LT1176 Просмотр технического описания (PDF) - Linear Technology

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LT1176

Step-Down Switching Regulator

Linear Technology 

LT1176/LT1176-5

ELECTRICAL CHARACTERISTICS The l 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

CONDITIONS

MIN TYP MAX

Switch ON Voltage (Note 2)

Switch OFF Leakage

Supply Current (Note 3)

Minimum Supply Voltage

ISW = 0.2A

l

ISW = 1A

l

VIN = 25V, VSW = 0

VIN = VMAX, VSW = 0 (Note 8)

VFB = 2.5V, VIN ≤ 35V

l

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

l

Normal Mode

l

Startup Mode (Note 4)

l

1.1

1.4

150

250

7.5

10

140.0 300

7.3

8.0

3.5

4.8

Switch Current Limit (Note 5)

Maximum Duty Cycle

ILIM Open

RLIM = 10k (Note 6)

RLIM = 7k (Note 6)

l 1.2

1.7

2.2

1.2

0.8

l 85

90

Switching Frequency

Switching Frequency Line Regulation

Error Amplifier Voltage Gain (Note 10)

VFB = 0V Through 2k (Note 5) (LT1176)

VSENSE = 0V (Note 5) (LT1176-5)

8V ≤ VIN ≤ VMAX (Note 8)

1V ≤ VC ≤ 4V

90

l 85

l

100

110

120

20

20

0.03

0.1

2000

Error Amplifier Transconductance (Note 10)

3700 5000 8000

Error Amplifier Source and Sink Current

Feedback Pin Bias Current (LT1176)

Source (VFB = 2V or VSENSE = 4V)

Sink (VFB = 2.5V or VSENSE = 5.5V)

VFB = VREF

100.0 140 225.0

0.7

1.0

1.6

l

0.5

2

Reference Voltage (LT1176)

Reference Voltage Tolerance (LT1176)

VC = 2V

VREF (Nominal) = 2.21V

All Conditions of Input Voltage, Output Voltage,

Temperature and Load Current

l 2.155 2.21 2.265

±0.5

±2

l

±1.0

±3

Sense Voltage (LT1176-5)

Sense Voltage Tolerance (LT1176-5)

VC = 2V

VOUT (Nominal) = 5V

All Conditions of Input Voltage,

Temperature and Load Current

l 4.85

5

5.15

±0.5

±2

l

±0.1

±3

Sense Pin Divider Resistance (LT1176-5)

3

5

8

Output Voltage Line Regulation

VC Voltage at 0% Duty Cycle

8V ≤ VIN ≤ VMAX (Note 8)

Overtemperature

l

0.005 0.02

1.5

l

–4.0

Multiplier Reference Voltage

24

Shutdown Pin Current

Shutdown Thresholds

VSHDN = 5V

VSHDN ≤ VTHRESHOLD (@ 2.5V)

Switch Duty Cycle = 0

Fully Shutdown

l

5

l

10

20

50

l 2.2

2.45

2.7

l 0.1

0.30

0.5

Status Window

As a Percent of Output Voltage

±4

±5

±6

Status High Level

ISTATUS = 10µA Sourcing

l 3.5

4.5

5.0

UNITS

V

V

µA

µA

mA

µA

V

V

A

A

A

%

kHz

kHz

kHz

kHz

%/V

V/V

µmho

µA

mA

µA

V

%

%

V

%

%

kΩ

%/V

V

mV/°C

V

µA

µA

V

V

%

V

11765fb

3

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