MIC5320 Dual, High Performance 150mA µCap ULDO™ General Description Features The MIC5320 is a tiny Dual Ultra Low-Dropout (ULDO™) linear regulator ideally suited for portable electronics. It is ideal for general purpose/ digital applications which require high power supply ripple rejection (PSRR) >65dB, eliminating the need for a bypass capacitor and providing two enable pins for maximum flexibility. The MIC5320 integrates two highperformance; 150mA ULDOs into a tiny 6-pin 1.6mm x 1.6mm leadless MLF® package, which provides exceptional thermal package characteristics. The MIC5320 is a µCap design which enables operation with very small ceramic output capacitors for stability, thereby reducing required board space and component cost. The combination of extremely low-drop-out voltage, high power supply rejection and exceptional thermal package characteristics makes it ideal for powering cellular phone camera modules, imaging sensors for digital still cameras, PDAs, MP3 players and WebCam applications. The MIC5320 ULDO™ is available in fixed-output voltages in the tiny 6-pin 1.6mm x 1.6mm leadless MLF® package which is only 2.56mm2 in area, less than 30% the area of the SOT-23, TSOP and MLF® 3x3 packages. It’s also available in the thin SOT-23-6 lead package. Additional voltage options are available. For more information, contact Micrel marketing department. • • 2.3V to 5.5V input voltage range Ultra-low dropout voltage ULDO™ 35mV @ 150mA Tiny 6-pin 1.6mm x 1.6mm MLF® leadless package Low cost TSOT-23-6 package Independent enable pins PSRR – >65dB on each LDO 150mA output current per LDO µCap stable with 1µF ceramic capacitor Low quiescent current – 85µA per output Fast turn-on time – 30µs Thermal shutdown protection Current limit protection • • • • • • • • • • Applications • • • • • • Mobile phones PDAs GPS receivers Portable electronics Portable media players Digital still and video cameras Data sheets and supporting documentation can be found on Micrel’s web site at www.micrel.com. Typical Application MIC5320-x.xYML 1µF VIN VOUT 1 Rx/Synth EN 1 VOUT 2 Tx EN 2 GND 1µF 1µF RF Transceiver RF Power Supply Circuit ULDO is a trademark of Micrel, Inc. MLF and MicroLeadFrame are registered trademarks of Amkor Technologies, 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 2006 M9999-073106 Micrel, Inc. MIC5320 Ordering Information Part number MIC5320-1.8/1.5YML MIC5320-1.8/1.6YML MIC5320-2.5/1.8YML MIC5320-2.5/2.5YML MIC5320-2.6/1.85YML MIC5320-2.6/1.8YML MIC5320-2.7/2.7YML MIC5320-2.8/1.5YML MIC5320-2.8/1.8YML MIC5320-2.8/2.6YML MIC5320-2.8/2.8YML MIC5320-2.8/2.85YML MIC5320-2.85/1.85YML MIC5320-2.85/2.6YML MIC5320-2.85/2.85YML MIC5320-2.9/1.5YML MIC5320-2.9/1.8YML MIC5320-2.9/2.9YML MIC5320-3.0/1.8YML MIC5320-3.0/2.5YML MIC5320-3.0/2.6YML MIC5320-3.0/2.8YML MIC5320-3.0/2.85YML MIC5320-3.0/3.0YML MIC5320-3.3/1.5YML MIC5320-3.3/1.8YML MIC5320-3.3/2.5YML MIC5320-3.3/2.6YML MIC5320-3.3/2.7YML MIC5320-3.3/2.8YML MIC5320-3.3/2.85YML MIC5320-3.3/2.9YML MIC5320-3.3/3.0YML MIC5320-3.3/3.2YML MIC5320-3.3/3.3YML MIC5320-1.8/1.5YD6 MIC5320-1.8/1.6YD6 MIC5320-2.5/1.8YD6 MIC5320-2.5/2.5YD6 MIC5320-2.6/1.85YD6 MIC5320-2.6/1.8YD6 MIC5320-2.7/2.7YD6 MIC5320-2.8/1.5YD6 MIC5320-2.8/1.8YD6 MIC5320-2.8/2.6YD6 MIC5320-2.8/2.8YD6 July 2006 Manufacturing Part Number MIC5320-GFYML MIC5320-GWYML MIC5320-JGYML MIC5320-JJYML MIC5320-KDYML MIC5320-KGYML MIC5320-LLYML