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FAN25800 500 mA, Low-IQ, Low-Noise, LDO Regulator Features Description VIN: 2.3 V to 5.5 V Low IQ of 17 µA in Regulation and Low-IQ Dropout Mode with Optimized Dropout Transitions The FAN25800 is a linear low-dropout regulator with a high PSRR (85 dB at 100 Hz) and low output noise (typically 8 µVRMS over a 10 Hz to 100 kHz bandwidth). The LDO can provide up to 500 mA of output current. VOUT = 2.7 V, 3.3 V (IOUT Max. = 500 mA) VOUT = 2.8 V (IOUT Max. = 250 mA) Output Noise Density at 250 mA and 10 kHz = 19 nV/√Hz (Integrated 8 µVrms) <70 mV Dropout Voltage at 250 mA Load 4-Ball WLCSP, 0.65 mm x 0.65 mm, 0.35 mm Pitch, Plated Solder, 330 µm Maximum Thickness Controlled Soft-Start to Reduce Inrush Current The enable control pin can be used to shut down the device and disconnect the output load from the input. During shutdown, the supply current drops below 1 µA. The FAN25800 is designed to be stable with spacesaving ceramic capacitors as small as 0201 case size. The FAN25800 is available in a 4-bump, 0.35 mm pitch, WLCSP package. Thermal Shutdown Protection (TSD) Input Under-Voltage Lockout (UVLO) VIN Short-Circuit Protection (SCP) 1.5µF FAN25800 Stable with Two 1.5 µF, 0201 Ceramic Capacitors at VOUT VOUT 1.5µF 1.5µF EN GND Applications Figure 1. Typical Application WiFi Modules PDA Handsets Smart Phones, Tablets, Portable Devices Ordering Information (1) Part Number VOUT IOUT_MAX FAN25800AUC33X 3.3 V 500 mA FAN25800AUC28X 2.8 V 250 mA FAN25800AUCF27X 2.7 V 500 mA Operating Temperature Package Packing Method -40°C to 85°C 4-Bump, WLCSP, 0.65 x 0.65 mm, 0.35 mm Pitch Tape & Reel Note: 1. For other trim options, please contact a Fairchild representative. © 2014 Fairchild Semiconductor Corporation FAN25800 • Rev. 1.5 www.fairchildsemi.com FAN25800 — 500 mA, Low-IQ, Low-Noise, LDO Regulator April 2015 VOUT Q1 VIN CIN COUT FILTER VREF EN GND Figure 2. IC and System Block Diagram Table 1. Recommended External Components Component Description Vendor CIN 1.5 µF, 6.3 V, X5R, 0201 Murata GRM033R60J155M COUT CAlternative 2x1.5 µF, 6.3 V, X5R, 0201 (3) 1.0 µF, 6.3 V, X5R, 0201 Parameter Typ. Unit Murata GRM033R60J155M C Murata GRM033R60J105M 1.5 (2) µF 1.5 (2) µF 1.0 (2) µF Notes: 2. Capacitance value does not reflect effects of bias, tolerance, and temperature. See Recommended Operating Conditions and Operation Description sections for more information. 3. CAlternative can be used for both CIN and COUT. FAN25800 is stable with one 1 µF at CIN and one 1 µF at COUT. Pin Configuration VIN A1 A2 VOUT EN B1 B2 GND VOUT A2 GND Figure 3. Top-Through View B2 A1 VIN B1 EN Figure 4. Bottom View Pin Definitions Pin # Name A1 VIN A2 VOUT B1 EN B2 GND Description Input Voltage. Connect to input power source and CIN. Output Voltage. Connect to COUT and load. Enable. The device is in Shutdown Mode when this pin is LOW. No internal pull-down. (4) Do not leave this pin floating. Recommended to not tie EN pin directly to VIN. Ground. Power and IC ground. All signals are referenced to this pin. Note: 4. Recommended to use logic voltage of 1.8 V to drive the EN pin. © 2014 Fairchild Semiconductor Corporation FAN25800 • Rev. 1.5 www.fairchildsemi.com 2 FAN25800 — 500 mA, Low-IQ, Low-Noise, LDO Regulator Block Diagram Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol VIN Parameter Input Voltage with Respect to GND VCC Min. Max. -0.3 6.0 Unit V (5) Voltage on Any Other Pin (with Respect to GND) -0.3 VIN+0.3 TJ Junction Temperature -40 +150 °C TSTG Storage Temperature -65 +150 °C +260 °C TL Lead Soldering Temperature, 10 Seconds Electrostatic Discharge Protection Level ESD LU Human Body Model, ANSI/ESDA/JEDEC JS-001-2012 4000 Charged Device Model per JESD22-C101 1500 Latch Up V V JESD 78D Note: 5. Lesser of 6.0 V or VIN + 0.3 V. Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings. Symbol VIN Parameter Min. Supply Voltage (7) IOUT_MAX Typ. 2.3 Max. 5.5 Output Current (VOUT = 2.7 V, 3.3 V) IOUT_Recommend Output Current (VOUT = 3.3 V) Output Current (VOUT = 2.7 V, 2.8 V) CIN COUT Input Capacitor (Effective Capacitance) (8) Output Capacitor (Effective Capacitance) (8) 0.4 0.8 0.4 0.8 (6) Unit V 500 mA 500 mA 250 mA µF 15.0 µF TA Ambient Temperature –40 +85 °C TJ Junction Temperature –40 +125 °C Note: 6. For VIN ≥ 3.4 V, thermal properties of the device must be taken into account at maximum load of 500 mA; refer to JA thermal properties. 7. IOUT_MAX is for VIN = VOUT + 0.3 V. 8. Effective capacitance, including the effects of bias, tolerance, and temperature. See the Operation Description section for more information. Thermal Properties Junction-to-ambient thermal resistance is a function of application and board layout. This data is measured with four-layer 2s2p boards in accordance to JEDEC standard JESD51. Special attention must be paid not to exceed junction temperature, TJ(max), at a given ambient temperature, T A. Symbol JA Parameter Junction-to-Ambient Thermal Resistance © 2014 Fairchild Semiconductor Corporation FAN25800 • Rev. 1.5 Typ. Unit 180 °C/W www.fairchildsemi.com 3 FAN25800 — 500 mA, Low-IQ, Low-Noise, LDO Regulator Absolute Maximum Ratings Minimum and maximum values are at VIN = VOUT + 0.3 V; TA = -40°C to +85°C; and test circuit shown in Figure 1. Typical values are at VIN = VOUT + 0.3 V, TA = 25°C, ILOAD = 10 mA, and VEN = 1.8 V, unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Unit LDO IIN VIN = VOUT + 0.3 V to 4.2 V, ILOAD = 0 mA VIN Supply Current (10) Dropout , ILOAD = 0 mA IOUT = 10 mA, VIN = 3.6 V, VOUT = 3.3 V PSRR Power Supply Rejection (9) Ratio IOUT = 250 mA, VIN = 3.6 V, VOUT = 3.3 V en Output Noise Voltage (9) Density f = 10 kHz, VOUT = 3.3 V en_bw Output Noise Voltage (9) (Integrated) f = 10 Hz – 100 kHz, VOUT = 3.3 V VDO VOUT Dropout Voltage ΔVOUT VOUT Voltage Accuracy (10) ΔVOUT_LOAD Load Regulation ILIM VOUT Current Limit 25.0 18.5 30.0 µA f = 50 Hz 84 f = 100 Hz 85 f = 1 kHz 84 f = 10 kHz 79 f = 50 Hz 68 f = 100 Hz 73 f = 1 kHz 75 f = 10 kHz 76 IOUT = 10 mA 20 40 IOUT = 250 mA 19 39 IOUT = 10 mA 8 25 IOUT = 250 mA 8 25 70 130 mV +1.9 % 12 35 µV/mA VOUT = VOUT_TARGET – 100 mV, IOUT = 250 mA 5 mA ≤ IOUT ≤ IOUT_Recommend, VIN = VOUT + 0.3 V to 4.2 V -1.9 IOUT = 5 mA to IOUT_MAX dB IOUT = 0 mA → Current Limit, VOUT = 3.3 V, 2.7V, VOUT Drops by 2% 550 650 800 IOUT = 0 mA → Current Limit, VOUT = 2.8 V, VOUT Drops by 2% 275 323 400 Shutdown Supply Current VEN = 0 V, VIN = VOUT + 0.3 V to 4.2 V VUVLO Under-Voltage Lockout Threshold Rising VIN VUVHYS Under-Voltage Lockout Hysteresis tSTART Startup Time TSD Thermal Shutdown ISD 17.0 nV/√Hz µVRMS mA 0.125 1.000 2.1 2.3 150 Rising EN to 95% VOUT, IOUT = 10 mA 250 Rising Temperature 150 Hysteresis 20 µA V mV 500 µs °C Logic Levels: EN VIH Enable High-Level Input Voltage VIL Enable Low-Level Input Voltage IEN Input Bias Current 1.05 VEN = 1.8 V V 0.04 0.4 V 1.00 µA Notes: 9. Guaranteed by design; not tested in production. 10. Dropout voltage = VIN - VOUTx when VOUT drops more than 100 mV below the nominal regulated VOUT level. © 2014 Fairchild Semiconductor Corporation FAN25800 • Rev. 1.5 www.fairchildsemi.com 4 FAN25800 — 500 mA, Low-IQ, Low-Noise, LDO Regulator Electrical Specifications Unless otherwise specified; VIN = 3.6 V, VOUT = 3.3 V, TA = +25°C, and test circuit per Figure 1. Figure 5. Output Regulation vs. Load Current and Input Voltage Figure 6 Output Regulation vs. Load Current and Temperature Figure 7. Quiescent Current vs. Input Voltage and Temperature Figure 8. Shutdown Current vs. Input Voltage and Temperature Figure 9. PSRR vs. Frequency, 10 mA Load Figure 10. Output Noise Voltage vs. Frequency, 10 mA Load © 2014 Fairchild Semiconductor Corporation FAN25800 • Rev. 1.5 www.fairchildsemi.com 5 FAN25800 — 500 mA, Low-IQ, Low-Noise, LDO Regulator Typical Characteristics Unless otherwise specified; VIN = 3.6 V, VOUT = 3.3 V, TA = +25°C, and test circuit per Figure 1. Figure 11. Load Transient, IOUT = 10 → 250 → 10 mA, VIN=3.6 V, 400 ns Edge Figure 12. Line Transient, VIN = 4.0 → 3.6 → 4.0 V, 10 µs Transitions, 10 mA Load Figure 13. Line Transient, VIN = 4.0 → 3.6 → 4.0 V, 10 µs Transitions, 250 mA Load Figure 14. Startup, 10 mA Load Figure 15. Startup, 250 mA Load © 2014 