FAN4603 600mA, Fully Integrated, Buck Power Supply Module Features Description Solder and Play DC/DC Converter; No External Components Required Up to 91% Efficiency The FAN4603 is a fully integrated synchronous DC/DC buck converter that provides up to 600mA of output current over an input voltage ranging from 2.3V to 5.5V. It provides a fixed output voltage level ranging from 1.0V to 1.8V. Other voltage options are available on request. 4.0 x 2.5mm MLP Package 600mA Output Current Capability The FAN4603 converter is offered as an ultra-miniature “Solder and Play” solution that requires no external components and is able to achieve a DC accuracy of ±2% PWM and an output ripple less than 12mV. 2.3V to 5.5V Input Voltage Range Fixed Output Voltages from 1.0V to 1.8V 35µA PFM Quiescent Current Best-in-Class Load and Line Transient Response ±2% PWM DC Voltage Accuracy No External Components Required High-Efficiency, Low-Ripple, Light-Load PFM Thermal Shutdown (TSD), Under-Voltage Lockout, (UVLO), and Short-Circuit (SCP) Protection Total footprint is 4.0 x 2.5mm with a maximum height of 1.1mm. It can be used in small battery-powered devices and applications with distributed DC POL requirements. At moderate and light loads, pulse frequency modulation is used to operate the device in power-save mode with a typical quiescent current of 35µA. Even with such a low quiescent current, the part exhibits excellent transient response during large load swings. At higher loads, the system automatically switches to fixed-frequency control. In shutdown mode, the supply current drops below 2µA, reducing power consumption. Maximum Height: 1.1mm Applications POL and Distributed DC-DC Module Applications Wireless Cards, Meters, Hearing Aids, Bluetooth Headsets, POS Equipment, VOIP, PDAs, MIDs, Netbooks, and Servers Small Form Factor, Battery-Powered Applications POL Core Power for FPGA, DSP, CPU, and GPU with Fast-Transient, Wide Dynamic Load Requirements Ordering Information Part Number (1) Output Voltage FAN4603MM18X 1.82V FAN4603MM15X 1.5V FAN4603MM13X 1.3V FAN4603MM12X 1.23V FAN4603MM10X 1.0V Package Temperature Range Packing 6-Lead Molded Leadless Package (MLP), 4 x 2.5 x 1mm –40 to 85°C Tape and Reel Note: 1. Other voltage options are available on request. Contact a Fairchild representative. © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 www.fairchildsemi.com FAN4603 — 600mA, Fully Integrated Buck Power Supply Module August 2010 FAN4603 — 600mA, Fully Integrated Buck Power Supply Module Typical Application Figure 1. Typical Application Pin Configuration Figure 2. MLP 4.0 x 2.5 mm (Top View) Figure 3. 3D Package View Pin Definitions Pin # Name Description 1 VIN Input Voltage. Connect to input power source 2 EN Enable. The device is in shutdown mode when voltage to this pin is <0.4V and enabled when >1.2V. Do not leave this pin floating. 3 SW Switching Node. Leave this pin floating. 4 VOUT 5 FB 6 GND Ground. Power and IC ground. All signals are referenced to this pin. P1 GND Optional Ground Connection. Not typically used. Output Voltage. Connect to Load. Feedback/VOUT. This pin must be shorted directly to VOUT (Pin 4). © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 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 Min. Max. Units Input Voltage with Respect to GND -0.3 6.0 V Voltage on Any Other Pin with Respect to GND -0.3 VIN V TJ Junction Temperature -40 +150 °C TSTG Storage Temperature -65 +150 °C +260 °C VIN TL ESD Parameter Lead Temperature (Soldering, 10 Seconds) Electrostatic Discharge Capability Human Body Model JESD22-A114 6 Charged Device Model, JESD22-C101 2 kV 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 Parameter VCC Supply Voltage Range IOUT Output Current Min. Max. Units 2.3 5.5 V 0 600 mA TA Operating Ambient Temperature -40 +85 °C TJ Operating Junction Temperature -40 +125 °C Thermal Properties Symbol ΘJA Parameter Junction-to-Ambient Thermal Resistance (2) Typical Units 120 °C/W Note: 2. Junction-to-ambient thermal resistance is a function of application and board layout. This data is measured with a twolayer 2s0p board in accordance to the JESD51- JEDEC standard. Special attention must be paid not to exceed junction temperature TJ(max) at a given ambient temperature TA. © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 www.fairchildsemi.com 3 FAN4603 — 600mA, Fully Integrated Buck Power Supply Module Absolute Maximum Ratings Unless otherwise noted, VIN = 2.5 to 5.5V, EN = VIN. TA = -40°C to +85°C, using circuit of Figure 1. Typical values are at 3.6VIN, TA = 25°C. Symbol Parameter Conditions Min. Typ. Max. Units 35 55 µA Power Supplies IQ Quiescent Current ISD Shutdown Supply Current VIN = 3.6V, EN = GND 0.1 2.0 µA VUVLO Under-Voltage Lockout Threshold Rising VIN 2.15 2.25 V VUVHYST Under-Voltage Lockout Hysteresis VENH Enable HIGH-Level Input Voltage VENL Enable LOW-Level Input Voltage 150 mV 1.05 V 0.4 VEN_HYS Enable Logic Input Hysteresis 100 IEN Enable Input Leakage Current EN = VIN or GND Oscillator Frequency(3) PWM Mode V mV 0.01 1.00 µA 5.4 6.0 6.6 MHz ILOAD = 0 to 600mA 1.784 1.820 1.890 PWM Mode 1.784 1.820 1.856 ILOAD = 0 to 600mA 1.470 1.500 1.560 PWM Mode 1.470 1.500 1.530 ILOAD = 0 to 600mA 1.274 1.300 1.352 PWM Mode 1.274 1.300 1.326 ILOAD = 0 to 600mA 1.207 1.233 1.283 PWM Mode 1.207 1.233 1.260 ILOAD = 0 to 600mA 0.975 1.000 1.050 PWM Mode 0.975 1.000 1.025 180 300 µs 1050 1250 mA Oscillator fOSC Regulation 1.82V 1.50V VO Output Voltage Accuracy 1.30V 1.23V 1.00V tSS Soft-Start Time Rising EN to VOUT Regulation V Protection ILIM Peak Input Current Limit 850 TTSD Thermal Shutdown +150 °C THYS Thermal Shutdown Hysteresis +15 °C Note: 3. PWM frequency may be lower than specified when limited by tON-min (minimum on-time) or tOFF_min (minimum off-time), at duty cycle extremes, but output regulation is maintained. © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 www.fairchildsemi.com 4 FAN4603 — 600mA, Fully Integrated Buck Power Supply Module Electrical Specifications Unless otherwise specified, VIN = 3.7V, TA = 25°C,VIN = VEN 100% 100% 1.82VOUT VIN=3.7V 1.5VOUT 90% 90% VIN=5V 1.3VOUT 70% Efficiency Efficiency 1.23VOUT 80% 1.82VOUT 1.0VOUT 80% 70% 1.5VOUT 1.3VOUT 60% 1.23VOUT 60% 1.0VOUT 50% 1 10 100 50% 1000 1 10 Output Current (mA) Figure 4. Efficiency, VIN=3.7V 100% 100% 90% 90% 80% 70% 2.5VIN 80% 70% 3.3VIN, -40C 3.3VIN 3.3VIN, +85C 3.7VIN 60% 60% 5.0VIN, -40C 5.0VIN 5.0VIN, +85C 50% 50% 1 10 100 1 1000 10 100 1000 Output Current (mA) Output Current (mA) Figure 6. 1.82VOUT Efficiency Figure 7. 1.82 VOUT Efficiency Over Temperature 40 75 2.5VIN 3.3VIN 5VIN 5.0Vin, 2.2uF 30 Output Ripple (mVp-p) 2.5VIN Vout Error (mV) 1000 Figure 5. Efficiency, VIN=5V Efficiency Efficiency 100 Output Current (mA) 3.3VIN 3.7VIN 20 5.0VIN 10 60 45 30 15 0 0 0 100 200 300 400 500 600 -10 0 100 200 300 400 500 600 Load Current (mA) Output Current (mA) Figure 9. 