MIC33163/4 4MHz, 1A, Buck Regulator with Integrated Inductor and HyperLight Load General Description Features The MIC33163/4 is a highly-efficient synchronous buck Integrated MOSFETs and inductor regulator with integrated inductor which provides the 100% duty cycle optimal trade-off between footprint and efficiency. The 4MHz PWM operation in continuous mode MIC33163/4 operates at 4MHz switching frequency and 1A output current provides up to 1A output current. In addition, the 100% duty cycle and HyperLight Load (HLL) mode-of-operation Low output voltage ripple delivers very-high efficiency at light loads and ultra-fast 85% typical efficiency at 1mA, up to 93% peak efficiency transient response which makes the MIC33163/4 perfectly Ultra-fast transient response suited for any space constrained application and great Advanced copper lead frame design provides superior alternative for low dropout regulators. An additional benefit thermal performance of this proprietary architecture is very low output ripple Low-radiated emission (EMI) per EN55022, class B voltage throughout the entire load range with the use of small output capacitors. Adjustable output voltage 0.7V to 5V Thermal-shutdown and current-limit protection The MIC33163/4 provides a small compact total solution size of 4.6mm 7mm with very few tiny external Configurable soft-start with pre-bias start-up capability components. Auto discharge of 180 (MIC33164 only) At higher loads, the MIC33163/4 provides a constant Low profile 2.5mm 3.0mm 1.1mm QFN packages switching frequency around 4MHz while achieving peak 0.1A shutdown current efficiencies up to 93%. It also includes under-voltage 33A quiescent current lockout to ensure proper operation under power-sag conditions, internal soft-start to reduce inrush current, fold- Applications back current limit, power good (PG) indicator and thermal 5V point-of-load (POL) shutdown. The MIC33163/4 is available in 20-pin 2.5mm 3.0mm 1.1mm QFN package with an operating junction Low-voltage distributed power systems temperature range from 40C to +125C. Space-constrained applications Portable devices Datasheets and support documentation are available on Micrels website at: www.micrel.com. SSD storage systems Digital cameras Typical Application Efficiency vs. Output Current 100 V = 2.5V V = 3.3V OUT OUT 90 80 70 V = 1.8V OUT 60 50 40 30 20 V = 5V IN 10 0 10 100 1000 OUTPUT CURRENT (mA) HyperLight Load is a registered trademark of Micrel, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC33163/4 Ordering Information Output Auto (1, 2) Part Number Junction Temperature Range Package Voltage Discharge MIC33163YGJ ADJ No 40C to +125C 20-Pin 2.5mm 3mm QFN MIC33164YGJ ADJ Yes 20-Pin 2.5mm 3mm QFN 40C to +125C Note: 1. QFN is a GREEN, RoHS-compliant package. Mold compound is Halogen Free. 2. Pb-Free Lead finish is Matte Tin. Pin Configuration 2.5mm 3mm QFN (GJ) Adjustable Output Voltage (Top View) Pin Description Pin Number Pin Name Pin Function 1, 20 PVIN Power Input Voltage: Connect a capacitor to PGND to decouple the noise. 2, 8, 9 PGND Power Ground. 3, 4, 5, 6, 7 SW Switch (Output): Internal power MOSFET output switches. Disable pull-down 180 (MIC33164 only). 10,11,12,13 VOUT Inductor Output. Connect a capacitor to PGND to filter the switcher output voltage Analog Ground: Connect to central ground point where all high current paths meet (CIN, COUT, 14 AGND PGND) for best operation. 15 AVIN Analog Input Voltage: Connect a capacitor to ground to decouple the noise. 16 SS Soft-Start: Place a capacitor from SS pin to ground to program the soft start time. Power Good: Open Drain output for the power good indicator. Place a resistor between this pin and a 17 PG voltage source to detect a power good condition. 18 FB Feedback: Connect a resistor divider from VOUT to AGND to set the output voltage. Enable (Input): Logic high enables operation of the regulator. Logic low will shut down the device. Do 19 EN not leave floating. Revision 2.0 November 5, 2014 2