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| FAN2013 -- 2A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator January 2008 FAN2013 -- 2A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Features 95% Efficiency, Synchronous Operation Adjustable Output Voltage from 0.8V to VIN-1 4.5V to 5.5V Input Voltage Range Up to 2A Output Current Fixed-Frequency 1.3 MHz PWM Operation 100% Duty Cycle Low-Dropout Operation (LDO) Soft-Start Function Excellent Load Transient Response Power-Good Flag Over-Voltage, Under-Voltage Lockout, ShortCircuit, and Thermal Shutdown Protections 3x3mm 6-lead MLP Package Description The FAN2013 is a high-efficiency, low-noise, synchronous Pulse Width Modulated (PWM) currentmode DC-DC converter designed for low-voltage applications. It provides up to 2A continuous-load current from the 4.5V to 5.5V input. The output voltage is adjustable over a wide range by means of an external voltage divider. The FAN2013 is enabled when the input voltage on the VIN pin exceed the UVLO threshold. A current-mode control loop with a fast transient response ensures excellent line and load regulation. The fixed 1.3MHz switching frequency enables designers to choose a small, inexpensive external inductor and capacitor. Filtering can be accomplished with small components, reducing space and cost. Protection features include input under-voltage lockout, short-circuit protection, and thermal shutdown. Softstart limits inrush current during start-up conditions. The device is available in a 3x3mm 6-lead MLP. Applications Hard Disk Drive Set-Top Box Point-of-Load Power Notebook Computer Communications Equipment Typical Application VIN PG R3 10K 6 5 PG VIN P1 FB PGND 1 2 R2 10K R1 4 CIN 10F PVIN U1 SW FAN2013 3 L 2.2H COUT 40 - 60F VOUT Figure 1. Typical Application Ordering Information Part Number FAN2013MPX Output Voltage 0.8V to VIN-1V Package 3x3mm 6-Lead Molded Leadless Package (MLP) Packing Method Tape and Reel All packages are lead free per JEDEC: J-STD-020B standard. (c) 2006 Fairchild Semiconductor Corporation FAN2013 Rev. 1.0.3 www.fairchildsemi.com FAN2013 -- 2A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Pin Assignments FB PGND SW 1 2 6 PG VIN PVIN P1 (AGND) 5 3 4 Figure 2. Pin Assignments (Top View) Pin Definitions Pin # P1 1 2 3 4 5 6 Name AGND FB PGND SW PVIN VIN PG Description Analog Ground. P1 must be soldered to the PCB ground. 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. Supply Voltage Input. Open Drain Power Good. (c) 2006 Fairchild Semiconductor Corporation FAN2013 Rev. 1.0.3 www.fairchildsemi.com 2 FAN2013 -- 2A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Absolute Maximum Ratings 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 JC TL TSTG TJ ESD Supply Voltage Parameter Input Voltage on PVIN and Any Other Pin Thermal Resistance, Junction-to-Tab Storage Temperature Junction Temperature Electrostatic Discharge Protection Level (2) (1) Min. -0.3 -0.3 Max. 6.2 VIN 8 260 Unit V V C/W C C C kV Lead Soldering Temperature (10 Seconds) -65 -40 HBM CDM 3.5 2 150 150 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 VOUT IOUT L CIN COUT TA Parameter Supply Voltage Range Output Voltage Range, Adjustable Version Output Current Inductor (3) (3) (3) Min. 4.5 0.8 Typ. Max. 5.5 VIN-1 2.0 Unit V V A H F F 2.2 10 20 -40 20 40 +85 Input Capacitor Output Capacitor Operating Ambient Temperature Range C Note: 3. Refer to the Applications section for details. (c) 2006 Fairchild Semiconductor Corporation FAN2013 Rev. 1.0.3 www.fairchildsemi.com 3 FAN2013 -- 2A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Electrical Characteristics VIN = 4.5V to 5.5V, VOUT = 1.2V, IOUT = 200mA, CIN = 10F, COUT = 40F, L = 2.2H, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = 25C. Symbol VIN IQ VUVLO RON_PMOS RON_NMOS ILIMIT TOVP fSW RLINE