LT3667EUDD View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LT3667EUDD

Iq= 50uA at 12Vin to 5V, 3.3V and 2.5V with No Load / 40V 400mA Step-Down Switching Regulator with Dual Fault Protected LDOs

Linear Technology 

LT3667

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

Switch Current Limit

900

800

0% DUTY CYCLE

700

600

100% DUTY CYCLE

500

CATCH DIODE VALLEY CURRENT LIMIT

400

–50 –25

0 25 50 75 100 125 150

TEMPERATURE (°C)

3667 G10

Switching Frequency

2.4

2.2

RT = 37.4k

2.0

1.8

1.6

1.4

1.2

RT = 95.3k

1.0

0.8

0.6

0.4

RT = 487k

0.2

0

–50 –25

0 25 50 75 100 125 150

TEMPERATURE (°C)

3667 G11

Minimum Switch On-Time/

Switch-Off Time

200

LOAD CURRENT = 200mA

180

160

MINIMUM OFF-TIME

140

120

MINIMUM ON-TIME

100

80

60

40

20

0

–50 –25 0 25 50 75 100 125 150

TEMPERATURE (°C)

3667 G12

Switch VCESAT

600

500

400

300

200

TJ = –50°C

100

TJ = 25°C

TJ = 125°C

TJ = 150°C

0

0 100 200 300 400 500 600 700

SWITCH CURRENT (mA)

3667 G13

BOOST Pin Current

20

18

16

14

12

10

8

6

TA = 150°C

4

TA = 25°C

TA = –50°C

2

0 100 200 300 400 500 600

SWITCH CURRENT (mA)

3667 G14

Minimum Input Voltage,

VOUT = 3.3V

5.0

FRONT PAGE APPLICATION

VEN = VIN1, VOUT1 = 3.3V

4.5

TO START

4.0

TO RUN

3.5

3.0

3.5

0

50 100 150 200 250 300 350 400

LOAD CURRENT IOUT1 (mA)

3667 G15

Minimum Input Voltage,

VOUT = 5V

6.5

Transient Load Response,

Load Step 10mA to 140mA

FRONT PAGE APPLICATION

Transient Load Response

Load Step 150mA to 300mA

FRONT PAGE APPLICATION

6.0

TO START

5.5

TO RUN

VOUT1

100mV/DIV

VOUT1

100mV/DIV

5.0

IL

100mA/DIV

4.5

FRONT PAGE APPLICATION

VEN = VIN1, VOUT1 = 5V

4.0

0 50 100 150 200 250 300 350 400

LOAD CURRENT IOUT1 (mA)

3667 G16

IL

150mA/DIV

100µs/DIV

3667 G17

100µs/DIV

3667 G18

For more information www.linear.com/LT3667

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