1.82VOUT Output Ripple with Optional 2.2µF COUT (1.5µF Actual) Figure 8. 1.82VOUT Regulation (Normalized) © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 www.fairchildsemi.com 5 FAN4603 — 600mA, Fully Integrated Buck Power Supply Module Typical Performance Unless otherwise specified, VIN = 3.7V, TA = 25°C,VIN = VEN 40 100% 3.3VIN 3.3VIN, 2.2uF 30 90% 5.0VIN, 2.2uF 20 Efficiency Vout Error (mV) 5.0VIN 10 80% 70% 2.5VIN 3.3VIN 0 60% -10 50% 3.7VIN 5.0VIN 0 100 200 300 400 500 600 1 10 Output Current (mA) Figure 10. 1.82VOUT Regulation (Normalized) with Optional 2.2µF COUT (1.5µF Actual) 1000 Figure 11. 1.23 VOUT Efficiency 20 100% 2.5VIN 15 90% 3.3VIN Vout Error (mV) Efficiency 100 Output Current (mA) 80% 70% 3.3VIN, -40C 3.7VIN 10 5.0VIN 5 0 3.3VIN, +85C 60% 5.0VIN, -40C -5 5.0VIN, +85C -10 50% 1 10 100 0 1000 100 1.23VOUT Efficiency Over Temperature Figure 14. Figure 13. 1.82VOUT PFM / PWM Boundary © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 300 400 500 600 Output Current (mA) Output Current (mA) Figure 12. 200 Figure 15. 1.23VOUT Regulation (Normalized) 1.23VOUT PFM / PWM Boundary www.fairchildsemi.com 6 FAN4603 — 600mA, Fully Integrated Buck Power Supply Module Typical Performance Unless otherwise specified, VIN = 3.7V, TA = 25°C,VIN = VEN Figure 16. Quiescent Current Over Temperature (EN=VIN) Figure 17. Figure 18. 1.82VOUT Startup, 3.7VIN, No Load Figure 19. Figure 21. Figure 20. 1.82VOUT Startup into Pre-Charged Output, 3.7VIN, 300mA Load © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 Shutdown Current Over Temperature (EN=0V) 1.82VOUT Startup, 3.7VIN, 3.6Ω Load Over-Current Protection, 300mA Load Transition to 300mΩ Fault www.fairchildsemi.com 7 FAN4603 — 600mA, Fully Integrated Buck Power Supply Module Typical Performance Unless otherwise specified, VIN = 3.7V, TA = 25°C,VIN = VEN 1.82VOUT Load Transient, 10-160mA, tR/tF=100ns Figure 23. 1.82VOUT Load Transient, 150-500mA, tR/tF=100ns Figure 24. 1.82VOUT Load Transient, 10-160mA, tR/tF=100ns with Optional 2.2µF COUT Figure 25. 1.82VOUT Load Transient, 150-500mA, tR/tF=100ns with Optional 2.2µF COUT Figure 26. 1.82VOUT Line Transient, 3.6-4.2VIN, tR/tF=10µs, with 10mA Load Figure 27. 1.82VOUT Line Transient, 3.6-4.2VIN, tR/tF=10µs, with 300mA Load Figure 22. © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 www.fairchildsemi.com 8 FAN4603 — 600mA, Fully Integrated Buck Power Supply Module Typical Performance The FAN4603 is a 600mA, step-down, switching-voltage regulator that delivers a fixed output from an input voltage supply of 2.3V to 5.5V. Using a proprietary architecture with synchronous rectification, the FAN4603 is capable of delivering a peak efficiency of >90%, while maintaining efficiency over 80% at load currents as low as 1mA. The regulator operates at a nominal PWM frequency of 6MHz. To prevent shutdown during soft-start, the following condition must be met: where IMAX(DC) is the maximum load current the IC is guaranteed to support (600mA). Table 1 shows combinations of external COUT that allow the IC to start successfully with the minimum RLOAD that can be supported at each. Control Scheme The FAN4603 uses a proprietary, non-linear, fixed-frequency PWM modulator to deliver a fast load transient response, while maintaining a constant switching frequency over a wide range of operating conditions. Regulator stability is not dependent on output capacitor ESR, which allows the use of ceramic capacitors. Although