MIC23250-C4YMT EV Micrel, MIC23250-C4YMT EV Datasheet

MIC23250-C4YMT EV

Manufacturer Part Number

MIC23250-C4YMT EV

Description

Power Management IC Development Tools High Efficiency Dual 400mA Synchronous Buck Switcher - Evaluation Board

Manufacturer

Micrel

Type

DC/DC Converters, Regulators & Controllersr

Datasheet

1.MIC23250-GFHYMT_EV.pdf (8 pages)

Specifications of MIC23250-C4YMT EV

Product

Evaluation Boards

Tool Is For Evaluation Of

MIC23250

Input Voltage

2.7 V to 5.5 V

Output Voltage

1 V, 1.2 V

Description/function

Evaluation Board

Maximum Operating Temperature

+ 125 C

Minimum Operating Temperature

- 40 C

Output Current

100 mA

For Use With

MIC23250

Current page: 1 of 8
Download datasheet (162Kb)

General Description

The MIC23250 is a dual 400mA 4MHz switching regulator

with HyperLight Load™ mode. The MIC23250 is highly

efficient, consuming 33µA of quiescent current to operate

both of its outputs. A Sub-1mm height solution is easily

attainable using the tiny package (2mm x 2mm x 0.55mm)

and only six external components. Small and fast, the

MIC23250 can respond to a load transient at ultra-fast

speed while reducing output peak-to-peak voltage.

The MIC23250 has two modes of operation that is

automatically selected by the internal circuitry. Under light

load conditions, the MIC23250 goes into HyperLight

Load™ mode. The MIC23250 HyperLight Load™ uses a

Pulse-Frequency Modulation (PFM) control scheme that

controls the off time at light load. This allows the device to

reduce the amount of switching needed at light load, thus

reducing the switching losses. The MIC23250 can attain

up to 85% efficiency at 1mA output load. At higher output

currents of approximately 100mA, HyperLight Load™

mode

Modulation (PWM) mode to ensure high efficiency up to

94% at higher load. The two modes of operation ensure

that the MIC23250 maintains the highest efficiency

throughout the entire load range.

The MIC23250 operates from a 2.7V to 5.5V input and

features internal power MOSFETs that can supply up to

400mA of output current on each channel. It can operate

with a maximum duty cycle of 90%.

Requirements

The MIC23250 evaluation board requires an input power

source that is able to deliver greater than 800mA at 2.7V.

The output loads can either be an active (electronic) or

passive (resistive) load.

Getting Started

HyperLight Load is a trademark of Micrel, Inc.

July 2009

1. Connect an external supply to the V

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

automatically

terminal. Apply desired input voltage to the V

(J1) and ground (J2) terminal of the evaluation

board, paying careful attention to polarity and

supply voltage (2.7V < V

switches

back

< 5.5V). An ammeter

Pulse-Width

(J1)

Output Voltage

The MIC23250 evaluation board has fixed output voltage

options available per the table below.

Ordering Information

Note: Other voltage options available upon request. Contact Micrel.

408

MIC23250-G4YMT EV

MIC23250-AAYMT EV

MIC23250-C4YMT EV

MIC23250-S4YMT EV

) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

2. Connect a load to the V

3. Enable the MIC23250 outputs. The MIC23250

MIC23250 Evaluation Board

Part Number

may be placed between the input supply and the

to monitor the supply voltage at the V

terminal, as the ammeter and/or power lead

resistance can reduce the voltage supplied to the

input.

outputs and ground terminal (J7). The loads

can be either passive (resistive) or active

(electronic load). An ammeter can be placed

between the load and the output terminal. Ensure

that the output voltages are monitored at the V

(J4) and V

evaluation board has pre-installed pull-up resistors

(R1 and R2) that enable the device as soon as

input voltage is applied. These resistors are

optional. To disable the device, apply a voltage

below 0.5V to EN1 (J3) or EN2 (J5) terminals.