Fairchild Semiconductor Corporation FAN25800 • Rev. 1.5 www.fairchildsemi.com 6 FAN25800 — 500 mA, Low-IQ, Low-Noise, LDO Regulator Typical Characteristics The FAN25800 is a linear low-dropout (LDO) regulator that has high PSRR and low output noise. The enable control pin can be used to shut down the device and disconnect the output load from the input. During shutdown, the supply current drops below 1 µA. The LDO is designed to be stable with space-saving ceramic capacitors as small as 0201 case size. characteristics of the capacitors must be considered when selecting the voltage rating and the case size of the capacitor. Figure 16 is a typical derating curve for a 0201 case size, 1.5 µF, 6.3 V, X5R capacitor. Enable and Soft-Start When EN is LOW, all circuits are off and the IC draws <550 nA of current. The EN pin does not have an internal pull-down resistor and must not be left floating. When EN is HIGH and VIN is above the UVLO threshold, the regulator begins a soft-start cycle for the output. The soft-start cycle controls inrush current, limiting it to the ILIM peak current limit. Short-Circuit and Thermal Protection The output current is short-circuit protected. When an output fault occurs, the output current is automatically limited to ILIM and VOUT drops. The resultant VOUT is equal to ILIM multiplied by the fault impedance. Short-circuit fault or output overload may cause the die temperature to increase and exceed the maximum rating due to power dissipation. In such cases (depending upon the ambient temperature; the VIN, load current, and thermal resistance (θJB) of the mounted die), the device may enter thermal shutdown. If the die temperature exceeds the thermal shutdown temperature threshold, the onboard thermal protection disables the output until the temperature drops below its hysteresis value. At that point, the output is re-enabled and a new soft-start sequence occurs. Figure 16. Capacitor DC Bias Characteristics Typical Application for Post Regulation Due to its high PSRR and low output noise, the FAN25800 can be used as a post-DC-DC regulator to reduce output ripple and output noise at high efficiency for noise-sensitive applications. Figure 17 shows a postDC-DC regulation of the LDO with a buck converter. The capacitor on the output of the buck converter can be shared by the LDO as its input capacitor. L 5.0 V VIN C1 EN DC-DC Converter SW 3.6 V VIN GND VOUT FAN25800 C2 EN 3.3 V C3 GND Thermal Considerations For best performance, the die temperature and the power dissipated should be kept at moderate values. The maximum power dissipated can be evaluated based on the following relationship: TJ (max) TA PD(max) JA (1) where TJ(max) is the maximum allowable junction temperature of the die; TA is the ambient operating temperature; and θJA is dependent on the surrounding PCB layout and can be improved by providing a heat sink of surrounding copper ground. Figure 17. LDO as Post DC-DC Regulator PCB Layout Recommendations Capacitors should be placed as close to the IC as possible. All power and ground pins should be routed to their capacitors using top copper. The copper area connecting to the IC should be maximized to improve thermal performance. The addition of backside copper with through-holes, stiffeners, and other enhancements can help reduce θJA. The heat contributed by the dissipation of devices nearby must be included in design considerations. Capacitor Selection An output capacitor with an effective capacitance between 400 nF and 15 µF is required for loop stability. The ESR value should be within 3 to 100 m. DC bias © 2014 Fairchild Semiconductor Corporation FAN25800 • Rev. 1.5 Figure 18. Recommended Layout www.fairchildsemi.com 7 FAN25800 — 500 mA, Low-IQ, Low-Noise, LDO Regulator Circuit Description D E X Y 0.65 ±0.025 mm 0.65 ±0.025 mm 0.15 mm 0.15 mm © 2014 Fairchild Semiconductor Corporation FAN25800 • Rev. 1.5 www.fairchildsemi.com 8 FAN25800 — 500 mA, Low-IQ, Low-Noise, LDO Regulator Product-Specific Dimensions ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. 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