MIC5350 Dual 300mA/500mA LDO in 2mm x 2mm Thin MLF® General Description Features The MIC5350 is a tiny Dual Ultra Low-Dropout (ULDO™) linear regulator ideally suited for portable electronics due to its low output noise. The MIC5350 integrates two highperformance; 300mA (VOUT1) and 500mA (VOUT2) ULDOs™ into a tiny 2mm x 2mm leadless Thin MLF® package, which provides exceptional thermal characteristics. The MIC5350 is designed to be stable with small ceramic output capacitors thereby reducing required board space and component cost. The combination of extremely lowdrop-out voltage, low output noise and exceptional thermal package characteristics makes it ideal for powering RF and noise-sensitive circuitry, cellular phone camera modules, imaging sensors for digital still cameras, PDAs, MP3 players and WebCam applications. The MIC5350 ULDO™ is available in fixed-output voltages in the tiny 8-pin 2mm x 2mm leadless Thin MLF® package which occupies less than half the board area of a single SOT23-6 package. Additional voltage options are available. For more information, contact Micrel marketing. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. • 2.6V to 5.5V input voltage range • Ultra-low dropout voltage: 75mV @ 300mA and 125mV @ 500mA • Ultra-low output noise: 30µVRMS • ±2% initial output accuracy • Tiny 8-pin 2mm x 2mm Thin MLF® leadless package • Excellent Load/Line transient response • Fast start-up time: 30µs • µCap stable with 2.2µF ceramic capacitors • Thermal shutdown protection • Low quiescent current: 130µA with both outputs at maximum load • Current-limit protection Applications • • • • • • Mobile phones PDAs GPS receivers Portable electronics Portable media players Digital still and video cameras _________________________________________________________________________________________________________________________ Typical Application RF Power Supply Circuit ULDO is a trademark of Micrel, Inc 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 June 2010 M9999-060410 Micrel, Inc. MIC5350 Block Diagram June 2010 2 M9999-060410 Micrel, Inc. MIC5350 Ordering Information Manufacturing Part Number Part Number Marking Voltage(V) VOUT1 VOUT2 Junction Temperature Range Package MIC5350-2.8/1.8YMT MIC5350-MGYMT FMG 2.8V 1.8V –40°C to +125°C 8-Pin 2x2 TMLF® MIC5350-2.8/2.8YMT MIC5350-MMYMT FMM 2.8V 2.8V –40°C to +125°C 8-Pin 2x2 TMLF® MIC5350-3.0/1.8YMT MIC5350-PGYMT FPG 3.0V 1.8V –40°C to +125°C 8-Pin 2x2 TMLF® MIC5350-3.3/1.8YMT MIC5350-SGYMT FSG 3.3V 1.8V –40°C to +125°C 8-Pin 2x2 TMLF® MIC5350-3.3/2.8YMT MIC5350-SMYMT FSM 3.3V 2.8V –40°C to +125°C 8-Pin 2x2 TMLF® Notes 1. Pin 1 identifier= “▲”. 2. For other voltage options contact Micrel Marketing. 3. Thin MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu, Mold compound is Halogen Free. ® Pin Configuration 8-Pin 2mm x 2mm TMLF (MT) TOP VIEW Pin Description Pin Number Pin Name Pin Function 1 VIN Supply Input. 2 GND Ground. 3 BYP Reference Bypass: Connect external 0.1µF to GND to reduce output noise. May be left open when bypass capacitor is not required. 4 EN2 Enable Input (regulator 2). Active High Input. Logic High = On; Logic Low = Off; Do not leave floating. 5 EN1 Enable Input (regulator 1). Active High Input. Logic High = On; Logic Low = Off; Do not leave floating. 6 NC Not internally connected. 7 VOUT2 Regulator Output – LDO2 (500mA output). 8 VOUT1 Regulator Output – LDO1 (300mA output). EPAD HS Pad Heatsink Pad internally connected to ground. June 2010 3 M9999-060410 Micrel, Inc. MIC5350 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) ........................................ −0.3V to +6V Enable Input Voltage (VEN1 , VEN2).....................−0.3V to VIN 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 (VIN)..................................... +2.6V to +5.5V Enable Input Voltage (VEN1, VEN2) .......................... 