MP2309 查看數據表（PDF） - Monolithic Power Systems

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MP2309

1A, 23V, 340KHz Synchronous Rectified Step-Down Converter

Monolithic Power Systems 

TM

MP2309 – 1A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER

ELECTRICAL CHARACTERISTICS (continued)

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

Parameter

Symbol Condition

Input Under Voltage Lockout

Threshold

VIN Rising

Input Under Voltage Lockout

Threshold Hysteresis

Soft-Start Current

Soft-Start Period

Thermal Shutdown (4)

VSS = 0V

CSS = 0.1µF

Note:

4) Guaranteed by design, not tested.

Min

Typ

Max Units

3.80 4.10 4.40

V

210

mV

6

µA

15

ms

160

°C

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.

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

2

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

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

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

3

SW 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.

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

5

FB resistive voltage divider from the output voltage. The feedback threshold is 0.923V. See

Setting the Output Voltage.

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

6

COMP

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 high to turn on

the regulator, drive it low to turn it off. Pull up with 100kΩ resistor for automatic startup.

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

8

SS to set the soft-start period. A 0.1µF capacitor sets the soft-start period to 15ms. To disable the

soft-start feature, leave SS unconnected.

MP2309 Rev. 1.4

www.MonolithicPower.com

3

3/13/2006

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© 2006 MPS. All Rights Reserved.

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