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MIC28304 Dataheets PDF



Part Number MIC28304
Manufacturers Micrel Semiconductor
Logo Micrel Semiconductor
Description 70V 3A Power Module
Datasheet MIC28304 DatasheetMIC28304 Datasheet (PDF)

MIC28304 70V 3A Power Module Hyper Speed Control™ Family General Description Micrel’s MIC28304 is synchronous step-down regulator module, featuring a unique adaptive ON-time control architecture. The module incorporates a DC-to-DC controller, power MOSFETs, bootstrap diode, bootstrap capacitor and an inductor in a single package. The MIC28304 operates over an input supply range from 4.5V to 70V and can be used to supply up to 3A of output current. The output voltage is adjustable down to 0.8V w.

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MIC28304 70V 3A Power Module Hyper Speed Control™ Family General Description Micrel’s MIC28304 is synchronous step-down regulator module, featuring a unique adaptive ON-time control architecture. The module incorporates a DC-to-DC controller, power MOSFETs, bootstrap diode, bootstrap capacitor and an inductor in a single package. The MIC28304 operates over an input supply range from 4.5V to 70V and can be used to supply up to 3A of output current. The output voltage is adjustable down to 0.8V with a guaranteed accuracy of ±1%. The device operates with programmable switching frequency from 200kHz to 600kHz. Micrel’s HyperLight Load™ architecture provides the same high-efficiency and ultra-fast transient response as the Hyper Speed Control™ architecture under the medium to heavy loads, but also maintains high efficiency under light load conditions by transitioning to variable frequency, discontinuous-mode operation. The MIC28304 offers a full suite of protection features. These include undervoltage lockout, internal soft-start, foldback current limit, “hiccup” mode short-circuit protection, and thermal shutdown. Datasheets and support documentation are available on Micrel’s web site at: www.micrel.com. Features • Easy to use − Stable with low-ESR ceramic output capacitor − No compensation and no inductor to choose • 4.5V to 70V input voltage • Single-supply operation • Power Good (PG) output • Low radiated emission (EMI) per EN55022, Class B • Adjustable current limit • Adjustable output voltage from 0.9V to 24V (also limited by duty cycle) • 200kHz to 600kHz, programmable switching frequency • Supports safe start-up into a pre-biased output • –40°C to +125°C junction temperature range • Available in 64-pin, 12mm × 12mm × 3mm QFN package Applications • Distributed power systems • Industrial, medical, telecom, and automotive Typical Application Hyper Speed Control, HyperLight Load, and Any Capacitor are trademarks of Micrel, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com March 25, 2014 Revision 1.1 Micrel, Inc. MIC28304 Ordering Information Part Number MIC28304-1YMP MIC28304-2YMP Switching Frequency 200kHz to 600kHz 200kHz to 600kHz Features HyperLight Load Hyper Speed Control Package 64-pin 12mm × 12mm QFN 64-pin 12mm × 12mm QFN Junction Temperature Range –40°C to +125°C –40°C to +125°C Lead Finish Pb-Free Pb-Free Pin Configuration 64-Pin 12mm × 12mm QFN (MP) (Top View) Pin Description Pin Number 1, 2, 3, 54, 64 4 Pin Name GND ILIM Pin Function Analog Ground. Ground for internal controller and feedback resistor network. The analog ground return path should be separate from the power ground (PGND) return path. Current Limit Setting. Connect a resistor from SW (pin #4) to ILIM to set the over-current threshold for the converter. Supply Voltage for Controller. The VIN operating voltage range is from 4.5V to 70V. A 0.47μF ceramic capacitor from VIN (pin # 60) to AGND is required for decoupling. The pin # 5 should be externally connected to either PVIN or pin # 60 on PCB. Switch Node and Current-Sense Input. High current output driver return. The SW pin connects directly to the switch node. Due to the high-speed switching on this pin, the SW pin should be routed away from sensitive nodes. The SW pin also senses the current by monitoring the voltage across the low-side MOSFET during OFF time. 5, 60 VIN 6, 40 to 48, 51 SW March 25, 2014 2 Revision 1.1 Micrel, Inc. MIC28304 Pin Description (Continued) Pin Number 7, 8 Pin Name FREQ Pin Function Switching Frequency Adjust Input. Leaving this pin open will set the switching frequency to 600kHz. Alternatively a resistor from this pin to ground can be used to lower the switching frequency. Power Ground. PGND is the return path for the buck converter power stage. The PGND pin connects to the sources of low-side N-Channel external MOSFET, the negative terminals of input capacitors, and the negative terminals of output capacitors. The return path for the power ground should be as small as possible and separate from the analog ground (GND) return path. Power Input Voltage. Connection to the drain of the internal high-side power MOSFET. Output Voltage. Connection with the internal inductor, the output capacitor should be connected from this pin to PGND as close to the module as possible. No Connection. Leave it floating. Anode Bootstrap Diode Input. Anode connection of internal bootstrap diode, this pin should be connected to the PVDD pin. Bootstrap Capacitor. Connection to the internal bootstrap capacitor. Leave floating, no connect. Bootstrap Resistor. Connection to the internal bootstrap resistor and high-side power MOSFET drive circuitry. Leave floating, no connect. Feedback Input. Input to the transconductance amplifier of the control loop. The FB pin is regulated to 0.8V. A resistor divider connecting the feedback to the output is used to set the desired outp.


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