MIC5326 150mA Low Operating Current LDO General Description Features The MIC5326 is a low quiescent current, low dropout regulator designed for optimal performance in a small space. The MIC5326 is capable of sourcing 150mA 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 MIC5326 is an ideal solution for battery operated applications due to low operating current of 24μA and extremely low dropout voltage of 85mV at 150mA. Equipped with a TTL logic compatible enable pin, the MIC5326 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 MIC5326 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. MIC5326 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. • • • • • • • • 150mA output current Input voltage range: 2.3V to 5.5V Low 24µA operating current Low dropout voltage of 85mV @ 150mA Fixed output voltage Stable with 1μF ceramic capacitors Thermal shutdown and current limit protection Tiny 4-pin 1.2mm x 1.6mm Thin MLF® package Applications • • • • • • Mobile handsets GPS and navigation devices Portable media players Digital still and video cameras PDAs Portable electronics ___________________________________________________________________________________________________________ Typical Application MIC5326-xxYMT VIN VBAT 1µF VOUT VOUT 1µF VEN GND LDO Application MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 9440800 • fax + 1 (408) 4741000 • http://www.micrel.com October 2008 M9999-100808-A Micrel, Inc. MIC5326 Ordering Information Part Number Marking(2) Voltage(1) Temperature Range Package(3) MIC5326-2.8YMT 2Q8 2.8V –40° to +125°C 4-Pin 1.2mm x 1.6mm Thin MLF® Note: 1. For other voltage options contact Micrel Marketing. 2. Pin 1 identifier= “▲”. 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. October 2008 Enable Input: Active High Logic Input. Logic High = On; Logic Low = Off. Do not leave floating. 2 M9999-100808-A Micrel, Inc. MIC5326 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, 5sec.)........................ 260°C Junction Temperature(TJ ).........................–40°C to +125°C Storage Temperature (Ts) .........................–65°C to +150°C ESD Rating..................................................................... 2kV Supply Voltage (VIN)......................................... 2.3V to 5.5V Enable/Select 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 = 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) 0.05 Max Units +1.5 % +2.0 % 0.3 %/V 0.5 %/V Load Regulation IOUT = 100µA to 150mA Dropout Voltage(7) IOUT = 50mA 30 mV IOUT = 100mA 55 mV 1 % IOUT = 150mA 85 150 mV Ground Pin Current(8) IOUT = 100µA to 150mA 24 35 µA Ground Pin Current in Shutdown VEN = 0V 0.01 1 µA Ripple Rejection f = 1kHz; COUT = 1µF; IOUT = 150mA 60 dB f = 20kHz; COUT = 1µF; IOUT = 150mA 50 dB Current Limit VOUT = 0V Output Voltage Noise COUT = 1µF, 10Hz to 100kHz 275 475 750 90 mA µVRMS Enable Voltage Enable Voltage Logic Low 0.2 Logic High Enable Current Turn on Time V V 1.2 VIL ≤ 0.2V 0.01 1 µA VIH ≥ 1.2V 0.01 1 µA COUT = 1µF; IOUT = 150mA 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. October 2008 3 M9999-100808-A Micrel, Inc. MIC5326 Typical Characteristics Power Supply Rejection Ratio 3.00 50mA 100mA 150mA VIN = VOUT +1V 0 VOUT = 2.8V COUT = 1µF 10 10 100 1k 10k 100k FREQUENCY (Hz) 2.95 2.90 2.90 2.85 2.85 2.80 2.80 2.75 2.75 2.70 VIN = VEN = VOUT +1 VOUT = 2.8V CIN = COUT = 1µF 2.65 1M Output Voltage vs. Input Voltage 2.60 0 25 50 75 100 125 150 OUTPUT CURRENT (mA) Ground Current vs. Output Current 32 24 50mA 2.5 120 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5 Dropout Voltage vs. Temperature 2.60 