MIC26950YJL EV Micrel, MIC26950YJL EV Datasheet

MIC26950YJL EV

Manufacturer Part Number

MIC26950YJL EV

Description

Power Management IC Development Tools 26V/12A Step Down DC-DC Converter - Evaluation Board

Manufacturer

Micrel

Type

DC/DC Converters, Regulators & Controllersr

Datasheet

1.MIC26950YJL_EV.pdf (7 pages)

Specifications of MIC26950YJL EV

Product

Evaluation Boards

Tool Is For Evaluation Of

MIC26950

Input Voltage

4.5 V to 26 V

Output Voltage

0.9 V, 1 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V

Description/function

Evaluation Board

Maximum Operating Temperature

+ 125 C

Minimum Operating Temperature

- 40 C

Output Current

12 A

For Use With

MIC26950

Current page: 1 of 7
Download datasheet (261Kb)

General Description

The MIC26950 DC/DC regulator operates over an input

supply range of 4.5V to 26V and provides a regulated output

at up to 12A of output current. The output voltage is

adjustable down to 0.8V with a typical accuracy of ±1% and

the device operates at a switching frequency of 300kHz. The

switching frequency remains fairly constant with changes in

input voltage and output load.

Micrel’s Hyper Speed Control

fast transient response while reducing the output capacitance

and also makes (High V

The MIC26950 utilizes an adaptive t

architecture. An undervoltage lockout feature is provided to

ensure proper operation under power-sag conditions. An

internal soft-start feature is provided to reduce the inrush

current. Foldback current limit, “hiccup” mode short-circuit

protection, and thermal shutdown ensure protection of the IC

during fault conditions.

Note: This evaluation board is for 12A applications.

Datasheet and supporting documentation can be found on

Micrel’s web site at: www.micrel.com.

Requirements

The MIC26950 evaluation board requires two power

supplies: one to provide V

The V

3.0V with more than 12A capability. The V

must be greater than 4.5V. The on-board V

using an NPN transistor, provides V

output load can either be an active or passive load.

Precautions

The evaluation board does not have reverse polarity

protection. Applying a negative voltage to the V

may damage the device. In addition, the maximum V

operating voltage of the MIC26950 evaluation board is

26V. Exceeding 26V on V

could damage the device.

Hyper Speed Control is a trademark of Micrel, Inc.

MLF and MicroLead Frame are registered trademarks of Amkor Technology, Inc.

September 2010

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

power supply must be able to deliver greater than

)/(Low V

and the other to provide V

or exceeding 5.5V on V

architecture allows for ultra-

OUT

) operation possible.

power supply. The

ripple control

power supply

regulator,

terminal

If V

external V

powered up at the same time or after V

start function correctly.

Getting Started

1. Connect an external supply to the V

the desired input voltage to the V

the evaluation board, paying careful attention to polarity

and supply voltage. An ammeter may be placed between

the input supply and the V

board. Ensure that the supply voltage is monitored at the

can reduce the voltage supplied to the input.

2. Connect the load to the V

The load can be either passive (resistive) or active (as in

an electronic load). An ammeter can be placed between

the load and the V

voltage is monitored at the V

to 0.9V, 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, or 5.0V by a

jumper. If a different voltage is needed, it can be adjusted

by changing the feedback resistors. See “Output Voltage”

section.

3. Enable the MIC26950. The EN pin is provided on the

evaluation board. The output of the MIC26950 turns on

when V

MIC26950 may be turned off by shorting the EN pin to

ground. An connection on the board provides easy access

to the enable pin.

Output Voltage

The output voltage on the MIC26950 evaluation board is

adjustable. It is set by adjusting the feedback resistors (R4

and one of R5, R6, R7, R8, R9, R10, R11, or R12) and

can be calculated as follows as an example:

where V

terminal. The ammeter and/or power lead resistance

MIC26950 Evaluation Board

Synchronous DC/DC Buck Regulator

is not powered from the on-board V

26V/12A Hyper Speed Control™

REF

exceeds the UVLO threshold. The output of the

= 0.8V.

power supply is required and must be

SuperSwitcher II

OUT

terminal. Ensure that the output

REF

OUT

terminal to the evaluation

terminal. V

and ground terminals.

and ground terminals of

http://www.micrel.com

)

to make the soft-

terminal. Apply

OUT

M9999-092910-A

regulator, an

can be set

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MIC26950YJL EV Summary of contents

Page 1

... Hyper Speed Control is a trademark of Micrel, Inc. MLF and MicroLead Frame are registered trademarks of Amkor Technology, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • September 2010 MIC26950 Evaluation Board ...

Page 2

... V OUT Ordering Information Part Number Description MIC26950YJL IC MIC26950YJL EV Evaluation Board Evaluation Board Schematic September 2010 The output voltage should not be set to exceed 5V due to the 6.3V rating of the output capacitor output voltage greater than 5V is desired, the output capacitor must be replaced with another capacitor that has a higher voltage rating ...

Page 3

... Micrel, Inc. Bill of Materials Item Part Number C1 B41125A7227M 12105C475KAZ2A C2, C3 GRM32ER71H475KA88L C4, C5 Open 06035C104KAT2A C6, C7, C10 GRM188R71H104KA93D C1608X7R1H104K 0805ZC225MAT2A C8, C9 GRM21BR71A225KA01L C2012X7R1A225K 06035C102KAT2A C11 GRM188R71H102KA01D C1608X7R1H102K 06035C223KAZ2A C12 GRM188R71H223K C1608X7R1H223K 12106D107MAT2A C13 GRM32ER60J107ME20L C14 Open C15 6SEPC560MX SD103AWS-7 D1 SD103AWS D2 CMDZ5L6 L1 HCF1305-2R2-R ...

Page 4

... EPCOS: www.epcos.com. 2. AVX: www.avx.com. 3. Murata: www.murata.com. 4. TDK: www.tdk.com. 5. SANYO: www.sanyo.com. 6. Diode Inc.: www.diodes.com. 7. Vishay: www.vishay.com. 8. Central Semi: www.centralsemi.com. 9. Cooper Bussmann: www.cooperbussmann.com. 10. Micrel, Inc.: www.micrel.com. September 2010 Manufacturer Description (7) Vishay Dale 4.75kΩ Resistor, Size 0603, 1% (7) Vishay Dale 3.24kΩ Resistor, Size 0603, 1% ...

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MIC26950YJL EV Micrel, MIC26950YJL EV Datasheet

MIC26950YJL EV

Specifications of MIC26950YJL EV

Related parts for MIC26950YJL EV

MIC26950YJL EV Summary of contents

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