MIC5319 Micrel, Inc. MIC5319 500mA Cap Ultra-Low Dropout High PSRR LDO Regulator General Description Features The MIC5319 is a high-performance, 500mA LDO regulator, offering extremely high PSRR and very low noise while consuming low ground current. Ideal for battery-operated applications, the MIC5319 features 1% accuracy, extremely low-dropout voltage (200mV @ 500mA), and low ground current at light load (typically 90A). Equipped with a logic-compatible enable pin, the MIC5319 can be put into a zero-off-mode current state, drawing no current when disabled. The MIC5319 is a Cap design operating with very small ceramic output capacitors for stability, thereby reducing required board space and component cost. The MIC5319 is available in fixed-output voltages and adjustable output voltages in the super-compact 2mm x 2mm MLF(R) leadless package and thin SOT-23-5 package. Additional voltage options are available. Contact Micrel marketing. All support documentation can be found on Micrel's web site at www.micrel.com. * * * * * * * * * * * * * Ultra-low dropout voltage 200mV @ 500mA Input voltage range: 2.5 to 5.5V Stable with ceramic output capacitor Low output noise -- 40Vrms Low quiescent current of 90A total High PSRR, up to 70dB @1kHz Fast turn-on-time -- 40s typical High output accuracy: * 1.0% initial accuracy * 2.0% over temperature Thermal shutdown protection Current-limit protection Logic-controlled Enable Tiny 2mm x 2mm MLF(R) package, 500mA continuous Thin SOT-23-5 package, 500mA peak Applications * * * * * * Cellular phones PDAs Fiber optic modules Portable electronics Notebook PCs Audio Codec power supplies Typical Application MIC5319 VIN 2.8V@500mA VOUT VIN VOUT 1F EN BYP 0.1F 2.2F 200 180 160 140 120 100 80 60 40 20 0 Dropout Voltage vs. Output Current Vout = 2.8V Cout = 2.2F 0 100 200 300 400 500 OUTPUT CURRENT (mA) GND PSRR (Bypass Pin Cap = 0.1F) 100 90 80 70 60 50 40 30 20 10 0 10 50mA 100A 500mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2F 1k 100 10k 100k FREQUENCY (Hz) 1M MicroLeadFrame and MLF 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 March 2008 1 M9999-032808 MIC5319 Micrel, Inc. Ordering Information Part Number Standard Marking Voltage(2) Junction Temp. Range Package 13H 1.375V -40C to +125C 6-pin 2mm x 2mm MLF(R) 918 1.8V -40C to +125C 6-pin 2mm x 2mm MLF(R) 91J 1.85V -40C to +125C 6-pin 2mm x 2mm MLF(R) 925 2.5V -40C to +125C 6-pin 2mm x 2mm MLF(R) MIC5319-2.6YML 926 2.6V -40C to +125C 6-pin 2mm x 2mm MLF(R) MIC5319-2.7YML 927 2.7V -40C to +125C 6-pin 2mm x 2mm MLF(R) 928 2.8V -40C to +125C 6-pin 2mm x 2mm MLF(R) MIC5319-2.9YML 929 2.9V -40C to +125C 6-pin 2mm x 2mm MLF(R) MIC5319-3.0YML 930 3.0V -40C to +125C 6-pin 2mm x 2mm MLF(R) Pb-Free Standard MIC5319-1.3HYML MIC5319-1.8BML MIC5319-1.8YML 918 MIC5319-1.85YML MIC5319-2.5BML MIC5319-2.8BML MIC5319-2.5YML 925 MIC5319-2.8YML 928 Pb-Free(1) MIC5319-3.3BML MIC5319-3.3YML 933 933 3.3V -40C to +125C 6-pin 2mm x 2mm MLF(R) MIC5319-5.0BML MIC5319-5.0YML 950 950 5.0V -40C to +125C 6-pin 2mm x 2mm MLF(R) MIC5319BML MIC5319YML 9AA 9AA ADJ -40C to +125C 6-pin 2mm x 2mm MLF(R) MIC5319-1.3HYD5 N13H 1.375V -40C to +125C Thin SOT-23-5 MIC5319-1.8YD5 N918 1.8V -40C to +125C Thin SOT-23-5 MIC5319-1.85YD5 N91J 1.85V -40C to +125C Thin SOT-23-5 MIC5319-2.5YD5 N925 2.5V -40C to +125C Thin SOT-23-5 MIC5319-2.6YD5 N926 2.6V -40C to +125C Thin SOT-23-5 N927 2.7V -40C to +125C Thin SOT-23-5 N928 2.8V -40C to +125C Thin SOT-23-5 MIC5319-2.9YD5 N929 2.9V -40C to +125C Thin SOT-23-5 MIC5319-3.0YD5 N930 3.0V -40C to +125C Thin SOT-23-5 N933 3.3V -40C to +125C Thin SOT-23-5 N950 5.0V -40C to +125C Thin SOT-23-5 MIC5319-2.7YD5 MIC5319-2.8BD5 MIC5319-3.3BD5 MIC5319-2.8YD5 MIC5319-3.3YD5 N928 N933 MIC5319-5.0YD5 Notes: 1. Under-bar/Over-bar symbols may not be to scale. 