RLOAD VOUT Parameter Input Voltage Quiescent Current UVLO Threshold PMOS On Resistance NMOS On Resistance P-Channel Current Limit Over-Temperature Protection Switching Frequency Line Regulation Load Regulation Output Voltage During Load (4) Transition Reverse Leakage Current into Pin SW Reference Voltage IOUT = 0mA VIN Rising Hysteresis Conditions Min. 4.5 Typ. 10 Max. 5.5 16 4.0 Units V mA V mV M m 3.4 3.7 150 90 90 VIN = VGS = 5V VIN = VGS = 5V 4.5V < VIN < 5.5V Rising Temperature Hysteresis 1000 VIN = 4.5 to 5.5V, IOUT = 100mA 0mA IOUT 2000mA IOUT from 1500mA to 100mA, COUT = 60F IOUT from 100mA to 1500mA, COUT = 60F VIN = Open, EN = GND, VSW = 5.5V -5 2.8 3.5 150 20 1300 0.16 0.2 4.2 A C C 1600 0.6 5 kHz %/V % % % ILEAK VREF 0.1 0.8 1.0 A V VOUT Output Voltage Accuracy VIN = 4.5 to 5.5V, 0mA IOUT 2000mA, TA= 0C to +85C VIN = 4.5 to 5.5V, 0mA IOUT 2000mA, TA= -40C to +85C FB Voltage Rising Hysteresis Isink=6mA, Open-Drain Output FB Voltage Rising Hysteresis -2 -3 0.85 xVOUT 2 100 2 3 % % % V s VPG tPG VPG_LOW VOVP Power Good Output Threshold and Hysteresis Power Good Output Delay Power Good Voltage Low Over-Voltage Protection Threshold and Hysteresis 0.4 1.07 xVOUT 2 V V % Notes: 4. Please refer to the load transient response test waveform shown in Figure 3. ILOAD (mA) 1500 tr = 100ns ss tf = 100ns 100 0 Figure 3. ss 0.6 ss ss 4.6 Time (ms) Load Transient Response Test Waveform (c) 2006 Fairchild Semiconductor Corporation FAN2013 Rev. 1.0.3 www.fairchildsemi.com 4 FAN2013 -- 2A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Typical Performance Characteristics TA = 25C, CIN = 10F, COUT = 40F, L = 2.2H, VIN = 5V, VOUT = 1.2V, unless otherwise noted. Figure 4. Start-up with 100mA Resistive Load Figure 5. Start-up with 2A Resistive Load Figure 6. Load Transient Response 1.5A to 100mA Figure 7. Load Transient Response 100mA to 1.5A Figure 8. Output Voltage Regulation Figure 9. Power Efficiency www.fairchildsemi.com (c) 2006 Fairchild Semiconductor Corporation FAN2013 Rev. 1.0.3 5 FAN2013 -- 2A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Block Diagram PG VIN PVIN REF FB PG COMP UNDER VOLTAGE LOCKOUT IS CURRENT SENSE GND DIGITAL SOFT START FB ERROR AMP 0.8V COMP LOGIC CONTROL MOSFET DRIVER SW GND IS OVER VOLTAGE COMP OSC SLOPE COMPENSATION REF FB GND Figure 10. Block Diagram Detailed Operation Description The FAN2013 is a step-down pulse-width modulated (PWM) current mode converter with a fixed switching frequency of 1.3MHz. At the rising edge of each clock cycle, the P-channel transistor is turned on until the PWM comparator trips or the current limit is reached. During the ON time, the inductor current ramps up and is monitored by the internal current-mode control loop. After a minimum dead time, the N-channel transistor is turned ON and the inductor current ramps down. As the clock cycle is completed, the N-channel switch is turned OFF and the next clock cycle starts. The duty cycle is given by the ratio of output voltage and input voltage. The converter runs at minimum duty cycle when output voltage is at minimum and input voltage is at maximum, and at 100% duty cycle when the input voltage approaches the output voltage, as described below. The FAN2013 has an internal soft-start circuit that limits the inrush current during start-up. This prevents 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 (3.5A). Typical start-up time for a 40F output capacitor with a load current of 2.0A is 800s. Output Over-Voltage Protection When output voltage, VOUT, reaches approximately 7% above the nominal value, the device turns OFF the Pchannel switch and turns ON part of the N-channel transistor with a built-in current limit of about 400mA. When VOUT reaches the hysteresis of about 2%, the device starts switching normally in closed loop. If output voltage is pulled up