MIC59300 Ultra High Speed 3A LDO General Description Features The MIC59300 is a high-bandwidth, low-dropout, 3A linear voltage regulator ideal for powering core voltages of lowpower microprocessors. The MIC59300 implements a dual supply configuration allowing for a very low output impedance and a very fast transient response. The MIC59300 requires a bias input supply and a main input supply, allowing for ultra-low input voltages on the main supply rail. The device operates from an input supply of 1.0V to 3.8V and bias supply between 3V and 5.5V. The MIC59300 offers fixed output voltages and adjustable output voltages down to 0.5V. The MIC59300 requires a minimum output capacitance for stability, working optimally with small ceramic capacitors. The MIC59300 is available in a 5-pin TO-263 and an 8-pin EPAD SOIC package and its junction temperature range is –40°C to +125°C. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • Input voltage range: – VIN = 1.0V to 3.8V – VBIAS = 3.0V to 5.5V • Stable with 1µF ceramic capacitor • ±1% initial tolerance • Maximum dropout voltage of 500mV over temperature • Adjustable output voltage down to 0.5V • Ultra fast transient response • Excellent line and load regulation specifications • Logic controlled shutdown option • Thermal shutdown and current limit protection • Junction temperature range: –40°C to +125°C • TO-263 & 8-pin EPAD SOIC • Pin Compatible Upgrade to MIC49300 Applications • • • • • • • Telecommunications processors Graphics processors Computer peripheral cards Logic IC power supply SMPS post regulators Microprocessors Digital TV’s _________________________________________________________________________________________________________ Typical Application MIC59300YME 3, 6 VIN CIN=1µF (Ceramic) VOUT 4, 5 VOUT R1 VBIAS 2 EN 1 CBIAS=1µF (Ceramic) VIN VBIAS ADJ EN GND 8 EP COUT=1µF (Ceramic) 7 R2 9 Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com January 2009 M9999-010809-A Micrel, Inc. MIC59300 Ordering Information Part Number Voltage(1) Junction Temperature Range Package Lead Finish MIC59300-1.2YME 1.2V –40°C to +125°C 8-Pin EPAD SOIC RoHS Compliant MIC59300YME Adj. –40°C to +125°C 8-Pin EPAD SOIC RoHS Compliant MIC59300-1.2WU 1.2V –40°C to +125°C 5-Pin TO-263 RoHS Compliant MIC59300WU Adj. –40°C to +125°C 5-Pin TO-263 RoHS Compliant Note: 1. Other Voltage available. Contact Micrel for detail. Pin Configuration 8-Pin EPAD SOIC MIC59300YME 8-Pin EPAD SOIC MIC59300-1.2YME VOUT VOUT VIN VIN GND GND VBIAS VBIAS ADJ EN 5-Pin TO-263 MIC59300WU January 2009 5-Pin TO-263 MIC59300-1.2WU 2 M9999-010809-A Micrel, Inc. MIC59300 Pin Description Pin Number Pin Number SOIC-8 TO-263 1 1 (fixed) EN 2 2 VBIAS 3, 6 4 VIN 4, 5 5 VOUT 7 (adjustable) 1 (adjustable) ADJ 7 (fixed) Pin Name SENSE 8 3 GND 9 6 EP January 2009 Pin Function Enable (Input): CMOS compatible input. Logic high = enable, logic low = shutdown. Input bias voltage for powering all circuitry on the regulator with the exception of the output power device. Input voltage needed for the output power device. Regulator Output. Adjustable regulator feedback input. Connect to resistor voltage divider. Connect to VOUT for fixed voltage options. Ground. Exposed Pad: Connect to ground pin. 3 M9999-010809-A Micrel, Inc. MIC59300 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) ........................................ –0.3V to +4V Bias Supply Voltage (VBIAS)............................. –0.3V to +6V Enable Input Voltage (VEN)............................. –0.3V to VBIAS Power Dissipation .....................................Internally Limited Storage Temperature (Ts) .........................–65°C to +150°C ESD Rating(3) .................................................................. 3kV Supply Voltage (VIN)............................................ 1V to 3.8V Bias Supply Voltage (VBIAS)................................. 3V to 5.5V Enable Input Voltage (VEN).................................. 0V to VBIAS Junction Temperature (TJ) ..................–40°C ≤ TJ ≤ +125°C Package Thermal Resistance EPAD SOIC (θJA) ...............................................41°C/W TO-263 (θJC)………………………………… ......6.3°C/W Electrical Characteristics(4) TA = 25°C with VBIAS = VOUT + 2.2V; VIN = VOUT + 1V; ILOAD = 10mA; bold values indicate 0°C ≤ TJ ≤ 85°C, unless otherwise specified. Parameter Condition Max Units Output Voltage Accuracy (Fixed Voltage Options) Room temperature 1 1 % Over temperature range 2 2 % Line Regulation (VIN) VIN = VOUT + 1V to 3.8V 0.0015 0.1 %/V Line Regulation (VBIAS) VBIAS = 3V to 5.5V (VOUT < 0.8V) VBIAS = VOUT + 2.2V to 5.5V (VOUT ≥ 0.8V) 0.035 0.3 %/V Feedback Voltage (Adjustable Output Voltage) Room temperature 0.495 0.5 0.505 V Over temperature range 0.490 0.5 0.510 V Output Voltage Load Regulation IL = 10mA to 3A (SOIC) 0.15 0.5 % IL = 10mA to 3A (TO-263) 0.15 0.5 % IL = 1.5A 93 250 mV IL = 3A (SOIC) 205 400 mV VIN – VOUT; Dropout Voltage Min Typ IL = 3A (TO-263) 205 500 mV VBIAS – VOUT; Dropout Voltage IL = 3A 0.91 2.1 V VBIAS supply current VEN = 2V, IL = 100mA VEN = 2V, IL = 3A 2 30 7.5 150 mA mA VBIAS shutdown current VEN = 0V 0.1 1 µA VIN shutdown current VEN = 0V 0.1 1 µA FB bias current Adj only 0.02 1 µA UVLO VBIAS rising 2.85 3.0 2.7 Hysteresis Current Limit 100 V mV VOUT = 0V 3.3 4.7 9.0 A Regulator enable Regulator shutdown 1.6 0.85 0.75 0.3 V V 0.002 1 µA Enable Input Enable Input Threshold Enable Pin Input Current Independent of state AC Response Large signal bandwidth 1 MHz PSRR (BIAS) at 10kHz VBIAS = 3.3V, IOUT = 1.5A 45 dB PSRR (IN) at 10kHz VIN = VOUT + 1V, IOUT = 1.5A VIN = VOUT + 0.3V, IOUT = 1.5A 65 55 dB dB 145 °C Thermal Shutdown January 2009 4 M9999-010809-A Micrel, Inc. MIC59300 Thermal Shutdown Hysteresis 10 Turn-on Time 90 °C 300 µs Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF. 4. Specification for packaged product only. January 2009 5 M9999-010809-A Micrel, Inc. MIC59300 Typical Characteristics BIAS CURRENT (mA) 35 30 25 20 15 10 VBIAS = 3V 5 VIN = 1.5V 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 0 VOUT = 0.5V OUTPUT CURRENT (A) January 2009 1.5 VBIAS = 3.3V VIN = 1.5V VOUT = 1V =3.0A 120 VOUT = 0.5V OUT 40 30 I =1.5A OUT 20 10 IOUT=100mA 0.504 1.2 1.1 VIN = 1.8V VOUT = 1V 6 VIN = 1.5V TEMPERATURE (°C) 1.3 3.5 4 4.5 5 BIAS VOLTAGE (V) I 50 0 Ground Current vs. Bias Voltage 1 VBIAS = 3V 60 120 BIAS CURRENT (mA) 70 100 80 60 Bias Current vs. Temperature 1.4 0.9 3 40 -40 120 80 Load Regulation OUTPUT CURRENT (A) Bias Current