FAN2012MPX

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It provides up to 1.5 A continuous-load current from the 4.5 V to 5.5 V input. The output voltage is adjustable over a wide range of 0.8 V to 3.5 V by means of an external voltage divider. 95% Efficiency, Synchronous Operation Adjustable Output Voltage from 0.8 V to 3.5 V 4.5 V to 5.5 V Input Voltage Range Up to 1.5 A Output Current Fixed-Frequency 1.3 MHz PWM Operation Soft Start Excellent Load Transient Response 3 x 3 mm, 6-Lead, MLP A current-mode control loop with a fast transient response ensures excellent line and load regulation. The fixed 1.3 MHz switching frequency enables designers to choose a small, inexpensive external inductor and capacitor. Filtering is easily accomplished with very small components. Applications      The FAN2012 has an “Enable Input” and the device can be put in shutdown mode, in which the ground current falls below 1 µA. Hard Disk Drive Set-Top Box Protection features include input under-voltage lockout, short-circuit protection, and thermal shutdown. Softstart limits inrush current during start-up conditions. Point-of-Load Power Notebook Computer Communications Equipment The device is available in a 3x3 mm 6-lead molded leadless package (MLP), making it possible to build a 1.5 A complete DC-DC converter in limited space on the printed circuit board (PCB). Ordering Information Part Number Output Voltage Operating Temperature Range FAN2012MPX Adjustable 0°C to 85°C 3x3 mm 6-Lead MLP FAN2012EMPX Adjustable -40°C to 85°C 3x3 mm 6-Lead MLP © 2004 Fairchild Semiconductor Corporation FAN2012 • Rev. 1.0.5 Package www.fairchildsemi.com FAN 2012 — 1.5 A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator October 2013 FB R2 EN 1 6 10K PGND R1 L1 VOUT SW P1 (AGND) 2 3 5 4 3.3H VIN +5V PVIN 10F 4 x 10F Figure 1. Typical Application Pin Configuration Figure 2. Pin Assignments Pin Definitions Pin # Name Description P1 AGND 1 FB 2 PGND 3 SW 4 PVIN 5 VIN Supply Voltage Input. 6 EN Enable Input. Logic HIGH enables the chip and logic LOW disables the chip, reducing the supply current to less than 1 µA. Do not float this pin. Analog Ground. P1 must be soldered to the PCB ground. FAN 2012 — 1.5 A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Typical Application Feedback Input. Adjustable voltage option; connect this pin to the resistor divider. Power Ground. This pin is connected to the internal MOSFET switches. This pin must be externally connected to AGND. Switching Node. This pin is connected to the internal MOSFET switches. Supply Voltage Input. This pin is connected to the internal MOSFET switches. © 2004 Fairchild Semiconductor Corporation FAN2012 • Rev. 1.0.5 www.fairchildsemi.com 2 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 Parameter VIN Input Voltage VIN Input Voltage on PVIN and Any Other Pin Thermal Resistance-Junction to Tab TL Lead Soldering Temperature (10 Seconds) Storage Temperature TJ Junction Temperature ESD Max. Unit -0.3 6.5 V -0.3 VIN V (1) JC TSTG Min. Electrostatic Discharge Protection Level (2) 8 °C/W 260 °C -65 150 °C -40 150 °C HBM 4 CDM 2 kV Notes: 1. Junction-to-ambient thermal resistance, JA, is a strong function of PCB material, board thickness, thickness and number of copper planes, number of via used, diameter of via used, available copper surface, and attached heat sink characteristics. 2. Using Mil Std. 883E, method 3015.7 (Human Body Model) and EIA/JESD22C101-A (Charged Device Model). 