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MIC4681

Micrel Semiconductor
Part Number MIC4681
Manufacturer Micrel Semiconductor
Description 2A-Peak SuperSwitcher SOP-8 Buck Regulator
Published Mar 26, 2005
Detailed Description MIC4681 Micrel MIC4681 2A-Peak SuperSwitcher™ SOP-8 Buck Regulator Final Information General Description The MIC4681 ...
Datasheet PDF File MIC4681 PDF File

MIC4681
MIC4681


Overview
MIC4681 Micrel MIC4681 2A-Peak SuperSwitcher™ SOP-8 Buck Regulator Final Information General Description The MIC4681 SuperSwitcher™ is an easy-to-use step-down (buck) voltage-mode switching regulator.
The 200kHz MIC4681 achieves over 1A of continuous output current over a 4V to 30V input range in an 8-lead SOPpackage .
The MIC4681 features a high 2.
1A minimum current limit, making the device ideal for pulsed current applications such as GSM and TDMA cell phone battery chargers and power supplies.
The MIC4681 sustains an output of 4.
2V/2A within a typical GSM charging environment.
The MIC4681 has an input voltage range of 4V to 30V, 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 6µA of standby current.
The MIC4681 SuperSwitcher™ regulator requires a minimum 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 MIC4681 is available in the 8-lead SOP with a –40°C to +125°C junction temperature range.
Features • • • • • • • • • • • • SO-8 package with over 1A continuous output current Capable of 2A pulse charging for GSM applications All surface mount solution Only 4 external components required Fixed 200kHz operation Output adjustable down to 1.
25V Internally compensated with fast transient response Wide 4V to 30V operating input voltage range Less than 6µA typical shutdown-mode current Up to 90% efficiency Thermal shutdown Overcurrent protection Applications • Cellular phone battery charger • Cellular phone power supply • Simple 1A continuous high-efficiency step-down (buck) regulator • Replacement of a TO-220 and TO-263 designs • Positive-to-negative converter (inverting buck-boost) • Negative boost converter • Higher output current regulator using external FET...


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