LT1776CS8 datasheet(3/20 Pages) LINER

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LT1776

ELECTRICAL CHARACTERISTICS

The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.

VIN = 40V, VSW open, VCC = 5V, VC = 1.4V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Timing

Switching Frequency

180

200

220

kHz

170

230

kHz

Maximum Switch Duty Cycle

tON(MIN)

Minimum Switch On Time

High dV/dt Mode, RL = 39Ω (Note 4)

300

Boost Operation

VC Pin Boost Threshold

1.35

dV/dt Below Threshold

0.2

V/ns

dV/dt Above Threshold

1.6

V/ns

Sync Function

Minimum Sync Amplitude

1.5

2.2

Synchronization Range

(Note 6)

250

400

kHz

SYNC Pin Input R

Ω

SHDN Pin Function

VSHDN

Shutdown Mode Threshold

0.5

0.2

0.8

Upper Lockout Threshold

Switching Action On

1.260

Lower Lockout Threshold

Switching Action Off

1.245

ISHDN

Shutdown Pin Current

VSHDN = 0V

µA

VSHDN = 1.25V

2.5

µA

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: Control circuitry powered from VCC.

Note 3: Switch current limit is DC trimmed and tested in production.

Inductor dl/dt rate will cause a somewhat higher current limit in actual

application.

Note 4: Minimum switch on time is production tested with a 39

Ω resistive

load to ground.

Note 5: Parts are guaranteed to survive 60V on VIN and VSW. However,

thermal constraints will limit VIN in some applications, depending primarily

on maximum output current and switching frequency. See Applications

section for more information.

Note 6: Internal oscillator is guaranteed to sync up to 400kHz. However,

thermal constraints and/or controllability issues may place a lower limit on

switching frequency in actual usage. See Applications section for more

information.

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