0V to VIN Junction Temperature ............................... –40°C to +125°C Junction Thermal Resistance 8-Pin 2mm x 2mm Thin MLF® (θJA) ...................90°C/W Electrical Characteristics(5) VIN = VEN1 = VEN2 = VOUT + 1.0V; higher of the two regulator outputs, IOUTLDO1 = IOUTLDO2 = 100µA; COUT1 = COUT2 = 2.2µF; CBYP = 0.1µF; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted. Parameter Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage(6) Ground Current Ground Current in Shutdown Ripple Rejection Current Limit Output Voltage Noise Conditions Min. Typ. Max. Variation from nominal VOUT -2.0 +2.0 Variation from nominal VOUT; –40°C to +125°C -3.0 +3.0 VIN = VOUT + 1V to 5.5V; IOUT = 100µA 0.05 0.3 0.6 IOUT1, 2 = 100µA to 300mA 0.5 2.0 IOUT2 =100µA to 500mA 0.7 2.5 IOUT1, 2 = 100µA 0.1 IOUT1, 2 = 50mA 12 50 IOUT1, 2 = 300mA 75 200 IOUT2 = 500mA 125 300 VEN1 ≥ 1.2V; VEN2 ≤ 0.2V; IOUT = 0mA to 300mA 95 175 VEN1 ≤ 0.2V; VEN2 ≥ 1.2V; IOUT2 = 0mA to 500mA 95 175 VEN1 = VEN2 = 1.2V; IOUT1 = 300mA, IOUT2 = 500mA 130 240 VEN1 = VEN2 = 0V 0.01 2 f = 1kHz; COUT = 2.2µF; CBYP = 0.1µF 50 f = 20kHz; COUT = 2.2µF; CBYP = 0.1µF 35 % %/V % mV µA µA dB VOUT1 = 0V 350 560 850 VOUT2 = 0V 550 950 1500 COUT = 2.2µF; CBYP = 0.1µF; 10Hz to 100kHz Units 30 mA µVRMS Enable Inputs (EN1 / EN2) Enable Input Voltage Enable Input Current 0.2 Logic Low 1.2 Logic High VIL ≤ 0.2V 0.01 VIH ≥ 1.2V 0.01 V µA Turn-on Time (See Timing Diagram) Turn-on Time (LDO1 and 2) COUT = 2.2µF; CBYP = 0.01µF 30 100 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. 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. 6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal VOUT. For outputs below 2.6V, the dropout voltage is the input-to-output differential with the minimum input voltage 2.6V. June 2010 4 M9999-060410 Micrel, Inc. MIC5350 Typical Characteristics Ground Current vs. Output Current 100 Output Voltage vs. Input Voltage Ground Current vs. Temperature 3.6 140 95 90 85 VOUT2 = 2.8V VIN = 4.3V 80 0 100 200 300 400 130 125 120 115 110 IOUT1 = 300mA 105 100 IOUT2 = 500mA -40 -20 0 OUTPUT CURRENT (mA) 20 40 60 80 2.2 2 1.8 VOUT2 = 2.8V CIN = COUT = 2.2µF 4.5 5 3 800 700 600 VOUT1 500 5.5 400 2.5 3 3.5 4 4.5 5 140 VOUT2 = 500mA 100 VOUT1, 2 = 300mA 80 60 40 VOUT1, 2 = 150mA 20 -20 40 20 VOUT2 = 2.8V VEN1 = 0.0V 0 0 50 100 150 200 250 300 350 400 450 500 OUTPUT CURRENT (mA) June 2010 0 20 40 60 80 100 120 TEMPERATURE (°C) Output Noise Spectral Density 10 3.4 VOUT1 3.2 3 2.8 VOUT2 2.6 1 NOISE μV/√Hz 60 OUTPUT VOLTAGE (V) DROPOUT VOLTAGE (mV) 80 5.5 120 -40 3.6 100 5 0 5.5 Output Voltage vs. Output Current Dropout Voltage vs. Output Current 120 4.5 160 Input Voltage(V) 140 4 180 VOUT2 INPUT VOLTAGE (V) 3.5 Dropout Voltage vs. Temperature 1.4 4 VOUT1 = 3.3V CIN = COUT = 2.2µF INPUT VOLTAGE (V) DROPOUT VOLTAGE (mV) Current Limit (mA) OUTPUT VOLTAGE (V) 500mA 2.4 3.5 2 1.8 2.5 1000 3 2.2 1.4 900 2.5 2.4 Current Limit vs. Input Voltage 100μA 1.6 300mA 2.6 100 120 140 2.8 2.6 3 2.8 TEMPERATURE (°C) Output Voltage vs. Input Voltage 3 100μA 3.2 1.6 95 90 500 3.4 IOUT1 = 300mA and IOUT2 = 500mA OUTPUT VOLTAGE (V) GROUND CURRENT (μA) GROUND CURRENT (μA) 135 VIN = 4.3V CIN = COUT = 2.2μF 0.1 VIN = 4.5V COUT = 2.2μF VOUT1 = 2.8V ILOAD = 75mA 0.01 2.4 0 50 100 150 200 250 300 350 400 450 500 OUTPUT CURRENT (mA) 5 0.001 10 100 1,000 10,000 100,000 1,000,000 10,000,000 FREQUENCY (Hz) M9999-060410 Micrel, Inc. MIC5350 Typical Characteristics (Continued) Power Supply Rejection Ratio -100 -90 -80 PSRR (dB) -70 100uA 500mA 300mA -60 -50 -40 -30 VIN = 3.8V VOUT2 = 3.3V COUT = 2.2μF CBYP = 0.1μF -20 -10 0 10 100 1,000 10,000 100,000 1,000,000 10,000,000 FREQUENCY (Hz) June 2010 6 M9999-060410 Micrel, Inc. MIC5350 Functional Characteristics