Similarly, if the pull up resistors (R1 and R2) are

not used the device may be enabled by applying a

voltage greater than 1.2V to the EN1 (J3) or EN2

(J5) terminals. Be sure that the enable voltage

never exceeds the input voltage.

Synchronous Buck Regulator

(J1) terminal to the evaluation board. Be sure

with HyperLight Load™

4MHz Dual 400mA

2 (J6) terminals.

1.2V / 1.0V Output Evaluation Board

1.2V / 1.8V Output Evaluation Board

1.2V / 3.3V Output Evaluation Board

Adjustable Output Evaluation Board

Description

1 (J4) and V

M9999-070909-C

2 (J6)

(J1)

Related parts for MIC23250-C4YMT EV

MIC23250-C4YMT EV Summary of contents

Page 1

... Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 ( July 2009 back to Pulse-Width Output Voltage The MIC23250 evaluation board has fixed output voltage options available per the table below. Ordering Information MIC23250-C4YMT EV MIC23250-G4YMT EV MIC23250-S4YMT EV (J1) IN MIC23250-AAYMT EV IN Note: Other voltage options available upon request. Contact Micrel. < 5.5V). An ammeter ...

Page 2

... OUT ⎝ R BOTTOM Compensation The MIC23250 is designed to be stable with a 0.47µH to 4.7µH inductor with a minimum of 2.2µF ceramic (X5R) output capacitor. For the adjustable MIC23250, the total feedback resistance should be kept as high as possible to reduce current loss down the feedback resistor network. This helps to improve efficiency. A feed-forward ...

Page 3

... HyperLight Load™ mode or PWM mode at a specific load current by selecting the appropriate inductance. For example in the graph below, when the inductance is 4.7µH the MIC23250 will transition into PWM mode at a load of approximately 4mA. Under the same condition, when the inductance is 1µH, the MIC23250 will transition into PWM mode at approximately 70mA. ⎞ ...

Page 4

... Micrel, Inc. MIC23250 Evaluation Board Schematic (Fixed Output) Bill of Materials Item Part Number C1, C2, C3 C1608X5R0J475K C4 VJ0603Y103KXXAT R1, R2 CRCW060310K0FKEA LQM21PN1R0M00 LQH32CNR1R0M33 LQM31P1R0M00 L1, L2 GLF251812T1R0M LQM31PNR47M00 MIPF2520D1R5 U1 MIC23250-xxYMT Notes: 1. TDK: www.tdk.com 2. Vishay: www.vishay.com 3. Murata: www.murata.com 4. FDK: www.fdk.co.jp 5. Micrel, Inc: www.micrel.com July 2009 Manufacturer ...

Page 5

... Micrel, Inc. MIC23250 Evaluation Board Schematic (Adjustable Output) Bill of Materials Item Part Number C1, C2, C3 C1608X5R0J475K C4 VJ0603Y103KXXAT C5, C6 VJ0603Y121KXAAT R1, R2 CRCW06031002FKEA R3, R5 CRCW06036653FKEA R4, R6 CRCW06034423FKEA LQM21PN1R0M00 LQH32CN1R0M33 LQM31P1R0M00 L1, L2 GLF251812T1R0M LQM31PNR47M00 MIPF2520D1R5 EPL2010-102 U1 MIC23250-AAYMT Notes: 1. TDK: www.tdk.com 2. Vishay: www.vishay.com 3. Murata: www.murata.com 4. FDK: www.fdk.co.jp 5 ...

Page 6

... Micrel, Inc. PCB Layout Recommendations (Fixed Output) July 2009 Top Layer Bottom Layer 6 MIC23250 Evaluation Board M9999-070909-C ...

Page 7

... Micrel, Inc. PCB Layout Recommendations (Adjustable Output) July 2009 Top Layer Bottom Layer 7 MIC23250 Evaluation Board M9999-070909-C ...

Page 8

... 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 July 2009 indemnify Micrel for any damages resulting from such use or sale. © 2007 Micrel, Incorporated. 8 MIC23250 Evaluation Board M9999-070909-C ...

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