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LT1766/LT1766-5

1766fc

PIN FUNCTIONS

TYPICAL PERFORMANCE CHARACTERISTICS

Switching Frequency

BOOST Pin Current

Minimum Input Voltage with 5V

Output

Switch Voltage Drop

JUNCTION TEMPERATURE (°C)

–50

100

1766 G10

230

220

210

200

190

180

170

–25

150

125

LOAD CURRENT (A)

1766 G11

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

7.5

7.0

6.5

6.0

5.5

5.0

MINIMUM INPUT

VOLTAGE TO START

MINIMUM INPUT

VOLTAGE TO RUN

TA = 25°C

SWITCH CURRENT (A)

0.5

1.5

1766 G12

TA = 25°C

JUNCTION TEMPERATURE (°C)

–50

1.5

1.7

2.1

1766 G13

1.3

1.1

–25

100

150

125

0.9

0.7

1.9

SWITCH CURRENT (A)

0.5

1.5

1766 G14

450

400

350

300

250

200

150

100

TJ = 125°C

TJ = 150°C

TJ = 25°C

TJ = –40°C

JUNCTION TEMPERATURE (°C)

–50

400

500

600

1766 G15

300

200

–25

100

150

125

100

VC Pin Shutdown Threshold

Switch Minimum On-Time

vs Temperature

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.

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