LT1074 データシートの表示（PDF） - Linear Technology

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LT1074

Step-Down Switching Regulator

Linear Technology 

LT1074/LT1076

ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. Tj = 25°C, VIN = 25V, unless otherwise noted.

PARAMETER

Switch “On” Voltage (Note 2)

Switch “Off” Leakage

Supply Current (Note 3)

Minimum Supply Voltage

Switch Current Limit (Note 5)

Maximum Duty Cycle

Switching Frequency

Switching Frequency Line Regulation

Error Amplifier Voltage Gain (Note 7)

Error Amplifier Transconductance

Error Amplifier Source and Sink Current

Feedback Pin Bias Current

Reference Voltage

Reference Voltage Tolerance

Reference Voltage Line Regulation

VC Voltage at 0% Duty Cycle

Multiplier Reference Voltage

Shutdown Pin Current

Shutdown Thresholds

Thermal Resistance Junction to Case

CONDITIONS

LT1074

LT1076

LT1074

LT1076

ISW = 1A, Tj ≥ 0°C

ISW = 1A, Tj < 0°C

ISW = 5A, Tj ≥ 0°C

ISW = 5A, Tj < 0°C

ISW = 0.5A

ISW = 2A

VIN ≤ 25V, VSW = 0

VIN = VMAX, VSW = 0 (Note 8)

VIN = 25V, VSW = 0

VIN = VMAX, VSW = 0 (Note 8)

VFB = 2.5V, VIN ≤ 40V

40V < VIN < 60V

VSHUT = 0.1V (Device Shutdown) (Note 9)

Normal Mode

Startup Mode (Note 4)

LT1074

LT1076

ILIM Open

RLIM = 10k (Note 6)

RLIM = 7k (Note 6)

ILIM Open

RLIM = 10k (Note 6)

RLIM = 7k (Note 6)

Tj ≤ 125°C

Tj > 125°C

VFB = 0V through 2kΩ (Note 5)

8V ≤ VIN ≤ VMAX (Note 8)

1V ≤ VC ≤ 4V

Source (VFB = 2V)

Sink (VFB = 2.5V)

VFB = VREF

VC = 2V

VREF (Nominal) = 2.21V

All Conditions of Input Voltage, Output

Voltage, Temperature and Load Current

8V ≤ VIN ≤ VMAX (Note 8)

Over Temperature

VSH = 5V

VSH ≤ VTHRESHOLD (≅2.5V)

Switch Duty Cycle = 0

Fully Shut Down

LT1074

LT1076

MIN TYP MAX UNITS

1.85

V

2.1

V

2.3

V

2.5

V

q

1.2

V

q

1.7

V

5

300

µA

10

500

µA

150

µA

250

µA

q

8.5

11

mA

q

9

12

mA

q

140 300

µA

q

7.3

8

V

q

3.5

4.8

V

q 5.5

6.5

8.5

A

4.5

A

3

A

q2

2.6

3.2

A

1.8

A

1.2

A

q 85

90

%

90

100 110

kHz

q 85

120

kHz

q 85

125

kHz

20

kHz

q

0.03

0.1

%/V

2000

V/V

3700 5000 8000 µmho

100 140 225

µA

0.7

1

1.6

mA

q

0.5

2

µA

q 2.155 2.21 2.265

V

±0.5 ±1.5

%

q

±1

±2.5

%

q

q

q5

q

q 2.2

q 0.1

0.005 0.02

%/V

1.5

V

–4

mV/°C

24

V

10

20

µA

50

µA

2.45

2.7

V

0.3

0.6

V

2.5

°C/W

4.0

°C/W

1074fd

3

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