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. Symbols VIN Parameter Min. Typ. Max. Unit Supply Voltage Range 4.5 5.5 V VOUT Output Voltage Range, Adjustable Version 0.8 3.5 V IOUT Output Current 1.5 A L CIN COUT TA Inductor (3) Input Capacitor (3) Output Capacitor (3) Operating Ambient Temperature Range FAN2012MPX FAN2012EMPX 3.3 µH 10 µF 4 x 10 µF 0 +85 °C -40 +85 °C FAN 2012 — 1.5 A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Absolute Maximum Ratings Notes: 3. Refer to the Applications section for details. © 2004 Fairchild Semiconductor Corporation FAN2012 • Rev. 1.0.5 www.fairchildsemi.com 3 VIN = 4.5 V to 5.5 V, VOUT = 1.2 V, IOUT = 200 mA, CIN = 10 µF, COUT = 4 x 10 µF, L = 3.3 µH, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C. Symbol Parameter VIN Input Voltage IQ Quiescent Current VUVLO Conditions Min. Typ. Max. Units 5.5 V 7 10 mA 3.7 4.0 V 4.5 IOUT = 0 mA VIN Rising UVLO Threshold 3.4 Hysteresis 150 mV RON_PMOS PMOS On Resistance VIN = VGS = 5 V 150 290 RON_NMOS NMOS On Resistance VIN = VGS = 5 V 150 290 ILIMIT P-Channel Current Limit 4.5 V < VIN < 5.5 V 2.6 3.5 TOVP Over-Temperature Protection Rising Temperature 150 °C Hysteresis 20 °C fSW 2.2 Switching Frequency 1000 1300 RLINE Line Regulation VIN = 4.5 to 5.5 V, IOUT = 100 mA 0.16 RLOAD Load Regulation 0 mA ≤ IOUT ≤ 1500 mA 0.2 VOUT Output Voltage During (4) Load Transition IOUT from 700 mA to 100 mA ILEAK Reverse Leakage Current VIN = Open, EN = GND, VSW = 5.5 V into Pin SW 0.1 VREF Reference Voltage 0.8 VOUT Output Voltage Accuracy VIN = 4.5 to 5.5 V, 0 mA ≤ IOUT ≤ 1500 mA ISD Shutdown Mode Supply Current VEN = 0 V IBIAS EN Bias Current VENH EN HIGH Voltage VENL EN LOW Voltage IOUT from 100 mA to 700 mA kHz 0.5 % 5 % % 1.0 µA V FAN2012MPX -2 2 % FAN2012EMPX -3 3 % 1.0 µA 0.1 µA 0.1 1.3 V 0.4 Figure 3. A %/V -5 Notes: 4. Please refer to the load transient response test waveform shown in Figure 3. © 2004 Fairchild Semiconductor Corporation FAN2012 • Rev. 1.0.5 1600 M V FAN 2012 — 1.5 A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Electrical Characteristics Load Transient Response Test Waveform www.fairchildsemi.com 4 TA = 25°C, CIN = 10 µF, COUT = 40 µF, L = 3.3 µH, VIN = 5 V; unless otherwise noted. 1.214 T em p T em p T em p T em p T em p Outp ut V o ltag e (V) 1.212 1.210 1.208 ( ( ( ( ( C ) vs . V OUT @ 0 m A C ) vs . V OUT @ 100m A C ) vs . V OUT @ 500 m A C ) vs . V OUT @ 1000 m A C ) vs . V OUT@ 1500 m A 1.206 1.204 1.202 1.200 1.198 1.196 1.194 -40 -20 0 20 40 60 80 100 120 A m b ien t Tem p eratu re (°C) Figure 4. Output Voltage vs. Ambient Temperature Sw itch in g Freq ue nc y ( KHz) 1260 1255 1250 1245 1240 1235 1230 0 20 40 60 80 100 120 A m b ien t Tem p eratu re (°C) Figure 5. Switching Frequency vs. Ambient Temperature FAN 2012 — 1.5 A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Typical Performance Characteristics Po wer Eff iciency ( % ) 100 V O U T = 3 .3 V 90 80 V O U T = 1 .2 V 70 V I N = 4 .5 V 60 V IN = 5 V 50 40 V I N = 5 .5 V 30 10 100 1000 1000 0 Loa d C u rren t ( mA ) Figure 6. © 2004 Fairchild Semiconductor Corporation FAN2012 • Rev. 1.0.5 Efficiency vs. Load Current www.fairchildsemi.com 5 (Continued) TA = 25°C, CIN = 10 µF, COUT = 40 µF, L = 3.3 µH, VIN = 5 V; unless otherwise noted. Star t-up Res ponse Star t- up Resp on se In put Vo lt ag e (5V/div) Inp ut Vo lt ag e (5V/div ) SW No d e Vo lt ag e (5V/div ) SW N od e Vo lt age (5V/div) In du cto r Current (200m A /di v ) In duc tor Cu rren t (200mA /div ) Out put Vo ltag e (500m V/d iv ) Ou tpu t Vo lt age (1V/di v) V O UT = 1 .2 V IO UT = 1 0 0 m A V O UT = 3 .3 V IO UT = 1 0 0 m A Ti m e (50 µs/div) Figure 7. Ti m e (100 µs/div) Startup Response Figure 8. Start-up Re spo n s e Star t- up Response In put Vo lt ag e (5V/div) In pu t Vo ltag e (5V/di v ) SW No d e Vo lt ag e (5V/div ) SW N ode Vo lt ag e (5V/div ) In du cto r Current (500m A /di v ) Indu cto r Cur rent (500m A/d iv) Out put Vo ltag e (500m V/d iv ) Startup Response Ou tpu t Vo lt ag e (1V/di v) V O UT = 1 .2 V IO UT = 1 5 0 0 m A V O U T = 3 .3 V IO UT = 1 5 0 0 m A Ti m e (100 µs/div) Ti m e (100 µs/div) Figure 9. Startup Response Figure 10. Tran sien t Re spon se Startup Response Tr an sie n t Re spons e FAN 2012 — 1.5 A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Typical Performance Characteristics 700mA Lo ad Current Lo ad Cu rrent 100mA SW No d e Vo lt ag e (5V/div ) SW N ode Vo lt ag e (5V/div ) Out put Vo ltag e (20m V/d iv) Ou tpu t Vo lt age (20m V/div ) In du cto r Current (200m A /di v ) Ind u ct or Curr ent (200m A/d iv) 700mA 100mA V O U T = 1 .2 V V O U T = 1 .2 V Ti m e (5 µs/div) Ti m e (5µs/div) Figure 11. Transient Response © 2004 Fairchild Semiconductor Corporation FAN2012 • Rev. 1.0.5 Figure 12. Transient Response www.fairchildsemi.com 6 Figure 13. Block Diagram Detailed Operation Description possible voltage drops of the input voltage and eliminates the output voltage overshoot. The soft-start is implemented as a digital circuit, increasing the switch current in four steps to the P-channel current limit (2600 mA). Typical start-up time for a 40 µF output capacitor and a load current of 1500 mA is 800 µs. The FAN2012 is a step-down pulse width modulated (PWM) current mode converter with a typical switching frequency of 1.3 MHz. At the beginning of each clock cycle, the P-channel transistor is turned on. The inductor current ramps up and is monitored via an internal circuit. The P-channel switch is turned off when the sensed current causes the PWM comparator to trip when the output voltage is in regulation or when the inductor current reaches the current limit (set internally, typically 2600 mA). After a minimum dead time, the Nchannel transistor is turned on and the inductor current ramps down. As the clock cycle is completed, the Nchannel switch is turned off and the next clock cycle starts. The duty cycle is solely given by the ratio of output voltage and input voltage. Therefore, the converter runs with a minimum duty cycle when output voltage is at minimum and input voltage is at maximum. FAN 2012 — 1.5 A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Block Diagram Short-Circuit Protection The switch peak current is limited cycle by cycle to a typical value of 2600 mA. In the event of an output voltage short circuit, the device operates with a frequency of 400 kHz and minimum-duty cycle, therefore the average input current is typically 350 mA. Thermal Shutdown When the die temperature exceeds 150°C, a reset occurs and remains in effect until the die cools to 130°C, at which point, the circuit restarts. UVLO and Soft Start The reference and the circuit remain reset until the V IN crosses its UVLO threshold. The FAN2012 has an internal soft-start circuit that limits the in-rush current during start-up. This prevents © 2004 Fairchild Semiconductor Corporation FAN2012 • Rev. 1.0.5 www.fairchildsemi.com 7 Setting the Output Voltage PCB Layout Recommendations The internal voltage reference is 0.8 V. The output is divided down by a voltage divider, R1 and R2 to the FB pin. The output voltage is: The inherently high peak currents and switching frequency of power supplies require a careful PCB layout design. For best results, use