2. For other output voltage options, contact Micrel marketing. March 2008 2 M9999-032808 MIC5319 Micrel, Inc. Pin Configuration EN 1 GND 2 VIN 3 6 BYP 5 NC 4 VOUT EN 1 6 BYP GND 2 5 ADJ VIN 3 4 VOUT MIC5319BML/YML (Adjustable) 6-Pin 2mm x 2mm MLFTM (ML) (Top View) MIC5319-x.xBML/YML 6-Pin 2mm x 2mm MLFTM (ML) (Top View) EN GND VIN 2 3 1 KWxx 4 5 BYP VOUT MIC5319-x.xBD5/YD5 TSOT-23-5 (D5) (Top View) Pin Description Pin Number MLF-6 Fixed Pin Number MLF-6 Adj. Pin Number TSOT-23-5 Fixed Pin Name 1 1 3 EN 2 2 2 GND Ground. 3 3 1 VIN Supply Input. 4 4 5 VOUT - 5 5 - - ADJ NC Adjust Input: Connect to external resistor voltage divider network. No connection for fixed voltage parts. 6 6 4 BYP Reference Bypass: Connect external 0.1F to GND for reduced output noise. May be left open. HS Pad HS Pad - EPAD March 2008 Pin Function Enable Input. Active High. High = on, low = off. Do not leave floating. Output voltage. Exposed Heatsink Pad connected to ground internally. 3 M9999-032808 MIC5319 Micrel, Inc. Absolute Maximum Ratings(1) Operating Ratings(2) Supply Input Voltage (VIN) ......................................0V to 6V Enable Input Voltage (VEN) ....................................0V to 6V Power Dissipation (PD) .........................Internally Limited(3) Junction Temperature(TJ) ......................... -40C to +125C Storage Temperature (TS) .......................... -65C to 150C Lead Temperature (soldering, 5 sec.) ........................ 260C ESD(4) ............................................................................................... 3kV Supply Input Voltage (VIN) ...............................2.5V to 5.5V Enable Input Voltage (VEN) ...................................0V to VIN Junction Temperature (TJ) ........................ -40C to +125C Package Thermal Resistance MLFTM (JA) ......................................................... 93C/W TSOT-23 (JA) ................................................... 235C/W Electrical Characteristics(5) VIN = VOUT +1.0V; COUT = 2.2F, IOUT = 100A; TJ = 25C, bold values indicate -40C to + 125C; unless noted. Parameter Condition Min Output Voltage Accuracy Variation from nominal VOUT -1.0 Feedback Voltage Load Regulation(6) Dropout Voltage(7)(8) Ground Pin Current(9) Ground Pin Current in Shutdown Ripple Rejection Current Limit Output Voltage Noise Turn-On Time Enable Input -2.0 Max Units +1.0 % +2.0 % 1.2375 1.25 1.2625 V 1.225 1.25 1.275 V 0.04 0.3 %/V IOUT = 100A to 500mA 0.1 0.5 % 20 40 mV IOUT = 500mA 200 400 mV 90 150 A VEN 0.2V 0.5 A 70 dB Variation from nominal VOUT, IOUT = 100A to 500mA (ADJ option) Line Regulation Typ VIN = VOUT +1V to 5.5V IOUT = 50mA IOUT = 0 to 500mA f = up to 1kHz; COUT = 2.2F ceramic; CBYP = 0.1F f = 10kHz; COUT = 2.2F ceramic; CBYP = 0.1F VOUT = 0V 600 COUT =2.2F, CBYP = 0.1F, 10Hz to 100kHz Logic Low (Regulator Shutdown) Enable Input Current VIL 0.2V (Regulator Shutdown) Logic High (Regulator Enabled) VIH 1.0V (Regulator Enabled) dB mA 40 COUT = 2.2F; CBYP = 0.01F Enable Input Voltage 60 700 Vrms 100 s 0.2 V 0.01 1 A 0.01 1 A 40 1.2 V Notes: 1. Exceeding maximum ratings may damage the device. 2. The device is not guaranteed to work outside its operating rating. 