1766 查看數據表（PDF） - Linear Technology

零件编号

产品描述 (功能)

生产厂家

1766

5.5V to 60V 1.5A, 200kHz Step-Down Switching Regulator

Linear Technology 

TYPICAL PERFORMANCE CHARACTERISTICS

Switching Frequency

230

220

210

200

190

180

170

–50 –25 0 25 50 75 100 125 150

JUNCTION TEMPERATURE (°C)

1766 G10

Minimum Input Voltage with 5V

Output

7.5

TA = 25°C

7.0

6.5

MINIMUM INPUT

VOLTAGE TO START

6.0

5.5

MINIMUM INPUT

VOLTAGE TO RUN

5.0

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

LOAD CURRENT (A)

1766 G11

VC Pin Shutdown Threshold

2.1

1.9

1.7

1.5

1.3

1.1

0.9

0.7

–50 –25 0 25 50 75 100 125 150

JUNCTION TEMPERATURE (°C)

1766 G13

Switch Voltage Drop

450

400

TJ = 150°C

350

300

TJ = 125°C

250

TJ = 25°C

200

150

TJ = –40°C

100

50

0

0

0.5

1

1.5

SWITCH CURRENT (A)

1766 G14

LT1766/LT1766-5

BOOST Pin Current

45 TA = 25°C

40

35

30

25

20

15

10

5

0

0

0.5

1

SWITCH CURRENT (A)

1.5

1766 G12

Switch Minimum On-Time

vs Temperature

600

500

400

300

200

100

0

–50 –25 0 25 50 75 100 125 150

JUNCTION TEMPERATURE (°C)

1766 G15

PIN FUNCTIONS

GND (Pins 1, 8, 9, 16, 17): The GND pin connections act

as the reference for the regulated output, so load regula-

tion will suffer if the ground end of the load is not at the

same voltage as the GND pins of the IC. This condition will

occur when load current or other currents flow through

metal paths between the GND pins and the load ground.

Keep the paths between the GND pins and the load ground

short and use a ground plane when possible. The GND

pin also acts as a heat sink and should be soldered to a

large copper plane to reduce thermal resistance. For the

FE package, the exposed pad should be soldered to the

copper ground plane underneath the device. (See Applica-

tions Information—Layout Considerations.)

SW (Pin 2): The switch pin is the emitter of the on-chip

power NPN switch. This pin is driven up to the input pin

voltage during switch on-time. Inductor current drives the

switch pin negative during switch off-time. Negative volt-

age is clamped with the external catch diode. Maximum

negative switch voltage allowed is – 0.8V.

NC (Pins 3, 5, 7, 13): No Connection.

1766fc

7

Share Link: