MIC5315 Low Voltage Dual 300mA LDO with Voltage Select General Description Features The MIC5315 is a high performance, dual low input voltage, low dropout regulator with voltage select. Major features include two 300mA LDOs, input voltage down to 1.7V, ultra low drop out of 85mV at full load, and voltage select. Each LDO has its own low voltage input for system flexibility. The low input voltages and low drop out operation provides high efficiency by reducing the input to output voltage step which minimizes the regulator power loss. Voltage select is incorporated into the second output, which reduces the output voltage to a lower level to further save power while in stand-by mode. Ideal for battery operated applications; the MIC5315 offers 1% accuracy and low ground current to increase light load efficiency. The MIC5315 can also be put into a zero-offmode current state, drawing virtually no current when disabled. The MIC5315 is available in fixed output voltages in the 10-pin 2mm x 2mm Thin MLF® leadless package. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • • • • • • • • • 300mA output current for each LDO Dual low voltage regulator inputs: 1.7V to 5.5V Low output voltage range: 0.8V to 2.0V Ultra-low dropout voltage of 85mV @ 300mA Voltage select function Stable with 1µF ceramic output capacitors Very fast transient response Thermal shutdown and current limit protection Tiny 10-pin 2mm x 2mm Thin MLF® package Applications • • • • • • Mobile Phones GPS and Navigation Devices Portable Media Players Digital still and video cameras PDAs Portable electronics ___________________________________________________________________________________________________________ Typical Application VI/O MIC5315-xxyYMT MIC23031-1.8YMT DC-to-DC Converter VBAT VIN1 VOUT1 VCORE1 VOUT2 VCORE2 VIN2 VBIAS CIN 1µF CBIAS 1µF /VSC2 EN1 CBYP 1µF 1µF EN2 GND 10nF µProcessor MLF and MicroLeadFrame are registered trademarks of Amkor Technology, 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 July 2008 M9999-070208-A Micrel, Inc. MIC5315 Ordering Information Part Number Manufacturing Part Number Marking(1) VOUT1(2) VOUT2(2) Junction Temp. Range Package(3) MIC5315-1.5/1.2/1.0YMT MIC5315-F4CYMT F4C 1.5V 1.2V/1.0V –40°C to +125°C 10-Pin 2mm x 2mm Thin MLF® MIC5315-1.5/1.3/1.0YMT MIC5315-F5CYMT F5C 1.5V 1.3V/1.0V –40°C to +125°C 10-Pin 2mm x 2mm Thin MLF® MIC5315-1.8/1.6/1.1YMT MIC5315-GW3YMT GW3 1.8V 1.6V/1.1V –40°C to +125°C 10-Pin 2mm x 2mm Thin MLF® MIC5315-1.8/1.8/1.0YMT MIC5315-GGCYMT GGC 1.8V 1.8V/1.0V –40°C to +125°C 10-Pin 2mm x 2mm Thin MLF® Notes: 1. Pin 1 identifier = ▲. 2. For other voltage option, contact Micrel Marketing for details 3. MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. ® Pin Configuration VIN1 1 10 VOUT1 VIN2 2 9 VOUT2 VBIAS 3 8 /VSC2 EN1 4 7 CBYP EN2 5 6 GND ® 10-Pin 2mm × 2mm Thin MLF (MT) Pin Description Pin Number Pin Name 1 VIN1 Voltage Input for LDO1. 2 VIN2 Voltage Input for LDO2. 3 VBIAS 4 EN1 Enable Input for LDO1. Active High Input. Logic High = On; Logic Low = Off; Do not leave floating. 5 EN2 Enable Input for LDO2. Active High Input. Logic High = On; Logic Low = Off; Do not leave floating. 6 GND Ground. 7 CBYP Bypass: Connect a capacitor to ground to improve output noise and PSRR. 8 /VSC2 Voltage Select Input for LDO2. Active Low Input. Logic High = Full Output Voltage; Logic Low = Low Output Voltage. Do not leave floating. 9 VOUT2 Output of regulator 2. 10 VOUT1 Output of regulator 1. July 2008 Pin Function Bias Input Voltage. 