MIC4680 POWER CONVERTER,MIC4680应用电路

General Description

The MIC4680 Super Switcher™ 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 con tinuous output current over a wide input range in a 8-lead SOP (small outline package).

The MIC4680 is av ailable 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 pe rforms cycle-by-cycle current limiting and thermal shutdown for protection under fault conditions. In shutdown mode, the regulator draws less than 2ìA of standby current. The MIC4680 Super Switcher™ regulator requires a minimum number of external components and canoperate 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-lead SOP with a –40°C to +125°C junction temperature range.

Features

• SO-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 typ ical shutdown-mode current

• Up to 90% efficiency

• Thermal shutdown

• Over current protection

Typical Applications

1.MIC4680 +6 to +34 input 3.3V/1A output power converter

2.MIC4680 +5 to +34 input 2.5V/1A output power converter

3.MIC4680 +7.5 to +34 input multi-output power converter

4.MIC4680 Constant Current and Constant Voltage Battery Charger

5.. MIC4680 +12V to –12V/150mA Buck-Boost Converter

6. MIC4680 5V to 3.3V/5A Power Supply