MIC2164CYMM

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 control. The MIC2164/-2/-3/C are the first products in the new Hyper Speed Control™ family of buck controllers introduced by Micrel. The MIC2164/-2/-3/C controllers operate over an input supply range of 3V to 28V, and are independent of the IC supply voltage. The devices are capable of supplying 25A output current. While the MIC2164 operates at 300kHz, the MIC2164-2 operates at 600kHz, and the MIC2164-3 operates at 1MHz. A unique Hyper Speed Control architecture allows for ultra-fast transient response while reducing the output capacitance and also makes High VIN/Low VOUT operation possible. The MIC2164/-2/-3/C controllers utilizes an architecture which is adaptive TON ripple controlled. A UVLO feature is provided to ensure proper operation under power-sag conditions to prevent the external power MOSFET from overheating. A soft start feature is provided to reduce the inrush current. Foldback current limit and “hiccup” mode short-circuit protection ensure FET and load protection. The MIC2164/-2/-3/C controllers are available in a 10-pin MSOP (MAX1954A-compatible) package with a junction operating range from –40°C to +125°C. Datasheets and support documentation are available on Micrel’s web site at: www.micrel.com. Hyper Speed Control™ Features  Hyper Speed Control architecture enables high delta V operation (VHSD = 28V and VOUT = 0.8V) and smaller output capacitors than competitors  3V to 28V input voltage  Any Capacitor™ stable (Zero ESR to high ESR)  25A output current capability  300kHz/600kHz/1MHz switching frequency  Adaptive on-time mode control  Adjustable output from 0.8V to 5.5V with ±1% (MIC2164/-2/-3) or ±3% (MIC2164C) FB accuracy  Up to 95% efficiency  Foldback current-limit, “hiccup” mode short-circuit protection, thermal shutdown, and safe pre-bias startup  6ms Internal soft start  –40°C to +125°C junction temperature range  Available in 10-pin MSOP package Applications  Set-top box, gateways and routers  Printers, scanners, graphic cards and video cards  Telecommunication, PCs and servers Typical Application MIC2164 12V to 3.3V Efficiency 100 95 EFFICIENCY (%) 90 85 80 75 70 65 60 55 VIN=5V 50 MIC2164/-2/-3/C Synchronous Controllers Featuring Adaptive On-Time Control 0 4 8 12 16 20 OUTPUT CURRENT (A) 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 • http://www.micrel.com February 12, 2015 Revision 4.1 Micrel, Inc. MIC2164/-2/-3/C Ordering Information Part Number Voltage(1) Switching Frequency Accuracy Junction Temperature Range Package Lead Finish MIC2164YMM Adjustable 300kHz ±1% –40° to +125°C 10-pin MSOP Pb-Free MIC2164-2YMM Adjustable 600kHz ±1% –40° to +125°C 10-pin MSOP Pb-Free MIC2164-3YMM Adjustable 1MHz ±1% –40° to +125°C 10-pin MSOP Pb-Free MIC2164CYMM Adjustable 270kHz ±3% –40° to +125°C 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 1 HSD High-Side N-MOSFET Drain Connection (input): Power to the drain of the external high-side N-channel MOSFET. The HSD operating voltage range is from 3V to 28V. Input capacitors between HSD and the power ground (PGND) are required. 2 EN Enable (input): A logic level control of the output. The EN pin is CMOS-compatible. Logic high or floating = enable, logic low = shutdown. In the off state, supply current of the device is greatly reduced (typically 0.8mA). 3 FB 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 adjust the desired output voltage. 4 GND 5 IN Input Voltage (input): Power to the internal reference and control sections of the MIC2164/-2/-3. The IN operating voltage range is from 3V to 5.5V. A 1µF and 0.1µF ceramic capacitors from IN to GND are recommended for clean operation. 6 DL Low-Side Drive (output): High-current driver output for external low-side MOSFET. The DL driving voltage swings from ground-to-IN. 7 8 February 12, 2015 PGND DH Pin Function Signal ground. GND is the ground path for the device input voltage VIN and the control circuitry. The loop for the signal ground should be separate from the power ground (PGND) loop. 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 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. 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. 