MIC5320-MFYML MIC5320-MGYML MIC5320-MKYML MIC5320-MMYML MIC5320-MNYML MIC5320-NDYML MIC5320-NKYML MIC5320-NNYML MIC5320-OFYML MIC5320-OGYML MIC5320-OOYML MIC5320-PGYML MIC5320-PJYML MIC5320-PKYML MIC5320-PMYML MIC5320-PNYML MIC5320-PPYML MIC5320-SFYML MIC5320-SGYML MIC5320-SJYML MIC5320-SKYML MIC5320-SLYML MIC5320-SMYML MIC5320-SNYML MIC5320-SOYML MIC5320-SPYML MIC5320-SRYML MIC5320-SSYML MIC5320-GFYD6 MIC5320-GWYD6 MIC5320-JGYD6 MIC5320-JJYD6 MIC5320-KDYD6 MIC5320-KGYD6 MIC5320-LLYD6 MIC5320-MFYD6 MIC5320-MGYD6 MIC5320-MKYD6 MIC5320-MMYD6 Voltage 1.8V/1.5V 1.8V/1.6V 2.5V/1.8V 2.5V/2.5V 2.6V/1.85 2.6V/1.8V 2.7V/2.7V 2.8V/1.5V 2.8V/1.8V 2.8V/2.6V 2.8V/2.8V 2.8V/2.85V 2.85V/1.85V 2.85V/2.6V 2.85V/2.85V 2.9V/1.5V 2.9V/1.8V 2.9V/2.9V 3.0V/1.8V 3.0V/2.5V 3.0V/2.6V 3.0V/2.8V 3.0V/2.85V 3.0V/3.0V 3.3V/1.5V 3.3V/1.8V 3.3V/2.5V 3.3V/2.6V 3.3V/2.7V 3.3V/2.8V 3.3V/2.85V 3.3V/2.9V 3.3V/3.0V 3.3V/3.2V 3.3V/3.3V 1.8V/1.5V 1.8V/1.6V 2.5V/1.8V 2.5V/2.5V 2.6V/1.85 2.6V/1.8V 2.7V/2.7V 2.8V/1.5V 2.8V/1.8V 2.8V/2.6V 2.8V/2.8V 2 Junction Temperature Range –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C Package 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin 1.6x1.6 MLF® 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 M9999-073106 Micrel, Inc. MIC5320-2.8/2.85YD6 MIC5320-2.85/1.85YD6 MIC5320-2.85/2.6YD6 MIC5320-2.85/2.85YD6 MIC5320-2.9/1.5YD6 MIC5320-2.9/1.8YD6 MIC5320-2.9/2.9YD6 MIC5320-3.0/1.8YD6 MIC5320-3.0/2.5YD6 MIC5320-3.0/2.6YD6 MIC5320-3.0/2.8YD6 MIC5320-3.0/2.85YD6 MIC5320-3.0/3.0YD6 MIC5320-3.3/1.5YD6 MIC5320-3.3/1.8YD6 MIC5320-3.3/2.5YD6 MIC5320-3.3/2.6YD6 MIC5320-3.3/2.7YD6 MIC5320-3.3/2.8YD6 MIC5320-3.3/2.85YD6 MIC5320-3.3/2.9YD6 MIC5320-3.3/3.0YD6 MIC5320-3.3/3.2YD6 MIC5320-3.3/3.3YD6 MIC5320 MIC5320-MNYD6 MIC5320-NDYD6 MIC5320-NKYD6 MIC5320-NNYD6 MIC5320-OFYD6 MIC5320-OGYD6 MIC5320-OOYD6 MIC5320-PGYD6 MIC5320-PJYD6 MIC5320-PKYD6 MIC5320-PMYD6 MIC5320-PNYD6 MIC5320-PPYD6 MIC5320-SFYD6 MIC5320-SGYD6 MIC5320-SJYD6 MIC5320-SKYD6 MIC5320-SLYD6 MIC5320-SMYD6 MIC5320-SNYD6 MIC5320-SOYD6 MIC5320-SPYD6 MIC5320-SRYD6 MIC5320-SSYD6 2.8V/2.85V 2.85V/1.85V 2.85V/2.6V 2.85V/2.85V 2.9V/1.5V 2.9V/1.8V 2.9V/2.9V 3.0V/1.8V 3.0V/2.5V 3.0V/2.6V 3.0V/2.8V 3.0V/2.85V 3.0V/3.0V 3.3V/1.5V 3.3V/1.8V 3.3V/2.5V 3.3V/2.6V 3.3V/2.7V 3.3V/2.8V 3.3V/2.85V 3.3V/2.9V 3.3V/3.0V 3.3V/3.2V 3.3V/3.3V –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 Note: 1. Other Voltages available. Contact Micrel for detail. July 2006 3 M9999-073106 Micrel, Inc. MIC5320 Pin Configuration VIN 1 6 VOUT1 GND 2 5 VOUT2 EN2 3 4 EN1 VIN GND EN2 3 2 1 4 5 6 VOUT1 VOUT2 EN1 6-Pin 1.6mm x 1.6mm MLF (ML) Top View TSOT-23-6 (D6) Top View Pin Description Pin Number MLF-6 Pin Number TSOT-23-6 Pin Name Pin Function 1 3 VIN Supply Input. 2 2 GND Ground 3 1 EN2 Enable Input (regulator 2). Active High Input. Logic High = On; Logic Low = Off; Do not leave floating. 4 6 EN1 Enable Input (regulator 1). Active High Input. Logic High = On; Logic Low = Off; Do not leave floating. 5 5 VOUT2 Regulator Output – LDO2 6 4 VOUT1 Regulator Output – LDO1 July 2006 4 M9999-073106 Micrel, Inc. MIC5320 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) .....................................0V to +6V Enable Input Voltage (VEN)...........................0V to +6V 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).............................. +2.3V to +5.5V Enable Input Voltage (VEN).............................. 