MIC4681 _ BDTIC a Leading Distributor in China

MIC4681

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 SOP package . 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 operating input voltage range: 4V to 30V
Less than 6µA typical shutdown-mode current
Up to 90% efficiency
Thermal shutdown
Overcurrent protection

Parameter

Parameter Name Value	Value
Regulator Type Step Down (Buck)	Step Down (Buck)
# of Outputs 1	1
Input Voltage Range Min (V) 4	4
Input Voltage Range Max (V) 30	30
Output Voltage Range Min (V) 1.25	1.25
Output Current (A) max 2	2
Quiescent Current (mA) typ 7	7
Switching Frequency (kHz) 400	400
Operating Temp Range -40 to 125	-40 to 125
Vfb (V) 1.25	1.25
Duty Cycle Max (%) 0.95	0.95
SHUTDOWN Current (µA) (Typ) 50	50