The MIC33263/4 is a highly efficient synchronous buck regulator with integrated inductor which provides the optimal trade-off between footprint and efficiency. The MIC33263/4 operates at 4MHz switching frequency and provides up to 2A output current. In addition, the 100% duty cycle and HLL mode of operation delivers very-high efficiency at light loads and ultra-fast transient response which makes the MIC33263/4 perfectly suited for any space contained application and great alternative for low dropout regulators. An additional benefit of this proprietary architecture is very low output ripple voltage throughout the entire load range with the use of small output capacitors.
The MIC33263/4 provides small compact total solution size of 4.6mm x 7mm with very few tiny external components.
At higher loads, the MIC33263/4 provides a constant switching frequency around 4MHz while achieving peak efficiencies up to 93%. It also includes under-voltage lockout to ensure proper operation under power-sag conditions, internal softstart to reduce inrush current, foldback current limit, power good indicator and thermal shutdown. The MIC33263/4 is available in 20-pin 2.5mm × 3.0mm x 1.9mm QFN package with an operating junction temperature range from –40°C to +125°C.
Integrated MOSFETs and inductor
100% duty cycle
4MHz PWM operation in continuous mode
2A output current
Low output voltage ripple
85% typical efficiency at 1mA and up to 93% peak efficiency
Ultra-fast transient response
Advanced copper lead frame design provides superior thermal performance
Thermal shutdown and current-limit protection
Low radiated emission (EMI) per EN55022, class B
Adjustable output voltage 0.7V to 5V
Configurable soft-start with pre-bias start-up capability
Auto Discharge of 180Ω (MIC33264 only)
Low profile 2.5mm x 3.0mm x 1.9mm QFN packages
0.1μA shutdown current
33μA quiescent current
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