2 Revision 4.1 Micrel, Inc. MIC2164/-2/-3/C Pin Description (Continued) Pin Number Pin Name 9 10 February 12, 2015 LX BST Pin Function Switch Node and Current Sense input: High current output driver return. The LX pin connects directly to the switch node. Due to the high speed switching on this pin, the LX pin should be routed away from sensitive nodes. LX pin also senses the current by monitoring the voltage across the low-side MOSFET during OFF time. In order to sense the current accurately, connect the low-side MOSFET drain to LX using a Kelvin connection. Boost (output): Bootstrapped voltage to the high-side N-channel MOSFET driver. A Schottky diode is connected between the IN pin and the BST pin. A boost capacitor of 0.1μF is connected between the BST pin and the LX pin. Adding a small resistor in series with the boost capacitor can slow down the turn-on time of high-side N-Channel MOSFETs. 3 Revision 4.1 Micrel, Inc. MIC2164/-2/-3/C Absolute Maximum Ratings(2) Operating Ratings(3) IN, FB, EN to GND .......................................... –0.3V to +6V BST to LX ........................................................ –0.3V to +6V BST to GND .................................................. –0.3V to +37V DH to LX ............................................ –0.3V to (VBST + 0.3V) DL, COMP to GND .............................. –0.3V to (VIN + 0.3V) HSD to GND .................................................... –0.3V to 31V PGND to GND .............................................. –0.3V to +0.3V Junction Temperature .............................................. +150°C Storage Temperature (TS) ......................... –65°C to +150°C Lead Temperature (soldering, 10sec) ........................ 260°C Input Voltage (VIN) ............................................ 3.0V to 5.5V Supply Voltage (VHSD) ....................................... 3.0V to 28V Operating Temperature Range ................. –40°C to +125°C Junction Temperature (TJ) ........................ –40°C to +125°C Junction Thermal Resistance MSOP (θJA) ......................................................... 130.5°C/W Continuous Power Dissipation (TA = 70°C).............. 421mW (derate 5.6mW/°C above 70°C) Electrical Characteristics(5) VBST – VLX = 5V; TA = 25°C, bold values indicate –40°C≤ TA ≤ +125°C, unless noted. Parameter Condition Min. Typ. Max. Units General Operating Input Voltage (VIN)(6) 3.0 5.5 V HSD Voltage Range (VHSD) 3.0 28 V Quiescent Supply Current (VFB = 1.5V, output switching but excluding external MOSFET gate current) 1.4 3.0 mA Standby Supply Current(7) VIN = VBST = 5.5V, VHSD = 28, LX = unconnected, EN = GND 0.8 2 mA 2.7 3 V 2.4 Under-Voltage Lockout Trip Level UVLO Hysteresis 50 mV DC-DC Controller Output-Voltage Adjust Range (VOUT) 0.8 5.5 0°C ≤ TJ ≤ 85°C -1 1 −40°C ≤ TJ ≤ 125°C -2 2 TJ = 25°C (MIC2164C) -3 3 V Error Amplifier FB Regulation Voltage FB Input Leakage Current Current-Limit Threshold 5 500 VFB = 0.8V 103 130 162 VFB = 0V 19 48 77 VFB = 0.8V (MIC2164C) 95 130 170 VFB = 0V (MIC2164C) 15 48 80 % nA mV Notes: 2. Exceeding the absolute maximum ratings may damage the device. 3. The device is not guaranteed to function outside its operating ratings. 4. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF. 5. Specification for packaged product only. 6. The application is fully functional at low IN (supply of the control section) if the external MOSFETs have enough low voltage VTH. 7. The current will come only from the internal 100kΩ pull-up resistor sitting on the EN Input and tied to IN. 8. Measured in test mode. 9. Measured at DH. The maximum duty cycle is limited by the fixed mandatory off time TOFF of 363ns typical. February 12, 2015 4 Revision 4.1 Micrel, Inc. MIC2164/-2/-3/C Electrical Characteristics(5) (Continued) VBST – VLX = 5V; TA = 25°C, bold values indicate –40°C≤ TA ≤ +125°C, unless noted. Parameter Condition Min. Typ. Max. Units Soft-Start Soft-Start Period 6 ms Oscillator Switching Frequency(8) 0.202 0.225 0.45 0.75 MIC2164C MIC2164 MIC2164-2 MIC2164-3 0.27 0.3 0.6 1 0.338 0.375 0.75 1.25 MHz Maximum Duty Cycle MIC2164/ MIC2164C MIC2164-2 MIC2164-3 87 74 66 % Minimum Duty Cycle Measured at DH, VFB = 1V 0 % (9) FET Drives DH, DL Output Low Voltage ISINK = 10mA DH, DL Output High Voltage ISOURCE = 10mA 0.1 VIN − 0.1V or VBST − 0.1V V V DH On-Resistance, High State 2.1 3.3 Ω DH On-Resistance, Low State 1.8 3.3 Ω DL On-Resistance, High State 1.8 3.3 Ω DL On-Resistance, Low State 1.2 2.3 Ω LX Leakage Current VLX = 28V, VIN = 5.5V,VBST = 33.5V 50 µA HSD Leakage Current VLX = 28V, VIN = 5.5V,VBST = 33.5V 20 µA Thermal Protection Over-Temperature Shutdown 155 °C Over-Temperature Shutdown Hysteresis 10 °C 0.8 V Shutdown Control EN Logic Level Low 3V < VIN