MIC5319 500mA µCap 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 90µA). 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 µCap 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® leadless package and thin SOT-23-5 package. Data sheets and 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: 40µVrms Low quiescent current of 90µA total High PSRR, up to 70dB @1kHz Fast turn-on-time: 40µs 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® 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 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. MIC5319 Ordering Information Pb-Free(1) (V) Junction Temperature Range 13H 1.375 −40°C to +125°C 6-Pin 2mm × 2mm MLF® 918 1.8 −40°C to +125°C 6-Pin 2mm × 2mm MLF® 91J 1.85 −40°C to +125°C 6-Pin 2mm × 2mm MLF® 925 2.5 −40°C to +125°C 6-Pin 2mm × 2mm MLF® MIC5319-2.6YML 926 2.6 −40°C to +125°C 6-Pin 2mm × 2mm MLF® MIC5319-2.7YML 927 2.7 −40°C to +125°C 6-Pin 2mm × 2mm MLF® 928 2.8 −40°C to +125°C 6-Pin 2mm × 2mm MLF® MIC5319-2.9YML 929 2.9 −40°C to +125°C 6-Pin 2mm × 2mm MLF® MIC5319-3.0YML 930 3.0 −40°C to +125°C 6-Pin 2mm × 2mm MLF® Part Number Standard Pb-Free Marking 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 Voltage(2) Package MIC5319-3.3BML MIC5319-3.3YML 933 933 3.3 −40°C to +125°C 6-Pin 2mm × 2mm MLF® MIC5319-5.0BML MIC5319-5.0YML 950 950 5.0 −40°C to +125°C 6-Pin 2mm × 2mm MLF® MIC5319BML MIC5319YML 9AA 9AA ADJ −40°C to +125°C 6-Pin 2mm × 2mm MLF® MIC5319-1.3HYD5 N13H 1.375 −40°C to +125°C Thin SOT-23-5 MIC5319-1.8YD5 N918 1.8 −40°C to +125°C Thin SOT-23-5 MIC5319-1.85YD5 N91J 1.85 −40°C to +125°C Thin SOT-23-5 MIC5319-2.5YD5 N925 2.5 −40°C to +125°C Thin SOT-23-5 MIC5319-2.6YD5 N926 2.6 −40°C to +125°C Thin SOT-23-5 MIC5319-2.7YD5 N927 2.7 −40°C to +125°C Thin SOT-23-5 N928 2.8 −40°C to +125°C Thin SOT-23-5 MIC5319-2.9YD5 N929 2.9 −40°C to +125°C Thin SOT-23-5 MIC5319-3.0YD5 N930 3.0 −40°C to +125°C Thin SOT-23-5 N933 3.3 −40°C to +125°C Thin SOT-23-5 N950 5.0 −40°C to +125°C Thin SOT-23-5 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. May 2010 2 M9999-052510 Micrel, Inc. MIC5319 Pin Configuration MIC5319-x.xBML/YML 6-Pin 2mm × 2mm MLF® (ML) Top View MIC5319BML/YML (Adjustable) 6-Pin 2mm × 2mm MLF® (ML) Top View MIC5319-x.xBD5/YD5 TSOT-23-5 (D5) Top View Pin Description Pin Number MLF®-6 Fixed Pin Number MLF®-6 Adjustable Pin Number TSOT-23-5 Fixed Pin Name 1 1 3 EN 2 2 2 GND Ground. Supply Input. Pin Name Enable Input: Active High. High = ON, Low = OFF. Do not leave floating. 3 3 1 VIN 4 4 5 VOUT − 5 − ADJ Adjustable Input: Connect to external resistor voltage divider network. 5 − NC No connection for fixed voltage parts 6 6 4 BYP Reference Bypass: Connect external 0.1µF to GND for reduced output noise. May be left open. HS Pad HS pad − EPAD May 2010 Output Voltage. Exposed Heatsink Pad connected to ground internally 3 M9999-052510 Micrel, Inc. MIC5319 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) ........................ −40°C to +125°C Storage Temperature (TS)......................... −65°C to +150°C Lead Temperature (soldering, 5sec.)......................... 260°C ESD Rating(4) .................................................................. 3kV Supply Input Voltage (VIN)............................ +2.5V to +5.5V Enable Input Voltage (VEN)..................................... 0V to VIN Junction Temperature (TJ) ........................ −40°C to +125°C Package Thermal Resistance MLF® (θJA)..........................................................93°C/W TSOT-23 (θJA) ..................................................235°C/W Electrical Characteristics(4) VIN = VOUT +1.0V; COUT = 2.2µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless noted. Parameter Output Voltage Accuracy Condition Min. Typ. Max. Variation from nominal VOUT −1.0 +1.0 Variation from nominal VOUT, IOUT = 100mA to 500mA −2.0 +2.0 Units % Feedback Voltage 1.2375 1.25 1.2625 (ADJ Option) 1.225 1.25 1.275 VIN = VOUT +1V to 5.5V 0.04 0.3 %/V IOUT = 100µA to 500mA 0.1 0.5 % IOUT = 50mA 20 40 IOUT = 500mA 200 400 Ground Pin Current(9) IOUT = 0 to 500mA 90 150 Ground Pin Current in Shutdown VEN ≤ 0.2V 0.5 f = up to 1kHz; COUT = 2.2µF ceramic; CBYP = 0.1 µF 70 f = 10kHz; COUT = 2.2µF ceramic; CBYP = 0.1 µF 60 Line Regulation (6) Load Regulation Dropout Voltage(7, 8) Ripple Rejection Current Limit VOUT = 0V Output Voltage Noise Turn-On Time Enable Input Voltage Enable Input Current V mV µA µA dB 700 mA COUT = 2.2µF; CBYP = 0.1 µF; 10Hz to 100kHz 40 µVrms COUT = 2.2µF; CBYP = 0.1 µF 40 600 Logic Low (Regulator Shutdown) 100 0.2 Logic High (Regulator Enabled) 1.2 VIL = ≤ 0.2V (Regulator Shutdown) 0.01 1 VIH = ≥ 1.0V (Regulator Shutdown) 0.01 1 µs V µA 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 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. May 2010 4 M9999-052510 Micrel, Inc. MIC5319 Typical Characteristics May 2010 5 M9999-052510 Micrel, Inc. MIC5319 Typical Characteristics (Continued) May 2010 6 M9999-052510 Micrel, Inc. MIC5319 Functional Characteristics May 2010 7 M9999-052510 Micrel, Inc. MIC5319 Functional Diagram MIC5319 Block Diagram − Fixed MIC5319 Block Diagram − Adjustable May 2010 8 M9999-052510 Micrel, Inc. MIC5319 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. Applications Information 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. 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: Input Capacitor The MIC5319 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 high-frequency noise and are good design practice in any RF-based circuit. ⎛ R1 ⎞ VOUT = VREF ⎜1 + ⎟ ⎝ R2 ⎠ VREF = 1.25V Output Capacitor The MIC5319 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 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. 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: 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 0.1µF 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 PD = (VIN − VOUT)IOUT + VIN × IGND 9 M9999-052510 Micrel, Inc. MIC5319 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: 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. PD = (3.3V − 2.8V) × 500mA 0.25W = PD = 0.25W 125°C − TA 93°C/W TA = 101.75°C Therefore, a 2.8V application at 500mA of output current can accept an ambient operating temperature of 101.75°C 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: www.micrel.com/_PDF/other/LDOBk_ds.pdf 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: ⎛ TJ(max) − TA ⎞ PD(max) = ⎜ ⎟ θJA ⎝ ⎠ TJ(max) = 125°C, the maximum junction temperature of the die. θJA thermal resistance = 93°C/W. Table 1 shows junction-to-ambient thermal resistance for the MIC5319 in the 2mm x 2mm MLF® package. θJA Recommended Minimum Footprint θJC 2mm × 2mm MLF® 93°C/W 45°C/W SOT-23-5 235°C/W Package Table 1. Thermal Resistance May 2010 10 M9999-052510 Micrel, Inc. MIC5319 Package Information 6-Pin 2mm × 2mm MLF® (ML) May 2010 11 M9999-052510 Micrel, Inc. MIC5319 Package Information (Continued) 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 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