MIC4684BM Micrel Inc, MIC4684BM Datasheet

MIC4684BM

Manufacturer Part Number

MIC4684BM

Description

IC REG BUCK 2A ADJ VOLT HE 8SOIC

Manufacturer

Micrel Inc

Series

SuperSwitcher™r

Type

Step-Down (Buck)r

Datasheet

1.MIC4684-3.3BM_TR.pdf (16 pages)

Specifications of MIC4684BM

Mounting Type

Surface Mount

Internal Switch(s)

Yes

Synchronous Rectifier

Number Of Outputs

Voltage - Output

Adj to 1.235V

Current - Output

Frequency - Switching

200kHz

Voltage - Input

4 ~ 30 V

Operating Temperature

-40°C ~ 125°C

Package / Case

8-SOIC (3.9mm Width)

No. Of Pins

Peak Reflow Compatible (260 C)

Current Rating

Output Voltage Max

1.235V

Supply Voltage Max

30V

Leaded Process Compatible

Voltage Regulator Type

Switching

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant, Lead free / RoHS Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

MIC4684BM

Manufacturer:

Quantity:

1 600

Current page: 1 of 16
Download datasheet (483Kb)

General Description

The MIC4684 is a high-efficiency 200kHz stepdown (buck)

switching regulator. Power conversion efficiency of above

85% is easily obtainable for a wide variety of applications.

The MIC4684 achieves 2A of continuous current in an 8-lead

SO (small outline) package at 60°C ambient temperature.

High efficiency is maintained over a wide output current range

by utilizing a boost capacitor to increase the voltage available

to saturate the internal power switch. As a result of this high

efficiency, no external heat sink is required. The MIC4684,

housed in an SO-8, can replace larger TO-220 and TO-263

packages in many applications.

The MIC4684 allows for a high degree of safety. It has a wide

input voltage range of 4V to 30V (34V transient), allowing

it to be used in applications where input voltage transients

may be present. Built-in safety features include over-current

protection, frequency-foldback short-circuit protection, and

thermal shutdown.

The MIC4684 is available in an 8-lead SO package with a

junction temperature range of –40°C to +125°C.

Typical Application

SuperSwitcher is a trademark of Micrel, Inc.

January 2010

MIC4684

6.5V to 25V

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

33µF

35V

Adjustable Buck Converter

VIN

MIC4684BM

GND

2, 6, 7

0.33µF/50V

40V

68µH

3.01k

Ordering Information

Standard

MIC4684BM MIC4684YM

2.5V/1.5A

330µF

6.3V

OUT

Part Number

Pb-Free

Features

• SO-8 package with 2A continuous output current

• Over 85% efficiency

• Fixed 200kHz PWM operation

• Wide 4V to 30V input voltage range

• Output voltage adjustable to 1.235V

• All surface mount solution

• Internally compensated with fast transient response

• Over-current protection

• Frequency foldback short-circuit protection

• Thermal shutdown

Applications

• Simple high-efficiency step-down regulator

• 5V to 3.3V/1.7A converter (60°C ambient)

• 12V to 1.8V/2A converter (60°C ambient)

• On-card switching regulator

• Dual-output ±5V converter

• Battery charger

2A High-Efficiency SuperSwitcher™ Buck Regulator

Voltage

Efficiency vs. Output Current

Adj

100

MIC4684

Junction Temp. Range Package

OUT

OUTPUT CURRENT (A)

vs. Output Current

= 5.0V

0.5

-40°C to +125°C

= 1.8V

Efficiency

OUT

= 3.3V

OUT

1.5

= 2.5V

M9999-012610

Micrel, Inc.

SOP-8

Related parts for MIC4684BM

MIC4684BM Summary of contents

Page 1

... Simple high-efficiency step-down regulator • 3.3V/1.7A converter (60°C ambient) • 12V to 1.8V/2A converter (60°C ambient) • On-card switching regulator • Dual-output ±5V converter • Battery charger Ordering Information Part Number Standard Pb-Free MIC4684BM MIC4684YM V OUT 2.5V/1.5A R1 3.01k 330µF 6.3V R2 3.01k ...

Page 2

Micrel, Inc. Pin Configuration Pin Description Pin Number Pin Name GND Detailed Pin Description Switch (SW, pin 1) The switch pin is tied to the emitter of ...

Page 3

MIC4684 Absolute Maximum Ratings Supply Voltage (V ), Note 3 ....................................... +34V IN Enable Voltage (V )......................................–0. Steady-State Output Switch Voltage (V Feedback Voltage (V ) .............................................. +12V FB Storage Temperature (T ) ........................ –65°C to +150°C ...

