MIC5319 Micrel 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. 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 — 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 MIC5319 VIN 2.8V@500mA VOUT VIN VOUT 1µF EN BYP 0.1µF DROPOUT VOLTAGE (mV) Typical Application Dropout Voltage 200 180 160 140 120 100 80 60 40 20 Vout = 2.8V Cout = 2.2uF 0 2.2µF 0 GND 100 200 300 400 500 OUTPUT CURRENT (mA) 100 PSRR (Bypass Pin Cap = 0.1µF) PSRR (dB) 90 80 70 50mA 100µA 60 50 40 30 20 10 0 10 500mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2uF 1k 100 10k 100k FREQUENCY (Hz) 1M MicroLeadFrame and MLF are 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 October 2004 1 M9999-100604 MIC5319 Micrel Ordering Information Marking Voltage Junction Temp. Range(1) MIC5319-2.8BD5 N928 2.8 –40°C to +125°C Thin SOT23-5 MIC5319-2.8BML 928 2.8 –40°C to +125°C 6-pin 2x2 MLF™ MIC5319BML 9AA ADJ –40°C to +125°C 6-pin 2x2 MLF™ MIC5319-2.8YD5 N928 2.8 –40°C to +125°C Thin SOT23-5 Pb-Free Part Number Package MIC5319-2.8YML 928 2.8 –40°C to +125°C 6-pin 2x2 MLF™ Pb-Free MIC5319YML 9AA ADJ –40°C to +125°C 6-pin 2x2 MLF™ Pb-Free Note: 1. For other output voltage options, contact Micrel marketing. 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 (Adjustable) 6-Pin 2mm x 2mm MLF™ (ML) (Top View) MIC5319-x.xBML 6-Pin 2mm x 2mm MLF™ (ML) (Top View) EN GND VIN 3 2 1 KWxx 4 5 BYP VOUT MIC5319-x.xBD5 TSOT-23-5 (D5) (Top View) Pin Description Pin Number MLF-6 Fixed Pin Number MLF-6 Adj. 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 0.1µF to GND for reduced output noise. May be left open. HS Pad HS Pad – EPAD October 2004 Pin Number Pin Name TSOT-23-5 Fixed Pin Function Enable Input. Active High. High = on, low = off. Do not leave floating. Output voltage. Exposed Heatsink Pad connected to ground internally. 2 M9999-100604 MIC5319 Micrel 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, 5 sec.) ....................... 260°C ESD(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(5) VIN = VOUT +1.0V; COUT = 2.2µF, IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to + 125°C; unless noted. Parameter Condition Min Output Voltage Accuracy Variation from nominal VOUT Variation from nominal VOUT, IOUT = 100µA to 500mA Typ Max Units –1.0 +1.0 % –2.0 +2.0 % Feedback Voltage 1.2375 1.25 1.2625 V (ADJ option) 1.225 1.25 1.275 V VIN = VOUT +1V to 5.5V 0.04 0.3 %/V IOUT = 100µA to 500mA 0.1 0.5 % IOUT = 50mA 20 40 mV IOUT = 500mA 200 400 mV IOUT = 0 to 500mA 90 150 µA Ground Pin Current in Shutdown VEN ≤ 0.2V 0.5 µA Ripple Rejection f = up to 1kHz; COUT = 2.2µF ceramic; CBYP = 0.1µF 70 dB f = 10kHz; COUT = 2.2µF ceramic; CBYP = 0.1µF 60 dB 700 mA µVrms Line Regulation Load Regulation(6) Dropout Voltage(7)(8) Ground Pin Current(9) Current Limit VOUT = 0V 600 Output Voltage Noise COUT =2.2µF, CBYP = 0.1µF, 10Hz to 100kHz 40 Turn-On Time COUT = 2.2µF; CBYP = 0.01µF 40 100 µs 0.2 V Enable Input Enable Input Voltage Logic Low (Regulator Shutdown) Logic High (Regulator Enabled) Enable Input Current 1.0 V VIL ≤ 0.2V (Regulator Shutdown) 0.01 1 µA VIH ≥ 1.0V (Regulator Enabled) 0.01 1 µA 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) / 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. October 2004 3 M9999-100604 MIC5319 Micrel Typical Characteristics 40 30 20 10 0 10 1k 100 10k 100k FREQUENCY (Hz) 0 10 1M Ground Current 90 60 50 40 30 Iload = 50mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2 uF 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 30 20 10 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 90 GROUND CURRENT (µA) Iload = 500mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2 uF Ground Current 70 60 50 40 30 10 0 3 October 2004 Iload = 500mA Vout = 2.8V Cout = 2.2uF 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5 Ground Current 50 40 30 Iload = 150mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2 uF 20 10 70 60 50 40 Iload = 50mA Vout = 2.8V Cout = 2.2 uF 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5 Dropout Characteristics 2.5 2 150mA 1.5 1 50mA 500mA 0.5 0 0 1 2 3 4 INPUT VOLTAGE (V) 4 65 60 5 Vout = 2.8V Vin = Vout + 1V Cout = 2.2uF Cbyp = 0.01uF 1 10 100 1000 OUTPUT CURRENT (mA) Ground Current 80 70 60 50 40 30 20 10 100 90 80 10 0 3 70 Iload = 300mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2 uF 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) Ground Current 30 20 75 90 60 Ground Current 80 55 0.1 1M 70 3 80 