MIC28303 datasheet(4/38 Pages) MICROCHIP

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MIC28303

DS20005464A-page 4

 2016 Microchip Technology Inc.

TABLE 1-1:

ELECTRICAL CHARACTERISTICS

Electrical Characteristics:

PVIN = VIN = 12V, VOUT = 5V, VBST – VSW = 5V; TA = 25°C, unless noted. Bold values

indicate –40°C ≤ TJ ≤ +125°C. (Note 1).

Parameters

Min.

Typ.

Max.

Units

Conditions

Power Supply Input

Input Voltage Range (PVIN,

VIN)

4.5

—

V—

Controller Supply Current

—

0.4

0.75

Current into Pin 60; VFB = 1.5V

(MIC28303-1)

—2.1

3.0

Current into Pin 60; VFB = 1.5V

(MIC28303-2)

—0.1

µA

Current into Pin 60; VEN = 0V

Operating Current

—

0.7

—

IOUT = 0A (MIC28303-1)

—27

—

IOUT = 0A (MIC28303-2)

Shutdown Supply Current

—

4.0

—

µA

PVIN = VIN = 12V, VEN = 0V

PVDD Supply

PVDD Output Voltage

4.8

5.2

5.4

VVIN = 7V to 50V, IPVDD = 10mA

PVDD UVLO Threshold

3.8

4.2

4.7

PVDD rising

PVDD UVLO Hysteresis

—

400

—

Load Regulation

0.6

2.0

3.6

IPVDD = 0 to 40mA

Reference

Feedback Reference Voltage

0.792

0.8

0.808

TJ = 25°C (±1.0%)

0.784

0.8

0.816

–40°C ≤ TJ ≤ 125°C (±2%)

FB Bias Current

—

500

VFB = 0.8V

Enable Control

EN Logic Level High

1.8

——

—

EN Logic Level Low

—

0.6

—

EN Hysteresis

—

200

—

EN Bias Current

—

µA

VEN = 12V

Oscillator

Switching Frequency

400

600

750

kHz

FREQ pin = open

—300

—

RFREQ=100kΩ(FREQpin-to-GND)

Maximum Duty Cycle

—

Minimum Duty Cycle

—

VFB > 0.8V

Minimum Off-Time

140

200

260

—

Soft-Start

Soft-Start Time

—

Short-Circuit Protection

Current Limit Protection (VCL)

–30

–14

VFB = 0.79V

Short-Circuit Threshold

–23

–7

VFB = 0V

Note 1:

Specification for packaged product only.

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