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Reference Guide SLVU343 – April 2010 Power Supply Reference Design for Freescale™i.MX35 Using TPS650250 This application report details the power supply requirements of the Freescale™ i.MX35 processor, and how to design with the TPS650250. 1 Features • • • • • • 2 TPS650250 highly integrated Power Management Unit 3.3V to 6.0V input voltage range Simple voltage scaling using external circuit Output Current Up to 1600mA Up to 97% Efficiency Small 5 mm x 5mm 32 pin QFN package Introduction This reference design applies for the Freescale™ i.MX35 processor family. It provides all required the analog and logic supply rails and the correct sequencing to power up a Freescale™ i.MX35 processor. 3 Requirements Table 1. Power Requirements of the Freescale™ i.MX35 Processor Pin Name I/O Core Voltage Imax [mA] MVDD, PVDD 1.5 20 QVCC (0 < fARM < 400MHz) 1.3 QVCC (0 < fARM < 532MHz) 1.4 400 Tolerance Sequencing Order Timing Delay n/a –6%, +10% 2 –6.2%, +13% 1 -5.4%, + 5% 1 n/a I/O NVCC_EMI1, NVCC_EMI2, NVCC_EMI_3, NVCC_LCDC, NVCC_NFC 1.8 / 3.3 90 –5%, +10% 1 n/a I/O NVCC_MISC, NVCC_SDIO, NVCC_CRM, NVCC_ATA, NVCC_MLB, NVCC_JTAG 1.8 / 3.3 60 ±5% 1 n/a I/O OSC24M_VDD, OSC_AUDIO_VDD, PHY1_VDDA, PHY2_VDD, USBPHY1_UPLLVDD, USBPHY1_VDDA_BIAS 3.3 25 ±9% 2 n/a FUSE_VDD (this rails is typ. Tied to GND, it is only needed if in system fuse burning is needed) 3.6 25 ±5% 2 n/a Fuse SLVU343 – April 2010 Submit Documentation Feedback Power Supply Reference Design for Freescale™i.MX35 Using TPS650250 Copyright © 2010, Texas Instruments Incorporated 1 Requirements www.ti.com Table 2. MCIMX35 Operating Ranges Symbol VDD Parameter Typ Max Unit Core operating voltage, 0 < fARM < 400 MHz 1.22 1.47 V Core operating voltage, 0 < fARM < 532 MHz 1.33 1.47 V State retention voltage (1) 1 V NVCC_EMI1,2,3 EMI 1.7 3.6 V NVCC_CRM WTDG, Timer, CCM, GPIO, CSPI1 1.75 3.6 V NVCC_NANDF NANDF 1.75 3.6 V NVCC_ATA ATA, USB generic 1.75 3.6 V NVCC_SDIO eSDHC1 1.75 3.6 V NVCC_CSI CSI, SDIO2 1.75 3.6 V NVCC_JTAG JTAG 1.75 3.6 V NVCC_LCDC LCDC, TTM, I2C1 1.75 3.6 V NVCC_MISC I2Xx2, ESAI, I2C2, UART2, UART1, FEC 1.75 3.6 V NVCC_MLB (2) MLB 1.75 3.6 V PHY1_VDDA USB OTG PHY 3.17 3.3 3.43 V USBPHY1_VDDA_BIAS USB OTG PHY 3.17 3.3 3.43 V USBPHY1_UPLLVDD USB OTG PHY 3.17 3.3 3.43 V PHY2_VDD USB HOST PHY 3.17 3.3 3.43 V OSC24M_VDD OSC24M 3.0 3.3 3.6 V OSC_AUDIO_VDD OSC_AUDIO 3.0 3.3 3.6 V MVDD MPLL 1.4 1.65 V PVDD PPLL 1.4 1.65 V FUSE_VDD (3) Fusebox program supply voltage 3.0 TA Operating ambient temperature range –20 (1) (2) (3) 3.1 Min 3.6 3.6 V 70 °C EMI I/O interface power supply should be set up according to external memory. For example, if using SDRAM then NVCC_EMI1,2,3 should all be set at 3.3 V (typ). If using MDDR or DDRe, NVC_EMI1,2,3 must be set at 1.8 V (typ). MLB interface I/O pads can be programmed to function as GPIO for the consumer and industrial parts by settling NVCC_MLB to 1.8 or 3.3 V. NVCC_MLB can be left floating. The Fusebox read supply is connected to supply the full speed USBPHY.FUSE_VDD is only used for programming. It is recommended that FUSE_VDD be connected to ground when not being used for programming. Power Up Sequencing The i.MX35 processor consists of four major sets of the power supply voltages: digital logic domains (VDDn), I/O power supplies (NVDDx), analog power supplies, and