Single Switch-Mode Power Supply

Freescale Semiconductor Advance Information Document Number: MC34713 Rev. 4.0, 5/2007 5.0 A 1.0 MHz Fully Integrated Single Switch-Mode Power Supply The 34713 is a highly integrated, space efficient, low cost, single synchronous buck switching regulator with integrated N-channel power MOSFETs. It is a high performance point-of-load (PoL) power supply with the ability to track an external reference voltage in different configurations. Its high efficient 5.0 A continuous output current capability combined with its voltage tracking/sequencing ability and tight output regulation, makes it ideal as a single power supply. The 34713 offers the designer the flexibility of many control, supervisory, and protection functions to allow for easy implementation of complex designs. It is housed in a Pb-Free, thermally enhanced, and space-efficient 24-Pin Exposed Pad QFN. Features • 45 mΩ Integrated N-Channel Power MOSFETs • Input Voltage Operating Range from 3.0 V to 6.0 V • ±1 % Accurate Output Voltage, Ranging from 0.7 V to 3.6 V • Voltage Tracking Capability in different configurations. • Programmable Switching Frequency Range from 200 kHz to 1.0 MHz with a default of 1.0 MHz • Programmable Soft Start Timing • Over Current Limit and Short Circuit Protection www.DataSheet4U.com • Thermal Shutdown • Output Overvoltage and Undervoltage Detection • Active Low Power Good Output Signal • Active Low Shutdown Input • Pb-Free Packaging Designated by Suffix Code EP. 34713 SWITCH-MODE POWER SUPPLY EP SUFFIX 98ARL10577D 24-PIN QFN ORDERING INFORMATION Device MC34713EP/R2 Temperature Range (TA) -40 to 85°C Package 24 QFN (3.0V TO 6.0V) VIN VMASTER VIN 34713 PVIN BOOT SW INV VOUT VREFIN PGND VDDI FREQ ILIM GND COMP VIN VOUT PG SD MICROCONTROLLER DSP, FPGA, ASIC Figure 1. 34713 Simplified Application Diagram * This document contains certain information on a new product. Specifications and information herein are subject to change without notice. © Freescale Semiconductor, Inc., 2007. All rights reserved. INTERNAL BLOCK DIAGRAM INTERNAL BLOCK DIAGRAM SD Thermal Monitoring PG M1 System Reset ILIMIT Discharge Oscillator FREQ Prog Frequency Buck Control Logic System Control Internal Voltage Regulator M2 VDDI VIN BOOT VIN VBOOT PVIN FSW Gate ISENSE Driver M3 SW ILIM Prog Soft Start ISENSE VDDI Current Monitoring ILIMIT PWM Comparator M4 PGND COMP VDDI Bandgap Regulator VBG Ramp Generator VREFIN VBG GND Reference Selection M5 Discharge VOUT Figure 2. 34713 Simplified Internal Block Diagram 34713 2 Analog Integrated Circuit Device Data Freescale Semiconductor – + – Error Amplifier + INV PIN CONNECTIONS PIN CONNECTIONS BOOT VDDI PVIN 20 24 GND FREQ ILIM PG NC SD 1 2 3 4 5 6 7 VREFIN 23 22 21 19 18 17 PVIN SW SW SW PGND PGND Transparent Top View PVIN 16 15 14 13 12 PGND VIN 8 NC VIN 9 COMP 10 INV 11 VOUT Figure 3. 34713 Pin Connections Table 1. 34713 Pin Definitions A functional description of each pin can be found in the Functional Pin Description section beginning on page 9. Pin Number 1 2 3 4 5, 8 6 7 9 10 11 12,13,14 15,16,17 18,19,20 21 22,23 24 Pin Name GND FREQ ILIM PG NC SD Pin Function Ground Passive Input Output None Input Input Passive Input Output Ground Power Supply Passive Supply Passive Formal Name Signal Ground Analog signal ground of IC Definition Frequency Adjustment Buck converter switching frequency adjustment pin Soft Start Power Good No Connect Shutdown Voltage-TrackingReference Input Compensation Error Amplifier Inverting Input Output Voltage Discharge FET Power Ground Switching Node Power-Circuit Supply Input Bootstrap Logic-Circuit Supply Input Internal Voltage Regulator Soft Start adjustment Active-low (open drain) power-good status reporting pin No internal connections to these pins. Recommend attaching a 0.1µF capacitor from pin 8 to GND. Shutdown mode input control pin Voltage-Tracking-Reference voltage input Buck converter external compensation network pin Buck converter error amplifier inverting input pin Discharge FET drain connection (connect to buck converter output capacitors) Ground return for buck converter and discharge FET Buck converter power switching node Buck converter main supply voltage input Bootstrap switching node (connect to bootstrap capacitor) Logic circuits supply voltage input Internal Vdd Regulator (connect filter capacitor to this pin) 34713 VREFIN COMP INV VOUT PGND SW PVIN BOOT VIN VDDI Analog Integrated Circuit Device Data Freescale Semiconductor 3 ELECTRICAL CHARACTERISTICS MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS MAXIMUM RATINGS Table 2. Maximum Ratings All voltages are with respect to ground unless otherwise noted. Exceeding these ratings may cause a malfunction or permanent damage to the device. Ratings ELECTRICAL RATINGS Input Supply Voltage (VIN) Pin