LT1512CS8 datasheet(3/12 Pages) LINER

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LT1512

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VSAT

Output Switch ON Resistance

ISW = 2A

0.5

0.8

Ω

ILIM

Switch Current Limit

Duty Cycle = 50%

1.5

1.9

2.7

Duty Cycle = 80% (Note 1)

1.3

1.7

2.5

∆IIN

Supply Current Increase During Switch ON Time

mA/A

∆ISW

Control Voltage to Switch Current

2A/V

Transconductance

Minimum Input Voltage

2.4

2.7

Supply Current

2.7V

≤ VIN ≤ 25V

5.5

Shutdown Supply Current

2.7V

≤ VIN ≤ 25V, VS/S ≤ 0.6V

°C ≤ TJ ≤ 125°C

µA

–40

°C ≤ TJ ≤ 0°C (LT1512I)

µA

Shutdown Threshold

2.7V

≤ VIN ≤ 25V

0.6

1.3

Shutdown Delay

512

µs

S/S Pin Input Current

≤ VS/S ≤ 5V

–10

µA

Synchronization Frequency Range

600

800

kHz

ELECTRICAL C

HARA TERISTICS

VIN = 5V, VC = 0.6V, VFB = VREF, IFB = 0V, VSW and S/S pins open, unless otherwise noted.

The q denotes specifications which apply over the full operating

temperature range.

Note 1: For duty cycles (DC) between 50% and 85%, minimum

guaranteed switch current is given by ILIM = 0.667 (2.75 – DC).

Note 2: The IFB pin is servoed to its regulating state with VC = 0.8V.

Note 3: Commercial devices are guaranteed over 0

°C to 125°C junction

temperature range and 0

°C to 70°C ambient temperature range. These

parts are also designed, characterized and expected to operate over the

–20

°C to 85°C extended ambient temperature range, but are not tested at

–20

°C or 85°C. Devices with full guaranteed electrical specifications over

the ambient temperature range – 40

°C to 85°C are available as industrial

parts with an “I” suffix.

Maximum allowable ambient temperature may be limited by power

dissipation. Parts may not necessarily be operated simultaneously at

maximum power dissipation and maximum ambient temperature.

Temperature rise calculations must be done as shown in the Applications

Information section to ensure that maximum junction temperature does

not exceed 125

°C limit. With high power dissipation, maximum ambient

temperature may be less than 70

°C.

TYPICAL PERFORMANCE CHARACTERISTICS

Switch Saturation Voltage

vs Switch Current

Minimum Input Voltage

vs Temperature

Switch Current Limit

vs Duty Cycle

SWITCH CURRENT (A)

0.6

0.8

1.0

1.6

1512 G01

0.4

0.2

0.5

0.7

0.9

0.3

0.1

0.4

0.8

1.2

2.0

1.4

0.2

0.6

1.0

1.8

100

°C

150

°C

–55

°C

DUTY CYCLE (%)

3.0

2.5

2.0

1.5

1.0

0.5

1512 G02

100

°C AND

125

°C

–55

°C

TEMPERATURE (

°C)

–50

1.8

2.0

2.2

2.4

2.6

050

100

150

1512 G03

2.8

3.0

–25

125

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