June 2010 7 M9999-060410 Micrel, Inc. MIC5350 A unique, quick-start circuit allows the MIC5350 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Applications Information Enable/Shutdown The MIC5350 comes with dual active-high enable pins that allow each regulator to be enabled independently. Forcing both enable pins low disables the regulators 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. No-Load Stability Unlike many other voltage regulators, the MIC5350 will remain stable with no load. This is especially important in CMOS RAM keep-alive applications. Thermal Considerations The MIC5350 is designed to provide 300mA of continuous current for VOUT1 and 500mA for VOUT2 in a very small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. Given that the input voltage is 3.3V, the output voltage is 2.8V for VOUT1, 2.8V for VOUT2 and the output current 300mA and 500mA respectively. The actual power dissipation of the regulator circuit can be determined using the equation: Input Capacitor The MIC5350 is a high-performance, high-bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 2.2µF 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. PD = (VIN – VOUT1) IOUT1 + (VIN – VOUT2) IOUT2+ VIN IGND Because this device is CMOS and the ground current is typically <100µA over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. Output Capacitor The MIC5350 requires an output capacitor of 2.2µF 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 2.2µF ceramic output capacitor and does not improve significantly with larger capacitance. X7R/X5R dielectric-type ceramic capacitors are recommended because of their superior 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 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. PD = (3.3V – 2.8V) × 300mA + (3.3V -2.8) × 500mA PD = 0.4W 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: PD(MAX) = TJ(MAX) - TA JA TJ(max) = 125°C, the maximum junction temperature of the die θJA thermal resistance = 90°C/W. Bypass Capacitor A capacitor can be placed from the noise bypass pin-toground to reduce output voltage noise. The capacitor bypasses the internal reference. A 0.1µF 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 bypass capacitance. June 2010 ⎛ ⎝ 8 M9999-060410 Micrel, Inc. MIC5350 Thermal Resistance Therefore, a 2.8V/2.8V application with 300mA and 500mA output currents can accept an ambient operating temperature of 89°C in a 2mm x 2mm Thin MLF® package. 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 Substituting PD for PD(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The junction-toambient thermal resistance for the minimum footprint is 90°C/W. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5350-MMYMT at an input voltage of 3.3V with 300mA on VOUT1 and 500mA on VOUT2 and a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.4W = (125°C – TA)/(90°C/W) TA = 89°C June 2010 9 M9999-060410 Micrel, Inc. MIC5350 Typical Application Schematic Bill of Materials Item Part Number C1 C1608X5R0J106M C2 VJ0603Y104KXQ C3, C4 C1608X5R0J225M R1, R2 CRCW06031002FKEYE3 U1 MIC5350-XXYML Manufacturer TDK (1) (2) Vishay (1) TDK Vishay(2) Description Qty. Capacitor, 10µF Ceramic, 6.3V, X5R, Size 0603 1 Capacitor, 0.1µF Ceramic, 10V, X7R, Size 0603 1 Capacitor, 2.2µF Ceramic, 6.3V, X5R, Size 0603 2 Resistor, 10kΩ, 1%, 1/16W, Size 0603 (3) Micrel, Inc. Dual 300mA/500mA LDO, 2mm x 2mm Thin MLF 2 ® 1 Notes: 1. TDK: www.tdk.com. 2. Vishay Tel: www.vishay.com. 3. Micrel, Inc.: www.micrel.com. June 2010 10 M9999-060410 Micrel, Inc. MIC5350 PCB Layout Recommendations TOP LAYER BOTTOM LAYER June 2010 11 M9999-060410 Micrel, Inc. MIC5350 Package Information 8-Pin 2mm x 2mm TMLF (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. © 2010 Micrel, Incorporated. June 2010 12 M9999-060410