MIC33163 Datasheet, PDF (1/19 Pages) Micrel Semiconductor – Buck Regulator with Integrated Inductor

MIC33163/4
4MHz, 1A, Buck Regulator with Integrated
Inductor and HyperLight Load^®
General Description
The MIC33163/4 is a highly-efficient synchronous buck
regulator with integrated inductor which provides the
optimal trade-off between footprint and efficiency. The
MIC33163/4 operates at 4MHz switching frequency and
provides up to 1A output current. In addition, the 100%
duty cycle and HyperLight Load^® (HLL) mode-of-operation
delivers very-high efficiency at light loads and ultra-fast
transient response which makes the MIC33163/4 perfectly
suited for any space constrained 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 MIC33163/4 provides a small compact total solution
size of 4.6mm × 7mm with very few tiny external
components.
At higher loads, the MIC33163/4 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 soft-start to reduce inrush current, fold-
back current limit, power good (PG) indicator and thermal
shutdown. The MIC33163/4 is available in 20-pin 2.5mm ×
3.0mm × 1.1mm QFN package with an operating junction
temperature range from –40°C to +125°C.
Datasheets and support documentation are available on
Micrel’s website at: www.micrel.com.
Features
• Integrated MOSFETs and inductor
• 100% duty cycle
• 4MHz PWM operation in continuous mode
• 1A output current
• Low output voltage ripple
• 85% typical efficiency at 1mA, up to 93% peak efficiency
• Ultra-fast transient response
• Advanced copper lead frame design provides superior
thermal performance
• Low-radiated emission (EMI) per EN55022, class B
• Adjustable output voltage 0.7V to 5V
• Thermal-shutdown and current-limit protection
• Configurable soft-start with pre-bias start-up capability
• Auto discharge of 180Ω (MIC33164 only)
• Low profile 2.5mm × 3.0mm ×1.1mm QFN packages
• 0.1µA shutdown current
• 33µA quiescent current
Applications
• 5V point-of-load (POL)
• Low-voltage distributed power systems
• Space-constrained applications
• Portable devices
• SSD storage systems
• Digital cameras
Typical Application
100
90
80
70
60
50
40
30
20
10
10
Efficiency vs.
Output Current
V_OUT = 2.5V
V_OUT = 1.8V
V_OUT =3.3V
V_IN = 5V
100
OUTPUT CURRENT(mA)
1000
HyperLight Load is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
May 22, 2014
Revision 1.1