MP28372DF datasheet(3/12 Pages) MPS

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MP28372 — DUAL 1.5A, 23V, 1.4MHz STEP-DOWN CONVERTER

MP28372 Rev. 1.4

www.MonolithicPower.com

12/10/2007

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

ELECTRICAL CHARACTERISTICS

VIN = 12V, TA = +25°C, unless otherwise noted.

Parameter

Symbol Condition

Min

Typ

Max

Units

Feedback Voltage

VFB

4.75V

≤ VIN ≤ 23V

0.901

0.920

0.939

Upper Switch-On Resistance RDS(ON)1

0.18

Ω

Lower Switch-On Resistance RDS(ON)2

Ω

Upper Switch Leakage

VEN = 0V, VSW = 0V

µA

Current Limit

(4)

2.5

3.0

Current Limit Gain

Output Current to Comp Pin

Voltage

GCS

1.95

A/V

Error Amplifier Voltage Gain

AVEA

400

V/V

Error Amplifier

Transconductance

GEA

ΔIC = ±10 μA

630

930

1230

μA/V

Oscillator Frequency

fOSC

1.4

MHz

Short Circuit Frequency

fSC

VFB = 0V

210

KHz

Soft-Start Pin Equivalent

Output Resistance

kΩ

EN Shutdown Threshold

Voltage

VEN

ICC > 100μA

0.7

1.0

1.3

Enable Pull-Up Current

IEN

1.0

μA

EN UVLO Threshold Rising

VUVLO

VEN Rising

2.37

2.50

2.62

EN UVLO Threshold

Hysteresis

210

Supply Current (Shutdown)

IOFF

VEN ≤ 0.4V

μA

Supply Current (Quiescent)

ION

VEN ≥ 3V

2.4

2.8

Thermal Shutdown

DMAX

160

°C

Maximum Duty Cycle

VFB = 0.8V

Minimum On Time

tON

100

Note:

4) Equivalent output current = 1.5A ≥ 50% Duty Cycle

2.0A ≤ 50% Duty Cycle

Assumes ripple current = 30% of load current.

Slope compensation changes current limit above 40% duty cycle.

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