MIC4684YM Micrel Inc, MIC4684YM Datasheet

IC REG BUCK 2A ADJ VOLT 8-SOIC

MIC4684YM

Manufacturer Part Number
MIC4684YM
Description
IC REG BUCK 2A ADJ VOLT 8-SOIC
Manufacturer
Micrel Inc
Series
SuperSwitcher™r
Type
Step-Down (Buck)r
Datasheet

Specifications of MIC4684YM

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
Adj to 1.235V
Current - Output
2A
Frequency - Switching
200kHz
Voltage - Input
4 ~ 30 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Primary Input Voltage
30V
No. Of Outputs
1
Output Current
2A
No. Of Pins
8
Operating Temperature Range
-40°C To +125°C
Msl
MSL 2 - 1 Year
Supply Voltage Range
4V To 30V
Termination Type
SMD
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
576-1223

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MIC4684YM
Manufacturer:
MICREL
Quantity:
21 400
Part Number:
MIC4684YM
Manufacturer:
MICREL
Quantity:
748
Part Number:
MIC4684YM
Manufacturer:
MICREL/麦瑞
Quantity:
20 000
Part Number:
MIC4684YM
0
Part Number:
MIC4684YM-TR
Manufacturer:
MICROCHIP
Quantity:
300
Part Number:
MIC4684YMTR
Manufacturer:
LATTRON
Quantity:
20 562
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
V
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
IN
33µF
35V
C
IN
3
8
Adjustable Buck Converter
VIN
EN
MIC4684BM
GND
2, 6, 7
SW
BS
FB
4
1
5
C
0.33µF/50V
BS
3A
40V
68µH
3.01k
3.01k
R1
R2
Ordering Information
Standard
MIC4684BM MIC4684YM
2.5V/1.5A
330µF
6.3V
V
OUT
Part Number
Pb-Free
1
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
80
60
40
20
0
0
MIC4684
V
V
Junction Temp. Range Package
OUT
IN
OUTPUT CURRENT (A)
vs. Output Current
= 5.0V
0.5
-40°C to +125°C
= 1.8V
Efficiency
V
OUT
1
= 3.3V
V
OUT
1.5
= 2.5V
2
M9999-012610
Micrel, Inc.
SOP-8

Related parts for MIC4684YM

MIC4684YM 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

MIC4684 A worst-case rule of thumb is to assume that 80% of the total output power dissipation is in the MIC4684 ( the diode-inductor-capacitor circuit 0.8 P D(IC 0.8 × 0.95W D(IC) P ...

Page 12

Micrel, Inc. Recommended Components for a Given Output Voltage (Feed-Forward Configuration 16V (in feed-forward configuration OUT OUT 5.0V 1.6A 3.01k 976kΩ 6.5V–16V 47µF, 20V 3.3V 1.7A 3.01k 1.78k 4.85V–16V 47µF, ...

Page 13

MIC4684 Printed Circuit Board Evaluation Board Optimized for Low Input Voltage by using Feed-Forward Diode Configuration (V Figure 7a. Bottom Side Copper Figure 7c. Bottom Side Silk Screen Abbreviated Bill of Material (Critical Components) Reference Part Number C1 594D156X0035D2T C2, ...

Page 14

Micrel, Inc. Recommended Components for a Given Output Voltage (Standard Configuration 30V OUT OUT 5.0V 1.7A 3.01k 976kΩ 8V–30V 3.3V 1.5A 3.01k 1.78k 7V–28V 2.5V 1.5A 3.01k 2.94k 6.5V–23V 1.8V 1.5A ...

Page 15

MIC4684 Printed Circuit Board General Purpose Evaluation Board (V Figure 9a. Bottom Side Copper Figure 9c. Bottom Side Silk Screen Abbreviated Bill of Material (Critical Components) Reference Part Number C1 594D156X0035D2T C2, C5 VJ0805Y104KXAAB C6 GRM426X7R334K50 C3 Optional C4 594D337X06R3D2T ...

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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