MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER

INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE

MP2303 Rev. 0.91

www.MonolithicPower.com

3

3/10/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

TM

ELECTRICAL CHARACTERISTICS

Parameter

Symbol Condition

Min

Typ

(4)

Max

Units

EN Shutdown Threshold Voltage

Hysteresis

220

mV

2.2

2.5

2.7

V

EN Lockout Threshold Voltage

–40

2.1

2.8

V

EN Lockout Hysteresis

210

mV

3.8

4.05

4.30

V

Input Under Voltage Lockout

Threshold

UVLO

–40

3.5

4.70

V

Input Under Voltage Lockout

Threshold Hysterisis

210

mV

Soft-Start Current

6

µA

Thermal Shutdown

160

°C

Note:

4) 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.

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 0.01µF 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 28V power source. Bypass IN to GND with a suitably large capacitor

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

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 Exposed Pad to Pin 4).

5

FB

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

resistive voltage divider from the output voltage. The feedback reference voltage is 0.8V. See

Setting the Output Voltage.

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

Components.

7

EN

Enable Input. EN is a digital input that turns the regulator on or off. Drive EN higher than 2.7V

to turn on the regulator, drive it lower than 1.1V to turn it off. Pull up to the IN pin with 100kΩ

resistor for automatic startup.

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. See Soft-Start Capacitor.