MIC2174-1YMM 3A EV Micrel, MIC2174-1YMM 3A EV Datasheet

MIC2174-1YMM 3A EV

Manufacturer Part Number

MIC2174-1YMM 3A EV

Description

Power Management IC Development Tools 300kHz Synch Current Mode PWM Controller - Evaluation Board

Manufacturer

Micrel

Type

PWM Controllersr

Datasheet

1.MIC2174-1YMM_3A_EV.pdf (7 pages)

Specifications of MIC2174-1YMM 3A EV

Product

Evaluation Boards

Tool Is For Evaluation Of

MIC2174

Input Voltage

3 V to 40 V

Output Voltage

1.8 V

Description/function

Evaluation Board

Maximum Operating Temperature

+ 125 C

Minimum Operating Temperature

- 40 C

Output Current

3 A

For Use With

MIC2174

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Download datasheet (198Kb)

General Description

MIC2174, a member of the new Hyper Speed Control

family of buck controllers introduced by Micrel, is a

synchronous, adaptive on-time buck controller. This

controller is targeted for cost sensitive applications

requiring high performance. The MIC2174 operates over

an input supply range of 3V to 40V, and is independent of

the IC supply voltage.

Data sheets support documentation can be found on

Micrel’s web site at www.micrel.com.

Requirements

The MIC2174 evaluation board requires two power

supplies: one to provide VIN (connect to HSD pin of

MIC2174), and the other to provide VDD (connect to IN pin

of the MIC2174) for the control circuitry. The VIN power

supply should be able to deliver greater than 3.0V at over

3A. The VDD power source, which is recommended to be

5.0V typical, should be able to deliver greater than 3.0V.

The typical VDD current is a few milliamps. An external

20mA minimum power supply is recommended for VDD.

Precautions

The evaluation board does not have reverse polarity

protection. Applying a negative voltage to the VIN or VDD

terminal may damage the device. In addition, the

maximum

evaluation board is 40V, and the maximum VDD operation

voltage is 5.5V. Exceeding 42V on VIN or exceeding 6V on

VDD could damage the device.

An external VDD power supply is required and it should be

turned on no earlier than VIN power supply to make sure

the soft-start behavior properly.

Getting Started

1. Connect an external supply to VIN terminal. Apply

desired input voltage to the VIN (J1) and ground (J4)

terminals of the evaluation board, paying careful attention

to polarity and supply voltage (3.0V<VIN<40V). An

ammeter may be placed between the input supply and the

Hyper Speed Control is a trademark of Micrel, Inc.

December 2009

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

VIN

operating

voltage

the

MIC2174

VIN terminal to the evaluation board. Ensure the supply

voltage is monitored at the VIN terminal. The ammeter

and/or power lead resistance can reduce the voltage

supplied to the input.

2. Connect an external supply to VDD terminal. Apply

desired input voltage to the VDD (J6) and ground (J5)

terminals of the evaluation board, paying careful attention

to polarity and supply voltage (3.0V<VDD<5.5V). The VDD

power supply should be turned on no earlier than VIN

power supply. The recommended voltage for VIN is 5V.

3. Connect the load to the VOUT and ground terminals.

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

an electronic load). An ammeter can be placed between

the load and the VOUT (J2) terminal. Ensure the output

voltage is monitored at the VOUT terminal. The default

VOUT is set to 1.8V. This can be adjusted by changing the

feedback resistors. See “Output Voltage.”

4. Enable the MIC2174. The enable pin is floating by

default. The output of the MIC2174 turns on when VDD

exceeds the UVLO threshold. The output of the MIC2174

may be turned off by shorting the enable pin to ground or

bringing the enable pin below the enable threshold. An

external connection on the board provides easy access to

the enable pin.

Output Voltage

The output voltages on the MIC2174 evaluation board are

adjustable. The output voltage is controlled by the

feedback resistors (R4 and R6) and can be calculated as

follows:

where V

The evaluation board is preset at a 1.8V output, but can

easily be modified by removing R6 and replacing it with the

value that yields the desired output voltage.

For V

MIC2174 3A Evaluation Board

Buck Controller Featuring Adaptive On-

REF

Constant Frequency, Synchronous

REF

= 0.8V, this reduces to:

Hyper Speed Control

= 0.8V.

OUT

Time Control

OUT

REF

( ×

−

REF

Family

)

M9999-122309-A

Related parts for MIC2174-1YMM 3A EV

MIC2174-1YMM 3A EV Summary of contents

Page 1

... Requirements The MIC2174 evaluation board requires two power supplies: one to provide VIN (connect to HSD pin of MIC2174), and the other to provide VDD (connect to IN pin of the MIC2174) for the control circuitry. The VIN power supply should be able to deliver greater than 3.0V at over 3A. The VDD power source, which is recommended ...

Page 2

... When the output voltage greater than 5V is desired, the output capacitor should be replaced with higher voltage rating. December 2009 . 8 V Ordering Information . Part Number MIC2174-1YMM MIC2174-1YMM MIC2164 5A Evaluation Board Description Package IC 10-pin MSOP Evaluation Board 10-pin MSOP M9999-122309-A ...

Page 3

... AVX 1nF Ceramic Capacitor, X7R, Size 0603, 50V Murata TDK AVX 10nF Ceramic Capacitor, X7R, Size 0603, 50V Murata TDK (5) Diodes Inc Small Signal Schottky Diode (6) Vishay (7) Sumida 10µH Inductor, 3.8A Saturation Current 3 MIC2174 3A Evaluation Board Qty M9999-122309-A ...

Page 4

... Resistor, Size 0603, 1% Vishay Dale 19.6kΩ Resistor, Size 0603, 1% Vishay Dale 10kΩ Resistor, Size 0603, 1% Vishay Dale 20Ω Resistor, Size 0603, 1% Vishay Dale 8.06kΩ Resistor, Size 0603, 1% (9) Micrel. Inc. 300kHz Buck Controller 4 MIC2174 3A Evaluation Board M9999-122309-A ...

Page 5

... Micrel, Inc. Printed Circuit Board Layouts December 2009 Figure 1a. Top Layer Figure 1b. Bottom Layer 5 MIC2174 3A Evaluation Board M9999-122309-A ...

Page 6

... Micrel, Inc. December 2009 Figure 1c. Mid Layer 1 (GND Plane) Figure 1d. Mid Layer 2 6 MIC2174 3A Evaluation Board M9999-122309-A ...

Page 7

... Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully December 2009 indemnify Micrel for any damages resulting from such use or sale. © 2009 Micrel, Incorporated. 7 MIC2174 3A Evaluation Board M9999-122309-A ...

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