Part Number: TPSM265R1SILR

Manufacturer: Texas Instruments

Description: Switching Voltage Regulators 3-V to 65-V input, 100-mA, step-down power module in 2.8 x 3.7 mm package 10-uSiP -40 to 125

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The TPSM265R1 is a small, simple-to-use module that continuously works with input voltages up to 65 V. It functions over a wide input voltage range. A controller, MOSFETs, and an output inductor are integrated within the module. The module is made to implement a power design quickly and simply in a small PCB footprint. There are three output voltage options: two fixed options, 3.3 V and 5 V, and one adjustable option, 1.223 V to 15 V. The load current rating for each choice is 100 mA. The TPSM265R1 runs in PFM mode, which offers maximum effectiveness under light loads. The control strategy offers excellent line and load transient and does not require loop correction.

Despite being made simple and compact, the TPSM265R1 has a lot of functionality. Specific power-up and power-down requirements can be met thanks to hysteresis, UVLO that can be adjusted and precision enabled. There are three possibilities for selected or adjustable start-up timing: internally fixed (900 s), minimum delay (no soft start), and externally programmable soft start with an external capacitor. Sequencing and output voltage monitoring can be done using an open-drain PGOOD indicator. Applications with limited space benefit from the highly compact 2.8-mm, 3.7-mm 1.9-mm packages.

Features for the TPSM265R1

3 V to 65 V, an extensive input voltage range

Options for output voltage:

  • Adjustable 1.223 V to 15 V
  • 3 Or 5 volts fixed
  • The output current of 100 mA.
  • Quiescent current of 10.5 A; internal voltage reference of 1%.
  • PFM operating mode.
  • Ambient temperature range: -40 to 125 degrees Celsius.
  • Low EMI with active slew rate control.
  • CISPR11 (EN55011) EMI requirements are met.
  • Monotonic start-up leads to output that is skewed.
  • Power-good symbol
  • With hysteresis, enable and input UVLO with precision.
  • Hysteretic thermal shutdown protection.
  • The package measures 2.8 mm by 3.7 mm by 1.9 mm.
  • Utilizing WEBENCH Power Designer, construct a unique regulator using the TPSM265R1.

Detailed Description

A simple-to-operate synchronous buck DC-DC power module, the TPSM265R1 converter runs from a 3-V to 65-V supply voltage. The device is designed to convert voltages from supply rails that are 3.3-V, 5-V, 12-V, 24-V, and 48-V unregulated, partially regulated, or fully regulated. The TPSM265R1 delivers up to 100 mA DC load current with excellent efficiency and extremely low input quiescent current in a very small solution size thanks to an integrated power controller, inductor, and MOSFETs. This device enables flexibility to tailor its use to the intended application, even though it is designed for straightforward implementation. When operating in pulse frequency modulation (PFM) mode, a remarkable light-load efficiency performance is achieved.

There is no need for control-loop compensation, which cuts down on design time and external component usage. For extensive system requirements, the TPSM265R1 includes several capabilities, such as an open-drain Power Good circuit for programmable line Undervoltage lockout (UVLO), thermal shutdown with automated recovery, internally fixed or externally-adjustable soft start, monotonic start-up into pre-biased loads, and fault reporting. These capabilities provide a versatile and user-friendly platform for a variety of applications. The pin configuration is intended for an easy layout and only calls for two more components.

Feature Description

Adjustable Output Voltage (FB)

Voltage feedback options for the TPSM265R1 include fixed 3.3 V, fixed 5 V. Programmable 1.223 V to 15 V.

Internal feedback resistors sense the output in the fixed 3.3-V and 5-V versions, which are directly connected to the SENSE+ pin; in the case of the adjustable voltage option, the output is sensed by an external resistor divider that is connected from the output to the FB pin. Two resistors, RFBT and RFBB, are needed to adjust the adjustable option’s output voltage. Between VOUT at the regulation point and the FB pin, connect RFBT. Between the FB pin and GND, attach RFBB. The ratio of output voltage VOUT to FB is controlled by a resistor divider. The suggested RFBT value is 100 k.

