MIC2174C-1YMM datasheet(5/27 Pages) MICREL

Il numero della parte	MIC2174C-1YMM

Spiegazioni elettronici	Synchronous Buck Controller Featuring Adaptive On-Time Control 40V Input, 300kHz

PDF	27 Pages

Scroll/Zoom	100%

Produttore elettronici	MICREL [Micrel Semiconductor]

Homepage	http://www.micrel.com

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5 / 27 page

Micrel, Inc.

MIC2174/MIC2174C

September 2010

M9999-091310-C

Electrical Characteristics

(4)

VBST − VLX = 5V; TA = 25°C, unless noted. Bold values indicate −40°C ≤ TJ ≤ +125°C.

Parameter

Condition

Min.

Typ.

Max.

Units

Soft-Start

Soft-Start Period

Oscillator

MIC2174

0.225

0.3

0.375

Switching Frequency

MIC2174C

0.202

0.27

0.338

MHz

Measured at DH

(7)

Maximum Duty Cycle

MIC2174C

Minimum Duty Cycle

Measured at DH, VFB = 1V

FET Drives

DH, DL Output Low Voltage

ISINK = 10mA

0.1

DH, DL Output High Voltage

ISOURCE = 10mA

VIN-0.1V

VBST-0.1V

DH On-Resistance, High State

2.1

3.3

Ω

DH On-Resistance, Low State

1.8

3.3

Ω

DL On-Resistance, High State

1.8

3.3

Ω

DL On-Resistance, Low State

1.2

2.3

Ω

LX Leakage Current

VLX = 40V, VIN = 5.5V,VBST = 45.5V

µA

HSD Leakage Current

VLX = 40V, VIN = 5.5V,VBST = 45.5V

µA

Thermal Protection

Over-Temperature Shutdown

155

°C

Over-Temperature Shutdown

Hysteresis

°C

Shutdown Control

EN Logic Level Low

3V < VIN <5.5V

0.4

0.8

EN Logic Level High

3V < VIN <5.5V

0.9

1.2

EN Pull-Up Current

µA

Note:

The maximum duty cycle is limited by the fixed mandatory off time TOFF of typical 363ns.

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