vs. Output Current VOUT = 3.45V IOUT = 3A 100 5 VIN = 3.8V 0.2 80 2 3 4 BIAS VOLTAGE (V) 0.4 60 1 0.6 -40 0 0 VOUT = 2.5V 0.8 TEMPERATURE (°C) FEEDBACK VOLTAGE (V) VIN = 3V 0.5 1 0 3 1 3 Dropout Voltage vs. Temperature (VBIAS) TEMPERATURE (°C) 2.7 1.5 0 3A 2 1.010 1.009 1.008 1.007 1.006 1.005 1.004 1.003 1.002 1.001 1.000 0.999 0.998 0.997 0.996 0.995 0.3 2.5 OUTPUT VOLTAGE (V) 10mA GROUND CURRENT (mA) OUTPUT VOLTAGE (V) 3 Dropout Characteristics (VBIAS) 100 OUTPUT CURRENT (A) 2.4 -40 0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 IOUT = 3A VOUT = 1V 1.8 2.1 2.4 2.7 OUTPUT CURRENT (A) 20 50 0 0 VOUT = 3.45V 60 VOUT = 2.5V VBIAS = 5.5V 100 2.1 0.2 150 40 VIN = 3V 200 1.8 0.4 250 20 0.6 1.2 300 1.5 0.8 Dropout Voltage vs. Temperature (VIN) 1.2 1 1000 40 350 0.1 1 10 100 FREQUENCY (kHz) VBIAS = 3.3V 20 0 0.01 1000 Dropout Voltage (VBIAS) 1.2 IOUT = 1.5A 0 0.1 1 10 100 FREQUENCY (kHz) VOUT = 1V 0 10 IOUT = 1.5A VIN = 1.8V -20 20 VOUT = 1V 0 0.01 30 VBIAS = 3.3V -20 10 VIN = 1.8V 40 0.9 30 VBIAS = 3.3V 50 0.6 40 0 60 50 220 200 180 160 140 120 100 80 60 40 20 0 1.5 Dropout Voltage (VIN) -20 70 60 DROPOUT VOLTAGE (mV) 70 PSRR (dB) 80 20 DROPOUT VOLTAGE (V) 90 80 DROPOUT VOLTAGE (mV) PSRR (dB) 90 Power Supply Rejection Ratio (VBIAS) DROPOUT VOLTAGE (V) Power Supply Rejection Ratio (VIN) 5.5 Feedback Voltage vs. Input Voltage 0.503 0.502 0.501 0.500 0.499 0.498 0.497 0.496 1.5 VBIAS = 3.3V VOUT = 1V 1.9 2.3 2.7 3.1 3.5 INPUT VOLTAGE (V) 3.9 M9999-010809-A Micrel, Inc. MIC59300 Typical Characteristics (continued) 0.51 January 2009 ENABLE THRESHOLD (V) VBIAS = 3.3V TEMPERATURE (°C) 7 120 VIN = 1.5V 100 5.5 0.492 0.49 80 3.5 4 4.5 5 BIAS VOLTAGE (V) 0.494 60 0.495 3 VOUT = 1V 0.496 40 VIN = 1.5V 0.496 0.5 0.498 20 0.498 0.497 0.504 0.502 0 0.500 0.499 1.2 0.506 -20 0.502 0.501 Feedback Voltage vs. Temperature 0.508 -40 0.504 0.503 FEEDBACK VOLTAGE (V) FEEDBACK VOLTAGE (V) 0.505 Feedback Voltage vs. Bias Voltage Enable Threshold vs. Bias Voltage 1 0.8 0.6 0.4 0.2 0 3 VIN = 1.8V VOUT = 1V 3.5 4 4.5 5 BIAS VOLTAGE (V) 5.5 M9999-010809-A Micrel, Inc. MIC59300 Functional Characteristics January 2009 8 M9999-010809-A Micrel, Inc. MIC59300 Functional Diagram VBIAS VIN EN Enable Bandgap ADJ Ilimit VOUT MIC59300 (Adj) Block Diagram VBIAS VIN Enable EN SENSE Bandgap R1 R2 Ilimit VOUT MIC59300 (Fixed) Block Diagram January 2009 9 M9999-010809-A Micrel, Inc. MIC59300 capacitors change value by as much as 50% and 60% respectively over their operating temperature ranges. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than an X7R ceramic or a tantalum capacitor to ensure the same capacitance value over the operating temperature range. Tantalum capacitors have a very stable dielectric (10% over their operating temperature range) and can also be used with this device. Application Information The MIC59300 is an ultra-high performance, low-dropout linear regulator designed for high current applications requiring a fast transient response. The MIC59300 utilizes two input supplies, significantly reducing dropout voltage, making it perfect for low-voltage, DC-to-DC conversion. The MIC59300 requires a minimum number of external components, and as a μCap regulator, the output is tolerant of virtually any type