MIC33050-4YHL TR Micrel Inc, MIC33050-4YHL TR Datasheet

High Efficiency 600mA Inductor-less Buck Regulator Featuring Hyper Light Load

MIC33050-4YHL TR

Manufacturer Part Number

MIC33050-4YHL TR

Description

High Efficiency 600mA Inductor-less Buck Regulator Featuring Hyper Light Load

Manufacturer

Micrel Inc

Type

Step-Down (Buck)r

Datasheets

1.MIC33050-GYHL_TR.pdf (13 pages)

2.MIC33050-4YHL_TR.pdf (4 pages)

Specifications of MIC33050-4YHL TR

Internal Switch(s)

Yes

Synchronous Rectifier

Yes

Number Of Outputs

Voltage - Output

1.2V

Current - Output

600mA

Frequency - Switching

4MHz

Voltage - Input

2.7 ~ 5.5 V

Operating Temperature

-40°C ~ 125°C

Mounting Type

Surface Mount

Package / Case

12-MLF®, QFN

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

576-3044-2

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General Description

The MIC33050 is a 600mA 4MHz switching regulator

featuring HyperLight Load™ mode. The MIC33050 is

highly efficient throughout the entire output current

range, drawing just 20µA of quiescent current in

operation. The tiny 3mm x 3mm MLF

combination with the 4MHz switching frequency, enables

a compact sub-1mm height solution with only three

external components. The MIC33050 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 MIC33050 automatically selects between two modes

of operation for optimum efficiency. Under light load

conditions, the MIC33050 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 load, thereby

increasing operating efficiency. The MIC33050 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 93% efficiency at higher load.

The two modes of operation ensure the highest

efficiency across the entire load range.

The MIC33050 operates from an input voltage range of

2.7V to 5.5V and features internal power MOSFETs that

deliver up to 600mA 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 MIC33050 is available in fixed output

versions supporting an output voltage as low as 0.72V.

Requirements

The MIC33050 evaluation board requires an input power

source that is able to deliver greater than 650mA at

2.7V. The output load can either be an active (electronic)

or passive (resistive) load.

HyperLight Load is a trademark of Micrel, Inc.

February 2009

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

package, in

408

Getting Started

Output Voltage

The MIC33050 evaluation board is available with the

following output voltage options listed below:

Ordering Information

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

MIC33050-GYHL EV

MIC33050-4YHL EV

MIC33050-SYHL EV

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

MIC33050 Evaluation Board

1. Connect an external supply to the V

2. Connect a load to the V

3. Enable

4MHz Internal Inductor PWM Buck

Regulator with HyperLight Load™

Part Number

terminal. Apply the desired input voltage to V

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

board, paying careful attention to polarity and

supply voltage (2.7V ≤ V

may be placed between the input supply and the

voltage at the V

ammeter and/or power lead resistance can

reduce the voltage supplied to the device.

terminal (J4). The load can be either passive

(resistive)

ammeter may be placed between the load and

the output terminal. Ensure the output voltage is

monitored at the V

evaluation board has a pull-up resistor to V

disable the device, apply a voltage below 0.5V

to the EN terminal. In the absence of the pull-up

resistor, the device is enabled by applying a

voltage greater than 1.2V to the EN 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 unknown state.

(J1) terminal. Be sure to monitor the supply

the

1.2V Fixed Output Evaluation Board

1.8V Fixed Output Evaluation Board

3.3V Fixed Output Evaluation Board

active

MIC33050.

OUT

(J3) terminal.

(J1) terminal, since the

(electronic

Description

OUT

≤ 5.5V). An ammeter

(J3) and ground

The

M9999-022409-C

load).

MIC33050

(J1)

. To

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MIC33050-4YHL TR Summary of contents

Page 1

... The two modes of operation ensure the highest efficiency across the entire load range. The MIC33050 operates from an input voltage range of 2.7V to 5.5V and features internal power MOSFETs that deliver up to 600mA of output current. This step-down regulator provides an output voltage accuracy of ± ...

Page 2

... MIC33050 during light load currents by only switching when it is needed. As the load current increases, the MIC33050 goes into continuous conduction mode (CCM) and switches at a frequency centered at 4MHz. The equation to calculate the load when the MIC33050 goes into continuous conduction mode may be approximated by the following formula: − ...

Page 3

... Micrel, Inc. MIC33050 Typical Circuit Bill of Materials Item Part Number C1, C3 C1608X5R0J475K C2 VJ0603A561KXAA R1 CRCW06031003FT1 U1 MIC33050-xYHL Notes: 1. TDK: www.tdk.com. 2. Vishay: www.vishay.com. 3. Micrel, Inc: www.micrel.com. February 2009 Manufacturer Description (1) TDK 4.7µF Ceramic Capacitor, 6.3V, X5R, Size 0603 (2) Vishay 560pF Ceramic Capacitor, 50V, NPO, Size 0603 ...

Page 4

... A 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 indemnify Micrel for any damages resulting from such use or sale. February 2009 Top Layer Bottom Layer © 2008 Micrel, Incorporated. 4 MIC33050 Evaluation Board M9999-022409-C ...

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