MIC5353 500mA LDO in 1.6mm × 1.6mm Package General Description Features The MIC5353 is a high-performance, single-output, ultralow LDO (ULDO™) regulator, offering a low total output noise of 30μVRMS. The MIC5353 is capable of sourcing 500mA output current and offers high-PSRR and lowoutput noise, making it an ideal solution for RF applications. The MIC5353 provides 2% accuracy, extremely low dropout voltage (160mV @ 500mA), and low ground current (typically 90µA) making it ideal for battery-operated applications. When disabled, the MIC5353 enters a zerooff-mode current state, thereby drawing almost no current. The MIC5353 is available in the 1.6mm x 1.6mm Thin MLF® package, occupying only 2.56mm2 of PCB area, a 36% reduction in board area compared to SC-70 and 2mm x 2mm Thin MLF® packages. The MIC5353 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® package. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • • • • • • • • • • 500mA guaranteed output current Input voltage range: 2.6V to 6V Ultra low dropout voltage: 160mV @ 500mA ± 2% initial accuracy Ultra low output noise: 30µVrms Low quiescent current: 90µA Stable with ceramic output capacitors 35µs turn-on time Thermal shutdown and current limit protection Tiny 6-pin 1.6mm x 1.6mm Thin MLF® leadless package Applications • • • • • Mobile Phones GPS, PDAs, PMP, handhelds Portable electronics Digital still and video cameras Digital TV _________________________________________________________________________________________________________________________ Typical Application 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 May 2010 M9999-052510 Micrel, Inc. MIC5353 Ordering Information Marking Code(1) Output Voltage(2) Temperature Range Package MIC5353-1.8YMT 18R 1.8V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF® MIC5353-2.5YMT 25R 2.5V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF® MIC5353-2.6YMT 26R 2.6V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF® MIC5353-2.8YMT 28R 2.8V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF® MIC5353-3.0YMT 30R 3.0V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF® MIC5353-3.3YMT 33R 3.3V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF® MIC5353YMT AAR ADJ –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF® Part Number 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 6-Pin 1.6mm × 1.6mm Thin MLF® (MT) Fixed (TOP VIEW) 6-Pin 1.6mm × 1.6mm Thin MLF®(MT) Adjustable (TOP VIEW) Pin Description Pin Number Thin MLF-6 Fixed Pin Number Thin MLF-6 Adjustable Pin Name 1 1 EN 2 2 GND Ground. 3 3 VIN Supply Input. 4 4 VOUT Output Voltage. 5 – NC No connection. – 5 ADJ Adjust Input. Connect to external resistor voltage divider network. Reference Bypass: Connect external 0.1μF to GND for reduced Output Noise. May be left open. 6 6 BYP EPad EPad HS PAD May 2010 Pin Function Enable Input. Active High. High = ON, low = OFF. Do not leave floating. Exposed Heat-sink Pad connected to ground internally. 2 M9999-052510 Micrel, Inc. MIC5353 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) ..................................... −0.3V to +6.5V Enable Input Voltage (VEN)................................−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 +6.0V Enable Input Voltage (VEN) ...................................... 0V to VIN Junction Temperature (TJ) .......................... −40°C to +125°C Junction Thermal Resistance 6-Pin 1.6mm x1.6mm Thin MLF® (θJA) ...........92.4°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 Output Voltage Accuracy Conditions Min. -2.0 +2.0 Variation from nominal VOUT; –40°C to +125°C -3.0 +3.0 VIN = VOUT + 1V to 6V; IOUT = 100µA Load Regulation IOUT = 100µA to 500mA 0.05 Units % 0.3 %/V 0.6 0.15 2.0 IOUT = 150mA 50 100 IOUT = 300mA 100 200 IOUT = 500mA 160 350 90 175 µA 0.01 2 µA Ground Pin Current IOUT = 0 to 500mA Ground Pin Current in Shutdown VEN ≤ 0.2V Ripple Rejection Max. Variation from nominal VOUT Line Regulation Dropout Voltage (6) Typ. f = 1kHz; COUT = 1.0µF; CBYP = 0.1µF 60 f = 20kHz; COUT = 1.0µF; CBYP = 0.1µF 45 Current Limit VOUT = 0V 600 Output Voltage Noise COUT = 1.0µF; CBYP = 0.1µF; 10Hz to 100kHz 1100 % mV dB 1600 30 mA µVRMS Enable Input Enable Input Voltage Enable Input Current 0.2 Logic Low 1.2 Logic High VIL ≤ 0.2V 0.01 1 VIH ≥ 1.2V 0.01 1 35 100 V µA Turn-on Time Turn-on Time COUT = 1.0µF; CBYP = 0.1µF 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 value measured at 1V differential. May 2010 3 M9999-052510 Micrel, Inc. MIC5353 Functional Diagram MIC5353 Block Diagram – FIXED MIC5353 Block Diagram – ADJUSTABLE May 2010 4 M9999-052510 Micrel, Inc. MIC5353 Typical Characteristics 200 180 DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) Dropout Voltage vs. Temperature 250 160 140 120 100 80 60 40 90 200 500mA 150 300mA 100 50 0 0 Ground Current vs. Temperature 20 40 60 0 80 100 120 140 100 IOUT = 500mA 90 IOUT = 100μA 70 1.81 1.8 1.79 1.78 VIN =2.8V 1.77 COUT=CIN =1μF 0 60 80 3.2 100μA 3 2.8 2.6 500mA 2.4 300mA 100 120 140 50 150mA 2.6 100 150 200 250 