MIC5305 150mA µCap Ultra-Low Dropout LDO Regulator General Description Features The MIC5305 is a high-performance, 150mA LDO regulator, offering extremely high PSRR and very low noise while consuming low ground current. Ideal for battery-operated applications, the MIC5305 features 1% accuracy, extremely low-dropout voltage (60mV @ 150mA), and low ground current at light load (typically 90µA). Equipped with a logic-compatible enable pin, the MIC5305 can be put into a zero-off-mode current state, drawing no current when disabled. The MIC5305 is a µCap design operating with very small ceramic output capacitors for stability, thereby reducing required board space and component cost. The MIC5305 is available in fixed output voltages and adjustable output voltages in the super-compact 6-pin 2mm × 2mm MLF® leadless package, our new ultra-thin 6-pin 2mm × 2mm Thin MLF® and thin SOT-23-5 package. Additional voltage options are available. Contact Micrel marketing. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. • • • • • • • • • • • • • • Ultra-low dropout voltage of 60mV @ 150mA Input voltage range: 2.25 to 5.5V Stable with ceramic output capacitor 150mA guaranteed output current Low output noise — 20µVrms Low quiescent current of 90µA total High PSRR, up to 85dB @1kHz Less than 30µs turn-on time w/CBYP = 0.01µF High output accuracy: – ±1.0% initial accuracy – ±2.0% over temperature Thermal shutdown protection Current limit protection Tiny 6-pin 2mm × 2mm MLF® package Ultra-Thin 6-pin 2mm × 2mm Thin MLF® package Thin SOT-23-5 package Applications • • • • • • Cellular phones PDAs Fiber optic modules Portable electronics Notebook PCs Audio Codec power supplies Typical Application Dropout Voltage MIC5305 3.0V VIN 2.85V@150mA VOUT VIN VOUT 1µF EN BYP 0.1µF DROPOUT VOLTAGE (mV) 70 60 50 40 30 20 10 0 0 20 40 60 80 100 120 140 OUTPUT CURRENT (mA) 1µF GND 100 90 PSRR (Bypass Pin Cap = 0.1µF) 150mA PSRR (dB) 80 70 60 50 40 50mA 100µA 30 20 10 0 0.1 1 10 100 FREQUENCY (kHz) 1k 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 June 2007 1 M9999-062507 Micrel, Inc. MIC5305 Ordering Information Part Number Marking Voltage Junction Temp. Range(1) Package 815 1.5V –40°C to +125°C 6-Pin 2x2 MLF ® 818 1.8V –40°C to +125°C 6-Pin 2x2 MLF ® 820 2.0V –40°C to +125°C 6-Pin 2x2 MLF ® Standard Pb-Free Standard Pb-Free* MIC5305-1.5BML MIC5305-1.5YML 815 MIC5305-1.8BML MIC5305-1.8YML 818 MIC5305-2.0YML MIC5305-2.5BML MIC5305-2.5YML 825 825 2.5V –40°C to +125°C 6-Pin 2x2 MLF ® MIC5305-2.6BML MIC5305-2.6YML 826 826 2.6V –40°C to +125°C 6-Pin 2x2 MLF ® MIC5305-2.7BML MIC5305-2.7YML 827 827 2.7V –40°C to +125°C 6-Pin 2x2 MLF ® MIC5305-2.8BML MIC5305-2.8YML 828 828 2.8V –40°C to +125°C 6-Pin 2x2 MLF ® MIC5305-2.85BML MIC5305-2.85YML 82J 82J 2.85V –40°C to +125°C 6-Pin 2x2 MLF ® MIC5305-2.9BML MIC5305-2.9YML 829 829 2.9V –40°C to +125°C 6-Pin 2x2 MLF ® MIC5305-3.0BML MIC5305-3.0YML 830 830 3.0V –40°C to +125°C 6-Pin 2x2 MLF ® MIC5305-3.3BML MIC5305-3.3YML 833 833 3.3V –40°C to +125°C 6-Pin 2x2 MLF ® MIC5305-4.75BML MIC5305-4.75YML 84H 84H 4.75V –40°C to +125°C 6-Pin 2x2 MLF ® MIC5305BML MIC5305YML 8AA 8AA ADJ –40°C to +125°C 6-Pin 2x2 MLF ® MIC5305-2.8YMT 828** 2.8V –40°C to +125°C 6-Pin 2x2 Thin MLF ® MIC5305-4.6YMT 846** 4.6V –40°C to +125°C 6-Pin 2x2 Thin MLF ® MIC5305-1.5BD5 MIC5305-1.5YD5 N815 N815 1.5V –40°C to +125°C Thin SOT23-5 MIC5305-1.8BD5 