MIC5327 300mA Low Quiescent Current LDO General Description Features The MIC5327 is a low quiescent current, low dropout regulator designed for optimal performance in a small space. The MIC5327 is capable of sourcing 300mA of output current while only consuming 24µA of operating current. This high performance LDO offers Low dropout, fast transient response, good PSRR, and low output voltage noise. The MIC5327 is an ideal solution for battery operated applications due to ultra low quiescent current and extremely low dropout voltage of 180mV at 300mA. Equipped with a TTL logic compatible enable pin, the MIC5327 can be put into a zero-off-mode current state, drawing virtually no current when disabled. Board space and component cost is minimized because the MIC5327 operates with very small 1μF ceramic capacitors, provides fixed output voltages, and is available in the tiny 1.2mm x 1.6mm Thin MLF® package. MIC5327 also features thermal shutdown and current limit protection. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. • • • • • • • • 300mA output current Input voltage range: 2.3V to 5.5V Low 24µA operating current Low dropout voltage of 180mV @ 300mA Fixed output voltages Stable with 1μF ceramic capacitors Thermal shutdown and current limit protection Tiny 4-pin 1.2mm x 1.6mm Thin MLF® package Applications • • • • • • Mobile Phones GPS and Navigation Devices Portable Media Players Digital still and video cameras PDAs Portable Electronics ___________________________________________________________________________________________________________ Typical Application MIC5327-xxYMT VIN VBAT 1µF VOUT VOUT 1µF VEN GND 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 September 2008 M9999-093008-A Micrel, Inc. MIC5327 Ordering Information Part Number Marking(1) Voltage(2) Temperature Range Package(3) MIC5327-2.8YMT 2O8 2.8V –40° to +125°C 4-Pin 1.2mm x 1.6mm Thin MLF® MIC5327-1.8YMT 1Q8 1.8V –40° to +125°C 4-Pin 1.2mm x 1.6mm Thin MLF® Note: 1. Pin 1 identifier = “▲”. 2. For other voltage options contact Micrel Marketing. 3. MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu, Mold compound is Halogen Free. Pin Configuration VIN 1 4 VOUT GND 2 3 EN 4-Pin 1.2mm x 1.6mm Thin MLF® (MT) Pin Description Pin Number Pin Name Pin Function 1 VIN Supply Input. 2 GND Ground. 3 EN 4 VOUT Output Voltage. HSPAD EPAD Exposed heatsink pad connected to ground internally. September 2008 Enable Input: Active High Input. Logic High = On; Logic Low = Off. Do not leave floating. 2 M9999-093008-A Micrel, Inc. MIC5327 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) ........................................ –0.3V to +6V Enable Voltage (VEN)......................................... –0.3V to VIN Power Dissipation (PD) ........................... Internally Limited(3) Lead Temperature (soldering, 5 sec.)........................ 260°C Junction Temperature (TJ ).........................-40°C to +125°C Storage Temperature (TS)..........................-65°C to +150°C ESD Rating(4) .................................................................. 2kV Supply Voltage (VIN)....................................... +2.3V to 5.5V Enable Voltage (VEN).............................................. 0V to VIN Junction Temperature (TJ) ........................ –40°C to +125°C Junction Thermal Resistance 1.2mm x 1.6mm Thin MLF-4 (θJA) ............................173°C/W Electrical Characteristics(5) VIN = VEN = VOUT + 1V; COUT = CIN = 1µF; 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 –1.5 Variation from nominal VOUT –2.0 Line Regulation VIN = VOUT +1V to 5.5V, IOUT = 100µA Typ 0.01 VIN = VOUT +1V to 5.5V, IOUT = 100µA (6) Units +1.5 % +2.0 % 0.3 %/V 0.5 %/V Load Regulation IOUT = 100µA to 300mA Dropout Voltage(7) IOUT = 50mA 30 mV IOUT = 100mA 55 mV Ground Pin Current (8) 0.05 Max 1 % IOUT = 150mA 85 150 mV IOUT = 300mA 180 300 mV IOUT = 100µA to 300mA 24 35 µA 0.01 1 µA Ground Pin Current in Shutdown VEN = 0V Ripple Rejection f = 1kHz; COUT = 1µF; IOUT = 300mA 60 dB f = 20kHz; COUT = 1µF; IOUT = 300mA 50 dB Current Limit VOUT = 0V Output Voltage Noise COUT = 1µF, 10Hz to 100kHz 400 600 950 90 mA µVRMS Enable Voltage Enable Voltage Logic Low Logic High Enable Current Turn-on Time 0.2 V V 1.2 VIL ≤ 0.2V 0.01 1 µA VIH ≥ 1.2V 0.01 1 µA COUT = 1µF; IOUT = 300mA 150 500 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. 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. 