MP2363 – 3A, 27V, 365KHz STEP-DOWN CONVERTER

MP2363 Rev. 1.0

www.MonolithicPower.com

3

6/15/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

1

BS

High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET

switch. Connect a 10nF or greater capacitor from SW to BS to power the high-side switch.

2

IN

Power Input. IN supplies the power to the IC, as well as the step-down converter switches.

Drive IN with a 4.75V to 27V power source. Bypass IN to GND with a suitably large capacitor

to eliminate noise on the input to the IC. See Input Capacitor section of Application

Information.

3

SW

Power Switching Output. SW is the switching node that supplies power to the output. Connect

the output LC filter from SW to the output load. Note that a capacitor is required from SW to BS

to power the high-side switch.

4

GND

Ground. Connect the exposed pad on backside to Pin 4.

5

FB

Feedback Input. FB senses the output voltage to regulate said voltage. Drive FB with a

resistive voltage divider from the output voltage. The feedback threshold is 0.92V. See Setting

the Output Voltage

section of Application Information.

6

COMP

Compensation Node. COMP is used to compensate the regulation control loop. Connect a

series RC network from COMP to GND to compensate the regulation control loop. In some

cases, an additional capacitor from COMP to GND is required. See Compensation section of

Application Information.

7

EN

Enable Input. EN is a digital input that turns the regulator on or off. Drive EN higher than 2.71V

to turn on the regulator, lower than 0.9V to turn it off. For automatic startup, leave EN

unconnected.

8

SS

Soft Start Control Input. SS controls the soft start period. Connect a capacitor from SS to GND

to set the soft-start period. Soft-start cap is always recommended to eliminate the start-up

inrush current and for a smooth start-up waveform.

TYPICAL PERFORMANCE CHARACTERISTICS

Limit Current vs

Duty Cycle

95

90

85

80

75

70

65

60

55

50

100

95

90

85

80

75

70

65

60

55

50

LOAD CURRENT (A)

LOAD CURRENT (A)

Efficiency Curve vs

Load Current

0

0.5 1.0 1.5 2.0 2.5 3.0 3.5

Efficiency Curve vs

Load Current

0

0.5 1.0 1.5 2.0 2.5 3.0 3.5

7.0

6.5

6.0

5.5

5.0

4.5

4.0

0

0.2

0.1

0.3 0.4

0.7

0.6

0.5

DUTY CYCLE (%)