3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max) - TA) / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator may 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. 7. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal VOUT. For outputs below 2.5V, dropout voltage spec does not apply, as part is limited by minimum VIN spec of 2.5V. There may be some typical dropout degradation at VOUT <3V. 8. For ADJ option, VOUT = 3V for dropout specification. 9. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current. March 2008 4 M9999-032808 MIC5319 Micrel, Inc. Typical Characteristics 90 50mA 100A 500mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2F 1k 100 10k 100k FREQUENCY (Hz) 1M Ground Current vs. Temperature PSRR (Bypass Pin Cap = 0.01F) 100 90 80 70 60 50 40 30 20 10 0 10 90 100A 500mA 50mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2F 1k 100 10k 100k FREQUENCY (Hz) 1M Ground Current vs. Temperature 85 GROUND CURRENT (A) PSRR (Bypass Pin Cap = 0.1F) 100 90 80 70 60 50 40 30 20 10 0 10 80 75 70 65 60 55 0.1 90 80 80 80 70 70 70 60 60 60 50 50 50 40 40 40 30 30 20 10 Iload = 50mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2 F 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) Ground Current vs. Temperature 100 90 80 70 60 50 40 30 Iload = 500mA 20 Vout = 2.8V Vin = Vout + 1V 10 Cout = 2.2 F 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 90 Ground Current vs. Input Voltage 80 70 60 March 2008 100 90 80 70 60 50 40 30 20 10 0 3 Ground Current vs. Input Voltage Iload = 50mA Vout = 2.8V Cout = 2.2 F 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) Iload = 500mA Vout = 2.8V Cout = 2.2F 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) 30 20 10 100 90 80 70 60 50 40 30 20 10 0 3 Dropout Characteristics 30 2.5 25 Ground Current vs. Temperature Iload = 300mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2 F Ground Current vs. Input Voltage Iload = 150mA Vout = 2.8V Cout = 2.2 F 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) Dropout Voltage vs. Temperature 20 150mA 500mA 15 10 Iload = 50mA Vout = 2.8V Cout = 2.2F 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 5 0.5 0 0 Vout = 2.8V Vin = Vout + 1V Cout = 2.2uF Cbyp = 0.01F 1 10 100 1000 OUTPUT CURRENT (mA) 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 3 1 50mA 30 0 3 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 1.5 40 10 10 2 50 20 Iload = 150mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2 F 20 Ground Current vs. Output Current 1 2 3 4 5 INPUT VOLTAGE (V) 5 M9999-032808 MIC5319 Micrel, Inc. 80 Dropout Voltage vs. Temperature 250 70 200 60 50 150 40 100 30 20 Iload = 150mA Vout = 2.8V Cout = 2.2F 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 10 700 Short Circuit Current vs. Input Voltage 500 400 300 100 3 10 Iload = 100A Vout = 2.8V Cout = 2.2F 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) 50 Iload = 500mA Vout = 2.8V Cout = 2.2F 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 3 600 200 Dropout Voltage vs. Temperature 6 Output Voltage vs. Temperature 200 180 160 140 120 100 80 60 40 20 0 1.6 2.95 1.4 2.9 1.2 2.85 1 2.8 0.8 2.75 0.6 2.7 0.4 2.65 0.2 Iload = 100A Vout = 2.8V Vin = Vout + 1V 2.6 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) Dropout Voltage vs. Temperature Vout = 2.8V Cout = 2.2F 0 100 200 300 400 500 OUTPUT CURRENT (mA) Enable Threshold vs. Temperature Iload = 100 A Vout = 2.8V Vin = Vout + 1V Cout = 2.2 F 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) Output Noise Spectral Density 1 0.1 Iload = 50 Vout = 2.8V 0.01 Vin = 4.45V Cout = 2.2F Cbyp = 