2 M9999-070208-A Micrel, Inc. MIC5315 Absolute Maximum Ratings(1) Operating Ratings(2) Main Input Voltage (VIN1, VIN2)..........................0V to VBIAS Bias Supply Voltage (VBIAS)...............................0V to +6V Enable Input Voltage (VEN1, VEN2) ....................0V to VBIAS Voltage Select Input Voltage (V/VSC2) ...............0V to VBIAS Power Dissipation ...............................Internally Limited(3) Lead Temperature (soldering, 3sec.)......................260°C Storage Temperature (Ts) ..................... –65°C to +150°C ESD Rating(4) ...............................................................2kV Supply voltage (VIN1, VIN2)...........................+1.7V to VBIAS Bias Supply Voltage (VBIAS) ........................ 2.5V to +5.5V Enable Input Voltage (VEN1, VEN2) ................... 0V to VBIAS Voltage Select Input Voltage (V/VSC2)............... 0V to VBIAS Junction Temperature (TJ) .....................–40°C to +125°C Junction Thermal Resistance 2mm x 2mm Thin MLF-10 (θJA).............................80°C/W Electrical Characteristics(4) VBIAS = 3.6V; VIN1= VIN2 = VOUT (Highest of two regulators) + 1V; CBIAS=COUT= 1.0µF, CBYP=0.01µF, IOUT = 100µA; TJ = 25ºC, bold values indicate –40ºC to + 125ºC; unless noted. Parameter Condition Min Output Voltage Accuracy Variation from nominal VOUT1 & VOUT2 Select Mode Output Voltage Accuracy Typ Max Units –1.0 +1.0 % Variation from nominal VOUT1 & VOUT2 –2.0 +2.0 % VOUT2, V/VSC2 = Logic Low -3.0 +3.0 % VOUT2, V/VSC2 = Logic Low -4.0 +4.0 % VIN Line Regulation VIN = VOUT +1V to 5.5V, VBIAS = 5.5V 0.02 0.3 %/V VBIAS Line Regulation VBIAS = 3.6V to 5.5V, VIN = VOUT +1V 0.02 0.3 %/V Load Regulation IOUT = 100µA to 300mA 0.4 1.0 % Dropout Voltage IOUT = 150mA 40 100 mV IOUT = 300mA 85 200 mV VEN1 = High; VEN2 = Low; IOUT1 = 100µA to 300mA 7 12 µA VEN1 = Low; VEN2 = High; IOUT2 = 100µA to 300mA 7 12 µA Ground Pin Current VBIAS IOUT1 = IOUT2 = 100µA to 300mA 30 46 µA Ground Pin Current in Shutdown VEN ≤ 0.2V 0.01 1.0 µA VIN Ripple Rejection f = 1kHz; COUT = 1.0µF; CBYP = 0.01µF 65 dB f = 20kHz; COUT = 1.0µF; CBYP = 0.01µF 40 dB 550 mA 30 µVRMS Ground Pin Current VIN1,VIN2 Current Limit VOUT = 0V 350 Output Voltage Noise COUT=1µF, CBYP=0.01µF, 10Hz to 100kHz Enable Enable Input Voltage Logic Low 0.2 Logic High Enable Input Current Turn-on Time July 2008 V V 1.2 VIL ≤ 0.2V 0.02 1 µA VIH ≥ 1.2V 0.2 1 µA COUT = 1µF; CBYP = 0.01µF 150 300 µs 3 M9999-070208-A Micrel, Inc. MIC5315 Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = TJ(max) – TA) / θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. 4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF. 5. Specification for packaged product only. July 2008 4 M9999-070208-A Micrel, Inc. MIC5315 Typical Characteristics Power Supply Rejection Ratio (V IN) Power Supply Rejection Ratio (V BIAS) 150mA 16 150mA Ground Current (V IN) vs. Temperature 15 14 300mA 13 VIN = VOUT +1V 300mA VIN = VOUT +1V VOUT = 1.8V COUT = 1µF CBYP = 10nF VIN = VOUT +1V VOUT = 1.8V COUT = 1µF CBYP = 10nF 0 10 16.0 100 1k 10k 100k FREQUENCY (Hz) 1M Ground Current (V IN) vs. Output Current VIN = VOUT +1V VBIAS = 3.6V VOUT1 = 1.5V VOUT2 = 1.2V COUT = 1µF CBYP = 10nF 15.5 15.0 14.5 14.0 13.5 0 10 30 120 100 Dropout Voltage vs. Temperature 80 40 VOUT = 1.5V COUT = 1µF 150mA 27 24 0 0.10 0.09 10mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) Output Voltage vs. Output Current 1.65 0 0 2.0 1.8 1.0 0.8 July 2008 50 100 150 200 250 300 OUTPUT CURRENT (mA) Ground Current (V IN) vs. Input Voltage 300mA 10mA VBIAS = 3.6V VOUT1 = 1.5V VOUT2 = 1.2V COUT = 1µF CBYP = 10nF 12 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE (V) 1.70 Output Voltage vs. Temperature 1.65 1.60 1.50 VBIAS = 3.6V VOUT = 1.8V COUT = 1µF 0.02 0.01 1.2 1.30 0 Dropout Voltage vs. Load Current 13 1.45 1.50 1.35 50 100 150 200 250 300 OUTPUT CURRENT (mA) 14 0.05 0.04 1.55 VIN = VOUT +1V VBIAS = 3.6V VOUT = 1.5V COUT = 1µF 16 1.55 