MIC2174 datasheet(4/24 Pages) MICREL

No de pièce	MIC2174

Description	300kHz, Synchronous Buck Controller 300kHz, Synchronous Buck Controller

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Fabricant	MICREL [Micrel Semiconductor]

Site Internet	http://www.micrel.com

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4 / 24 page

Micrel, Inc.

MIC2174

September 2009

4

M9999-090409-B

Parameter

Condition

Min

Typ

Max

Units

Oscillator

Switching Frequency

Measured in Test Mode

0.225

0.3

0.375

MHz

Maximum Duty Cycle

Measured at DH

(8)

87

%

Minimum Duty Cycle

Measured at DH

0

%

FET Drives

DH, DL Output Low Voltage

ISINK = 10mA

0.1

V

DH, DL Output High Voltage

ISOURCE = 10mA

VIN-0.1V

or

VBST-0.1V

V

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

55

µA

HSD Leakage Current

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

21

µA

Thermal Protection

Over-temperature Shutdown

155

°C

Over-temperature Shutdown

Hysteresis

10

°C

Shutdown Control

En Logic Level Low

3V < VIN <5.5V

0.4

0.8

V

En Logic Level High

3V < VIN <5.5V

0.9

1.2

V

En Pull-up Current

50

µA

Note:

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

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