MIC5318 High Performance 300mA µCap ULDO™ General Description Features The MIC5318 is a high performance, single output ultra low drop-out (ULDO™) regulator, offering low total output noise in an ultra-small Thin MLF® package. The MIC5318 is capable of sourcing 300mA output current and offers high PSRR and low output noise, making it an ideal solution for RF applications. Ideal for battery operated applications, the MIC5318 offers 2% initial accuracy, extremely low dropout voltage (110mV @ 300mA), and low ground current (typically 85µA total). The MIC5318 can also be put into a zero-off-mode current state, drawing no current when disabled. The MIC5318 is available in the 1.6mm x 1.6mm Thin MLF® package, occupying only 2.56mm2 of PCB area, fully a 36% reduction in board area when compared to SC-70 and 2mm x 2mm MLF® packages. The MIC5318 has an operating junction temperature range of –40°C to +125°C and is available in fixed and adjustable output voltages in lead-free (RoHS compliant) Thin MLF® and Thin SOT23-5 packages. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • • • • • • • • • • • • Ultra low dropout voltage 110mV @ 300mA Input voltage range: 2.3V to 6.0V 300mA guaranteed output current Stable with ceramic output capacitors Ultra low output noise – 30µVrms Low quiescent current – 85µA total High PSRR > 70dB@1kHz Less than 35µs turn-on time High output accuracy – ± 2% initial accuracy – ± 3% over temperature Thermal shutdown and current limit protection Tiny 6-pin 1.6mm x 1.6mm Thin MLF® package Thin SOT23-5 package Applications • • • • • Mobile phones PDAs GPS receivers Portable electronics Digital still and video cameras Typical Application MIC5318-x.xYMT VIN VIN VOUT EN 1µF BYP GND 1µF 0.01µF Portable Application 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 January 2007 M9999-011207 Micrel, Inc. MIC5318 Functional Diagram VIN VOUT EN VREF QuickStart Error LDO Amp BYP Thermal Shutdown Current Limit GND MIC5318 Block Diagram – Fixed VIN VOUT EN QuickStart VREF Error LDO Amp BYP ADJ Thermal Shutdown Current Limit GND MIC5318 Block Diagram – Adjustable January 2007 2 M9999-011207 Micrel, Inc. MIC5318 Ordering Information Part number Marking Code Output Voltage Temperature Range Package MIC5318-1.5YMT 15D 1.5V –40°C to +125°C 6-Pin 1.6 x 1.6 Thin MLF® MIC5318-1.8YMT 18D 1.8V –40°C to +125°C 6-Pin 1.6 x 1.6 Thin MLF® MIC5318-2.8YMT 28D 2.8V –40°C to +125°C 6-Pin 1.6 x 1.6 Thin MLF® MIC5318-3.3YMT 33D 3.3V –40°C to +125°C 6-Pin 1.6 x 1.6 Thin MLF® MIC5318YMT DAA ADJ –40°C to +125°C 6-Pin 1.6 x 1.6 Thin MLF® MIC5318-1.5YD5 QD15 1.5V –40°C to +125°C 5-Pin Thin SOT23 MIC5318-1.8YD5 QD18 1.8V –40°C to +125°C 5-Pin Thin SOT23 MIC5318-2.8YD5 QD28 2.8V –40°C to +125°C 5-Pin Thin SOT23 MIC5318-3.3YD5 QD33 3.3V –40°C to +125°C 5-Pin Thin SOT23 MIC5318YD5 QDAA ADJ –40°C to +125°C 5-Pin Thin SOT23 Note: For availability on other voltages, please contact Micrel for details. January 2007 3 M9999-011207 Micrel, Inc. MIC5318 Pin Configuration EN 1 6 BYP GND 2 5 NC IN 3 4 OUT ® EN 1 6 BYP GND 2 5 ADJ IN 3 4 OUT ® 6-Pin 1.6mm x 1.6mm Thin MLF (MT) Fixed (Top View) 6-Pin 1.6mm x 1.6mm Thin MLF (MT) Adjustable (Top View) EN GND IN 1 3 2 EN GND IN 1 3 2 4 BYP 4 ADJ 5 OUT 5-Pin Thin SOT23 (D5) Fixed (Top View) 5 OUT 5-Pin Thin SOT23 (D5) Adjustable (Top View) Pin Description Pin No. Thin MLF-6 Fixed Pin No. Thin MLF-6 Adj. Pin No. Thin SOT23-5 Fixed Pin No. Thin SOT23-5 Adj. Pin Name 1 1 3 3 EN 2 2 2 2 GND 3 3 1 1 IN 4 4 5 5 OUT Output Voltage. 5 – – – NC No connection. – 5 – 4 ADJ Adjust Input. Connect to external resistor voltage divider network. 