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Technical content
Features
2.5V to 5.5V input voltage range 2% initial output accuracy Wide output voltage range: 1.0V to 3.3V Low quiescent current: 38µA per output Very low quiescent current in shutdown: <1 μA typical µCap stable with 2.2µF ceramic capacitor Low dropout voltage: 350mV at 500mA Excellent load/line transient response Independent logic controlled enable pins Output discharge circuit: MIC5356 Current and thermal limit protection Power 8-pin ePad MSOP package or 8-pin ePad 3mm x 3mm MLF® package
Applications
Smart phones GPS, PMP, DSC Notebooks and desktops Digital TV Portable electronics Typical Application
Micrel, Inc. MIC5355/6 March 2012 2 M9999-031512-A
Ordering Information
Part Number Part Number(1) Marking Code Voltage(2) Junction Temperature Range Package MIC5355-SGYMME MIC5355-3.3/1.8YMME 55SG 3.3V/1.8V –40° to +125°C 8-Pin ePad MSOP MIC5355-S4YMME MIC5355-3.3/1.2YMME 55S4 3.3V/1.2 V –40° to +125°C 8-Pin ePad MSOP MIC5355-SCYMME MIC5355-3.3/1.0YMME 55SC 3.3V/1.0 V –40° to +125°C 8-Pin ePad MSOP MIC5355-G4YMME MIC5355-1.8/1.2YMME 55G4 1.8V/1.2 V –40° to +125°C 8-Pin ePad MSOP MIC5355-JGYMME MIC5355-2.5/1.8YMME 55JG 2.5V1.8V –40° to +125°C 8-Pin ePad MSOP MIC5356-SGYMME MIC5356-3.3/1.8YMME 56SG 3.3V/1.8V –40° to +125°C 8-Pin ePad MSOP MIC5356-S4YMME MIC5356-3.3/1.2YMME 56S4 3.3V/1.2 V –40° to +125°C 8-Pin ePad MSOP MIC5356-SCYMME MIC5356-3.3/1.0YMME 56SC 3.3V/1.0 V –40° to +125°C 8-Pin ePad MSOP MIC5356-G4YMME MIC5356-1.8/1.2YMME 56G4 1.8V/1.2 V –40° to +125°C 8-Pin ePad MSOP MIC5356-JGYMME MIC5356-2.5/1.8YMME 56JG 2.5V/1.8 V –40° to +125°C 8-Pin ePad MSOP MIC5356-MMYML MI5356-2.8/2.8YML M3M 2.8V/2.8V –40° to +125°C 8-Pin ePad 3mm x 3mm MLF ® MIC5356-MGYML MI5356-2.8/1.8YML M3G 2.8V/1.8V –40° to +125°C 8-Pin ePad 3mm x 3mm MLF ® Notes: 1. MIC5356 offers Auto-Discharge function. 2. Other voltage available. Contact Micrel for detail. Pin Configuration 8-Pin ePad MSOP (MME) 8-Pin ePad 3mm x 3mm MLF® (ML) Pin Description Pin Number Pin Name Pin Function 1 VIN Supply Input. 2 GND Ground. 3 NC Not internally connected. 4 EN2 Enable Input LDO2. Active High Input. Logic High = On; Logic Low = Off; Do not leave floating. 5 EN1 Enable Input LDO1. Active High Input. Logic High = On; Logic Low = Off; Do not leave floating. 6 NC Not internally connected. 7 VOUT2 LDO2 Output. 8 VOUT1 LDO1 Output. ePad HSPAD Heatsink pad. Connect to ground.
