MIC2125 datasheet(4/34 Pages) MICROCHIP

4 / 34 page

MIC2125/6

DS20005459B-page 4

 2015 Microchip Technology Inc.

TABLE 1-1:

ELECTRICAL CHARACTERISTICS

Electrical Characteristics:

VIN = 12V, VOUT = 1.2V, 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 (VIN)

(Note 2)

4.5

—

5.5

VVDD = VIN

4.5

—

Quiescent Supply Current

(MIC2125)

—340

750

µA

VFB = 1.5V

Quiescent Supply Current

(MIC2126)

—1.1

VFB = 1.5V

Shutdown Supply Current

—

0.1

µA

SW unconnected, VEN = 0V

VDD Supply

VDD Output Voltage

4.8

5.2

5.4

VVIN = 7V to 28V, IDD = 10 mA

VDD UVLO Threshold

3.7

4.2

4.5

VDD rising

VDD UVLO Hysteresis

—

400

—

Load Regulation

0.6

3.6

IDD = 0 to 40 mA

Reference

Feedback Reference Voltage

0.597

0.6

0.603

TJ = 25°C (±0.5%)

0.594

0.6

0.606

–40°C ≤ TJ ≤ +125°C (±1%)

FB Bias Current

—

0.01

0.5

µA

VFB = 0.6V

Enable Control

EN Logic Level High

1.6

——

—

EN Logic Level Low

—

0.6

—

EN Hysteresis

—

120

—

EN Bias Current

—

µA

VEN = 12V

Oscillator

Switching Frequency

—

750

—

kHz

VFREQ = VIN

—375

—

VFREQ = 50% x VIN

Maximum Duty Cycle

—

Minimum Duty Cycle

—

VFB > 0.6V

Minimum On-Time

—

100

—

Minimum Off-Time

150

220

300

—

Soft-Start

Soft-Start Time

—

Short-Circuit Protection and OVP

Current-Limit Comparator

Offset

–15

–4

VFB = 0.6V

Current-Limit Source Current

µA

VFB = 0.6V

Note 1:

Specification for packaged product only.

The application is fully functional at low VDD (supply of the control section) if the external MOSFETs have

low voltage VTH.

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