6 6 4 – BYP Reference Bypass: Connect external 0.01µF to GND for reduced Output Noise. May be left open. HS Pad HS Pad – – E PAD January 2007 4 Pin Function Enable Input. Active High. High = on, low = off. Do not leave floating. Ground Supply Input. Exposed Heatsink Pad connected to ground internally. M9999-011207 Micrel, Inc. MIC5318 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) ..................................0V to +6.5V Enable Input Voltage (VEN)........................0V to +6.5V Power Dissipation, Internally Limited(3) Lead Temperature (soldering, 3sec) ..................260°C Junction Temperature (TJ)................ –40°C to +125°C Storage Temperature (TS) ................ –65°C to +150°C ESD Rating(4) Supply Voltage (VIN).............................. +2.3V to +6.0V Enable Input Voltage (VEN).............................. 0V to VIN Junction Temperature (TJ) ................. –40°C to +125°C Junction Thermal Resistance Thin MLF-6 (θJA)...................................... 100°C/W TSOT-23-5 (θJA) ...................................... 235°C/W Electrical Characteristics(5) VIN = VOUT + 1.0V; COUT = 1.0µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless noted. Parameter Conditions Min Output Voltage Accuracy Variation from nominal VOUT Variation from nominal VOUT; –40°C to +125°C Typ Max Units -2.0 +2.0 % -3.0 +3.0 % Line Regulation VIN = VOUT + 1V to 6.0V; IOUT = 100µA 0.02 0.6 %/V Load Regulation, Note 6 IOUT = 100µA to 300mA 0.2 2.0 % Dropout Voltage, Note 7 IOUT = 50mA; VOUT ≥ 2.8V 17 mV IOUT = 150mA; VOUT ≥ 2.8V 50 100 mV IOUT = 300mA; VOUT ≥ 2.8V 110 200 mV Ground Pin Current, Note 8 IOUT = 0 to 300mA 85 150 µA Ground Pin Current in Shutdown VEN ≤ 0.2V 0.01 1 µA Ripple Rejection f = up to 1kHz; COUT = 1.0µF; CBYP = 0.1µF 75 f = 1kHz – 20kHz; COUT = 1.0µF; CBYP = 0.1µF 55 340 Current Limit VOUT = 0V Output Voltage Noise COUT = 1.0µF; CBYP = 0.1µF; 10Hz to 100kHz dB 500 dB 900 30 mA µVRMS Enable Input Enable Input Voltage 0.2 Logic Low 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 Turn-on Time COUT = 1.0µF; CBYP = 0.1µF; IOUT = 150mA 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. 5. Specification for packaged product only. 6. Regulation is measured at constant junction temperature using low duty cycle pulse testing, changes in output voltage due to heating effects are covered by the thermal regulation specification. 7. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V differential. For outputs below 2.3V, dropout voltage is the input-to-output differential with the minimum input voltage 2.3V. 8. Ground pin current is the regulation quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current. January 2007 5 M9999-011207 Micrel, Inc. MIC5318 Typical Characteristics Power Supply Rejection Ratio -100 -90 -80 -70 -60 300mA 150mA -50 -40 -30 VIN = VOUT + 1V -20 VOUT = 2.8V 50mA C = 1µF -10 COUT = 0.1µF BYP 0 0.1 1 10 100 1,000 FREQUENCY (kHz) 2.90 Output Voltage vs. Output Current 2.85 2.80 2.75 2.70 0 VIN = VOUT + 1V VOUT = 2.8V COUT = 1µF 50 100 150 200 250 300 OUTPUT CURRENT (mA) Ground Pin Current vs. Temperature 100 90 300mA 80 70 60 50 40 100µA 30 20 10 0 VIN = VOUT + 1V VOUT = 1.8V COUT = 1µF 2.1 2.5 1.9 2.0 1.8 1.5 1.7 600 580 560 540 520 500 480 460 440 420 400 2 2.5 3 3.5 4 4.5 5 5.5 6 INPUT VOLTAGE (V) January 2007 VIN = VOUT + 1V VOUT = 1.8V COUT = 1µF IOUT = 100µA 1.6 1.5 1.0 0.5 0 0 300mA VOUT = 2.8V COUT = 1µF 1 2 3 4 5 6 SUPPLY VOLTAGE (V) Dropout Voltage vs. Temperature Dropout Voltage vs. Output Current 300mA 150mA 50mA TEMPERATURE (°C) 10 100µA TEMPERATURE (°C) 140 130 COUT = 1µF 120 110 100 90 80 70 60 50 40 30 20 10 0 110 100 90 80 70 60 50 40 30 20 10 0 0 Output Voltage vs. Supply Voltage 3.0 2.0 TEMPERATURE (°C) Current Limit vs. Input Voltage Output Voltage vs. Temperature Ground Pin Current vs. Output Current VIN = VOUT + 1V VOUT = 2.8V COUT = 1µF 50 100 150 200 250 300 OUTPUT CURRENT (mA) 120 110 100 90 80 70 60 50 