Micrel, Inc. MIC5355/6 March 2012 3 M9999-031512-A Absolute Maximum Ratings(1) Operating Ratings(2) Junction Thermal Resistance Electrical Characteristics(5) VIN = VEN1 = VEN2 = VOUT +1V; higher of the two outputs; IOUTLDO1 = IOUTLDO2 = 100µA; COUT1 = COUT2= 2.2 µF; TJ = +25C, bold values indicate –40°C to +125°C, unless noted. Parameter Condition Min. Typ. Max. Units Variation from nominal VOUT 2.0 +2.0 Output Voltage Accuracy Variation from nominal VOUT 3.0 +3.0 Line Regulation V IN = VOUT + 1V to 5.5V, IOUT = 100µA 0.02 0.3 %/V Load Regulation I OUT = 100µA to 500mA 0.3 1 % IOUT = 50mA 40 100 Dropout Voltage IOUT = 500mA 350 800 mV VEN1 = High; VEN2 = Low; IOUT1 = 0mA 38 53 VEN1 = Low; VEN2 = High; IOUT2 = 0mA 38 53 VEN1 = VEN2 = High; IOUT1 = IOUT2 = 0mA 70 100 VEN1 = High; VEN2 = Low; IOUT1 = 500mA 55 90 VEN1 = Low; VEN2 = High; IOUT2 = 500mA 55 90 Ground Pin Current VEN1 = VEN2 = High; IOUT1 = IOUT2 = 500mA 105 200 µA Shutdown Current VEN1 = VEN2 0.2V 0.05 1 µA Ripple Rejection f = 1kHz; C OUT = 2.2µF; IOUT = 250mA 60 dB Current Limit V OUT = 0V 525 750 1050 mA Output Voltage Noise C OUT = 2.2µF, 10Hz to 100kHz 146 µV RMS Auto-Discharge NFET Resistance MIC5356 only; VEN1 = VEN2 = 0V; VIN = 3.6V; IOUT = 3mA 30 Ω 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 T A (ambient temperature) is PD(MAX) = (TJ(MAX) TA) / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature and the register will go into thermal shutdown. 5. Specification for packaged product only.
Micrel, Inc. MIC5355/6 March 2012 4 M9999-031512-A Electrical Characteristics(4) VIN = VEN1 = VEN2 = VOUT +1V; higher of the two outputs; IOUTLDO1 = IOUTLDO2 = 100µA; COUT1 = COUT2= 2.2 µF; TJ = +25C, bold values indicate –40°C to +125°C, unless noted. Parameter Condition Min. Typ. Max. Units Enable Inputs (EN1/EN2) Logic Low 0.2 Enable Input Voltage Logic High 1.2 V VIL 0.2V 0.01 1 Enable Input Current VIH 1.2V 0.01 1 µA Turn-On Time 50 125 µs Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 4. Specification for packaged product only.
Micrel, Inc. MIC5355/6 March 2012 5 M9999-031512-A Typical Characteristics Power Supply Rejection Ratio -80 -70 -60 -50 -40 -30 -20 -10 10 100 1000 10000 100000 FREQUENCY (Hz) dB VEN = VIN = 2.82V VOUT = 1.8V COUT = 2.2µF 500mA 100µA 250mA Output Voltage vs. Input Voltage 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.5 3 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 100μA 500mA CIN = COUT = 2.2μF Output Voltage vs. Input Voltage 1.6 1.7 1.8 1.9 2.5 3 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 100μA 500mA CIN = COUT = 2.2μF Output Voltage vs. Output Current (V OUT1) 2.2 2.3 2.4 2.5 2.6 2.7 0 100 200 300 400 500 OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) VIN = VEN1 = 3.5V VOUT1 = 2.5V CIN = COUT = 2.2μF Output Voltage vs. Output Current (V OUT2) 1.5 1.6 1.7 1.8 1.9 0 100 200 300 400 500 OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) VIN = VEN2 = 3.5V VOUT2 = 1.8V CIN = COUT = 2.2μF Ground Current vs. Input Voltage (Single Output) 2.5 3 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) GROUND CURRENT (μA) 500mA NO LOAD VOUT2 = 1.8V CIN = COUT = 2.2μF VEN1 = GND, VEN2 = VIN Ground Current vs. Input Voltage (Dual Output) 105 120 2.5 3 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) GROUND CURRENT( μA) 500mA NO LOAD VOUT1 = 2.5V, V OUT2 = 1.8V CIN = COUT = 2.2μF VEN1 = VEN2 = VIN Ground Current vs. Output Current 105 120 0 50 100 150 200 250 300 350 400 450 500 OUTPUT CURRENT (mA) GROUND CURRENT( μA) DUAL OUTPUT SINGLE OUTPUT VIN = 3.5V CIN = COUT = 2.2μF Ground Current vs. Temperature (Single Output) -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) GROUND CURRENT ( μA) 500mA NO LOAD VOUT1 =2.5V VEN1 = VIN = 3V VEN2 = GND CIN = COUT = 2.2μF
