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Numéro de sérieTPS65055
CategoriePower Management => DC-DC Converters => Step-down
Description2.25MHz Dual Step-down Converter With 4 Low Input Voltage LDOs
The TPS65055 is an integrated Power Management IC for applications powered by one Li-Ion or Li-Polymer cell, which require multiple power rails.

The TPS65055 provides two highly efficient,
2.25 MHz step-down converters targeted at providing the core voltage and I/O voltage in a processor-based system. Both step-down converters enter a low power mode at light load for maximum efficiency across the widest possible range of load currents.
SociétéTexas Instruments, Inc.
DatasheetTélécharger TPS65055 datasheet
 
 
  • Description courte

  • 2.25 MHz Dual Step-Down Converter With 4 Low Input Voltage LDOs

    The is an integrated Power Management IC for applications powered by one Li-Ion or Li-Polymer cell, which require multiple power rails. The TPS65055 provides two highly efficient, 2.25 MHz step-down converters targeted at providing the core voltage and I/O voltage in a processor-based system. Both step-down converters enter a low power mode at light load for maximum efficiency across the widest possible range of load currents. For low noise applications the device can be forced into fixed frequency PWM mode using the I2C compatible interface. In shutdown mode, current consumption is reduced to less than 1 µA. The device allows the use of small inductors and capacitors to achieve a small solution size. The TPS65055 provides an output current A on each dcdc converter. The TPS65055 also integrates two 400 mA LDO and two 200 mA LDO voltage regulators, which can be turned on/off using separate enable pins on each LDO. Each LDO operates with an input voltage range between 1.5 V and 6.5 V allowing them to be supplied from one of the step-down converters or directly from the main battery. Two digital input pins are used to set the output voltage of the LDOs from a set of 9 different combinations for to LDO4. Additionally, the converters can be controlled an I2C compatible interface. The TPS65055 is available in a small 32-pin leadless package 4 mm QFN) with 0,4 mm pitch.

    to 95% Efficiency· Output Current for DCDC Converters × 0.6A· Two Selectable Fixed Output Voltages V/1.2 V for DCDC2· VIN Range for DCDC Converters From 6V· 2.25 MHz Fixed Frequency Operation· Power Save Mode at Light Load Current· 180° Out of Phase Operation· Output Voltage Accuracy in PWM Mode ±1%· Low Ripple PFM Mode· Total Typ. 32 µA Quiescent Current for Both DCDC Converters· 100% Duty Cycle for Lowest Dropout· 2 General Purpose 400 mA- High PSRR LDOs· 2 General Purpose 200 mA- High PSRR LDOs· VIN Range for LDOs from 6.5 V· Digital Voltage Selection for the LDOs· I2C Compatible Interface· Available mm 32-Pin QFN Package

    APPLICATIONS

    · Cell Phones, Smart-phones WLAN PDAs, Pocket PCs OMAPTM and Low Power DSP Supply XScale Portable Media Players Digital Cameras

    Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. OMAP, PowerPAD are trademarks of Texas Instruments.

    PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

    These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

    For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. The RSM package is available in tape and reel. Add R suffix (TPS65055RSMR) to order quantities of 3000 parts per reel. Add T suffix (TPS65055RSMT) to order quantities of 250 parts per reel.

    over operating free-air temperature range (unless otherwise noted)

    VALUE Input voltage range on all pins except A/PGND, EN_LDO1 pins with respect to AGND Input voltage range on EN_LDO1 pins with respect to AGND Output voltage range LDO3, LDO4 pins with respect to AGND Current L2, PGND2 Current at all other pins Continuous total power dissipation TA TJ Tst Operating free-air temperature Maximum junction temperature Storage temperature Lead temperature mm (1/16-inch) from case for 10 seconds 1800 1000 See Dissipation Rating Table 150 260

    Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. This device contains circuits to protect its inputs and outputs against damage due to high static voltages or electrostatic fields. These circuits have been qualified to protect this device against electrostatic discharges; HBM according EIA/JESD22-A114-B: 1.5kV; and CDM according EIA/JESD22C101C: 500V, however, it is advised that precautions should be taken to avoid application of any voltage higher than maximum-rated voltages to these high-impedance circuits. During storage or handling, the device leads should be shorted together or the device should be placed in conductive foam. In a circuit, unused inputs should always be connected to an appropriated logic voltage level, preferably either VCC or ground. Specific guidelines for handling devices of this type are contained in the publication Guidelines for Handling Electrostatic-Discharge-Sensitive (ESDS) Devices and Assemblies available from Texas Instruments.

    PACKAGE RSM (1) RJA 58 K/W TA 25°C POWER RATING 1.7 W DERATING FACTOR ABOVE 25°C 17 mW/K = 70°C POWER RATING = 85°C POWER RATING 0.68 W

    The thermal resistance junction-to-case of the RSM package is 4 K/W measured on a high K board.

    MIN VLDO1-3 VLDO2-4 Input voltage range for step-down converters Output voltage range for VDCDC1 step-down converter Output voltage range for VDCDC2 step-down converter Input voltage range for LDOs Output voltage range for LDO1 and LDO3 Output voltage range for LDO2 and LDO4 NOM 4 MAX 2.8 3.0 UNIT

    Submit Documentation Feedback Product Folder Link(s): TPS65055

    MIN L2 COUTDCDC2 CVCC TA TJ RCC (1) (2) Output current at L1 Inductor L1 (1) Input capacitor at VINDCDC1/2 Output capacitor VDCDC1 (1) Output current at L2 Inductor L2 (1) Output capacitor VDCDC2 (1) Input capacitor at VCC

    Input capacitor VINLDO3/4 (1) Output capacitor VLDO1-4 (1) Output current at VLDO1,2 Output current at VLDO3,4 Operating ambient temperature Operating junction temperature Resistor from battery voltage to Vcc used for filtering

    See application section for more details. 2 mA can flow into Vcc when both converters are running in PWM, this resistor causes the UVLO threshold to be shifted accordingly.

    VIN EN = VIN, MODE = GND, = 2.2 µH, COUT = 22 µF, to 85°C, Typical values are = 25°C (unless otherwise noted)

    PARAMETER SUPPLY CURRENT Vcc Input voltage range One converter, IOUT = 0 mA. PFM mode enabled; device not switching, EN_DCDC1 = VIN EN_DCDC2 = VIN; EN_LDO3/4 = GND IQ Operating quiescent current Two converters, IOUT = 0 mA, PFM mode device not switching, Total current into VCC, EN_DCDC1 = VIN and EN_DCDC2 = VIN; EN_LDO3/4 = GND One converter, IOUT = 0 mA, PFM mode enabled; device not switching, EN_DCDC1 = VIN EN_DCDC2 = VIN; EN_LDO4 = VIN One converter, IOUT = 0 mA, Switching with no load, PWM operation EN_DCDC1 = VIN EN_DCDC2 = VIN; EN_LDO3/4 = GND Two converters, IOUT = 0 mA, Switching with no load, PWM operation EN_DCDC1 = VIN AND EN_DCDC2 = VIN; EN_LDO3/4 = GND EN_DCDC2 = GND EN_LDO4 = GND Voltage at VCC V µA TEST CONDITIONS MIN TYP MAX UNIT

    Shutdown current Undervoltage lockout threshold for DCDC converters and LDOs

    EN_LDO3, EN_LDO4 VIH High-level input voltage, SDAT, SCLK, EN_LDO3, EN_LDO4 Low-level input voltage SDAT, SCLK, DEFDCDC2 1.2 VCC V