1.6 1.4 1.40 10 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 0.07 0.06 1.60 1.45 VIN = VOUT +1V VBIAS = 3.6V VOUT1 = 1.5V VOUT2 = 1.2V COUT = 1µF CBYP = 10nF 0.03 20 1.70 Ground Current (V BIAS) vs. Output Current 0.08 300mA 60 1M 15 25 50 100 150 200 250 300 OUTPUT CURRENT (mA) IOUT1 = IOUT2 = 300mA 100 1k 10k 100k FREQUENCY (Hz) 28 26 12.5 VOUT2 = 1.2V COUT = 1µF 11 C BYP = 10nF 29 13.0 12.0 0 VBIAS = 3.6V 12 VOUT1 = 1.5V 50 100 150 200 250 300 LOAD CURRENT (mA) Output Voltage vs. Input Voltage 1.8V 1.1V 1.40 1.35 VIN = VOUT +1V VBIAS = 3.6V EN = VIN VOUT = 1.5V COUT = 1µF 1.30 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 650 630 Current Limit vs. Input Voltage 610 590 570 550 530 VBIAS = 5.5V IOUT = 10mA COUT1 = 1µF COUT2 = 1µF 0.6 0.4 0.2 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 INPUT VOLTAGE (V) 5 510 490 VBIAS = 5.5V VOUT = 1.5V COUT = 1µF 470 450 1.5 2 2.5 3 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) M9999-070208-A Micrel, Inc. MIC5315 Typical Characteristics (continued) 1 Output Noise Spectral Density 0.1 0.01 COUT = 1µF CBYP = 10nF 0.001 10 July 2008 100 1k 10k 100k FREQUENCY (Hz) 1M 6 M9999-070208-A Micrel, Inc. MIC5315 Functional Characteristics July 2008 7 M9999-070208-A Micrel, Inc. MIC5315 Functional Diagram THERMAL LIMIT REFERENCE QUICK START CBYP EN1 VIN1 VBIAS EN2 VIN2 LDO1 VOUT1 CURRENT LIMIT VOUT2 /VSC2 LDO2 GND MIC5315 Block Diagram July 2008 8 M9999-070208-A Micrel, Inc. MIC5315 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 capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. Application Information The MIC5315 is a high performance, dual low input voltage, ultra-low dropout regulator designed for low applications requiring very fast transient response. The MIC5315 utilizes two input supplies (VIN and VBIAS), significantly reducing the dropout voltage. The MIC5315 regulator is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. Bypass Capacitor A capacitor can be placed from the bypass pin-to-ground to reduce the output voltage noise. The capacitor bypasses the internal reference. A 0.01µF capacitor is recommended for applications that require low-noise outputs. The bypass capacitor can be increased, further reducing noise and improving PSRR. Turn-on time increases slightly with respect to the bypass capacitance. A unique, quick-start circuit allows the MIC5315 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Bias Supply Voltage VBIAS, requiring relatively light current, provides power to the control portion of the MIC5315. Bypassing on the bias pin is recommended to improve performance of the regulator during line and load transients. A 1µF ceramic capacitor from VBIAS-to-ground is recommended to help reduce the high frequency noise from being injected into the control circuitry. No-Load Stability Unlike many other voltage regulators, the MIC5315 will remain stable and in regulation with no load. This is especially important in CMOS RAM keep-alive applications. Input Supply Voltage VIN1 and VIN2, provide the supply to power the LDOs independently. The minimum input voltage is 1.7V allowing conversion from low voltage supplies. The low input voltage provides high efficiency by reducing the input to output voltage step which minimizes the regulator power loss. Enable/Shutdown The MIC5315 is provided with dual active-high enable pins that allow each regulator to be disabled independently. Forcing the enable pin low disables the regulator and sends it into a “zero” off-mode-current state. In this state, current consumed by the regulator goes nearly to zero. Forcing the enable pin high enables the output voltage. The active-high enable pin uses CMOS technology