FAN4603

FAN4603 — 600mA, Fully Integrated Buck Power Supply Module August 2010 FAN4603 600mA, Fully Integrated, Buck Power Supply Module Features Solder and Play DC/DC Converter; No External Components Required Up to 91% Efficiency 600mA Output Current Capability 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 4.0 x 2.5mm MLP Package Maximum Height: 1.1mm Description 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. 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. 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. Applications POL and Distributed DC-DC Module Applications Small Form Factor, Battery-Powered Applications POL Core Power for FPGA, DSP, CPU, and GPU with Fast-Transient, Wide Dynamic Load Requirements Wireless Cards, Meters, Hearing Aids, Bluetooth Headsets, POS Equipment, VOIP, PDAs, MIDs, Netbooks, and Servers Ordering Information Part Number FAN4603MM18X FAN4603MM15X FAN4603MM13X FAN4603MM12X FAN4603MM10X Output Voltage 1.82V 1.5V 1.3V 1.23V 1.0V (1) 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 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 # 1 2 3 4 5 6 P1 Name VIN EN SW VOUT FB GND GND Description Input Voltage. Connect to input power source Enable. The device is in shutdown mode when voltage to this pin is 1.2V. Do not leave this pin floating. Switching Node. Leave this pin floating. Output Voltage. Connect to Load. Feedback/VOUT. This pin must be shorted directly to VOUT (Pin 4). Ground. Power and IC ground. All signals are referenced to this pin. Optional Ground Connection. Not typically used. © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 www.fairchildsemi.com 2 FAN4603 — 600mA, Fully Integrated Buck Power Supply Module 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 TJ TSTG TL ESD Parameter Input Voltage with Respect to GND Voltage on Any Other Pin with Respect to GND Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 Seconds) Electrostatic Discharge Capability Human Body Model JESD22-A114 Charged Device Model, JESD22-C101 Min. -0.3 -0.3 -40 -65 6 2 Max. 6.0 VIN +150 +150 +260 Units V V °C °C °C 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 VCC IOUT TA TJ Supply Voltage Range Output Current Parameter Min. 2.3 0 -40 -40 Max. 5.5 600 +85 +125 Units V mA °C °C Operating Ambient Temperature Operating Junction Temperature Thermal Properties Symbol ΘJA Parameter Junction-to-Ambient Thermal Resistance (2) Typical 120 Units °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 Electrical Specifications 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 Power Supplies IQ ISD VUVLO VUVHYST VENH VENL VEN_HYS IEN Oscillator fOSC Regulation Parameter Quiescent Current Shutdown Supply Current Under-Voltage Lockout Threshold Under-Voltage Lockout Hysteresis Enable HIGH-Level Input Voltage Enable LOW-Level Input Voltage Enable Logic Input Hysteresis Enable Input Leakage Current Conditions Min. Typ. 35 Max. 55 2.0 2.25 Units µA µA V mV V VIN = 3.6V, EN = GND Rising VIN 0.1 2.15 150 1.05 0.4 100 EN = VIN or GND 0.01 1.00 V mV µA Oscillator Frequency(3) PWM Mode 5.4 6.0 6.6 MHz 1.82V ILOAD = 0 to 600mA PWM Mode ILOAD = 0 to 600mA PWM Mode ILOAD = 0 to 600mA PWM Mode ILOAD = 0 to 600mA PWM Mode ILOAD = 0 to 600mA PWM Mode Rising EN to VOUT Regulation 1.784 1.784 1.470 1.470 1.274 1.274 1.207 1.207 0.975 0.975 1.820 1.820 1.500 1.500 1.300 1.300 1.233 1.233 1.000 1.000 180 1.890 1.856 1.560 1.530 1.352 1.326 1.283 1.260 1.050 1.025 300 µs V 1.50V VO Output Voltage Accuracy 1.30V 1.23V 1.00V tSS Protection ILIM TTSD THYS Peak Input Current Limit Thermal Shutdown Thermal Shutdown Hysteresis Soft-Start Time 850 1050 +150 +15 1250 mA °C °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 Typical Performance Unless otherwise specified, VIN = 3.7V, TA = 25°C,VIN = VEN 100% VIN=3.7V 90% 100% 1.82VOUT 1.5VOUT 90% VIN=5V 1.3VOUT 1.23VOUT Efficiency Efficiency 80% 80% 1.0VOUT 70% 1.82VOUT 1.5VOUT 1.3VOUT 70% 60% 1.23VOUT 1.0VOUT 60% 50% 1 10 100 1000 50% 1 10 100 1000 Output Current (mA) Output Current (mA) Figure 4. Efficiency, VIN=3.7V 100% 100% Figure 5. Efficiency, VIN=5V 90% 90% Efficiency Efficiency 80% 80% 70% 2.5VIN 3.3VIN 70% 3.3VIN, -40C 3.3VIN, +85C 60% 3.7VIN 5.0VIN 60% 5.0VIN, -40C 5.0VIN, +85C 50% 1 10 100 1000 50% 1 10 100 1000 Output Current (mA) Output Current (mA) Figure 6. 