the fuse voltage supply (FUSEVDD). These voltage domains can be grouped together, depending on the operating mode and needs of the i.MX35 processor, and the specific application. Recommended power sequence for the processor is as shown below: 1. Assert POR (POR = Low) 2. Turn on the digital logic domain and I/O power supplies (VDDn, NVCCx) 3. Wait until VDDn, NVCCx power supplies are stable + 32 µs 4. Turn on all other power supplies 5. Negate the POR signal (POR = High) 3.2 Power Down Sequencing The power up sequence in reverse is recommended for power down, however all supplies can be shut down at the same time. 2 Power Supply Reference Design for Freescale™i.MX35 Using TPS650250 Copyright © 2010, Texas Instruments Incorporated SLVU343 – April 2010 Submit Documentation Feedback Powering Freescale™ i.MX35 using TPS650250 www.ti.com 4 Powering Freescale™ i.MX35 using TPS650250 The TPS650250 is an integrated Power Management IC for applications powered by one Li-Ion or Li-Polymer cell, which require multiple power rails. The TPS650250 provides three highly efficient, step-down converters targeted at providing the core voltage, peripheral, I/O and memory rails in a processor based system. All three step-down converters enter a low power mode at light load for maximum efficiency across the widest possible range of load currents. The functional block diagram of the TPS650250 is shown in Figure 1. SLVU343 – April 2010 Submit Documentation Feedback Power Supply Reference Design for Freescale™i.MX35 Using TPS650250 Copyright © 2010, Texas Instruments Incorporated 3 Powering Freescale™ i.MX35 using TPS650250 www.ti.com TPS650250 1R VCC Vbat 1 mF VINDCDC1 Vbat DCDC1 (I/O) 10 mF STEP-DOWN CONVERTER 1600 mA EN_DCDC1 ENABLE VINDCDC2 Vbat DCDC2 (memory) 10 mF STEP-DOWN CONVERTER 800 mA EN_DCDC2 ENABLE VINDCDC3 Vbat 3.3 V / 2.8 V or adjustable L1 2.2 mH VDCDC1 R1 22 mF DEFDCDC1 PGND1 R2 2.5 V / 1.8 V or adjustable L2 2.2 mH VDCDC2 R3 22 mF DEFDCDC2 PGND2 R4 L3 10 mF DCDC3 (core) 2.2 mH VDCDC3 DEFDCDC3 ENABLE STEP-DOWN CONVERTER 800 mA EN_DCDC3 PGND3 R5 22 mF R6 MODE PWM/ PFM VIN_LDO VIN VLDO1 200 mA LDO EN_LDO ENABLE VLDO1 FB_LDO1 R7 2.2 mF R8 VLDO2 200 mA LDO VLDO2 FB_LDO2 R9 R10 EN_Vdd_alive ENABLE VCC Vbat 2.2 mF VLDO3 30 mA LDO Vdd_alive 1V 2.2 mF R11 I/O voltage PWRFAIL_SNS R12 - PWRFAIL R19 + Vref = 1 V AGND1 AGND2 Figure 1. TPS650250 Functional Block Diagram According to the recommended Power-Up sequence given in section 3.1 a power-up sequence consisting of two groups was selected and realized in this power reference design. The first group consists of all rails supplied by DCDC1, DCDC2 and the LDO LDO1. The second group contains LDO3 and LOD3 and LDO4. 4 Power Supply Reference Design for Freescale™i.MX35 Using TPS650250 Copyright © 2010, Texas Instruments Incorporated SLVU343 – April 2010 Submit Documentation Feedback Powering Freescale™ i.MX35 using TPS650250 www.ti.com Table 3. TPS650250 assignment of Converter Output rails Supply Rail Voltage [V] TPS65051 Output Sequencing Order VCC Core 1.0V / 1.4V DCDC3 1 NVCC I/O 1.8 DCDC2 1 USB OTG PHY USB HOST PHY OSC24M OSC_AUDIO I/O 3.3 DCDC1 2 MVDD PVDD I/O 1.5 LDO1 2 SLVU343 – April 2010 Submit Documentation Feedback Power Supply Reference Design for Freescale™i.MX35 Using TPS650250 Copyright © 2010, Texas Instruments Incorporated 5 Powering Freescale™ i.MX35 using TPS650250 www.ti.com Figure 2. Reference Design Schematic 6 Power Supply Reference Design for Freescale™i.MX35 Using TPS650250 Copyright © 2010, Texas Instruments Incorporated SLVU343 – April 2010 Submit Documentation Feedback Measurement Results www.ti.com Table 4. Bill of Materials Count RefDes 5 Value Description Size Part Number MFR 2 C1, C5 1.0 µF Capacitor, Ceramic, 6.3V, X5R,10% 0603 C1608X5R0J105K TDK 3 C12–C14 2.2 µF Capacitor, Ceramic, 6.3V, X5R, 10% 0603 C1608X5R0J225K TDK 1 C16 10 nF Capacitor, Ceramic, 6.3V, X5R,10% 0603 C1608X5R0J105K TDK 9 C2–C4, C6– C11 10 µF Capacitor, Ceramic, 6.3V, X5R, 10% 0805 C2012X5R0J106K TDK 2 L1, L3 2.2 µH Inductor, SMT, 1.72A, 59milliohm 0.157 x 0.157 inch VLCF4020T-2R2N1R7 TDK 1 L2 3.3 µH Inductor, SMT, 1.52A, 78milliohm 0.157 x 0.157 inch VLCF4020T-3R3N1R5 TDK 1 Q1 MOSFET, Nch SOT23 Std Std 2 R10, R17 200k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R16 40.2k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R18 90.9k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R19 182k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R21 68k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R22 330k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R4 1 Resistor, Chip, 1/16W, 5% 0603 Std Std 1 R5 1.0M Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R6 470k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R7 0 Resistor, Chip, 1/16W, 1% 0603 2 R8, R11 301k Resistor, Chip, 1/16W, 1% 0603 1 R9 100k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 U1 TPS650250RHB IC, Power Management ICs for Li-Ion Powered Systems QFN-32 TPS650250RHB TI Measurement Results Figure 3. Start-up SLVU343 – April 2010 Submit Documentation Feedback Power Supply Reference Design for Freescale™i.MX35 Using TPS650250 Copyright © 2010, Texas Instruments Incorporated 7 Measurement Results www.ti.com Figure 4. Voltage Scaling 1.3V to 1.0V Figure 5. Voltage Scaling 1.0V to 1.3V 8 Power Supply Reference Design for Freescale™i.MX35 Using TPS650250 Copyright © 2010, Texas Instruments Incorporated SLVU343 – April 2010 Submit Documentation Feedback Measurement Results www.ti.com 100 90 VI = 3.8 V 80 Efficiency - % 70 VI = 4.2 V VI = 5 V 60 50 40 30 TA = 25°C, VO = 3.3 V, PFM/PWM Mode 20 10 0 0.1 1 10 100 1k IO - Output Current - mA 10k Figure 6. Efficiency DCDC1 VI = 2.5 V Efficiency - % VI = 3.8 V VI = 4.2 V VI = 5 V TA = 25oC VO = 1.8 V PWM / PFM Mode 0.01 0.1 1 10 100 1k 10 k IO - Output Current - mA Figure 7. Efficiency DCDC2 SLVU343 – April 2010 Submit Documentation Feedback Power Supply Reference Design for Freescale™i.MX35 Using TPS650250 Copyright © 2010, Texas Instruments Incorporated 9 References www.ti.com 100 TA = 25°C, 90 VO = 1.5 V, PWM/PFM Mode 80 Efficiency - % 70 VI = 2.5 V 60 VI = 3 V 50 VI = 3.8 V 40 30 VI = 4.2 V 20 VI = 5 V 10 0 0.01 0.1 1 10 100 IO - Output Current - mA 1k Figure 8. Efficiency DCDC3 6 References 1. i.MX35 data sheet from Freescale Semiconductor, MCIMX35SR2CEC,REV2 ,2/2009 2. TPS650250 datasheet from Texas Instruments (SLVS843A), December 2008 10 Power Supply Reference Design for Freescale™i.MX35 Using TPS650250 Copyright © 2010, Texas Instruments Incorporated SLVU343 – April 2010 Submit Documentation Feedback IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. 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