of capacitor, including ceramic type and tantalum type capacitors. The MIC59300 regulator is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. Input Capacitor An input capacitor of 1μF or greater is recommended when the device is more than 4 inches away from the bulk supply capacitance, or when the supply is a battery. Small, surface-mount, ceramic chip capacitors can be used for the bypassing. The capacitor should be placed within 1 inch of the device for optimal performance. Larger values will help to improve ripple rejection by bypassing the input to the regulator, further improving the integrity of the output voltage. Bias Supply Voltage VBIAS, requiring relatively light current, provides power to the control portion of the MIC59300. VBIAS requires approximately 30mA for a 3A load current. Dropout conditions require higher currents. Most of the biasing current is used to supply the base current to the pass transistor. The bias voltage allows the pass element to be driven into saturation, reducing the dropout to 205mV at a 3A load current. Bypassing on the bias pin is recommended to improve performance of the regulator during line and load transients. Small ceramic capacitors from VBIAS-to-ground help reduce high frequency noise from being injected into the control circuitry from the bias rail and constitute good design practice. Good bypass techniques typically include one larger capacitor such as 1μF ceramic and smaller valued capacitors such as 0.01μF or 0.001μF in parallel with that larger capacitor to decouple the bias supply. The VBIAS input voltage must be 2.1V above the output voltage with a minimum VBIAS input voltage of 3V. Thermal Design Linear regulators are simple to use. The most complicated design parameters to consider are thermal characteristics. Thermal design requires the following application-specific parameters: • Maximum ambient temperature (TA) • • Output voltage (VOUT) • Input voltage (VIN) • Ground current (IGND) First, calculate the power dissipation (PD) of the regulator from these numbers and the device parameters from this datasheet. Input Supply Voltage VIN provides the high current to the collector of the pass transistor. The minimum input voltage is 1.0V, allowing conversion from low voltage supplies. PD = VIN × I IN + VBIAS × I BIAS − VOUT × I OUT The input current will be less than the output current at high output currents as the load increases. The bias current is a sum of base drive and ground current. Ground current is constant over load current. Then the heat sink thermal resistance is determined with this formula: Output Capacitor The MIC59300 requires a minimum of output capacitance to maintain stability. However, proper capacitor selection is important to ensure desired transient response. The MIC59300 is specifically designed to be stable with virtually any capacitance value and ESR. A 1μF ceramic chip capacitor should satisfy most applications. Output capacitance can be increased without bound. See the “Functional Characteristics” for examples of load transient response. X7R dielectric ceramic capacitors are recommended because of their temperature performance. X7R-type capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ceramic