MIC5305-1.8YD5 N818 N818 1.8V –40°C to +125°C Thin SOT23-5 MIC5305-2.5BD5 MIC5305-2.5YD5 N825 N825 2.5V –40°C to +125°C Thin SOT23-5 MIC5305-2.6BD5 MIC5305-2.6YD5 N826 N826 2.6V –40°C to +125°C Thin SOT23-5 MIC5305-2.7BD5 MIC5305-2.7YD5 N827 N827 2.7V –40°C to +125°C Thin SOT23-5 MIC5305-2.8BD5 MIC5305-2.8YD5 N828 N828 2.8V –40°C to +125°C Thin SOT23-5 MIC5305-2.85BD5 MIC5305-2.85YD5 N82J N82J 2.85V –40°C to +125°C Thin SOT23-5 MIC5305-2.9BD5 MIC5305-2.9YD5 N829 N829 2.9V –40°C to +125°C Thin SOT23-5 MIC5305-3.0BD5 MIC5305-3.0YD5 N830 N830 3.0V –40°C to +125°C Thin SOT23-5 MIC5305-3.3BD5 MIC5305-3.3YD5 N833 N833 3.3V –40°C to +125°C Thin SOT23-5 MIC5305-4.75BD5 MIC5305-4.75YD5 N84H N84H 4.75V –40°C to +125°C Thin SOT23-5 Note: 1. For other output voltage options, contact Micrel marketing. * Underbar/Overbar symbols may not be to scale. ® ** Pin 1 identifier for 2x2 Thin MLF is “▲” symbol. June 2007 2 M9999-062507 Micrel, Inc. MIC5305 Pin Configuration EN 1 GND 2 VIN 3 6 BYP 5 NC GND 2 VIN 3 6 BYP GND 2 5 ADJ 4 VOUT 4 VOUT VIN 3 MIC5305-x.xBML/YML (Fixed) 6-Pin 2mm x 2mm MLF® (ML) (Top View) EN 1 EN 1 MIC5305-x.xBML/YML (Adjustable) 6-Pin 2mm x 2mm MLF® (ML) (Top View) EN GND VIN 6 BYP 3 2 1 KWxx 5 NC 4 VOUT 4 BYP 5 VOUT MIC5305-x.xBD5/YD5 (Fixed) TSOT-23-5 (D5) (Top View) MIC5305-x.xYMT (Fixed) ® 6-Pin 2mm x 2mm Thin MLF (MT) (Top View) Pin Description Pin Number MLF-6 Fixed Pin Number MLF-6 Adjustable Pin Number Thin MLF-6 Fixed Pin Number TSOT23-5 Fixed Pin Name 1 1 1 3 EN 2 2 2 2 GND Ground. 3 3 3 1 VIN Supply Input. 4 4 4 5 VOUT – 5 – 5 – 5 – NC No connection for fixed voltage parts. 6 6 6 4 BYP Reference Bypass: Connect external 0.1µF to GND for reduced output noise. May be left open. HS Pad HS Pad HS Pad – EPAD June 2007 ADJ 3 Pin Name Enable Input. Active High. High = on, low = off. Do not leave floating. Output Voltage. Adjust Input: Connect to external resistor voltage divider network. Exposed Heatsink Pad connected to ground internally. M9999-062507 Micrel, Inc. MIC5305 Absolute Maximum Ratings(1) Operating Ratings(2) Supply 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 Lead Temperature (soldering, 5sec.)......................... 260°C Storage Temperature (Ts) .........................–65°C to +150°C EDS Rating(4) .................................................................. 2kV Supply voltage (VIN) ....................................... 2.25V to 5.5V Enable Input Voltage (VEN)..................................... 0V to VIN Junction Temperature (TJ) ........................ –40°C to +125°C Junction Thermal Resistance MLF-6 (θJA) ........................................................93°C/W Thin MLF-6 (θJA) ................................................93°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 Condition Output Voltage Accuracy Min Max Units Variation from nominal VOUT –1.0 +1.0 % Variation from nominal VOUT, IOUT = 100mA to 150mA –2.0 +2.0 % Output Voltage Temp. Coefficient Line Regulation Typ 40 pm/°C VIN = VOUT +1V to 5.5V 0.02 0.3 %/V (6) IOUT = 100µA to 150mA 0.1 0.5 % (7) IOUT = 50mA, VOUT > 2.8V 20 35 mV IOUT = 150mA, VOUT > 2.8V 60 85 mV IOUT = 50mA, VOUT > 2.8V 27 45 mV IOUT = 150mA, VOUT > 2.8V 85 110 mV 150 µA Load Regulation Dropout Voltage Ground Pin Current (8) IOUT = 0 to 150mA 90 Ground Pin Current in Shutdown VEN ≤ 0.2V 0.5 µA Ripple Rejection f = up to 1kHz; COUT = 1.0µF