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MIC4682BM

Description
Switching Regulator Voltage-mode 1.1A 220kHz Switching Freq-Max PDSO8
CategoryPower/power management    The power supply circuit   
File Size904KB,15 Pages
ManufacturerMicrel ( Microchip )
Websitehttps://www.microchip.com
Download Datasheet Parametric View All

MIC4682BM Overview

Switching Regulator Voltage-mode 1.1A 220kHz Switching Freq-Max PDSO8

MIC4682BM Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerMicrel ( Microchip )
package instructionSOP, SOP8,.25
Reach Compliance Code_compli
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeVOLTAGE-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage34 V
Minimum input voltage4 V
Nominal input voltage12 V
JESD-30 codeR-PDSO-G8
JESD-609 codee0
length4.9 mm
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature125 °C
Minimum operating temperature-40 °C
Maximum output current1.1 A
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP8,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)240
Certification statusNot Qualified
Maximum seat height1.879 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency220 kHz
Temperature levelAUTOMOTIVE
Terminal surfaceTin/Lead (Sn85Pb15)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width3.9 mm
MIC4682
Precision Current Limit SOIC-8
SuperSwitcher™ Buck Regulator
General Description
Features
The MIC4682 is an easy-to-use step-down (buck) switch-
Programmable output current limit
mode voltage regulator. It features a programmable
– 10% accuracy over temperature
current limit that allows 10% current limit accuracy over its
Wide 4V to 34V operating input voltage range
full operating temperature range. The precision current
Fixed 200kHz PWM operation
limit makes the MIC4682 ideal for constant-voltage
Power SOIC-8 package allows 2A continuous output
constant-current applications, such as simple battery
current
chargers. The precision current limit also gives designers
the ability to set the maximum output current below the
All surface mount solution
saturation current rating of the inductor. This allows the
Internally compensated
use of the smallest possible inductors for a given
Less than 1µA typical shutdown-mode current
application, saving valuable space and cost.
Thermal shutdown protection
The MIC4682 is a very robust device. Its 4V to 34V input
voltage range allows the MIC4682 to safely be used in
applications where voltage transients may be present.
Applications
Additional protection features include cycle-by-cycle
Battery chargers
current limiting and over-temperature shutdown. The
White LED drivers
MIC4682 is available in a thermally optimized power
SOIC-8 package that allows it to achieve 2A of continuous
Constant voltage constant current step-down
output current.
converters
The MIC4682 requires a minimum number of external
Simple step-down regulator with precise current limit
components and can operate using a standard series of
USB power supplies
inductors. Compensation is provided internally for fast
transient response and ease of use. The MIC4682 is
available in the 8-pin power SOIC with a –40°C to +125°C
junction temperature range.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
___________________________________________________________________________________________________________
Typical Application
+7.5V to +34V
C1
10µF
50V
(x2)
MIC4682
5
IN
SW
8
L1
68µH
R1
3.01k
R2
976
5V/1A
6
OUTPUT VOLTAGE (V)
MIC4682 Current Limit
Characteristics
4
SHDN
FB
GND
1
R3
10M ISET
3
R4
16.2k
D1
B240
C2
220µF
10V
5
4
3
2
1
V
IN
= 12V
0
0
0.5
1
1.5
CURRENT LIMIT (A)
2
2, 6, 7
Constant Current/Constant Voltage Li-Ion Battery Charger
SuperSwitcher is a 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 2007
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