capacitors. Z5U and Y5V dielectric January 2009 Output current (IOUT) ⎛ TJ ( MAX ) − T A ⎞ ⎟ − (θ JC + θ CS ) ⎟ PD ⎝ ⎠ θ SA = ⎜⎜ The heat sink may be significantly reduced in applications where the maximum input voltage is known and large compared with the dropout voltage. Use a series input resistor to drop excessive voltage and distribute the heat between this resistor and the regulator. The low-dropout properties of the MIC59300 allow significant reductions in regulator power dissipation and the associated heat sink without compromising performance. When this technique is employed, a 10 M9999-010809-A Micrel, Inc. MIC59300 capacitor of at least 1μF is needed directly between the input and regulator ground. Refer to “Application Note 9” (http://www.micrel.com/_PDF/App-Notes/an-9.pdf) for further details and examples on thermal design and heat sink specification. ⎛V ⎞ R 1 = R 2 × ⎜ OUT − 1⎟ ⎝ 0.5 ⎠ where VOUT is the desired output voltage. Enable An active high enable input (EN) allows on-off control of the regulator. Current drain reduces to “zero” when the device is shutdown, with only microamperes of leakage current. The EN input has CMOS compatible thresholds for simple logic interfacing. EN may be directly tied to VBIAS and pulled up to the maximum supply voltage. Minimum Load Current The MIC59300, unlike most other high current regulators, does not require a minimum load to maintain output voltage regulation. Adjustable Regulator Design The MIC59300 adjustable version allows programming the output voltage anywhere between 0.5Vand 3.3V. Two resistors are used. The resistor value between VOUT and the adjust pin should not exceed 10kΩ. Larger values can cause instability. The resistor values are calculated by: January 2009 EPad The exposed pad on the bottom of the SOIC part must be connected to ground. 11 M9999-010809-A Micrel, Inc. MIC59300 U1 MIC59300YME J1 VIN 1V to 3.8V C1 1uF/6.3V 3 6 VIN VIN VOUT VOUT C2 1uF/6.3V R1 1K C4 OPEN J2 GND 2 VBIAS 1 EN ADJ C3 1uF/6.3V Option for Fixed VOUT R1 = 0 Remove all Jumpers from JP2 J5 GND 7 1 J3 VBIAS 3V to 5.5V J4 VOUT 4 5 2 GND EP 9 R2 1K 8 3 JP1 6 8 7 D 5 C 4 B 3 R5 383 2 JP2 R4 499 1 A R3 698 JP2 = Voltages Selector A VOUT = 1.0V B VOUT = 1.2V C VOUT = 1.5V D VOUT = 1.8V Bill of Materials Item Part Number C1,C2 C1608X5R0J105K C3 GRM188R60J105KA01D 0603D105KAT2A Manufacturer TDK (1) Description Qty. 1uF Ceramic Capacitor X5R 0603 6.3V 3 Open 1 Murata(2) AVX(3) C4 (4) R1,R2 CRCW06031K00FKXX Vishay 1kΩ 1% 0603 Resistor 2 R3 CRCW0603698RFKXX Vishay(4) 698Ω 1% 0603 Resistor 1 R4 CRCW0603499RFKXX Vishay(4) 499Ω 1% 0603 Resistor 1 R5 CRCW0603383RFKXX (4) 383Ω 1% 0603 Resistor 1 U1 MIC59300YME Ultra High Speed 3A LDO 1 Vishay Micrel, Inc.(5) Notes: 1. TDK: www.tdk.com 2. Murata Tel: www.murata.com 3. AVX Tel: www.avx.com 4. Vishay Tel: www.vishay.com 5. Micrel, Inc.: www.micrel.com January 2009 12 M9999-010809-A Micrel, Inc. MIC59300 PCB Layout Recommendations Top Layer Bottom Layer January 2009 13 M9999-010809-A Micrel, Inc. MIC59300 Package Information 8-Pin EPAD SOIC (ME) January 2009 14 M9999-010809-A Micrel, Inc. MIC59300 5-Pin TO-263 (WU) MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2009 Micrel, Incorporated. January 2009 15 M9999-010809-A