LT1767 查看數據表（PDF） - Linear Technology

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产品描述 (功能)

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LT1767

Monolithic 1.5A, 1.25MHz Step-Down Switching Regulators

Linear Technology 

LT1767/LT1767-1.8/

LT1767-2.5/LT1767-3.3/LT1767-5

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.

TYPICAL PERFORMANCE Characteristics TA = 25°C, unless otherwise noted.

FB vs Temperature (Adj)

1.22

Switch On Voltage Drop

400

125°C

350

Oscillator Frequency

1.50

1.45

1.21

300

25°C

1.40

250

1.35

–40°C

1.20

200

1.30

150

1.25

1.19

100

1.20

50

1.15

1.18

0

–50 –25 0 25 50 75 100 125

0

TEMPERATURE (°C)

1767 G01

0.5

1

SWITCH CURRENT (A)

1.5

1767 G02

1.10

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1767 G03

SHDN Threshold vs Temperature

1.40

1.38

1.36

1.34

1.32

1.30

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1767 G04

SHDN Supply Current vs VIN

7

SHDN = 0V

6

5

4

3

2

1

0

0

5 10 15 20 25 30

VIN (V)

1767 G05

SHDN IP Current vs Temperature

–12

–10

SHUTTING DOWN

–8

–6

–4

STARTING UP

–2

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1767 G06

1767fb

4

For more information www.linear.com/LT1767

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