40 30 20 10 0 0 7 VOUT = 2.8V COUT = 1µF 50 100 150 200 250 300 OUTPUT CURRENT (mA) Ground Pin Current vs. Input Voltage 110 100 90 80 300mA 100µA 70 60 50 40 30 20 10 0 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 INPUT VOLTAGE (V) Output Noise Spectral Density 1 0.1 0.01 VIN = 4V VOUT = 2.8V COUT = 1µF CBYP = 0.1µF 0.001 0.01 0.1 1 10 100 1,000 10,000 FREQUENCY (kHz) 6 M9999-011207 Micrel, Inc. MIC5318 Functional Characteristics Line Transient Enable Turn-On Enable (0.5V/div) Input Voltage (2V/div) 6V 3V VOUT = 1.8V COUT = 1µF CBYP = 0.1µF Output Voltage (50mV/div) Output Voltage (1V/div) VIN = VOUT + 1V VOUT = 2.8V COUT = 1µF CBYP = 0.1µF IOUT = 10mA Time (10µs/div) Time (40µs/div) Output Voltage (50mVV/div) Load Transient 300mA VIN = VOUT + 1V Output Current (100mA/div) VOUT = 2.8V COUT = 1µF 10mA Time (40µs/div) January 2007 7 M9999-011207 Micrel, Inc. MIC5318 bypass capacitance. A unique, quick-start circuit allows the MIC5318 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Refer to the Typical Characteristics subsection for performance with different bypass capacitors. Application Information Enable/Shutdown The MIC5318 comes with an active-high enable pin that allows the regulator to be disabled. 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. No-Load Stability Unlike many other voltage regulators, the MIC5318 will remain stable and in regulation with no load. This is especially crucial for CMOS RAM keep-alive applications. Adjustable Regulator Application Adjustable regulators use the ratio of two resistors to multiply the reference voltage to produce the desired output voltage. The MIC5318 can be adjusted from 1.25V to 5.5V by using two external resistors (Figure 1). The resistors set the output voltage based on the following equation: Input Capacitor The MIC5318 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. R1 ⎞ ⎛ VOUT = VREF ⎜1 + ⎟ R2 ⎠ ⎝ VREF = 1.25V MIC5318YMT VIN Output Capacitor The MIC5318 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. R1 1µF EN ADJ GND 1µF R2 Figure 1. Adjustable Voltage Output Thermal Considerations The MIC5318 is designed to provide 300mA of continuous current. 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 and the output current = 300mA. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN – VOUT) IOUT + 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. PD = (3.3V – 2.8V) × 300mA PD = 0.15W To determine the maximum ambient operating temperature of the package, use the junction-toambient thermal resistance of the device and the following basic equation: Bypass Capacitor A capacitor can be placed from the noise bypass pin to ground 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 January 2007 VOUT VIN VOUT 8 M9999-011207 Micrel, Inc. MIC5318 PD(MAX) = ⎛ ⎝ The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5318-2.8YMT at an input voltage of 3.3V and 300mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.15W = (125°C – TA)/(100°C/W) TA = 110°C Therefore, a 2.8V application with 300mA of output current can accept an ambient operating temperature of 110°C in a 1.6mm x 1.6mm 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 LowDropout Voltage Regulators handbook. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf 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 MIC5318 in the 6-pin 1.6mm x 1.6mm Thin MLF® package. θJA Recommended Minimum Footprint Package 6-Pin 1.6x1.6 Thin MLF ® 100°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. January 2007 9 M9999-011207 Micrel, Inc. MIC5318 Package Information ® 6-Pin 1.6mm x 1.6mm Thin MLF (MT) 5-Pin TSOT-23 (D5) January 2007 10 M9999-011207 Micrel, Inc. MIC5318 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. © 2006 Micrel, Inc. January 2007 11 M9999-011207