0V to VIN Junction Temperature (TJ) ................. –40°C to +125°C Junction Thermal Resistance MLF-6 (θJA).............................................. 100°C/W TSOT-6 (θJA) ........................................... 235°C/W Electrical Characteristics(5) VIN = EN1 = EN2 = VOUT + 1.0V; higher of the two regulator outputs, IOUTLDO1 = IOUTLDO2 = 100µA; COUT1 = COUT2 = 1µF; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted. Parameter Conditions Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage (6) Ground Current Ground Current in Shutdown Ripple Rejection Min Typ Max Units Variation from nominal VOUT -2.0 +2.0 % Variation from nominal VOUT; –40°C to +125°C -3.0 +3.0 % %/V %/V VIN = VOUT + 1V to 5.5V; IOUT = 100µA 0.02 0.3 0.6 IOUT = 100µA to 150mA 0.5 2 IOUT = 100µA 0.1 IOUT = 50mA 12 IOUT = 100mA IOUT = 150mA EN1 = High; EN2 = Low; IOUT = 100µA to 150mA % mV 50 mV 25 75 mV 35 100 mV 85 120 µA EN1 = Low; EN2 = High; IOUT = 100µA to 150mA 85 120 µA EN1 = EN2 = High; IOUT1 = 150mA, IOUT2 = 150mA 150 190 µA EN1 = EN2 = 0V 0.01 2 µA f = 1kHz; COUT = 1.0µF 65 dB f=20kHz; COUT = 1.0µF 45 dB Current Limit VOUT = 0V Output Voltage Noise COUT = 1.0µF; 10Hz to 100KHz 300 550 950 90 mA µVRMS Enable Inputs (EN1 / EN2) Enable Input Voltage 0.2 Logic Low 1.1 Logic High Enable Input Current V V VIL ≤ 0.2V 0.01 1 µA VIH ≥ 1.0V 0.01 1 µA 30 100 µs Turn-on Time (See Timing Diagram) Turn-on Time (LDO1 and 2) Notes: COUT = 1.0µF 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, 1.5k 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 2.3V, the dropout voltage is the input-to-output differential with the minimum input voltage 2.3V. July 2006 5 M9999-073106 Micrel, Inc. MIC5320 Functional Diagram VIN VOUT 1 LDO1 LDO2 VOUT 2 EN 1 EN 2 Enable Reference GND MIC5320 Block Diagram July 2006 6 M9999-073106 Micrel, Inc. MIC5320 Typical Characteristics -80 Power Supply Rejection Ratio 40 -70 35 -60 30 -50 150mA -40 -30 50mA VIN = VOUT +1V -10 VOUT = 2.8V COUT = 1µF 0 0.1 1 10 100 1,000 FREQUENCY (kHz) Ground Current vs. Temperature 95 80 75 70 90 0 0 100 85 VIN = VOUT + 1V VOUT = 2.8V COUT = 1µF EN1 = VIN EN2 = GND 20 40 60 80 TEMPERATURE (°C) 50 VIN = VOUT + 1V 45 VOUT = 2.8V C 40 OUT = 1µF 35 5 0 5 VIN = VOUT + 1V VOUT = 2.8V COUT = 1µF EN1 = VIN 25 50 75 100 125 150 OUTPUT CURRENT (mA) Ground Current vs. Temperature 75 70 2.90 1.5 VIN = VOUT + 1V VOUT = 2.8V COUT = 1µF EN1 = VIN EN2 = GND 20 40 60 80 TEMPERATURE (°C) Output Voltage vs. Output Current Output Voltage vs. Input Voltage 2.8V 1.5V 1.0 0.5 0.0 0 1.60 IOUT = 100µA COUT = 1µF 1 2 3 4 5 6 INPUT VOLTAGE (V) Output Voltage vs. Output Current 2.85 1.55 2.80 1.50 VIN = VOUT + 1V 2.75 VOUT = 2.8V COUT1 = COUT2 = 1µF EN1 = VIN EN2 = GND 2.70 0 25 50 75 100 125 150 OUTPUT CURRENT (mA) VIN = VOUT + 1V 1.45 VOUT = 1.5V COUT1 = COUT2 = 1µF EN1 = GND EN2 = VIN 1.40 0 25 50 75 100 125 150 OUTPUT CURRENT (mA) 100µA 20 40 60 80 TEMPERATURE (°C) Ground Current vs. Output Current 162 Ground Current vs. Output Current 158 150 VIN = VOUT + 1V VOUT = 2.85V EN1 = VIN COUT1 = 1µF 25 50 75 100 125 150 OUTPUT CURRENT (mA) 146 142 0 610 600 Current Limit vs. Input Voltage 590 580 570 560 154 July 2006 3.0 20 40 60 80 TEMPERATURE (°C) 2.0 150mA 80 70 0 2.55 2.50 VIN = VOUT + 1V VOUT = 2.8V COUT = 1µF EN1 = VIN 100mA 85 75 Output Voltage vs. Temperature 150mA 50mA 10mA 80 2.70 2.65 2.60 2.5 90 100µA