by an external voltage source with a current limit higher than typical 400mA, the output voltage stays up at the external voltage source level. The over-voltage protection is designed to limit the output voltage excursion in case of a transient response from full load to a minimum load. 100% Duty Cycle Operation As the input voltage approaches the output voltage and the duty cycle exceeds the typical 95%, the converter turns the P-channel transistor continuously on. In this mode, the output voltage is equal to the input voltage, minus the voltage drop across the P-channel transistor: VOUT = VIN - ILOAD x (RDS_ON + RL) where RDS_ON = P-channel switch on resistance ILOAD = Output current RL = Inductor DC resistance (1) Output Short-Circuit Protection The switch peak current is limited cycle by cycle to a typical value of 3.5A. In the event of an output voltage short circuit, the device operates with a frequency of 400kHz and minimum duty cycle, making the average typical input current .45A. UVLO and Soft Start The internal voltage reference, VREF, and the IC remain reset until VIN reaches the 3.7V UVLO threshold. Thermal Shutdown When the die temperature exceeds 150C, a reset occurs and remains in effect until the die cools to 130C, when the circuit is allowed to restart. www.fairchildsemi.com 6 (c) 2006 Fairchild Semiconductor Corporation FAN2013 Rev. 1.0.3 FAN2013 -- 2A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Applications Information Setting the Output Voltage The internal voltage reference is 0.8V. The output is divided down by a voltage divider, R1 and R2 to the FB pin. The output voltage is: V O UT PCB Layout Recommendations 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. Note that the peak amplitude of the switching spikes depends upon the load current; the higher the load current, the higher the switching spikes. 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 11. =V REF R1 1 + - ---R 2 (2) According to this equation, assuming desired output voltage of 1.2V, and given R2 = 10K as the recommended resistance for any output voltage setting, the calculated value of R1 is 5K. Inductor Selection The inductor parameters directly related to device performance are saturation current and DC resistance. The FAN2013 operates with a typical inductor value of 2.2H. 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 by: 1 - ( VO U T VIN) IL = VO U T x - -- -- -- -- -- -- -- -- -- --- -- --- -- -- -- -- -- -- -- Lxf (3) where: IL = Inductor Ripple Current f = Switching Frequency L = Inductor Value Recommended inductors are listed in Table1. Table 1. Recommended Inductors Inductor Vendor Value 2.2H 2.2H Coiltronics Murata Part Number SD25 2R2 LQH66SSN2R2M03 Figure 11. Recommended PCB Layout Capacitors Selection For best performances, a low-ESR input capacitor is required. A ceramic capacitor of at least 10F, placed as close to the VIN and AGND pins as possible is recommended. The output capacitor determines the output ripple and the transient response. A minimum of 20F output capacitor is required for the FAN2013 to operate in stable conditions. Table 2. Recommended Capacitors Capacitor Value Vendor Taiyo Yuden 10F TDK Murata Part Number JMK212BJ106MG JMK316BJ106KL C2012X5ROJ106K C3216X5ROJ106M GRM32ER61C106K (c) 2006 Fairchild Semiconductor Corporation FAN2013 Rev. 1.0.3 www.fairchildsemi.com 7 FAN2013 -- 2A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Physical Dimensions Figure 12. 3x3mm 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/packaging/ (c) 2006 Fairchild Semiconductor Corporation FAN2013 Rev. 1.0.3 www.fairchildsemi.com 8 FAN2013 -- 2A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator (c) 2006 Fairchild Semiconductor Corporation FAN2013 Rev. 1.0.3 www.fairchildsemi.com 9 |
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