Micrel, Inc. MIC5355/6 March 2012 6 M9999-031512-A Typical Characteristics (Continued) Ground Current vs. Temperature (Dual Output) 100 120 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) GROUND CURRENT ( μA) NO LOAD 500mA VOUT1 = 2.5V, V OUT2 = 1.8V VEN1 = VEN2 = VIN = 3.5V CIN = COUT = 2.2μF Dropout Voltage vs. Temperature 100 150 200 250 300 350 400 450 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) DROPOUT VOLTAGE (mV) 150mA 300mA 500mA CIN = COUT = 2.2μF 50mA Dropout Voltage vs. Output Current 100 150 200 250 300 350 0 100 200 300 400 500 OUTPUT CURRENT (mA) DROPOUT VOLTAGE (mV) VOUT1 = 2.5V CIN = COUT = 2.2μF Current Limit vs. Input Voltage 600 650 700 750 800 850 900 2 . 53 3 . 544 . 555 . 5 INPUT VOLTAGE (V) CURRENT LIMIT (mA) VOUT1 = 2.5V VOUT2 = 1.8V CIN = COUT = 2.2μF Output Noise Spectral Density 0.001 0.01 0.1 10 100 1000 10000 100000 1000000 FREQUENCY (Hz) NOISE (µV/√Hz) VIN = 3.5V VOUT2 = 1.81V CIN - COUT = 2.2µF Noise (10Hz to 100Khz) =146µVrms
Micrel, Inc. MIC5355/6 March 2012 7 M9999-031512-A Functional Characteristics
Micrel, Inc. MIC5355/6 March 2012 8 M9999-031512-A Functional Diagrams MIC5355 Block Diagram MIC5356 Block Diagram
Micrel, Inc. MIC5355/6 March 2012 9 M9999-031512-A
Application Information
MIC5355/6 is a dual 500mA LDO. The MIC5356 includes an auto-discharge circuit for each LDO output that is activated when the output is disabled. The MIC5355/6 regulator is fully protected from damage due to fault conditions through linear current limiting and thermal shutdown. Input Capacitor The MIC5355/6 is a high-performance, high-bandwidth device. A 2.2µF input capacitor from the input pin to ground is required to provi de stability. Low-ESR ceramic capacitors provide optimal performance in small board area. 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. X5R or X7R dielectrics are recommended for the input capacitor. Y5V dielectrics lose most of their capacitance over temperature and are therefore not recommended. Output Capacitor The MIC5355/6 requires an output capacitor of 2.2µF 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 2.2µF ceramic output capacitor and does not improve significantly with larger capacitance. X7R and X5R dielectric ceramic capacitors are recommended because of their temperature performance. X7R 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 t heir 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 equiva lent operating temperature range. No Load Stability Unlike many other voltage regulators, the MIC5355/6 will remain stable and in regulation with no load. Enable/Shutdown The MIC5355/6 comes with two active high enable pins that allow each regulator to be disabled independently. Forcing the enable pin low disables the regulator and places it into an off mode current state drawing virtually zero current. When disabled, the MIC5356 switches an internal 30 Ω load on the regulator output to discharge the external capacitor. Forcing the enable pin high enables the output voltage. The active high enable pin uses CMOS technology and cannot be left floating. A floating enable pin may cause an indeterminate state on the output. Thermal Considerations The MIC5355/6 is designed to provide two 500mA continuous current outputs in a small package. Maximum operating temperature can be calculated based on the output currents and the voltage drop across the part. For example, if the input voltage is 3.0V, V OUT1 = 2.5V, V OUT2 = 1.8V and each with an output current = 500mA. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN VOUT1) IOUT (VIN VOUT2) IOUT2 VIN IGND Because this is CMOS device and the ground current is typically <100µA over the load range, the power dissipation contributed by the ground current is <1% which can be ignored for this calculation: P D = 0.85W 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: JA AJ(MAX) D(MAX) θ TT P TJ(MAX) = 125°C θJA = 64.4°C/W
Micrel, Inc. MIC5355/6 March 2012 10 M9999-031512-A Substituting PD for P D(MAX) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The junction to ambient thermal resistance for the minimum footprint is 64.4°C/W. The maximum power dissipation must not be exceeded for proper operation. For example, when operating a 2.5V/1.8V application with an input voltage of 3.0V and 500mA at each output with a minimum footprint layout, the maximum ambient operating temperature T A can be determined as follows: TA = 70.3°C Therefore, a MIC5355-JGYMME application with 500mA at each output current can accept an ambient operating temperature of 70.3°C in a small 8-pin ePad MSOP 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
Micrel, Inc. MIC5355/6 March 2012 11 M9999-031512-A Typical Application Schematic Bill of Materials Item Part Number Manufacturer Description Qty. C1, C2, C3 C1005X5R0J225M TDK (1) 2.2µF ceramic capacitor, 6.3V, X5R, size 0402 3 U1 MIC5355/6-xxYMME Micrel, Inc. (2) Dual 500mA µCap Low-Dropout, Mi cropower Linear Regulator 1 Notes: 1. TDK: www.tdk.com.
Micrel, Inc. MIC5355/6 March 2012 12 M9999-031512-A Typical Application Schematic (Continued) Bill of Materials Item Part Number Manufacturer Description Qty. C1, C2, C3 C1005X5R0J225M TDK (1) 2.2µF ceramic capacitor, 6.3V, X5R, size 0402 3 U1 MIC5355/6-xxYML Micrel, Inc. (2) Dual 500mA µCap Low-Dropout, Mi cropower Linear Regulator 1 Notes: 3. TDK: www.tdk.com.
Micrel, Inc. MIC5355/6 March 2012 13 M9999-031512-A PCB Layout Recommendations (MME Package) Top Layer Bottom Layer
Micrel, Inc. MIC5355/6 March 2012 14 M9999-031512-A PCB Layout Recommendations (ML Package) Top Layer Bottom Layer
Micrel, Inc. MIC5355/6 March 2012 15 M9999-031512-A
Package Information
8-Pin ePad MSOP (MME) 8-Pin ePad 3mm x 3mm MLF® (ML)
Micrel, Inc. MIC5355/6 March 2012 16 M9999-031512-A Package Information (Continued) Red circle indicates Thermal Via. Size should be .300 −.350mm in diameter, 1/00mm pitch, and it should be connected to GND plane for maximum thermal performance. 8-Pin ePad MSOP (MME)
Micrel, Inc. MIC5355/6 March 2012 17 M9999-031512-A Package Information (Continued) Red circle indicates Thermal Via. Size should be .300 −.350mm in diameter, 1/00mm pitch, and it should be connected to GND plane for maximum thermal performance. 8-Pin ePad 3mm x 3mm MLF® (ML)
Micrel, Inc. MIC5355/6 March 2012 18 M9999-031512-A 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 Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. 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. © 2012 Micrel, Incorporated.