TPS40140RHHT Integrated Circuits (ICs)

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1. Description

The TPS40140RHHT is a multifunctional synchronous buck controller that can be configured to provide either a single-output 2-phase power supply or a power supply that supports two independent outputs. SeveralTPS40140RHHT controllers can be stacked up to a 16-phase single output power supply. Alternatively, several controllers providing multiple independent outputs can be synchronized in an interleaving pattern for improved input ripple current. The TPS40140RHHT can convert from a 15-V input to a 0.7-V output at 1 MHz. Each phase operates at a switching frequency of up to 1 MHz. The two phases in one device operate 180° out-of-phase. In a multiple-device stackable configuration, the phase shift of the slaves, relative to a master, is programmable.

2. Features

    1. VDD from 4.5 to 15 V, With Internal 5-V Regulator

    2. VOUT from 0.7 V to 5.8 V

    3. Converts from 15-V Input to 0.7-V Output at 1 MHz

    4. Dual-Output or 2-Phase Interleaved Operation, Stackable to 16 Phases

    5. Supports Prebiased Outputs Programmable Switching Frequency up to 1 MHz/Phase

    6. 0.5% Internally Trimmed 0.7-V Reference

    7. 10-μA Shutdown Current

    8. Current Mode Control With Forced Current Sharing

    9. 1- to 40-V Power Stage Operation Range

  10. Power Sharing From Different Input Voltage Rails

  11. True Remote Sensing Differential Amplifier

  12. Programmable Input Undervoltage Lockout (UVLO) 

  13. Resistive or Inductor DCR Current Sensing

  14. Provide a 6-Bit Digitally Controlled Output When Used With TPS40120

  15. 36-Pin VQFN Package

3. Applications

    1. Graphic Cards

    2. Internet Servers

    3. Networking Equipment

    4. Telecommunications Equipment

    5. DC Power Distributed Systems

4. Pin configuration

5. Feature Description

    1. Clock Master and Clock Slave

        A controller may function as a 'clock master' or a 'clock slave'. The term 'clock master' designates the controller, in a multi-controller configuration, that generates the CLKIO signal for clock synchronization between the clock master and the clock slaves. The CLKIO signal is generated when the 'RT' pin of the clock master is terminated with a resistor to ground and the PHSEL pin of the clock master is terminated with a resistor, or resistor string, to ground. The 'Clock slave' is configured by connecting the RT pin to BP5. Then the Clock slave receives the CLKIO signal from the clock master. The phasing of the slave is accomplished with a resistor string tied to the PHSEL pin. More information is covered in the Clock Master, PHSEL, and CLKIO Configurations section.

    2. Voltage Master and Voltage Slave

        A voltage master has the channel that monitors the output voltage and generates the 'COMP' signal for voltage regulation. A Voltage slave channel is configured by connecting the TRKx pin to BP5. Then the COMP signal from the master is connected to the COMPx pin on the Voltage slave. When the TRKx pin is connected to BP5 the COMPx output for that channel is put in a high impedance state, allowing the regulation for that channel to be controlled by the voltage master COMP signal.

6. Application Information

The following sections are partitioned to facilitate applying the TPS40140RHHT in various modes and configurations. The first sections describe functions that are used in all configurations. The following sections are specific to the configuration (that is, single controller, multiple controllers, master and slave).