High-Side MOSFET Drain Voltage (PVIN) Pin Switching Node (SW) Pin BOOT Pin (Referenced to SW Pin) PG, VOUT,and SD Pins VDDI, FREQ, ILIM, INV, COMP, and VREFIN Pins Continuous Output Current ESD Voltage (2) (1) Symbol Value Unit VIN PVIN VSW VBOOT - VSW IOUT -0.3 to 7.0 -0.3 to 7.0 -0.3 to 7.5 -0.3 to 7.5 -0.3 to 7.0 -0.3 to 3.0 +5.0 V V V V V V A Human Body Model Charge Device Model THERMAL RATINGS Operating Ambient Temperature (3) Storage Temperature Peak Package Reflow Temperature During Reflow Maximum Junction Temperature Power Dissipation (TA = 85 °C) (6) (4) (5) VESD1 VESD3 ±2000 ±750 V TA TSTG , TPPRT TJ(MAX) PD -40 to 85 -65 to +150 Note 5 +150 2.9 °C °C °C °C W Notes 1. Continuous output current capability so long as TJ is ≤ TJ(MAX). 2. 3. 4. 5. ESD1 testing is performed in accordance with the Human Body Model (CZAP = 100 pF, RZAP = 1500 Ω), ESD3 testing is performed in accordance with the Charge Device Model (CDM). The limiting factor is junction temperature, taking into account power dissipation, thermal resistance, and heatsinking. Pin soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may cause malfunction or permanent damage to the device. Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow Temperature and Moisture Sensitivity Levels (MSL), Go to www.freescale.com, search by part number [e.g. remove prefixes/suffixes and enter the core ID to view all orderable parts. (i.e. MC33xxxD enter 33xxx), and review parametrics. Maximum power dissipation at indicated ambient temperature 6. 34713 4 Analog Integrated Circuit Device Data Freescale Semiconductor ELECTRICAL CHARACTERISTICS MAXIMUM RATINGS Table 2. Maximum Ratings (continued) All voltages are with respect to ground unless otherwise noted. Exceeding these ratings may cause a malfunction or permanent damage to the device. Ratings THERMAL RESISTANCE (7) Thermal Resistance, Junction to Ambient, Single-Layer Board (1s) (8) Thermal Resistance, Junction to Ambient, Four-Layer Board (2s2p) (9) Thermal Resistance, Junction to Board (10) RθJA RθJMA RθJB 139 43 22 °C/W °C/W °C/W Symbol Value Unit Notes 7. The PVIN, SW, and PGND pins comprise the main heat conduction paths. 8. Per SEMI G38-87 and JEDEC JESD51-2 with the single-layer board (JESD51-3) horizontal. 9. Per JEDEC JESD51-6 with the board (JESD51-7) horizontal. There are no thermal vias connecting the package to the two planes in the board. 10. Thermal resistance between the device and the printed circuit board per JEDEC JESD51-8. Board temperature is measured on the top surface of the board near the package. 34713 Analog Integrated Circuit Device Data Freescale Semiconductor 5 ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 3. Static Electrical Characteristics Characteristics noted under conditions 3.0 V ≤ VIN ≤ 6.0 V, - 40°C ≤ TA ≤ 85°C, GND = 0 V unless otherwise noted. Typical values noted reflect the approximate parameter means at TA = 25°C under nominal conditions unless otherwise noted. Characteristic IC INPUT SUPPLY VOLTAGE (VIN) Input Supply Voltage Operating Range Input DC Supply Current (11) Symbol Min Typ Max Unit VIN IIN IINOFF 3.0 - - 6.0 25 V mA Normal Mode: SD = 1, Unloaded Outputs Input DC Supply Current (11) Shutdown Mode, SD = 0 INTERNAL SUPPLY VOLTAGE OUTPUT (VDDI) Internal Supply Voltage Range BUCK CONVERTER (PVIN, SW, PGND, BOOT, INV, COMP, ILIM) Output Voltage Adjustment Range (12), (13) Output Voltage Accuracy Line Regulation (12) (12), (14) - - 100 µA VDDI 2.35 2.5 2.65 V VOUT REGLN REGLD 0.7 -1.0 -1.0 - 3.6 1.0 1.0 V % % Normal Operation, VIN = 3.0 V to 6.0 V, IOUT = +5.0 A Load Regulation (12) Normal Operation, IOUT = 0.0 A to 5.0 A Error Amplifier Common Mode Voltage Range (12), (13) Output Undervoltage Threshold Output Overvoltage Threshold Continuous Output Current Over Current Limit Soft start Adjusting reference Voltage Range Short Circuit Current Limit High-Side N-CH Power MOSFET (M3) RDS(ON) IOUT = 1.0 A, VBOOT - VSW = 3.3 V Low-Side N-CH Power MOSFET (M4) RDS(ON) (12) IOUT = 1.0 A, VIN = 3.3 V Notes 11. 12. 13. 14. (12) -1.0 0.0 -1.5 1.5 1.25 10 6.5 8.5 - 1.0 1.35 -8.0 8.0 5.0 VDDI 45 % V % % A A V A mΩ VREF VUVR VOVR IOUT ILIM VILIM ISHORT RDS(ON)HS RDS(ON)LS 10 - 45 mΩ Section “MODES OF OPERATION”, page 12 has a detailed description of the different operating modes of the 34713 Design information only, this parameter is not production tested. The ±1% accuracy is only guaranteed for VEFOUT greater then or equal 0.7V at room tempreature. Overall output accuracy is directly affected by the accuracy of the external feedback network, 1% feedback resistors are recommended 34713 6 Analog Integrated Circuit Device Data Freescale Semiconductor ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 3. Static Electrical Characteristics Characteristics noted under conditions 3.0 V ≤ VIN