MIC28512 datasheet(4/34 Pages) MICROCHIP

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MIC28512

DS20005524A-page 4

 2016 Microchip Technology Inc.

TABLE 1-1:

ELECTRICAL CHARACTERISTICS

Electrical Characteristics:

VIN = 12V, 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)

4.6

—

V—

Quiescent Supply Current

—

0.4

0.75

VFB = 1.5V (MIC28512-1)

—0.7

1.5

VFB = 1.5V (MIC28512-2)

Shutdown Supply Current

—

0.1

µA

SW unconnected, VEN = 0V

VDD Supply

VDD Output Voltage

4.8

5.2

5.4

VVIN = 7V to 60V, IVDD = 10 mA

VDD UVLO Threshold

3.8

4.2

4.6

VVDD rising

VDD UVLO Hysteresis

—

400

—

Load Regulation at 40 mA

0.6

4.0

—

Reference

Feedback Reference Voltage

0.792

0.8

0.808

+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

450

680

800

kHz

VFREQ = VIN

—340

—

VFREQ = 50% x VIN

Maximum Duty Cycle

—

Minimum Duty Cycle

—

VFB > 0.8V

Minimum Off-Time

110

200

270

—

Internal MOSFET

High-Side NMOS

On-Resistance

—77

—

mΩ

—

Low-Side NMOS

On-Resistance

—43

—

Short-Circuit Protection

Current-Limit Threshold

–30

–14

VFB = 0.79V

Short-Circuit Threshold

–24

–7

VFB = 0V

Current-Limit Source Current

µA

VFB = 0.79V

Short-Circuit Source Current

VFB = 0V

Note 1:

Specification for packaged product only.

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