LT1376 Ver la hoja de datos (PDF) - Linear Technology

Número de pieza

componentes Descripción

Fabricante

LT1376

1.5A, 500kHz Step-Down Switching Regulators

Linear Technology 

LT1375/LT1376

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

temperature range, otherwise specifications are at TA = 25°C. TJ = 25°C, VIN = 15V, VC = 1.5V, boost open, switch open,

unless otherwise noted.

PARAMETER

Reference Voltage (Adjustable)

Sense Voltage (Fixed 5V)

Sense Pin Resistance

Reference Voltage Line Regulation

Feedback Input Bias Current

Error Amplifier Voltage Gain

Error Amplifier Transconductance

VC Pin to Switch Current Transconductance

Error Amplifier Source Current

Error Amplifier Sink Current

VC Pin Switching Threshold

VC Pin High Clamp

Switch Current Limit

VBOOST = VIN + 5V

Switch On Resistance (Note 6)

Maximum Switch Duty Cycle

Switch Frequency

Switch Frequency Line Regulation

Frequency Shifting Threshold on FB Pin

Minimum Input Voltage (Note 3)

Minimum Boost Voltage (Note 4)

Boost Current (Note 5)

Input Supply Current (Note 6)

Output Supply Current (Note 6)

Shutdown Supply Current

Lockout Threshold

CONDITIONS

MIN TYP MAX UNITS

All Conditions

2.39 2.42 2.45

V

q 2.36

2.48

V

All Conditions

4.94 5.0 5.06

V

q 4.90

5.10

V

7

10

14

kΩ

5V ≤ VIN ≤ 25V

5V ≤ VIN ≤ 30V (LT1375HV/LT1376HV)

0.01 0.03 %/ V

0.01 0.03 %/V

q

0.5 1.5

µA

VSHDN = 1V (Notes 2, 8)

VSHDN = 1V, ∆I (VC) = ±10µA (Note 8)

200 400

1500 2000 2700 µMho

q 1100

3000 µMho

2

A/ V

VSHDN = 1V, VFB = 2.1V or VSENSE = 4.4V

VSHDN = 1V, VFB = 2.7V or VSENSE = 5.6V

Duty Cycle = 0

q 150 225 320

µA

2

mA

0.9

V

VSHDN = 1V

2.1

V

VC Open, VFB = 2.1V or VSENSE = 4.4V,

DC ≤ 50% q 1.50 2

3

A

DC = 80% q 1.35

3

A

ISW = 1.5A, VBOOST = VIN + 5V

0.3 0.4

Ω

q

0.5

Ω

VFB = 2.1V or VSENSE = 4.4V

90 93

%

– 40°C ≤ TJ ≤ 125°C

86 93

%

TJ = 150°C

85 93

%

VC Set to Give 50% Duty Cycle

– 25°C ≤ TJ ≤ 125°C

TJ ≤ – 25°C

460 500 540 kHz

440

560 kHz

440

570 kHz

5V ≤ VIN ≤ 25V

5V ≤ VIN ≤ 30V (LT1375HV/LT1376HV)

q

0.05 0.15 %/ V

q

0.05 0.15 %/V

∆f = 10kHz

q 0.8 1.0 1.3

V

q

5.0 5.5

V

ISW ≤ 1.5A

q

VBOOST = VIN + 5V

ISW = 500mA q

ISW = 1.5A q

VBIAS = 5V

q

VBIAS = 5V

q

VSHDN = 0V, VIN ≤ 25V, VSW = 0V, VC Open

q

3 3.5

V

12 22

mA

25 35

mA

0.9 1.4

mA

3.2 4.0

mA

15 50

µA

75

µA

VSHDN = 0V, VIN ≤ 30V, VSW = 0V, VC Open

(LT1375HV/LT1376HV)

20 75

µA

q

100

µA

VC Open

q 2.3 2.38 2.46

V

3

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