MP29373 — DUAL 1.5A, 23V, 1.4MHz STEP-DOWN CONVERTER

MP29373 Rev. 1.1

www.MonolithicPower.com

3

12/13/2007

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2007 MPS. All Rights Reserved.

ELECTRICAL CHARACTERISTICS

Parameter

Symbol Condition

Min

Typ

Max

Units

Feedback Voltage

4.75V

0.892

0.920

0.948

V

0.18

Ω

10

Ω

Upper Switch Leakage

10

µA

Current Limit

(4)

2.5

3.0

A

Current Limit Gain

Output Current to Comp Pin

Voltage

1.95

A/V

Error Amplifier Voltage Gain

400

V/V

Error Amplifier

Transconductance

630

930

1230

μA/V

Oscillator Frequency

1.4

MHz

Short Circuit Frequency

210

KHz

Soft-Start Pin Equivalent

Output Resistance

9

kΩ

EN Shutdown Threshold

Voltage

0.7

1.0

1.3

V

Enable Pull-Up Current

1.0

μA

EN UVLO Threshold Rising

2.37

2.50

2.62

V

EN UVLO Threshold

Hysteresis

210

mV

Supply Current (Shutdown)

40

70

μA

Supply Current (Quiescent)

2.4

2.8

mA

Thermal Shutdown

160

°C

Maximum Duty Cycle

70

%

Minimum On Time

100

ns

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.