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. September 2008 3 M9999-093008-A Micrel, Inc. MIC5327 Typical Characteristics Power Supply Rejection Ratio 32 50mA 100mA 100µA 150mA 300mA 0 10 32 28 28 24 24 20 20 Ground Current vs. Input Voltage 100µA 300mA 150mA VEN = 1.2V VOUT = 2.8V COUT = 1µF 32 Ground Current vs. Output Current 100 1k 10k 100k FREQUENCY (Hz) 1M Ground Current vs. Temperature VIN = VEN = 3.8V VOUT = 2.8V CIN = COUT = 1µF 16 0 50 100 150 200 250 300 OUTPUT CURRENT (mA) Output Voltage vs. Input Voltage 3.5 16 3.0 2.90 28 VIN = VEN = 3.8V VOUT = 2.8V CIN = COUT = 1µF 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5 Output Voltage vs. Temperature 2.85 3.0 100µA 100µA 24 300mA 20 2.80 VIN = VEN = 3.8V VOUT = 2.8V CIN = COUT = 1µF 16 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 1.810 150mA 2.5 150mA Output Voltage vs. Output Current 50mA 300mA 2.0 2.5 250 1.805 VEN = VIN VOUT = 2.8V CIN = COUT = 1µF 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5 Dropout Voltage vs. Temperature 1.790 0 700 VEN = VIN = 2.8V CIN = COUT = 1µF 50 100 150 200 250 300 OUTPUT CURRENT (mA) Current Limit vs. Input Voltage VOUT = 2.8V VEN = 1.2V CIN = COUT = 1µF 650 600 550 VEN = VIN = 3.8V CIN = COUT = 1µF 2.70 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 200 180 200 160 140 150 120 100 100 80 60 1.800 1.795 2.75 VOUT = 2.8V CIN = COUT = 1µF ILOAD = 300mA 50 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 100 40 20 0 0 Dropout Voltage vs. Output Current VEN = VIN CIN = COUT = 1µF 50 100 150 200 250 300 OUTPUT CURRENT (mA) Output Noise Spectral Density VIN = 4.5V VOUT = 2.8V COUT = 1µF 10 I LOAD 1 500 0.1 450 400 2.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) September 2008 5.5 0.01 10 100 1k 10k 100k FREQUENCY (Hz) 4 1M M9999-093008-A Micrel, Inc. MIC5327 Functional Characteristics September 2008 5 M9999-093008-A Micrel, Inc. MIC5327 Functional Diagram VIN VOUT LDO EN REFERENCE GND September 2008 6 M9999-093008-A Micrel, Inc. MIC5327 uses CMOS technology and cannot be left floating; a floating enable pin may cause an unknown output state. Thermal Considerations The MIC5327 is designed to provide 300mA continuous output current from a very small footprint package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. For example: given that the input voltage is 3.6V, the output voltage is 2.8V and the output current is 300mA. The power dissipation of the regulator circuit can be determined using the equation: Applications Information The MIC5327 is a low quiescent current, low dropout regulator designed for optimal performance in a small space. The MIC5327 regulator is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. Input Supply Voltage VIN provides the supply to power the LDO. The minimum input voltage is 2.3V allowing conversion from typical lithium ion batteries and low voltage supplies. PD = (VIN – VOUT1) I OUT + 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. Input Capacitor The MIC5327 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 with minimum space required. Additional high frequency capacitors, such as small value NPO dielectric type capacitors, help filter out high frequency noise and are good practice in any RF circuit. PD = (3.6V – 2.8V) × 300mA PD = 0.24W To determine the maximum ambient operating temperature use the junction to ambient thermal resistance of the device and the following basic equation: Output Capacitor The MIC5327 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. 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. 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. ⎛ TJ(max) − TA PD(max) = ⎜⎜ θ JA ⎝ The maximum junction temperature of the die, TJ(max) = 125°C.The package thermal resistance, θJA = 173°C/W. Substituting PD 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. For example, when operating the MIC5327 at an input voltage of 3.6V and 300mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.24W = (125°C – TA)/(173°C/W) TA = 83°C Therefore a 2.8V 300mA application can accept an ambient operating temperature of 83.0°C in a 1.2mm 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 Minimum Load Current The MIC5327 does not require a minimum load to maintain output voltage regulation. Enable/Shutdown The MIC5327 comes with an active high enable pin that enables the regulator. 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. The active high enable pin September 2008 ⎞ ⎟ ⎟ ⎠ 7 M9999-093008-A Micrel, Inc. MIC5327 U1 MIC5327-xxYMT J1 VIN J5 GND 1 VIN VOUT J3 VOUT 4 C1 1µF/6.3V 3 EN GND C2 1µF/6.3V 2 J4 GND J2 GND Bill of Materials Item Part Number Manufacturer Description Qty. C1, C2 C1608X5R0J105K TDK(1) Capacitor, 1µF, 6.3V, X5R, Size 0603 2 300mA Low operating current LDO 1 U1 MIC5327-xxYMT Micrel, Inc. (3) Notes: 1. TDK: www.tdk.com 2. Vishay Dale: Vishay.com 3. Micrel, Inc.: www.micrel.com September 2008 8 M9999-093008-A Micrel, Inc. MIC5327 PCB Layout Recommendations Top Layer Bottom Layer September 2008 9 M9999-093008-A Micrel, Inc. MIC5327 Package Information 4-Pin 1.2mm 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. © 2008 Micrel, Incorporated. September 2008 10 M9999-093008-A