Microchip MIC23031-4YMT Manual

Microchip Ikke kategoriseret MIC23031-4YMT

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Side 1/8

MIC23031 Evaluation Board

4MHz PWM 400mA Buck Regulator

with HyperLight Load®

HyperLight Load is a registered trademark of Micrel, Inc.

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

June 17, 2014 Revision 2.0

General Description

The MIC23031 is a 400mA 4MHz switching regulator

featuring HyperLight Load® mode. The MIC23031 is

highly-efficient throughout the entire output current range,

drawing just 21µA of quiescent current in operation. The

tiny 1.6mm  1.6mm Thin DFN package in combination

with the 4MHz switching frequency enables a compact

sub-1mm height solution with only three external

components. The MIC23031 provides accurate output

voltage regulation under the most demanding conditions

responding extremely quickly to a load transient with

exceptionally small output voltage ripple.

Factoring in the output current, the internal circuitry of the

MIC23031 automatically selects between two modes of

operation for optimum efficiency. Under light-load

conditions, the MIC23031 goes into HyperLight Load

mode. HyperLight Load uses a pulse-frequency

modulation (PFM) control scheme that controls the off-time

at light load. This proprietary architecture reduces the

amount of switching needed at light loads, thereby

increasing operating efficiency. The MIC23031 attains up

to 88% efficiency at 1mA output load. As the load current

increases beyond approximately 100mA, the device

operates using the pulse-width modulation (PWM) method

for up to 93% efficiency at higher loads. The two modes of

operation ensure the highest efficiency across the entire

load range.

The MIC23031 operates from an input voltage range of

2.7V to 5.5V and features internal power MOSFETs that

deliver up to 400mA of output current. This step-down

regulator provides an output voltage accuracy of 2.5%

across the junction temperature range of  40 C to  125 C.

The MIC23031 is available in fixed or adjustable versions

supporting an output voltage as low as 0.7V.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Requirements

The MIC23031 evaluation board requires an input power

source that is able to deliver greater than 500mA at 2.7V

to the MIC23031. The output load can either be an active

(electronic) or passive (resistive) load.

Getting Started

1. Connect an external supply to the VIN (J1)

terminal.

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

(J2) terminals of the evaluation board, paying careful

attention to polarity and supply voltage (2.7V  VIN 

5.5V). An ammeter may be placed between the input

supply and the VIN (J1) terminal. Be sure to monitor

the supply voltage at the VIN (J1) terminal, since the

ammeter and/or power-lead resistance can reduce the

voltage supplied to the device.

2. Connect a load to the VOUT (J3) and ground

terminal (J4).

The load can be either passive (resistive) or active

(electronic) load. An ammeter may be placed between

the load and the output terminal. Ensure the output

voltage is monitored at the VOUT (J3) terminal.

3. Enable the MIC23031.

The MIC23031 evaluation board has a pull-up resistor

to VIN. To disable the device, apply a voltage below

0.5V to the EN (J5) terminal or place a jumper on JP1

to ground EN. In the absence of the pull-up resistor,

the device is enabled by applying a voltage greater

than 1.2V to the EN (J5) terminal. The EN pin must be

either pulled high or low for proper operation. Remove

the pull-up regulator to operate in an indeterminable

state.

Output Voltage

The MIC23031 evaluation board is available with the

output voltage options listed in the Ordering Information

table.

Ordering Information

Part Number Description

MIC23031-AYMT EV Adjustable-Output Evaluation Board

MIC23031-CYMT EV 1.0V Fixed-Output Evaluation Board

MIC23031-4YMT EV 1.2V Fixed-Output Evaluation Board

MIC23031-FYMT EV 1.5V Fixed-Output Evaluation Board

MIC23031-GYMT EV 1.8V Fixed-Output Evaluation Board

Note: Other voltage options available upon request.

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MIC23031-4YMT

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