MIC4680_08 MICREL [Micrel Semiconductor], MIC4680_08 Datasheet

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MIC4680_08

Manufacturer Part Number
MIC4680_08
Description
1A 200kHz SuperSwitcher Buck Regulator
Manufacturer
MICREL [Micrel Semiconductor]
Datasheet
General Description
The MIC4680 SuperSwitcher™ is an easy-to-use fixed or
adjustable output voltage step-down (buck) switch-mode
voltage regulator. The 200kHz MIC4680 achieves up to
1.3A of continuous output current over a wide input range
in a 8-pin SOIC.
The MIC4680 is available in 3.3V and 5V fixed output
versions or adjustable output down to 1.25V.
The MIC4680 has an input voltage range of 4V to 34V,
with excellent line, load, and transient response. The
regulator performs cycle-by-cycle current limiting and
thermal shutdown for protection under fault conditions. In
shutdown mode, the regulator draws less than 2µA of
standby current.
The MIC4680 SuperSwitcher™ regulator requires a mini-
mum number of external components and can operate
using a standard series of inductors and capacitors.
Frequency compensation is provided internally for fast
transient response and ease of use.
The MIC4680 is available in the 8-pin SOIC with a
–40°C to +125°C junction temperature range.
Typical Application
SHUTDOWN
SuperSwitcher is a trademark of Micrel, Inc.
March 2008
ENABLE
+6V to +34V
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Power
SOIC-8
15µF
35V
C1
Fixed Regulator Circuit
2
1
IN
SHDN
MIC4680-3.3BM
GND
5–8
SW
FB
3
4
D1
B260A or
SS26
68µH
L1
3.3V/1A
C2
220µF
16V
SHUTDOWN
Features
• SOIC-8 package with up to 1.3A output current
• All surface mount solution
• Only 4 external components required
• Fixed 200kHz operation
• 3.3V, 5V, and adjustable output versions
• Internally compensated with fast transient response
• Wide 4V to 34V operating input voltage range
• Less than 2µA typical shutdown-mode current
• Up to 90% efficiency
• Thermal shutdown
• Overcurrent protection
Applications
• Simple 1A high-efficiency step-down (buck) regulator
• Replacement of TO-220 and TO-263 designs
• Efficient pre-regulator (5V to 2.5V, 12V to 3.3V, etc.)
• On-card switching regulators
• Positive-to-negative converter (inverting buck-boost)
• Simple battery charger
• Negative boost converter
• Higher output current regulator using external FET
ENABLE
+5V to +34V
Power
SOIC-8
1A 200kHz SuperSwitcher™
15µF
35V
C1
Adjustable Regulator Circuit
Buck Regulator
2
1
IN
SHDN
MIC4680
MIC4680BM
GND
5–8
SW
FB
3
4
D1
B260A or
SS26
68µH
L1
M9999-032808
R1
3.01k
R2
2.94k
2.5V/1A
C2
220µF
16V

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