Dropout Voltage vs. Temperature 30 25 20 15 10 20 95 90 85 25 10 3.00 2.95 2.90 2.85 2.80 2.75 15 -20 100 Dropout Voltage vs. Output Current VIN = VOUT + 1V VOUT = 2.85V EN1 = EN2 = VIN COUT1 = COUT2 = 1µF 25 50 75 100 125 150 OUTPUT CURRENT (mA) 7 550 540 530 520 510 3 EN1 = VIN COUT = 1µF 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5 M9999-073106 Micrel, Inc. MIC5320 Typical Characteristics (continued) Output Noise Spectral Density 10 0.1 0.01 VIN = 4V VOUT = 2.8V COUT = 1µF ILOAD = 50mA 0.001 0.01 July 2006 0.1 1 10 100 1,000 FREQUENCY (kHz) 8 M9999-073106 Micrel, Inc. MIC5320 Functional Characteristics Enable Turn-On EN1 (1V/div) Output Voltage (20mV/div) Load Transient 150mA VIN = VOUT + 1V VOUT = 2.8V Output Current (50mA/div) COUT = 1µF VOUT1 (1V/div) VIN = VOUT + 1V VOUT = 2.8V COUT = 1µF 10mA Time (10µs/div) Time (40µs/div) Line Transient 5.5V Input Voltage (2V/div) 4V VIN = VOUT + 1V VOUT = 2.8V COUT = 1µF Output Voltage (50mV/div) IOUT = 10mA Time (40µs/div) July 2006 9 M9999-073106 Micrel, Inc. MIC5320 Applications Information Enable/Shutdown The MIC5320 comes 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 MIC5320 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 highfrequency noise and are good practice in any RFbased circuit. Output Capacitor The MIC5320 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 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. No-Load Stability Unlike many other voltage regulators, the MIC5320 will remain stable and in regulation with no load. This is especially important in CMOS RAM keep-alive applications. July 2006 Thermal Considerations The MIC5320 is designed to provide 150mA of continuous current for both outputs 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, 1.5V for VOUT2 and the output current = 150mA. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN – VOUT1) IOUT1 + (VIN – VOUT2) IOUT2+ VIN IGND Because this device is CMOS and the ground current is typically <150µA over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. PD = (3.3V – 2.8V) × 150mA + (3.3V -1.5) × 150mA PD = 0.345W To determine the maximum ambient operating temperature of the package, use the junction-toambient 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 = 100°C/W. The table below shows junction-to-ambient thermal resistance for the MIC5320 in different packages. Package 6-Pin 1.6x1.6 MLF ® θJA Recommended Minimum Footprint θJC 100°C/W 2°C/W Thermal Resistance Substituting PD for PD(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The junction-to-ambient thermal resistance for the minimum footprint is 100°C/W. The maximum power dissipation must not be exceeded for proper operation. 10 M9999-073106 Micrel, Inc. MIC5320 For example, when operating the MIC5320-MFYML at an input voltage of 3.3V and 150mA loads at each output with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.345W = (125°C – TA)/(100°C/W) TA=90.5°C Therefore, a 2.8V/1.5V application with 150mA at each output current can accept an ambient operating temperature of 90.5°C in a 1.6mm x 1.6mm 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 July 2006 11 M9999-073106 Micrel, Inc. MIC5320 Package Information 6-Pin 1.6mm x 1.6mm MLF (ML) 6-Pin TSOT-23 (D6) July 2006 12 M9999-073106 Micrel, Inc. MIC5320 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. © 2005 Micrel, Inc. July 2006 13 M9999-073106