0.01F 0.001 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) March 2008 6 M9999-032808 MIC5319 Micrel, Inc. Functional Characteristics March 2008 7 M9999-032808 MIC5319 Micrel, Inc. Functional Diagram VIN VOUT EN VREF QuickStart Error Amp BYP Thermal Shutdown Current Limit MIC5319 GND MIC5319 Block Diagram - Fixed VOUT VIN EN VREF QuickStart Error Amp BYP ADJ Thermal Shutdown Current Limit MIC5319 GND MIC5319 Block Diagram - Adjustable March 2008 8 M9999-032808 MIC5319 Micrel, Inc. Applications Information No-Load Stability Unlike many other voltage regulators, the MIC5319 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 MIC5319 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: Enable/Shutdown The MIC5319 features 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, as this may cause an indeterminate state on the output. Input Capacitor The MIC5319 is a high-performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 1F capacitor is required from the input- toground to provide stability. Low-ESR ceramic capacitors provide optimal performance at a minimum of space. Additional high frequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out high-frequency noise and are good design practice in any RF-based circuit. Output Capacitor The MIC5319 requires an output capacitor of 2.2F 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 2.2F 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. Bypass Capacitor A capacitor can be placed from the bypass pin-to-ground to reduce output voltage noise. The capacitor bypasses the internal reference. A 0.1F 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. A unique, quick-start circuit allows the MIC5319 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Refer to the "Typical Characteristics" section for performance with different bypass capacitors. March 2008 R1 VOUT = VREF 1 + R2 VREF = 1.25V VIN 1F MIC5319BML VOUT VIN VOUT EN R1 BYP ADJ GND R2 2.2F Figure 1. Adjustable Voltage Application Thermal Considerations The MIC5319 is designed to provide 500mA of continuous current in a very small MLF package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. Given an input voltage of 3.3V, output voltage of 2.8V and output current = 500mA, the actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN - VOUT) IOUT + VIN x IGND Because this device is CMOS and the ground current is typically <100A 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) x 500mA PD = 0.25W 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: T (max) - TA PD (max) = J JA TJ(max) = 125C, the maximum junction temperature of the die JA thermal resistance = 93C/W. 9 M9999-032808 MIC5319 Micrel, Inc. Table 1 shows junction-to-ambient thermal resistance for the MIC5319 in the 2mm x 2mm MLF package. Package JA Recommended Minimum Footprint JC 2 x 2 MLF(R) 93C/W 2C/W SOT-23-5 235C/W 0.25W = TA = 101.75C Therefore, a 2.8V application at 500mA of output current can accept an ambient operating temperature of 101.75C in a 2mm x 2mm 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 Table 1. Thermal Resistance Substituting 0.25W for PD(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The maximum power dissipation must not be exceeded for proper operation. March 2008 125C - TA 93C /W 10 M9999-032808 MIC5319 Micrel, Inc. Package Information 6-Pin 2mm x 2mm MLF(R) (ML) TSOT-23-5 (D5) 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 at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2004 Micrel, Incorporated. March 2008 11 M9999-032808