and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. Input Capacitor The MIC5315 is a high-performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 1µF capacitor is required from the input-to-ground to provide stability. Low-ESR ceramic capacitors provide optimal performance at a minimum of space. Additional highfrequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out high-frequency noise and are good practice in any RF-based circuit. X5R or X7R dielectrics are recommended for the input capacitor. Y5V dielectrics lose most of their capacitance over temperature and are therefore, not recommended. Voltage Select The MIC5315 incorporates voltage select technology to set LDO2’s voltage output to a preset lower level. The /VSC2 pin is an active low input. A logic high signal sets VOUT2 to the full output voltage; while a logic low signal sets VOUT2 to the lower output voltage. Output Capacitor The MIC5315 requires an output capacitor of 1µF or greater to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 1µF ceramic output capacitor and does not improve significantly with larger capacitance. X7R/X5R dielectric-type 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 capacitors change value by as much as July 2008 Thermal Considerations The MIC5315 is designed to provide 300mA of continuous current for both outputs in a very small package. Maximum ambient operating temperature can be calculated based upon the output current and the voltage drop across the part. Given that the input voltage is 1.8V, the output voltage is 1.5V for VOUT1, 1.0V for VOUT2 and the output current = 300mA for each output. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN – VOUT1) IOUT1 + (VIN – VOUT2) I OUT2 + VBIAS IGND Because this device is CMOS and the ground current is 9 M9999-070208-A Micrel, Inc. MIC5315 typically <100µA over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. PD = (1.8V – 1.5V) × 300mA + (1.8V – 1.0V) × 300mA PD = 0.33W To determine the maximum ambient operating temperature of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation: ⎛ TJ(MAX) − TA PD(MAX) = ⎜ ⎜ θ JA ⎝ The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5315-F5CYMT at an input voltage of 1.8V and 300mA, loads at each output with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.33W = (125°C – TA)/(80°C/W) TA = 98.6°C For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the “Regulator Thermals” section of Micrel’s Designing with Low-Dropout Voltage Regulators handbook. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf ⎞ ⎟ ⎟ ⎠ TJ(max) = 125°C, the maximum junction temperature of the die. The junction-to-ambient thermal resistance for the minimum footprint, is θJA = 80°C/W. Substituting PD for PD(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. July 2008 10 M9999-070208-A Micrel, Inc. MIC5315 MIC5315 Typical Application Circuit U1 MIC5315-xxyYMT VIN J1 VIN J3 VBIAS J4 EN1 J5 EN2 C1 1µF C2 1µF 1 VIN1 2 VIN2 3 VBIAS 4 EN1 5 EN2 7 CBYP C3 10nF GND 6 J2 GND VOUT1 10 J7 VO1 VOUT2 9 J8 VO2 /VSC2 8 J10 VSC C5 1µF C4 1µF J9 GND Bill of Materials Item Part Number Manufacturer Description (1) TDK Qty C1, C2, C4, C5 C1608X5R1A105K Capacitor, 1µF Ceramic, 10V, X5R, Size 0603 4 C3 VJ0603Y103KXACW1BC Vishay(2) Capacitor, 0.01µF, 50V, X7R, Size 0603 1 U1 MIC5315-xxyYMT Micrel(3) Low Voltage Dual 300mA LDO with VSCALE 1 Notes: 1. TDK: www.tdk.com 2. Vishay: www.vishay.com 3. Micrel, Inc.: www.micrel.com July 2008 11 M9999-070208-A Micrel, Inc. MIC5315 PCB Layout Recommendations Top Layer Bottom Layer July 2008 12 M9999-070208-A Micrel, Inc. MIC5315 Package Information ® 10-Pin 2mm × 2mm Thin MLF (MT) 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. © 2008 Micrel, Incorporated. July 2008 13 M9999-070208-A