Page 4

Micrel, Inc. Test Circuit +12V Shutdown Input Behavior January 2010 Device Under Test 68µ VIN GND FB SOP-8 2,6,7 5 Current Limit Test Circuit OFF GUARANTEED GUARANTEED OFF ON 0.8V 2V TYPICAL TYPICAL ...

Page 5

MIC4684 Typical Characteristics (T = 25°C unless otherwise noted Efficiency without Feed OUT Forward Diode 100 12V 24V ...

Page 6

Micrel, Inc. Feedback Voltage vs. Temperature 1.210 1.209 1.208 1.207 1.206 1.205 1.204 1.203 V = 12V 1.202 OUT 100mA 1.201 OUT 1.200 TEMPERATURE (°C) Line Regulation 5.08 5.07 5.06 5.05 5.04 5.03 5.02 ...

Page 7

MIC4684 Typical 5V SOA with OUT Standard Configuration 2 OUT 0 60° 125° INPUT VOLTAGE (V) SOA Measured on ...

Page 8

Micrel, Inc. Functional Characteristics Switching Frequency Foldback 200kHz 70kHz TIME Frequency Foldback The MIC4684 folds the switching frequency back during a hard short circuit condition to reduce the energy per cycle and protect the device. January 2010 V = 12V ...

Page 9

MIC4684 Block Diagrams Enable 200kHz Oscillator MIC4684 Functional Description The MIC4684 is a variable duty cycle switch-mode regula- tor with an internal power switch. Refer to the above block diagram. Supply Voltage The MIC4684 operates from a +4V to +30V ...

Page 10

Micrel, Inc. Applications Information Adjustable Regulators Adjustable regulators require a 1.23V feedback signal. Rec- ommended voltage-divider resistor values for common output voltages are included in Table 1. For other voltages, the resistor values can be determined using the following formulas: ...

Page 11

... A circuit with sample layouts are provided. See Figure 7. Gerber files are available upon request. Feed Forward Diode The FF diode (feed forward) provides an external bias source directly to the main pass element, this reduces V allowing the MIC4684 to be used in very low head-room ap- plications I. MIC4684BM ...

Page 12

... Schottky Schottky 595D476X0020D2T SS23 2A, 30V Vishay-Dale Schottky Schottky 595D476X0020D2T SS23 2A, 30V Schottky Sumida 595D476X0020D2T SS23 2A, 30V Vishay-Dale Schottky Schottky 595D476X0020D2T SS23 to the bootstrap pin 16V MBRX120 1A/20V L1 U1 MIC4684BM 47µ VIN SW C6 0.33µ 50V GND B340A or SOP SS34 2 OUT 12 D2 ...

Page 13

... D1 B340A D2 MBRX120 L1 CDRH104R-470MC U1 MIC4684BM Notes: 1. Vishay Dale, Inc., tel: 1 402-644-4218, http://www.vishay.com 2. Vishay Sprague, Inc., tel: 1 207-490-7256, http://www.vishay.com 3. Diodes Inc, tel: (805) 446-4800, http://www.diodes.com 4. Sumida, tel: (408) 982-9960, http://www.sumida.com 5. Micro Commercial Components, tel: (800) 346-3371 6. Micrel, Inc. tel: (408) 944-0800, http://www.micrel.com January 2010 Figure 7b ...

Page 14

... Vishay-Dale Schotty 595D336X0035R2T SS34 33µF, 35V 3A, 40V Vishay-Dale Schotty 595D336X0035R2T SS34 33µF, 35V 3A, 40V Vishay-Dale Schotty 595D336X0035R2T SS334 47µF, 25V 3A, 40V Vishay-Dale Schotty 595D476X0025D2T SS334 ( 30V MIC4684BM 47µ VIN SW C6 0.33µ 50V GND B340A or SOP SS34 2 OUT OUT 68µ ...

Page 15

... C4 594D337X06R3D2T D1 B340A L1 CDRH104R-470MC U1 MIC4684BM Notes: 1. Vishay Dale, Inc., tel: 1 402-644-4218, http://www.vishay.com 2. Vishay Sprague, Inc., tel: 1 207-490-7256, http://www.vishay.com 3. Diodes Inc, tel: (805) 446-4800, http://www.diodes.com 4. Sumida, tel: (408) 982-9960, http://www.sumida.com 5. Micrel, Inc. tel: (408) 944-0800, http://www.micrel.com January 2010 ...

Page 16

... Micrel, Inc. Package Information MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 tEl This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. ...

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