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) Dropout Voltage vs. Output Current 60 50 100µA 2.0 2.5 VIN = VEN = VOUT +1V CIN = COUT = 1µF 2.65 90 80 70 28 VEN = 1.2V VOUT = 2.8V CIN = COUT = 1µF 2.70 100 3.0 150mA Output Voltage vs. Temperature 3.00 2.95 100µA 3.5 Output Voltage vs. Output Current 20 VIN = VEN = VOUT + 1 VOUT = 2.8V CIN = COUT = 1µF 16 0 25 50 75 100 125 150 OUTPUT CURRENT (mA) Ground Current vs. Temperature 32 40 30 20 10 0 0 34 100 VEN = VIN CIN = COUT = 1µF 25 50 75 100 125 150 OUTPUT CURRENT (mA) Ground Current vs. Input Voltage 30 150mA 28 80 26 60 100µA 24 40 VEN = 1.2V VOUT = 2.8V CIN = COUT = 1µF ILOAD = 150mA 20 22 100µA 150mA VIN = VEN = VOUT + 1V VOUT = 2.8V CIN = COUT = 1µF 20 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 16 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) Current Limit vs. Input Voltage Output Noise Spectral Density 700 VEN = 1.2V VOUT = 2.8V CIN = COUT = 1µF 650 100 10 18 VIN = VEN VOUT = 2.8V CIN = COUT = 1µF 14 10 2.5 3 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5 VIN = 4.5V VOUT = 2.8V COUT = 1µF 600 550 1 500 0.1 450 400 2.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) October 2008 5.5 0.01 100 1k 10k 100k FREQUENCY (Hz) 4 1M M9999-100808-A Micrel, Inc. MIC5326 Functional Characteristics October 2008 5 M9999-100808-A Micrel, Inc. MIC5326 Functional Diagram VIN VOUT LDO EN REFERENCE GND MIC5326 Block Diagram October 2008 6 M9999-100808-A Micrel, Inc. MIC5326 Thermal Considerations The MIC5326 is designed to provide 150mA 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 150mA. The power dissipation of the regulator circuit can be determined using the equation: Applications Information The MIC5326 is a low quiescent current, low dropout regulator designed for optimal performance in a small space. The MIC5326 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 – VOUT) 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 MIC5326 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) × 150mA PD = 0.12W To determine the maximum ambient operating temperature use the junction to ambient thermal resistance of the device and the following basic equation: ⎛ TJ(max) − TA PD(max) = ⎜⎜ θ JA ⎝ Output Capacitor The MIC5326 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. 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 MIC5326 at an input voltage of 3.6V and 150mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.12W = (125°C – TA)/(173°C/W) TA = 104.24°C Therefore a 2.8V 150mA application can accept an ambient operating temperature of 104.24°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 MIC5326 does not require a minimum load to maintain output voltage regulation. Enable/ Shutdown The MIC5326 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 uses CMOS technology and cannot be left floating; a floating enable pin may cause an unknown output state. October 2008 ⎞ ⎟ ⎟ ⎠ 7 M9999-100808-A Micrel, Inc. MIC5326 U1 MIC5326-xxYMT J1 VIN 1 VIN VOUT J3 VOUT 4 C1 1µF J5 EN 3 EN GND C2 1µF 2 J4 GND J2 GND Bill of Materials Item Part Number Manufacturer Description Qty. C1, C2 C1608X5R0J105K TDK(1) Capacitor, 1µF, 10V, X5R, Size 0603 2 150mA Low Operating Current LDO 1 U1 MIC5326-xxYMT Micrel, Inc. (2) Notes: 1. TDK: www.tdk.com 2. Micrel, Inc.: www.micrel.com October 2008 8 M9999-100808-A Micrel, Inc. MIC5326 PCB Layout Recommendations Top Layer Bottom Layer October 2008 9 M9999-100808-A Micrel, Inc. MIC5326 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) 9440800 FAX +1 (408) 4741000 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. October 2008 10 M9999-100808-A