LT1766/LT1766-5

5

1766fc

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

l

0.05

0.15

%/V

Df = 10kHz

0.8

V

Minimum Input Voltage

(Note 3)

l

4.6

5.5

V

Minimum Boost Voltage

l

1.8

3

V

Boost Current (Note 5)

l

l

12

45

40

100

mA

mA

1.4

2.2

mA

2.9

4.2

mA

Shutdown Supply Current

l

25

120

500

μA

μA

Lockout Threshold

l

2.3

2.42

2.68

V

Shutdown Thresholds

l

l

0.15

0.25

0.37

0.45

0.9

0.9

V

V

Minimum SYNC Amplitude

l

1.5

2.2

V

SYNC Frequency Range

228

700

kHz

SYNC Input Resistance

20

kΩ

(LT1766H Grade)

The

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

clamp level to 200mV below the upper clamp level.

Note 3: Minimum input voltage is not measured directly, but is guaranteed

by other tests. It is defined as the voltage where internal bias lines are still

regulated so that the reference voltage and oscillator remain constant.

Actual minimum input voltage to maintain a regulated output will depend

upon output voltage and load current. See Applications Information.

Note 4: This is the minimum voltage across the boost capacitor needed to

guarantee full saturation of the internal power switch.

Note 5: Boost current is the current flowing into the BOOST pin with the

pin held 5V above input voltage. It flows only during switch on time.

Note 6: Input supply current is the quiescent current drawn by the input

pin when the BIAS pin is held at 5V with switching disabled. Bias supply

current is the current drawn by the BIAS pin when the BIAS pin is held

at 5V. Total input referred supply current is calculated by summing input

by the forced current. See Typical Performance Characteristics for the

graph of switch voltage at other currents.

Note 8: The LT1766EGN, LT1766EGN-5, LT1766EFE and LT1766EFE-5

are guaranteed to meet performance specifications from 0°C to 125°C

junction temperature. Specifications over the –40°C to 125°C operating

junction temperature range are assured by design, characterization and

correlation with statistical process controls. The LT1766IGN, LT1766IGN-5,

LT1766IFE and LT1766IFE-5 are guaranteed over the full –40°C to 125°C

operating junction temperature range. The LT1766HGN and LT1766HFE are

guaranteed over the full –40°C to 140°C operating junction temperature

range.

Note 9: Transconductance and voltage gain refer to the internal amplifier

exclusive of the voltage divider. To calculate gain and transconductance,

refer to the SENSE pin on fixed voltage parts. Divide the values shown by

Note 10: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 140°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 11: High junction temperatures degrade operating lifetimes.

Operating lifetime at junction temperatures between 125°C and 140°C is

derated to 1000 hours.