MIC5337 1.2mm x 1.6mm 300mA Low IQ LDO Ultra Low Dropout with Auto Discharge General Description Features The MIC5337 is a low quiescent current, low dropout regulator with an internal auto discharge feature designed for optimal performance in a small space. The MIC5337 is capable of sourcing 300mA of output current while only consuming 24µA of operating current. When the MIC5337 is disabled an internal resistive load is automatically applied to the output to discharge the output capacitor. This high performance LDO offers fast transient response as well as maintaining a high PSRR. The MIC5337 is an ideal solution for battery operated applications due to ultra low operating current and extremely low dropout voltage of 180mV at 300mA. Equipped with a TTL logic compatible enable pin, the MIC5337 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 MIC5337 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. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. • • • • • • • • • 300mA output current Low IQ: only 24µA operating current Low dropout voltage of 180mV @ 300mA Active discharge when enable pin is low Input voltage range: 2.3V to 5.5V 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 MIC5337-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 M9999-090908-A Micrel, Inc. MIC5337 Ordering Information Part Number Marking(1) Voltage(2) Temperature Range Package(3) MIC5337-2.8YMT 281 2.8V –40° to +125°C 4-Pin 1.2mm x 1.6mm Thin MLF® MIC5337-1.8YMT 181 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. HS Pad 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 M9999-090908-A Micrel, Inc. MIC5337 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, 5μsec.)....................... 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 = 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 60 mV Ground Pin Current (8) 0.05 Max 1 % IOUT = 150mA 90 150 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 65 dB f = 20kHz; COUT = 1µF; IOUT = 300mA 50 dB Current Limit VOUT = 0V Output Voltage Noise COUT = 1µF, 10Hz to 100kHz 400 600 90 Auto-Discharge NFET Resistance VEN=0V, VIN=3.6V 280 950 mA µVRMS 400 Ω 0.2 V Enable Voltage Enable Voltage Logic Low Logic High Enable Current Turn-on Time V 1.2 VIL ≤ 0.2V 0.01 1 VIH ≥ 1.2V 0.01 1 µA 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; 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. 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 M9999-090908-A Micrel, Inc. MIC5337 Typical Characteristics Power Supply Rejection Ratio 200 180 50mA 100mA 150mA 300mA 0 10 160 200 140 120 150 100 80 100 100 1k 10k 100k FREQUENCY (Hz) 1M Ground Current vs. Output Current 0 0 50 100 150 200 250 300 OUTPUT CURRENT (mA) Ground Current vs. Input Voltage 34 30 24 26 22 22 20 50 100 150 200 250 300 OUTPUT CURRENT (mA) Output Voltage vs. Input Voltage 300mA 50 VEN = VIN VOUT = 2.8V CIN = COUT = 1µF 14 10 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5 Output Voltage vs. Temperature 18 300mA 150mA 3.0 2.0 2.8 2.8 1.5 2.7 2.7 VEN = VIN = 3.8V ILOAD = 100µA CIN = COUT = 1µA 2.5 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 2.6 50mA 1.0 150mA Output Voltage vs. Output Current 300mA VEN = 1.2V VOUT = 2.8V CIN = COUT = 1µF 0.5 VIN = VEN = 3.8V VOUT = 2.8V CIN = COUT = 1µF 14 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 2.9 700 Ground Current vs. Temperature 100µA 22 150mA VEN = 1.2V VOUT = 2.8V CIN = COUT = 1µF 26 2.9 0 2.5 150mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 30 100µA 3.0 3.0 100µA 2.5 300mA 18 VIN = VEN = 3.8V VOUT = 2.8V CIN = COUT = 1µF 18 3.5 VEN = 1.2V VOUT = 2.8V CIN = COUT = 1µF 40 20 26 16 0 250 Dropout Voltage vs. Temperature 60 VEN = VIN = 2.8V VOUT = 1.8V COUT = 1µF 28 Dropout Voltage vs. Output Current 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5 Current Limit vs. Input Voltage 2.6 100 650 10 2.5 0 VIN = VEN = 3.8V CIN = COUT = 1µF 50 100 150 200 250 300 OUTPUT CURRENT (mA) Output Noise Spectral Density VIN = 4.5V VOUT = 2.8V COUT = 1µF 600 550 1 500 VEN = 1.2V VOUT = 2.8V CIN = COUT = 1µF 450 400 2.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) September 2008 5.5 0.1 0.01 10 100 1k 10k 100k FREQUENCY (Hz) 4 1M M9999-090908-A Micrel, Inc. MIC5337 Functional Characteristics September 2008 5 M9999-090908-A Micrel, Inc. MIC5337 Functional Characteristics (continued) September 2008 6 M9999-090908-A Micrel, Inc. MIC5337 Functional Diagram VIN VOUT LDO EN AutoDischarge REFERENCE GND 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. Applications Information The MIC5337 is a low quiescent current, low dropout regulator designed for optimal performance in a small space. The MIC5337 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. Minimum Load Current The MIC5337 does not require a minimum load to maintain output voltage regulation. Input Capacitor The MIC5337 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. Enable/Shutdown The MIC5337 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. When disabled, the MIC5337 switches a 280Ω load on the regulator output to discharge the external capacitor. The active high enable pin uses CMOS technology and cannot be left floating; a floating enable pin may cause an unknown output state. Output Capacitor The MIC5337 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 September 2008 Thermal Considerations The MIC5337 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 7 M9999-090908-A Micrel, Inc. MIC5337 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 MIC5337 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 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: 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. 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: ⎛ 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. September 2008 8 M9999-090908-A Micrel, Inc. MIC5337 U1 MIC5337-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 C1, C2 U1 Part Number C1608X5R0J105M MIC5337-xxYMT Manufacturer (1) TDK Micrel, Inc. (3) Description Qty. Capacitor, 1µF, 6.3, X5R, Size 0603 2 300mA low IQ LDO with Auto Discharge 1 Notes: 1. TDK: www.tdk.com 2. Vishay Dale: Vishay.com 3. Micrel, Inc.: www.micrel.com September 2008 9 M9999-090908-A Micrel, Inc. MIC5337 PCB Layout Recommendations Top Layer Bottom Layer September 2008 10 M9999-090908-A Micrel, Inc. MIC5337 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 11 M9999-090908-A