EV2106DQ/DK-00A Просмотр технического описания (PDF) - Monolithic Power Systems

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EV2106DQ/DK-00A

1.5A, 15V, 800KHz Synchronous Buck Converter

Monolithic Power Systems 

TM

MP2106 – 1.5A, 15V, 800KHz SYNCHRONOUS BUCK CONVERTER

ELECTRICAL CHARACTERISTICS (continued)

VIN = 5.0V, TA = +25°C, unless otherwise noted.

Parameter

Symbol Condition

Error Amplifier

Voltage Gain

Transconductance

COMP Maximum Output Current

AVEA

GEA

FB Regulation Voltage

FB Input Bias Current

Soft-Start

VFB

IFB VFB = 0.895V

Soft-Start Current

ISS

Output Switch On-Resistance

Switch On Resistance

Synchronous Rectifier On Resistance

Switch Current Limit (Source)

VIN = 5V

VIN = 3V

VIN = 5V

VIN = 3V

Synchronous Rectifier Current Limit

(Sink)

Thermal Shutdown

Min

Typ

Max Units

400

V/V

300

µA/V

±30

µA

875

895

915

mV

–100

nA

2

µA

255

mΩ

315

mΩ

210

mΩ

255

mΩ

2.5

A

350

mA

160

°C

PIN FUNCTIONS

Pin #

1

2

3

4

5

6

7

8

9

10

Name Description

Soft-Start Input. Place a capacitor from SS to SGND to set the soft-start period. The MP2106

SS sources 2µA from SS to the soft-start capacitor at startup. As the SS voltage rises, the

feedback threshold voltage increases to limit inrush current during startup.

FB

Feedback Input. FB is the inverting input of the internal error amplifier. Connect a resistive

voltage divider from the output voltage to FB to set the output voltage value.

COMP

Compensation Node. COMP is the output of the error amplifier. Connect a series RC network

to compensate the regulation control loop.

VREF

Internal 2.4V Regulator Bypass. Connect a 10nF capacitor between VREF and SGND to

bypass the internal regulator. Do not apply any load to VREF.

RUN

On/Off Control Input. Drive RUN high to turn on the MP2106; low to turn it off. For automatic

startup, connect RUN to VIN via a pullup resistor.

BST

Power Switch Boost. BST powers the gate of the high-side N-Channel power MOSFET switch.

Connect a 10nF or greater capacitor between BST and LX.

Internal Power Input. VIN supplies the power to the MP2106 through the internal LDO

VIN regulator. Bypass VIN to PGND with a 10µF or greater capacitor. Connect VIN to the input

source voltage.

LX

Output Switching Node. LX is the source of the high-side N-Channel switch and the drain of the

low-side N-Channel switch. Connect the output LC filter between LX and the output.

PGND

Power Ground. PGND is the source of the N-Channel MOSFET synchronous rectifier. Connect

PGND to SGND as close to the MP2106 as possible.

SGND Signal Ground.

MP2106 Rev. 1.6

www.MonolithicPower.com

3

2/22/2006

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© 2006 MPS. All Rights Reserved.

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