1.82VOUT Efficiency 40 Figure 7. 1.82 VOUT Efficiency Over Temperature 75 2.5VIN Output Ripple (mVp-p) 30 3.3VIN 3.7VIN 60 2.5VIN 3.3VIN 5VIN 5.0Vin, 2.2uF Vout Error (mV) 20 5.0VIN 45 30 10 15 0 0 0 -10 0 100 200 300 400 500 600 100 200 300 400 500 600 Load Current (mA) Output Current (mA) Figure 8. 1.82VOUT Regulation (Normalized) Figure 9. 1.82VOUT Output Ripple with Optional 2.2µF COUT (1.5µF Actual) © 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 30 3.3VIN, 2.2uF 5.0VIN 90% Vout Error (mV) Efficiency 20 5.0VIN, 2.2uF 80% 10 70% 2.5VIN 3.3VIN 0 60% 3.7VIN 5.0VIN -10 0 100 200 300 400 500 600 50% 1 10 100 1000 Output Current (mA) Output Current (mA) Figure 10. 1.82VOUT Regulation (Normalized) with Optional 2.2µF COUT (1.5µF Actual) 20 Figure 11. 1.23 VOUT Efficiency 100% 90% 15 2.5VIN 3.3VIN Vout Error (mV) 10 3.7VIN 5.0VIN Efficiency 80% 5 70% 3.3VIN, -40C 3.3VIN, +85C 0 60% 5.0VIN, -40C 5.0VIN, +85C -5 50% 1 10 100 1000 -10 0 100 200 300 400 500 600 Output Current (mA) Output Current (mA) Figure 12. 1.23VOUT Efficiency Over Temperature Figure 13. 1.23VOUT Regulation (Normalized) Figure 14. 1.82VOUT PFM / PWM Boundary Figure 15. 1.23VOUT PFM / PWM Boundary © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 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. Shutdown Current Over Temperature (EN=0V) Figure 18. 1.82VOUT Startup, 3.7VIN, No Load Figure 19. 1.82VOUT Startup, 3.7VIN, 3.6Ω Load Figure 20. 1.82VOUT Startup into Pre-Charged Output, 3.7VIN, 300mA Load Figure 21. Over-Current Protection, 300mA Load Transition to 300mΩ Fault © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 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 Figure 22. 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 © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 www.fairchildsemi.com 8 FAN4603 — 600mA, Fully Integrated Buck Power Supply Module Operation Description 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: IDISP + ILOAD < IMAX(DC) (2) 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. Table 1. Minimum RLOAD Values for Soft-Start with Various External COUT Values 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. 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. 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. COUT 2.2μF, 0402 4.7μF, 0402 10μF, 0603 Minimum RLOAD VOUT / 0.55 VOUT / 0.50 VOUT / 0.45 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. Current Limit, Fault Shutdown, and Restart 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. 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. Enable and Soft-Start 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. 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) 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. Startup into Large COUT 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. The current required to charge COUT during soft-start, referred to as “displacement current,” is given as: IDISP = C OUT • dV dt Thermal Shutdown 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) where dV refers to the soft-start slew rate. dt © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 www.fairchildsemi.com 9 FAN4603 — 600mA, Fully Integrated Buck Power Supply Module Reducing PFM Output Ripple 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. PCB Layout Guideline Figure 29. Figure 28. Typical 1.82VOUT No Load PFM Ripple vs. VIN Note: 4. Ripple is less for lower VOUT levels. 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 ⎝ ⎠ Recommended PCB Layout FB (pin 5) must be directly connected to VOUT (pin 4). 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. (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 Physical Dimensions C L A P1 0.95 B 0.05 A 2X 2.50 0.13 0.50 0.25 0.95 0.32 6 PIN A1 MARK C L 1 6 3.70 4.00 1.10 1 1.45 0.10 C L 0.78 0.40 3 4 0.50 1.45 3 4 1.30 0.05 B 0.30 C L 2X 0.63 0.80 2.70 LAND PATTERN RECOMMENDATION 1.10 0.90 TOP VIEW 0.10 C 0.05 0.00 0.08 C SEATING PLANE C 2.50 0.85 0.65 C L P1 1.20 C L 3 4 1.45 1.35 0.50 0.30 1.25 1.15 0.68 5 0.48 2 1 6 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 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 © 2009 Fairchild Semiconductor Corporation FAN4603 • Rev. 1.0.1 www.fairchildsemi.com 12