ceramic; CBYP = 0.1µF 85 dB f = 10kHz; COUT = 1.0µF ceramic; CBYP = 0.1µF 65 Current Limit VOUT = 0V Output Voltage Noise COUT =1µF, CBYP = 0.1µF, 10Hz to 100kHz 20 Turn-On Time COUT = 1µF; CBYP= 0.1µF; IOUT= 150mA 30 300 600 dB 900 mA µVrms 100 µs 0.2 V Enable Input Enable Input Voltage Logic Low (Regulator Shutdown) Logic High (Regulator Enabled) Enable Input Current V 1.0 VIL ≤ 0.2V (Regulator Shutdown) 0.01 1 µA VIH ≥ 1.0V (Regulator Enabled) 0.01 1 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 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 VOUT. For outputs below 2.25V, dropout voltage is the input-to-output differential with the minimum input voltage 2.25V. 8. 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. June 2007 4 M9999-062507 Micrel, Inc. MIC5305 Typical Characteristics PSRR (Bypass Pin Cap = 0.01µF) 50mA 100µA 70 60 60 40 50 40 1k 75 VIN = VOUT +1V 1 10 100 1000 OUTPUT CURRENT (mA) Ground Pin Current GROUND CURRENT (µA) 50 40 30 20 2 ILOAD = 100µA 1 2 3 4 5 INPUT VOLTAGE (V) Dropout Voltage 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 I = 1mA 0.2 OUT 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE(°C) June 2007 80 70 60 50 40 30 20 10 0 100 ILOAD = 150mA 1 2 3 4 5 INPUT VOLTAGE (V) Dropout Voltage 70 60 50 40 30 20 10 IOUT = 50mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 5 1k Dropout Characteristics I 3 LOAD = 100µA 2.5 2 I = 150mA LOAD 1.5 1 0.5 0 6 90 80 1 10 100 FREQUENCY (kHz) 94 92 90 88 86 84 82 80 78 76 74 I = 150mA 72 LOAD 70 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 3.5 90 0 6 DROPOUT VOLTAGE (mV) 10 0 0 Ground Pin Current 100 50mA Ground Pin Current OUTPUT VOLTAGE (V) 80 100 90 80 70 60 10 0 0.1 1k 94 92 90 88 86 84 82 80 78 76 74 ILOAD = 100µA 72 70 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 100µA 40 30 20 GROUND CURRENT (µA) GROUND CURRENT (µA) 85 70 0.1 1 10 100 FREQUENCY (kHz) 150mA 70 60 50 Ground Pin Current 90 GROUND CURRENT (µA) 100µA DROPOUT VOLTAGE (mV) 1 10 100 FREQUENCY (kHz) 0 0.1 Ground Pin Current GROUND CURRENT (µA) 50mA 20 10 0 0.1 DROPOUT VOLTAGE (mV) 90 80 30 20 PSRR (Bypass Pin Cap = 1µF) 100 150mA 80 150mA 80 PSRR (Bypass Pin Cap = 0.1µF) PSRR (dB) 100 PSRR (dB) 100 90 PSRR (dB) 120 0 100 90 80 1 2 3 4 5 INPUT VOLTAGE (V) 6 Dropout Voltage 70 60 50 40 30 20 10 I = 100mA OUT 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) M9999-062507 Micrel, Inc. 70 60 50 40 30 20 10 IOUT = 150mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 2.92 Output Voltage vs. Temperature 2.91 VOUT (V) 2.9 2.89 2.88 2.87 2.86 ILOAD = 100µA VOUT = 2.9V 2.85 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) June 2007 DROPOUT VOLTAGE (mV) 90 80 70 Dropout Voltage 60 50 40 30 20 10 0 1 0 20 40 60 80 100 120 140 OUTPUT CURRENT (mA) Enable Threshold vs. Temperature SHORT CIRCUIT CURRENT (mA) Dropout Voltage ENABLE THRESHOLD VOLTAGE (V) DROPOUT VOLTAGE (mV) 100 MIC5305 Short Circuit Current 800 700 600 500 400 300 200 100 0 3 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) 6 Output Noise Spectral Density 0.9 0.8 0.7 0.6 0.5 0.4 I = 100µA LOAD 0.3 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 6 M9999-062507 Micrel, Inc. MIC5305 Functional Characteristics Load Transient Response OutputVoltage (50mV/div) Line Transient Response 3V CBYP = 0.01µF IOUT = 100µA COUT = 1µF Ceramic TIME (400µs/div) TIME (4µs/div) Enable Pin Delay