Microchip MIC28304-1 Manual

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Side 1/18

MIC28304 Evaluation Board

70V 3A Power Module

Hyper Speed Control™ Family

General Description

The Micrel MIC28304 is synchronous step -down regulator

module, featuring a unique adaptive ON time control -

architecture. The module incorporates a DC- -to DC

controller, power MOSFETs, bootstrap diode, bootstrap

capacitor, and an inductor in a single package. The

MIC28304 operates over an input supply range of 4.5V to

70V and can be used to supply up to 3A of output current.

The output voltage is adjustable down to 0.8V with a

guaranteed accuracy of ±1%. The device operates with a

programmable switching frequency from 200kHz to

600kHz.

The MIC28304-1 has the HyperLight Load® architecture,

so it can operate in pulse skipping mode at light load.

However, it operates in fixed frequency CCM mode from

medium load to heavy load. The MIC28304-2 has Hyper

Speed Control which operates in fixed ™ architecture,

frequency CCM mode under all load conditions.

The basic parameters of the evaluation board are:

• Input: 7V to 70V

• Output: 0.8V to 5V at 3A(1)

• 600kHz Switching Frequency (Adjustable 200kHz

to 600kHz)

Note:

1. Refer to temperature curves shown in the MIC28304 0.8V to 5V/3A

Evaluation Board Typical Characteristics section.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Requirements

The MIC28304-1 and MIC28304-2 evaluation board

requires only a single power supply with at least 10A

current capability. o external linear regulator is required N

to power the internal biasing of the IC because the

MIC28304 has internal PVDD LDO In the applications .

with VIN < +5.5V, PVDD should be tied to VIN to bypass

the internal linear regulator. The output load can either be

a passive or an active load.

Precautions

The MIC28304 evaluation board does not have reverse

polarity protection. Applying a negative voltage to the VIN

and GND terminals may damage the device. The

maximum VIN of the board is rated at 70V. Exceeding 70V

on the VIN could damage the device.

Getting Started

1. VIN Supply

Connect a supply to the VIN and GND terminals,

paying careful attention to the polarity and the supply

range (7V < VIN < 70V). Monitor with a current IIN

meter and input voltage at VIN and GND monitor

terminals with a voltmeter. Do not apply power until

step 4.

2. Connect Load and Monitor Output

Connect a load to the VOUT and GND terminals. The

load can be either a passive (resistive) or an active (as

in an electronic load) type. A current meter may be

placed between the VOUT terminal and load to

monitor the output current. Ensure the output voltage

is monitored at the VOUT terminal.

3. Enable Input

The EN pin has an on board 100kΩ pull-up resistor

(R16) to VIN, which allows the output to be turned on

when PVDD exceeds its UVLO threshold. An EN

connector is provided on the evaluation board for

users to easily access the enable feature. Applying an

external logic signal on the EN pin to pull it low or

using a jumper to short the EN pin to GND will shut off

the output of the 28304 evaluation boardMIC .

4. Turn Power

Turn on the VIN supply and verify that the output

voltage is regulated to 5V.

Ordering Information

Part Number Description

MIC28304- 1 5V EV MIC28304 Evaluation -1

Board up to 5V Output

MIC28304- 2 5V EV MIC28304 2 Evaluation -

Board up to 5V Output

MIC28304-1 12V EV MIC28304 Evaluation -1

Board 12V Output

MIC28304-2 12V EV MIC28304 Evaluation -2

Board 12V Output

Hyper LightLoad is a registered trademark and Hyper Speed Control trademark of Micrel, Inc. is a

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

April 29, 2014 Revision 1.0

Micrel, Inc.

MIC28304 Evaluation Board

Features

Feedback Resistors

The output voltage on the MIC28304 evaluation board,

which is preset to 5.0V, is determined by the feedback

divider:











+×=

BOTTOM

REFOUT R

1VV

Eq. 1

where VREF = 0.8V, and RBOTTOM is one of R10, or R11,

which corresponds to 3.3V, 5V. Leaving the R BOTTOM open

gives a 0.8V output voltage. All other voltages not listed

above can be set by modifying RBOTTOM value according to:

REFOUT

REF

BOTTOM VV

VR1

R−

Eq. 2

Note that the output voltage should not be set to exceed

5V due to the 6.3V voltage rating on the output capacitors.

For higher output voltage, use the Ordering Information

table. Table 1 gives the typical values of some of the

components, for details refer to Bill of Material table.

Table 1. Typical Values of Some Components

VOUT VIN

(Rinj)

(Top Feedback Resistor)

R11

(Bottom Feedback Resistor)

C10

(Cinj)

C12

(Cff) COUT

0.9V 5V to 70V 16.5kΩ 10kΩ 80.6kΩ 0.1µF 2.2nF 47 µF /6.3V

or 2 x 22µF

1.2V 5V to 70V 16.5kΩ 10kΩ 20kΩ 0.1µF 2.2nF 47 µF /6.3V

or 2 x 22µF

1.8V 5V to 70V 16.5kΩ 10kΩ 8.06kΩ 0.1µF 2.2nF 47 µF /6.3V

or 2 x 22µF

2.5V 5V to 70V 16.5kΩ 10kΩ 4.75kΩ 0.1µF 2.2nF 47 µF /6.3V

or 2 x 22µF

3.3V 5V to 70V 16.5kΩ 10kΩ 3.24kΩ 0.1µF 2.2nF 47 µF /6.3V

or 2 x 22µF

5V 0.1µF 7V to 70V 16.5kΩ 10kΩ 1.9kΩ 2.2nF 47 µF/6.3V

or 2 x 22µF

12V 715 0.1µF 18V to 70V 23.2kΩ 10kΩ Ω 2.2nF 47 µF/16V

or 2 x 22µF

April 29 2 , 2014 Revision 1.0

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MIC28304-1

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