MP2355 datasheet(4/10 Pages) MPS

4 / 10 page

MP2355 – 3A, 23V, 380KHz STEP-DOWN CONVERTER

MP2355 Rev. 1.4

www.MonolithicPower.com

1/6/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

Circuit of Figure 2, VIN = 12V, VO = 3.3V, L1 = 15µH, C1 = 10µF, C2 = 22µF, TA = +25°C, unless

otherwise noted.

VO, AC

200mV/div.

1A/div.

ILOAD

1A/div.

MP2355-TPC06

Load Transient

VOUT

2V/div.

2A/div.

VOUT

2V/div.

2A/div.

MP2355-TPC07

Short Circuit Protection

MP2355-TPC08

Short Circuit Recovery

PIN FUNCTIONS

Pin #

Name

Description

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

GND to set the soft-start period. A 0.1µF capacitor sets the soft-start period to 10ms. To

disable the soft-start feature, leave SS unconnected.

BST

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

MOSFET switch. Connect a 10nF or greater capacitor from LX to BST to power the high

side switch.

VIN

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

Drive VIN with a 4.75V to 23V power source. Bypass VIN to GND with a suitably large

capacitor to eliminate noise on the input to the IC. See Input Capacitor

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

Connect the output LC filter from LX to the output load. Note that a capacitor is required

from LX to BST to power the high-side switch.

GND

Ground. (Note: Connect the exposed pad on backside to Pin 5.)

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

resistive voltage divider from the output voltage. The feedback threshold is 1.222V. See

Setting the Output Voltage

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

RUN

Enable/UVLO. A voltage greater than 2.71V enables operation. For complete low current

shutdown the EN pin voltage needs to be less than 900mV.

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