MIC2164/-2/-3/C Synchronous Buck Controllers featuring Adaptive On-Time Control 28V Input, Constant Frequency Hyper Speed Control Family General Description The Micrel MIC2164/-2/-3/C are constant-frequency, synchronous buck controllers featuring adaptive on-time Hyper Speed Control control. The MIC2164/-2/-3/C are the first products in the new Hyper Speed Control family of buck controllers Features introduced by Micrel. Hyper Speed Control architecture enables high delta V The MIC2164/-2/-3/C controllers operate over an input operation (V = 28V and V = 0.8V) and smaller HSD OUT supply range of 3V to 28V, and are independent of the IC output capacitors than competitors supply voltage. The devices are capable of supplying 25A 3V to 28V input voltage output current. While the MIC2164 operates at 300kHz, Any Capacitor stable (Zero ESR to high ESR) the MIC2164-2 operates at 600kHz, and the MIC2164-3 25A output current capability operates at 1MHz. 300kHz/600kHz/1MHz switching frequency A unique Hyper Speed Control architecture allows for Adaptive on-time mode control ultra-fast transient response while reducing the output Adjustable output from 0.8V to 5.5V with 1% capacitance and also makes High VIN/Low VOUT operation possible. The MIC2164/-2/-3/C controllers (MIC2164/-2/-3) or 3% (MIC2164C) FB accuracy utilizes an architecture which is adaptive TON ripple Up to 95% efficiency controlled. A UVLO feature is provided to ensure proper Foldback current-limit, hiccup mode short-circuit operation under power-sag conditions to prevent the protection, thermal shutdown, and safe pre-bias startup external power MOSFET from overheating. A soft start 6ms Internal soft start feature is provided to reduce the inrush current. Foldback 40C to +125C junction temperature range current limit and hiccup mode short-circuit protection ensure FET and load protection. Available in 10-pin MSOP package The MIC2164/-2/-3/C controllers are available in a 10-pin Applications MSOP (MAX1954A-compatible) package with a junction Set-top box, gateways and routers operating range from 40C to +125C. Printers, scanners, graphic cards and video cards Datasheets and support documentation are available on Telecommunication, PCs and servers Micrels web site at: www.micrel.com. Typical Application MIC2164 12V to 3.3V Efficiency 100 95 90 85 80 75 70 65 60 55 VIN=5V 50 0 4 8 12 16 20 MIC2164/-2/-3/C Synchronous Controllers Featuring Adaptive On-Time OUTPUT CURRENT (A) Control Hyper Speed Control 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 Micrel, Inc. MIC2164/-2/-3/C Ordering Information Switching (1) Part Number Voltage Accuracy Junction Temperature Range Package Lead Finish Frequency MIC2164YMM Adjustable 300kHz 1% 40 to +125C 10-pin MSOP Pb-Free MIC2164-2YMM Adjustable 600kHz 1% 40 to +125C 10-pin MSOP Pb-Free MIC2164-3YMM Adjustable 1MHz 1% 40 to +125C 10-pin MSOP Pb-Free MIC2164CYMM Adjustable 270kHz 3% 40 to +125C 10-pin MSOP Pb-Free Note: 1. Other voltages are available. Contact Micrel for details. Pin Configuration 10-Pin MSOP (MM) Pin Description Pin Number Pin Name Pin Function High-Side N-MOSFET Drain Connection (input): Power to the drain of the external high-side N-channel 1 HSD MOSFET. The HSD operating voltage range is from 3V to 28V. Input capacitors between HSD and the power ground (PGND) are required. Enable (input): A logic level control of the output. The EN pin is CMOS-compatible. Logic high or 2 EN floating = enable, logic low = shutdown. In the off state, supply current of the device is greatly reduced (typically 0.8mA). Feedback (input): Input to the transconductance amplifier of the control loop. The FB pin is regulated to 3 FB 0.8V. A resistor divider connecting the feedback to the output is used to adjust the desired output voltage. Signal ground. GND is the ground path for the device input voltage VIN and the control circuitry. The 4 GND loop for the signal ground should be separate from the power ground (PGND) loop. Input Voltage (input): Power to the internal reference and control sections of the MIC2164/-2/-3. The IN 5 IN operating voltage range is from 3V to 5.5V. A 1F and 0.1F ceramic capacitors from IN to GND are recommended for clean operation. Low-Side Drive (output): High-current driver output for external low-side MOSFET. The DL driving 6 DL voltage swings from ground-to-IN. Power Ground. PGND is the ground path for the MIC2164/-2/-3 buck converter power stage. The PGND pin connects to the sources of low-side N-Channel MOSFETs, the negative terminals of input 7 PGND capacitors, and the negative terminals of output capacitors. The loop for the power ground should be as small as possible and separate from the Signal ground (GND) loop. High-Side Drive (output): High-current driver output for external high-side MOSFET. The DH driving voltage is floating on the switch node voltage (LX). It swings from ground to VIN minus the diode drop. 8 DH Adding a small resistor between DH pin and the gate of the high-side N-channel MOSFETs can slow down the turn-on and turn-off time of the MOSFETs. February 12, 2015 Revision 4.1 2