EnableVoltage (1V/div) OutputVoltage (1V/div) OutputVoltage (1V/div) EnableVoltage (1V/div) Shutdown Delay CBYP = 0.01µF IOUT = 100µA CIN = 1µF Ceramic COUT = 1µF Ceramic TIME (10µs/div) June 2007 CBYP = 0.01µF VIN = 4V COUT = 1µF Ceramic Output Current (100mA/div) OutputVoltage (1V/div) Input Voltage (1V/div) 5V CBYP = 0.01µF IOUT = 100µA VIN = 4V CIN = 1µF Ceramic COUT = 1µF Ceramic TIME (20µs/div) 7 M9999-062507 Micrel, Inc. MIC5305 Functional Diagram VIN VOUT EN VREF QuickStart Error LDO Amp BYP Thermal Shutdown Current Limit GND MIC5305 Block Diagram – Fixed VIN VOUT EN QuickStart VREF Error LDO Amp BYP Thermal Shutdown Current Limit GND MIC5305 Block Diagram – Adjustable June 2007 8 M9999-062507 Micrel, Inc. MIC5305 No-Load Stability Unlike many other voltage regulators, the MIC5305 will remain stable and in regulation with no load. This is especially import in CMOS RAM keep-alive applications. Application Information Enable/Shutdown The MIC5305 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. Adjustable Regulator Application Adjustable regulators use the ratio of two resistors to multiply the reference voltage to produce the desired output voltage. The MIC5305 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: R1 ⎞ ⎛ VOUT = VREF ⎜1 + ⎟ R2 ⎝ ⎠ Input Capacitor The MIC5305 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 high frequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out high-frequency noise and are good practice in any RF-based circuit. VREF = 1.25V MIC5305BML VIN R1 1µF Output Capacitor The MIC5305 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. EN ADJ GND 1µF R2 Figure 1. Adjustable Voltage Application Thermal Considerations The MIC5305 is designed to provide 150mA of continuous current in a very small package. 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 5.0V, the output voltage is 2.9V and the output current = 150mA. 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 = (5.0V – 2.9V) × 150mA PD = 0.32W 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: 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 bypass capacitance. A unique, quick-start circuit allows the MIC5305 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. June 2007 VOUT VIN VOUT ⎛ TJ(max) − TA PD(max) = ⎜⎜ θ JA ⎝ ⎞ ⎟ ⎟ ⎠ TJ(max) = 125°C, the max. junction temperature of the die. θJA thermal resistance = 93°C/W 9 M9999-062507 Micrel, Inc. MIC5305 Table 1 shows junction-to-ambient thermal resistance for the MIC5305 in the 6-pin 2mm × 2mm MLF® package. Package 6-Pin 2x2 MLF ® θJA Recommended Minimum Footprint θJC 93°C/W 2°C/W minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.32W = TA = 95.2°C Therefore, a 2.9V application at 150mA of output current can accept an ambient operating temperature of 95.2°C in a 6-pin 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 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 (the minimum amount of copper that you can solder the part to) is 93°C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5305-2.9BML at an input voltage of 5.0V and 150mA load with a June 2007 125°C − TA 93°C/W 10 M9999-062507 Micrel, Inc. MIC5305 Package Information ® 6-Pin 2x2 MLF (ML) ® 6-Pin 2x2 Thin MLF (MT) June 2007 11 M9999-062507 Micrel, Inc. MIC5305 5-Pin TSOT-23 (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. © 2004 Micrel, Incorporated. June 2007 12 M9999-062507