2 Input Capacitor Selections

Input capacitance of the ceramic type must be at least 1 F for the TPSM265R1. Use only X5R or X7R ceramic capacitors with an appropriate voltage rating of the highest quality. TI advises adding more capacitance for applications that require capacitance to handle transient loads. The maximum input voltage must be higher than the voltage rating of the input capacitors. TI suggests using numerous capacitors in parallel or a voltage rating twice the maximum input voltage to account for ceramic capacitors’ derating.

Output Capacitor Selection

The TPSM265R1 requires a minimum of 10 F of ceramic-type output capacitance. TI advises adding more capacitance for applications that require capacitance to handle transient loads.

Under voltage Lockout (UVLO),  Precision Enable (EN), and Hysteresis (HYS)

The TPSM265R1 can be precisely turned ON and OFF using the EN pin. The device begins to function when the EN pin voltage rises above the threshold value. Connecting EN straight to VIN is the quickest and easiest way to turn on the TPSM265R1. This makes it possible for the TPSM265R1 to turn on when VIN is inside the legal operating range. Toggle the output on and off for system sequencing or protection, and an external logic signal can also drive the EN input.

Undervoltage lockout (UVLO) circuitry is implemented on the VIN pin of the TPSM265R1. When the internal VIN UVLO threshold is exceeded, the device is disabled on the VIN pin. Both used are a typical hysteresis of 300 mV and a rising threshold for internal VIN UVLO of 2.95 V (max).

The EN input allows adjustable UVLO by connecting a resistor divider from VIN to the EN pin if an application calls for a higher UVLO threshold. The EN pin connects an inbuilt comparator with 68 mV hysteresis and a bandgap voltage of 1.212 volts. The hysteresis voltage can, however, be individually programmed using the HYS pin for applications with precise power-up and power-down needs.

PFM Operation

Pulse frequency modulation (PFM) is the mode in which the TPSM265R1 functions. With an average hysteresis of 10 mV, the TPSM265R1 is a hysteretic voltage regulator that operates between higher and lower feedback regulation thresholds.

Power Good (PGOOD)

When the output voltage is within regulation, the TPSM265R1 outputs a PGOOD signal to inform the user. Utilize the PGOOD signal for downstream converter start-up sequencing, output monitoring, and fault protection. An open-drain output known as PGOOD needs a pull-up resistor to connect to a DC source no higher than 12 V. The typical pull-up resistance range is 10 k to 100 k. If necessary, reduce the voltage from a higher voltage pull-up rail using a resistor divider.

When the output voltage exceeds 94% of the setpoint, the internal PGOOD switch is disabled, allowing the external pull-up to raise PGOOD. The internal PGOOD switch activates if the FB voltage drops below 87% of the setpoint, and PGOOD is pulled low to signal that the output voltage is out of regulation. There is a 5 s  deglitch delay built into PGOOD’s rising edge.

Configurable Soft Start (SS)

The SS soft-start control pin on the TPSM265R1 is adaptable and simple. Inrush current is avoided thanks to the soft-start feature when power is first applied. The desired regulatory voltage is gradually ramped up when the device is powered on or enabled to create a soft start. Minimum delay (no soft start), 900-s internally set soft start, and externally programmable soft-start are three options for selectable and configurable start-up timing.

The internal soft-start control ramp is activated with a soft-start interval of 900 s when the SS pin is left open. By connecting an external capacitor, designated CSS, from SS to GND, the soft-start period can be prolonged. Increasing the soft-start time can help applications with high output voltage or plenty of output capacitance. A longer soft-start time lowers the supply current required to power any output loading and charge the output capacitors. A 10 A internal current source, ISS, charges CSS and creates a ramp to regulate the output voltage’s ramp rate.


The operating voltage range for the TPSM265R1 is between 3 V and 65 V. This input supply needs to sustain a voltage above the predetermined UVLO voltage while supplying the maximum input current. Ensure the input supply rail’s resistance is low enough so that an input current transient won’t result in a significant enough drop at the TPSM265R1 supply rail to trigger a false UVLO fault and force a system reset.

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