Microchip MIC23030-4YMT Manual

Microchip Ikke kategoriseret MIC23030-4YMT

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Side 1/6

MIC23030 Evaluation Board

8MHz PWM 400mA Buck Regulator

with HyperLight Load™

HyperLight Load is a trademark of Micrel, Inc. MLF is a registered trademark of Amkor Technology.

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

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

August 2008 M9999-072208-A

General Description

The MIC23030 is a 400mA 8MHz switching regulator

featuring HyperLight Load™ mode. The MIC23030 is

highly efficient throughout the entire output current range,

drawing just 21µA of quiescent current in operation. The

tiny 1.6 x 1.6mm MLF® package, in combination with the

8MHz switching frequency, enables a compact sub-1mm

height solution with only three external components. The

MIC23030 provides accurate output voltage regulation

under the most demanding conditions and responds

extremely quickly to a load transient with exceptionally

small output voltage ripple.

Factoring in the output current, the internal circuitry of the

MIC23030 automatically selects between two modes of

operation for optimum efficiency. Under light load

conditions, the MIC23030 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 MIC23030 attains up

to 83% 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 91% efficiency at higher loads. The two modes of

operation ensure the highest efficiency across the entire

load range.

The MIC23030 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 -40ºC to +125ºC.

The MIC23030 is available in fixed or adjustable versions

supporting an output voltage as low as 0.7V.

Requirements

The MIC23030 evaluation board requires an input power

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

to the MIC23030. The output load can either be an active

(electronic) or passive (resistive) load.

Getting Started

1. Connect an external supply to the V IN (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 MIC23030. The MIC23030 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 the

enable. 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 enable pin

must be either pulled high or low for proper

operation. Removing the pull-up resistor and

leaving the pin floating will cause the regulator to

operate in an indeterminable state.

Output Voltage

The MIC23030 evaluation board is available with the

following output voltage options listed below:

Ordering Information

Part Number Description

MIC23030-AYMT EV Adjustable Output Evaluation Board

MIC23030-CYMT EV 1.0V Fixed Output Evaluation Board

MIC23030-4YMT EV 1.2V Fixed Output Evaluation Board

MIC23030-FYMT EV 1.5V Fixed Output Evaluation Board

MIC23030-GYMT EV 1.8V Fixed Output Evaluation Board

Note: Other voltage options available on request

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MIC23030-4YMT

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