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LT1767/LT1767-1.8/

LT1767-2.5/LT1767-3.3/LT1767-5

sn1767 1767fas

ELECTRICAL CHARACTERISTICS

FB Input Resistance

LT1767-1.8

10.5

Ω

LT1767-2.5

14.7

Ω

LT1767-3.3

27.5

Ω

LT1767-5

Ω

Error Amp Voltage Gain

0.4V < VC < 0.9V

150

350

Error Amp Transconductance

∆IVC = ±10µA

500

850

1300

µMho

VC Pin Source Current

VFB = VNOM – 17%

120

160

µA

VC Pin Sink Current

VFB = VNOM + 17%

110

180

µA

VC Pin to Switch Current Transconductance

2.5

A/V

VC Pin Minimum Switching Threshold

Duty Cycle = 0%

0.35

VC Pin 1.5A ISW Threshold

0.9

Maximum Switch Duty Cycle

VC = 1.2V, ISW = 400mA

Minimum Boost Voltage Above Switch

ISW = –1.5A, 0°C ≤ TA ≤ 125°C and –1.3A, TA < 0°C

1.8

2.7

Boost Current

ISW = – 0.5A (Note 4)

ISW = –1.5A, 0°C ≤ TA ≤ 125°C and –1.3A, TA < 0°C (Note 4)

SHDN Threshold Voltage

1.27

1.33

1.40

SHDN Input Current (Shutting Down)

SHDN = 60mV Above Threshold

–7

–10

–13

µA

SHDN Threshold Current Hysteresis

SHDN = 100mV Below Threshold

µA

SYNC Threshold Voltage

1.5

2.2

SYNC Input Frequency

1.5

MHz

SYNC Pin Resistance

ISYNC = 1mA

Ω

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

VIN = 15V, VC = 0.8V, Boost = VIN + 5V, SHDN, SYNC and switch open unless otherwise noted.

PARAMETER

CONDITION

MIN

TYP

MAX

UNITS

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

of a device may be impaired.

Note 2: The LT1767E is guaranteed to meet performance specifications

from 0

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

junction temperature range are assured by design, characterization and

correlation with statistical process controls.

Note 3: Minimum input voltage is defined as the voltage where the internal

regulator enters lockout. Actual minimum input voltage to maintain a

regulated output will depend on output voltage and load current. See

Applications Information.

Note 4: Current flows into the BOOST pin only during the on period of the

switch cycle.

TYPICAL PERFORMANCE CHARACTERISTICS

TEMPERATURE (

°C)

–50

–25

100

125

1767 G01

1.22

1.21

1.20

1.19

1.18

SWITCH CURRENT (A)

0.5

1.5

1767 G02

400

350

300

250

200

150

100

125

°C

–40

°C

FB vs Temperature (Adj)

Switch On Voltage Drop

Oscillator Frequency

TEMPERATURE (

°C)

–50

–25

100

125

1767 G03

1.50

1.45

1.40

1.35

1.30

1.25

1.20

1.15

1.10

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