
V
IN
(V)
0 5 10 15 20 25 30
V
IN
CURRENT (µA)
1767 G05
7
6
5
4
3
2
1
0
SHDN = 0V
SHDN I
P
Current vs Temperature
SHDN Threshold vs Temperature SHDN Supply Current vs V
IN
TEMPERATURE (°C)
–50
–25 0 25 50 75 100 125
SHDN INPUT (µA)
1767 G06
–12
–10
–8
–6
–4
–2
0
STARTING UP
SHUTTING DOWN
TEMPERATURE (°C)
–50
–25 0 25 50 75 100 125
FB VOLTAGE (V)
1767 G01
1.22
1.21
1.20
1.19
1.18
SWITCH CURRENT (A)
0 0.5
1 1.5
SWITCH VOLTAGE (mV)
1767 G02
400
350
300
250
200
150
100
50
0
125°C
25°C
–40°C
FB vs Temperature (Adj) Switch On Voltage Drop Oscillator Frequency
TEMPERATURE (°C)
–50
–25 0 25 50 75 100 125
FREQUENCY (MHz)
1767 G03
1.50
1.45
1.40
1.35
1.30
1.25
1.20
1.15
1.10
Typical perForMance characTerisTics
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 LT1767E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: Minimum input voltage is defined as the voltage where the internal
regulator enters lockout. Actual minimum input voltage to maintain a
regulated output will depend on output voltage and load current. See
Applications Information.
Note 4: Current flows into the BOOST pin only during the on period of the
switch cycle.
T
A
= 25°C, unless otherwise noted.
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