300 350 400 450 500 OUTPUT CURRENT(mA) Current Limit vs. Input Voltage V OUT = 2.8V CIN = COUT = 1μF 2.2 3 3.4 3.8 4.2 4.6 5 5.4 5.8 INPUT VOLTAGE (V) TEMPERATURE (°C) 1.4 500 3.4 2 1.76 40 400 3.6 1.82 60 300 Output Voltage vs. Input Voltage OUTPUT VOLTAGE (V) OUTPUT VOLTAGE(V) GROUND CURRENT (μA) 110 200 Output Current(mA) 1.83 20 100 Output Voltage vs. Output Current 1.84 120 0 VOUT = 2.8V VIN = 3.8V TEMPERATURE (°C) OUTPUT CURRENT (mA) -20 84 80 -40 -20 50 100 150 200 250 300 350 400 450 500 -40 86 150mA 0 80 88 82 20 0 Ground Current vs. Output Current 92 Ground Current(μA) Dropout Voltage vs. Output Current Output Noise Spectral Density PSRR 10 -100 -90 1.2 500µA -80 1 -70 1.1 Noise uV/√Hz 100µA -60 VOUT =2.8V 1 dB CURRENT LIMIT(mA) 1.3 CIN=COUT =1μF -50 300µA -40 0.9 0.1 -30 0.8 2.5 3 3.5 4 4.5 5 INPUT VOLTAGE(V) 5.5 6 VIN = 4.5V COUT = 1µF VOUT = 1.8V ILOAD = 50mA CBYP = 0.1µF 0.01 -20 COUT = 1µF CBYP = 0.1µF -10 0 10 100 1,000 10,000 100,000 1,000,000 10,000,000 0.001 10 100 1,000 10,000 100,000 1,000,000 10,000,000 FREQUENCY (Hz) FREQUENCY (Hz) May 2010 5 M9999-052510 Micrel, Inc. MIC5353 Functional Characteristics May 2010 6 M9999-052510 Micrel, Inc. MIC5353 A unique, quick-start circuit allows the MIC5353 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Applications Information Enable/Shutdown The MIC5353 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 MIC5353 will remain stable and in regulation with no load. This is especially important in 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 MIC5353 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 MIC5353 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. The use of additional high-frequency capacitors, such as smallvalued NPO dielectric-type capacitors, help filter out high-frequency noise and are good practice in any RFbased circuit. R1 ⎞ ⎛ VOUT = VREF ⎜1 + ⎟ R2 ⎠ ⎝ VREF = 1.25V Output Capacitor The MIC5353 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, although performance has been optimized for a 1µF ceramic output capacitor and doing so does not improve significantly with larger capacitance. X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. The 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 thereby ensuring the same minimum capacitance over the equivalent operating temperature range. Figure 1. Adjustable Voltage Output Thermal Considerations The MIC5353 is designed to provide 500mA 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 = 500mA. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN – VOUT) IOUT + VIN IGND 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. May 2010 7 M9999-052510 Micrel, Inc. MIC5353 The maximum power dissipation must not be exceeded for proper operation. 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: For example, when operating the MIC5353-2.8YMT at an input voltage of 3.3V and 500mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: PD = (3.3V – 2.8V) × 500mA PD = 0.25W 0.25W = (125°C – TA)/(92.4°C/W) 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) = ⎛ ⎝ TA=101°C Therefore, a 2.8V application with 500mA of output current can accept an ambient operating temperature of 101°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 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) - TA JA TJ(max) = 125°C, the maximum junction temperature of the die θJA thermal resistance = 92.4°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-toambient thermal resistance for the minimum footprint is 92.4°C/W. May 2010 8 M9999-052510 Micrel, Inc. MIC5353 Typical Application Schematic (Fixed Output) Bill of Materials Item C1,C3 C2 U1 Part Number 06036D105KAT2A GRM188R60J105KE19D 06035C104KAT2A GRM188R71H104KA93D MIC5353-XXYMT Manufacturer Description Qty. (1) AVX muRata (2) AVX(1) (2) muRata Micrel, Inc.(3) Capacitor, 1µF Ceramic, 6.3V, X5R, Size 0603 2 Capacitor, 0.1µF Ceramic, 50V, X5R, Size 0603 1 500mA LDO, 1.6mm x 1.6mm Thin MLF® 1 Notes: 1. AVX: www.avx.com. 2. Murata Tel: www.murata.com. 3. Micrel, Inc.: www.micrel.com. May 2010 9 M9999-052510 Micrel, Inc. MIC5353 Typical Application Schematic (Adjustable Output) Bill of Materials Item C1,C3 C2 Part Number 06036D105KAT2A GRM188R60J105KE19D 06035C104KAT2A Manufacturer Description AVX muRata (2) AVX(1) (2) Capacitor, 1µF Ceramic, 6.3V, X5R, Size 0603 2 Capacitor, 0.1µF Ceramic, 50V, X5R, Size 0603 1 1 GRM188R71H104KA93D muRata R1 CRCW060320K0FKEA Vishay(3) Resistor, 20kΩ, 1%, 1/16W, Size 0603 R2 CRCW060310K0FKEA Vishay(3) Resistor, 10kΩ, 1%, 1/16W, Size 0603 U1 MIC5353YMT Qty. (1) Micrel, Inc. (4) Adjustable 500mA LDO, 1.6mm x 1.6mm Thin MLF 1 ® 1 Notes: 1. AVX: www.avx.com. 2. Murata Tel: www.murata.com. 3. Vishay Tel: www.vishay.com. 4. Micrel, Inc.: www.micrel.com. May 2010 10 M9999-052510 Micrel, Inc. MIC5353 PCB Layout Recommendations TOP LAYER BOTTOM LAYER May 2010 11 M9999-052510 Micrel, Inc. MIC5353 Package Information 6-Pin 1.6mm x 1.6mm 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. © 2010 Micrel, Incorporated. May 2010 12 M9999-052510