this type of operation normally results in a switching frequency that varies with input voltage and load current, an internal frequency loop holds the switching frequency constant over a large range of input voltages and load currents. Table 1. Minimum RLOAD Values for Soft-Start with Various External COUT Values For very light loads, FAN4603 incorporates a discontinuous current (DCM) single-pulse PFM mode, which produces lower output ripple when compared with other PFM architectures. Transition between PWM and PFM is seamless, with a glitch of less than 20mV at VOUT during the transition between DCM and CCM modes. VOUT / 0.55 4.7μF, 0402 VOUT / 0.50 10μF, 0603 VOUT / 0.45 If the fault is caused by short circuit, the soft-start circuit attempts to restart and produces an over-current fault after about 32μs, which results in a duty cycle of less than 30%, limiting power dissipation. PWM mode operation is prohibited during the soft-start cycle to prevent COUT from being discharged. This allows glitchless starting into a pre-charged output. Under-Voltage Lockout (UVLO) Startup into Large COUT When EN is HIGH, the under-voltage lockout keeps the part from operating until the input supply voltage rises high enough to properly operate. This ensures no misbehavior of the regulator during startup or shutdown. The IC may fail to start if heavy load is applied during startup and a large external COUT is present. This is due to the current-limit fault response, which protects the IC in an overcurrent condition during soft-start. Thermal Shutdown The current required to charge COUT during soft-start, referred to as “displacement current,” is given as: When the die temperature increases, due to a high load condition and/or a high ambient temperature, the output switching is disabled until the temperature on the die has fallen sufficiently. The junction temperature at which the thermal shutdown activates is nominally 150°C with 15°C hysteresis. After cooling, the IC automatically restarts, with a soft-start cycle. (1) dV refers to the soft-start slew rate. dt © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 2.2μF, 0402 A heavy load or short circuit on the output causes the current to increase until a maximum current threshold is reached. Upon reaching this point, the high-side switch turns off, preventing high currents from causing damage. The regulator continues to limit the current cycle-by-cycle. After 21µs of current limit, the regulator triggers an over-current fault, causing the regulator to shut down for about 85μs before attempting an automatic restart. When EN is LOW, all circuits in FAN4603 are off and the IC draws ~100nA of current. When EN is HIGH and VIN is above its UVLO threshold, the regulator begins a soft-start cycle. The output ramp during soft-start is a fixed slew rate of 50mV/μs from 0 to 1 VOUT, then 12.5mV/μs until the output reaches its setpoint. where Minimum RLOAD Current Limit, Fault Shutdown, and Restart Enable and Soft-Start dV dt COUT Multiple soft-start cycles may be required for COUT>10μf (15μf with no load). The IC shuts down for 85μs when IDISP+ ILOAD exceeds ILIMIT for more than 21μs of current limit. The IC then begins a new soft-start cycle. Subsequent soft-start cycles begin with any charge retained by COUT while the IC is off, allowing VOUT to incrementally reach regulation over multiple soft-start attempts. Combined with exceptional transient response characteristics, the