wide traces for highcurrent paths and place the input capacitor, the inductor, and the output capacitor as close as possible to the integrated circuit terminals. To minimize voltage stress to the device resulting from ever-present switching spikes, use an input bypass capacitor with low ESR. Use of an external Schottky diode, with its anode connected to SW node and cathode connected to PVIN, further reduces switching spikes. Note that the peak amplitude of the switching spikes depends upon the load current; the higher the load current, the higher the switching spikes. V O UT = V REF R 1 + -----1R EQ. 2 2 According to this equation, and assuming desired output voltage of 1.5096 V, and given R2 = 10 k, the calculated value of R1 is 8.87 k. Inductor Selection The inductor parameters directly related to device performance are saturation current and DC resistance. The FAN2012 operates with a typical inductor value of 3.3 µH. The lower the DC resistance, the higher the efficiency. For saturation current, the inductor should be rated higher than the maximum load current, plus half of the inductor ripple current calculated as follows: 1 – ( VO U T ⁄ VIN) ∆ IL = VO U T × ------------------------------------------L×f The resistor divider that sets the output voltage should be routed away from the inductor to avoid RF coupling. The ground plane at the bottom side of the PCB acts as an electromagnetic shield to reduce EMI. The recommended PCB layout is shown below in Figure 14. EQ. 3 where: IL = Inductor Ripple Current f = Switching Frequency L = Inductor Value Some recommended inductors are suggested in the table below: Table 1. Recommended Inductors Inductor Value Vendor Part Number 3.3 µH Panasonic ELL6PM3R3N 3.3 µH Murata LQS66C3R3M04 3.3 µH Coiltronics SD-3R3-R Figure 14. Capacitors Selection For best performances, a low-ESR input capacitor is required. A ceramic capacitor of at least 10 µF, placed as close to the VIN and AGND pins of the device is recommended. The output capacitor determines the output ripple and the transient response. Recommended PCB Layout FAN 2012 — 1.5 A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Applications Information Table 2. Recommended Capacitors Capacitor Value Vendor Taiyo Yuden 10 µF TDK Murata © 2004 Fairchild Semiconductor Corporation FAN2012 • Rev. 1.0.5 Part Number JMK212BJ106MG JMK316BJ106KL C2012X5ROJ106K C3216X5ROJ106M GRM32ER61C106K www.fairchildsemi.com 8 3.0 0.15 C 3.50 2.45 A 2X B 3.50 1.65 0.45 2.10 3.0 (0.70) 0.15 C PIN #1 IDENT 0.95 TYP 0.45 TYP 2X TOP VIEW RECOMMENDED LAND PATTERN 0.8 MAX 0.10 C (0.20) 0.08 C 0.05 0.00 C SIDE VIEW SEATING PLANE 2.25 PIN #1 IDENT 3 1 0.45 0.20 0.40 0.2 MIN 1.65 4 6 0.30~0.45 0.95 1.90 0.10 0.05 C A B C BOTTOM VIEW A. CONFORMS TO JEDEC REGISTRATION MO-229, VARIATION WEEA, DATED 11/2001 EXCEPT FOR DAP EXTENSION TABS FAN 2012 — 1.5 A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Physical Dimensions B. DIMENSIONS ARE IN MILLIMETERS. C. DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994 Figure 15. 3x3 mm, 6-Lead, Molded Leadless Package (MLP) Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/dwg/ML/MLP06F.pdf. © 2004 Fairchild Semiconductor Corporation FAN2012 • Rev. 1.0.5 www.fairchildsemi.com 9 FAN 2012 — 1.5 A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator © 2004 Fairchild Semiconductor Corporation FAN2012 • Rev. 1.0.5 www.fairchildsemi.com 10 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. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. 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