20 GROUND CURRENT (µA) 50 40 OUTPUT VOLTAGE (V) GROUND CURRENT (µA) 70 60 1k 100 10k 100k FREQUENCY (Hz) 80 100 90 80 Vout = 2.8V Vin = Vout + 1V Cout = 2.2uF 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) Ground Current 100 50mA 20 10 70 10 500mA 40 30 Vout = 2.8V Vin = Vout + 1V Cout = 2.2uF 80 20 60 50 GROUND CURRENT (µA) GROUND CURRENT (µA) 90 500mA 100µA GROUND CURRENT (µA) 60 50 GROUND CURRENT (µA) 100µA 85 Ground Current 90 80 70 60 50 40 30 20 10 0 3 30 DROPOUT VOLTAGE (mV) 50mA 90 80 70 PSRR (dB) PSRR (dB) 90 80 70 PSRR (Bypass Pin Cap = 0.01µF) 100 GROUND CURRENT (µA) PSRR (Bypass Pin Cap = 0.1µF) 100 Iload = 150mA Vout = 2.8V Cout = 2.2 uF 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5 Dropout Voltage 25 20 15 10 5 Iload = 50mA Vout = 2.8V Cout = 2.2uF 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) M9999-100604 MIC5319 Micrel DROPOUT VOLTAGE (mV) 70 60 50 40 30 20 Iload = 150mA Vout = 2.8V Cout = 2.2uF 10 600 500 400 300 100 Iload = 100uA Vout = 2.8V Vin = Vout + 1V Cout = 2.2uF 3 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) 150 100 50 3 OUTPUT VOLTAGE (V) SHORT CIRCUIT CURRENT (mA) Short Circuit Current 200 200 6 Iload = 500mA Vout = 2.8V Cout = 2.2uF Output Voltage vs. Temperature 2.95 2.9 2.85 2.8 2.75 2.7 Iload = 100uA Vout = 2.8V Vin = Vout + 1V 2.65 2.6 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) Dropout Voltage 200 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 700 Dropout Voltage 180 160 140 120 100 80 60 40 20 Vout = 2.8V Cout = 2.2uF 0 0 100 200 300 400 500 OUTPUT CURRENT (mA) ENABLE THRESHOLD VOLTAGE (V) DROPOUT VOLTAGE (mV) 250 DROPOUT VOLTAGE (mV) Dropout Voltage 80 1.6 Enable Threshold vs. Temperature 1.4 1.2 1 0.8 0.6 0.4 0.2 Iload = 100uA Vout = 2.8V Vin = Vout + 1V Cout = 2.2uF 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) Output Noise Spectral Density NOISE (µV/ √ Hz) 10 1 0.1 Iload = 50Ω Vout = 2.8V 0.01 Vin = 4.45V Cout = 2.2uF Cbyp = 0.01uF 0.001 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) October 2004 5 M9999-100604 MIC5319 Micrel Functional Characteristics Line Transient Response Output Voltage (10mV/div) Load Transient Response Input Voltage (2V/div) 5V 4V CBYP = 0.01µF VIN = 3.8V COUT = 2.2µF Output Current (200mA/div) Output Voltage (100mV/div) 500mA CBYP = 0.01µF IOUT = 100µA COUT = 2.2µF 100mA TIME (4µs/div) TIME (200µs/div) Shutdown Delay VOUT = 3V CBYP = 0.01µF IOUT = 100µA COUT = 2.2µF TIME (20µs/div) October 2004 CBYP = 0.01µF RL = 6Ω COUT = 2.2µF VIN = 3.8V Output Voltage (1V/div) Output Voltage (1V/div) Enable Voltage (1V/div) Enable Voltage (1V/div) Enable Pin Delay TIME (20µs/div) 6 M9999-100604 MIC5319 Micrel 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 October 2004 7 M9999-100604 MIC5319 Micrel 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: 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-modecurrent 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 1µF capacitor is required from the inputto-ground 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 2.2µF or greater to maintain stability. The design is optimized for use with lowESR 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. X7Rtype 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 0.1µF 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. 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. October 2004 ⎛ R1⎞ VOUT = VREF ⎜1 + ⎟ ⎝ R2 ⎠ VREF = 1.25V VIN MIC5319BML VOUT VIN VOUT 1µF EN R1 BYP ADJ GND R2 2.2µF 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 × 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) × 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 ⎟ θ JA ⎝ ⎠ TJ(max) = 125°C, the maximum junction temperature of the die θJA thermal resistance = 93°C/W 8 M9999-100604 MIC5319 Micrel Table 1 shows junction-to-ambient thermal resistance for the MIC5319 in the 2mm x 2mm MLF package. Package θJA Recommended Minimum Footprint θJC 2 x 2 MLF™ 93°C/W 2°C/W SOT-23-5 235°C/W 0.25W = 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: 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. October 2004 125°C − TA 93°C/W 9 M9999-100604 MIC5319 Micrel Package Information TOP VIEW BOTTOM VIEW DIMENSIONS IN MILLIMETERS SIDE VIEW Rev. 02 6-Pin MLF™ (ML) 4AL TSOT-23-5 (D5) MICREL, INC. TEL 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 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. © 2004 Micrel, Incorporated. October 2004 10 M9999-100604