LT1370IR datasheet(5/16 Pages) LINER

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LT1370

TYPICAL PERFORMANCE CHARACTERISTICS

TEMPERATURE (

°C)

–50

400

500

600

150

LT1370 • G11

300

200

100

800

700

–25

125

VFB =VREF

Feedback Input Current

vs Temperature

TEMPERATURE (

°C)

–50

–30

LT1370 • G12

–40

–10

–20

–25

100 125

150

VNFB =VNFR

Negative Feedback Input Current

vs Temperature

VC Pin Threshold and High

Clamp Voltage vs Temperature

TEMPERATURE (

°C)

–50

1.0

1.4

2.2

LT1370 • G10

1.2

1.8

2.0

1.6

–25

100 125

150

VC HIGH CLAMP

VC THRESHOLD

PIN FUNCTIONS

VC: The Compensation pin is used for frequency compen-

sation, current limiting and soft start. It is the output of the

error amplifier and the input of the current comparator.

Loop frequency compensation can be performed with an

RC network connected from the VC pin to ground. See

Applications Information.

FB: The Feedback pin is used for positive output voltage

sensing and oscillator frequency shifting. It is the invert-

ing input to the error amplifier. The noninverting input of

this amplifier is internally tied to a 1.245V reference.

NFB: The Negative Feedback pin is used for negative

output voltage sensing. It is connected to the inverting

input of the negative feedback amplifier through a 100k

source resistor.

S/S: Shutdown and Synchronization Pin. The S/S pin is

logic level compatible. Shutdown is active low and the

shutdown threshold is typically 1.3V. For normal opera-

tion, pull the S/S pin high, tie it to VIN or leave it floating. To

synchronize switching, drive the S/S pin between 600kHz

and 800kHz. See Applications Information.

VIN: Bypass Input Supply Pin with a Low ESR Capacitor,

µF or More. The regulator goes into undervoltage lock-

out when VIN drops below 2.5V. Undervoltage lockout

stops switching and pulls the VC pin low.

VSW: The Switch pin is the collector of the power switch

and has large currents flowing through it. Keep the traces

to the switching components as short as possible to

minimize radiation and voltage spikes.

GND: Tie all ground pins to a good quality ground plane.

See Applications Information.

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