very low quiescent current of the controller (35µA) maintains high efficiency; even at very light loads, while preserving fast transient response for applications requiring tight output regulation. IDISP = C OUT • (2) IDISP + ILOAD < IMAX(DC) www.fairchildsemi.com 9 FAN4603 — 600mA, Fully Integrated Buck Power Supply Module Operation Description PCB Layout Guideline PFM output ripple amplitude can be reduced by adding external COUT, with negligible impact on efficiency. Reduced output ripple also results in less DC voltage excursion at very light loads. Maximum PFM ripple occurs at no load and is VIN and VOUT proportional. Figure 29. Recommended PCB Layout Figure 28. Typical 1.82VOUT No Load PFM Ripple vs. VIN FB (pin 5) must be directly connected to VOUT (pin 4). Note: 4. Ripple is less for lower VOUT levels. Figure 29 shows the recommended locations of optional CIN and COUT, shown as 0603 size devices. Pad P1, shown in Figure 30 “Land Pattern,” is an optional GND pin. Connection is not required on the PCB. The effective value of external COUT for a desired ripple amplitude can be determined using: ⎛ ( V − VOUT ) • VOUT • 62 ⎞ ⎟ −1 C OUT. (μF) = ⎜⎜ IN ⎟ VIN • VR ⎝ ⎠ (3) where VR is the desired output ripple amplitude in mV and VIN and VOUT are in Volts. The simplified equation above is representative of nominal component values and does not account for device tolerances. The bias level effects associated with case size, voltage rating, and dielectric type of ceramic capacitors should be considered when selecting COUT. Minimum Off-Time Effect on Switching Frequency tOFF(MIN) is 50ns, while tON(MIN) is 35nS This imposes V constraints on the maximum/minimum OUT that the VIN FAN4603 can provide while maintaining a fixed switching frequency in PWM mode. When VIN is LOW, fixed switching is maintained as long as VOUT ≤ 1 − tOFF ( MIN ) • fSW ≈ 0.7 . VIN When VIN is HIGH, fixed switching is maintained as long as VOUT ≥ t ON ( MIN ) • f SW ≈ 0.2 V IN The switching frequency drops when the regulator cannot provide sufficient duty cycle at 6MHz to maintain regulation. Lowering the switching frequency allows VOUT to remain in regulation, even at very low or very high duty cycle. © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 www.fairchildsemi.com 10 FAN4603 — 600mA, Fully Integrated Buck Power Supply Module Reducing PFM Output Ripple C L P1 A 0.05 A 2X 0.25 0.95 0.95 2.50 B 0.13 0.32 0.50 1 PIN A1 MARK 6 6 1 3.70 0.78 CL 4.00 3 1.10 4 2X 1.10 0.90 1.45 0.08 C SEATING PLANE 1.20 CL 0.50 0.30 1.25 1.15 P1 3 4 C NOTES: A) THIS PACKAGE IS NOT PRESENTLY REGISTERED WITH ANY STANDARDS COMMITTEE. B) DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS ARE INCLUSIVE OF BURRS, MOLD FLASH, AND TIE BAR PROTRUSIONS. D) DRAWING CONFORMS TO ASME Y14.5M-1994 E) DRAWING FILENAME: MKT-MOD06AArev3 2.50 CL 0.63 LAND PATTERN RECOMMENDATION 0.10 C 0.85 0.65 0.30 0.80 2.70 TOP VIEW 0.05 0.00 0.50 3 4 CL 0.10 C L 0.40 1.30 0.05 B 1.45 1.45 1.35 0.68 5 0.48 2 6 1 0.40 0.15 4.00 (0.40) PIN A1 MARK 0.23 (0.25) BOTTOM VIEW Figure 30. 6-Lead, MicroModule QFN 2.5 x 4 x 1mm 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/. © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 www.fairchildsemi.com 11 FAN4603 — 600mA, Fully Integrated Buck Power Supply Module Physical Dimensions FAN4603 — 600mA, Fully Integrated Buck Power Supply Module © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 www.fairchildsemi.com 12