Texas Instruments TPS650240RHBT

Overview

TPS650240RHBT from Texas Instruments is a highly integrated power management IC (PMIC) for single-cell Li-ion/Li-polymer powered systems, delivering three synchronous step-down converters (1.0 A / 0.8 A / 0.8 A), two 200 mA general-purpose LDOs, and one 30 mA always-on Vdd_alive LDO. It supports dynamic voltage scaling on the core rail (DCDC3: 1.0 V or 1.3 V), operates at 2.25 MHz switching frequency, and features PFM/PWM mode selection via MODE pin for high efficiency across load ranges - used in ARM-based processors and cellular handsets.

For engineers reviewing the TPS650240RHBT datasheet, TPS650240RHBT pinout, TPS650240RHBT application, or TPS650240RHBT equivalent, key selection considerations include confirmed DCDC3 dual-voltage configuration (1.0 V / 1.3 V), validated 32-pin VQFN (5 mm × 5 mm) package with thermal pad, verified quiescent current of 40–60 µA in PFM mode, and explicit enable control per converter (EN_DCDC1/2/3) and LDO bank (EN_LDO).

Technical Context

The TPS650240RHBT integrates three independent buck regulators with internal P- and N-channel MOSFETs, each featuring soft-start (750 µs ramp), adjustable output via external resistor dividers (DEFDCDC1/2/3), and selectable PFM/PWM operation. Its analog ground (AGND1/AGND2) and power ground (PGND1/2/3) separation supports noise-sensitive mixed-signal applications.

Control logic includes dedicated enable pins per converter and LDO group, voltage detection via PWRFAIL_SNS with open-drain PWRFAIL output, and thermal shutdown at 160 °C with 20 °C hysteresis. The device uses a single VCC supply shared across all converter control circuitry and requires external input/output capacitors (e.g., 10–22 µF COUT per DCDC) and 1.5–2.2 µH inductors.

Key Specifications

Pinout & Package

The TPS650240RHBT is housed in a thermally enhanced 32-pin VQFN package (5.00 mm × 5.00 mm) with an exposed PowerPad connected to AGND for improved thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power management IC applications.

Compared with TPS650241RHBT and TPS650242RHBT, the TPS650240RHBT offers the narrowest DCDC3 voltage range (1.0 V / 1.3 V) optimized for standard ARM Cortex-A/M series operation, with balanced current capability and lowest quiescent current among the family - making it ideal for cost- and power-sensitive portable designs.

Availability

TPS650240RHBT is available at Aetrix Electronics and suitable for smartphone baseband processors, ARM-based industrial controllers, GPS navigation modules, and digital camera image processors requiring stable component supply and long-term production support.

Supply support for TPS650240RHBT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with over 50 years of innovation in high-reliability, energy-efficient IC design.

The TPS65024x product line was engineered specifically for Li-ion-powered portable electronics, integrating multiple DC-DC converters and LDOs into a single small-footprint package to minimize board space and simplify power architecture in space-constrained devices.

FAQ

What is the confirmed DCDC3 output voltage configuration for TPS650240RHBT?

The TPS650240RHBT has a fixed dual-voltage DCDC3 output: 1.0 V when DEFDCDC3 is logic LOW, and 1.3 V when DEFDCDC3 is logic HIGH. This configuration is explicitly defined in the datasheet's Voltage Options table and Pin Functions section, and differs from other variants like TPS650241RHBT (0.9 V / 1.375 V) or TPS650242RHBT (1.0 V / 1.5 V). No external resistor divider is required to set these values.

Does TPS650240RHBT support independent enable control for each DC-DC converter?

Yes, the TPS650240RHBT provides dedicated active-high enable pins for each buck converter: EN_DCDC1 (pin 20), EN_DCDC2 (pin 19), and EN_DCDC3 (pin 18). This allows precise power sequencing - for example, enabling DCDC3 first to power the processor core before bringing up DCDC1 (I/O) and DCDC2 (memory). Each pin accepts 1.45–3.6 V logic HIGH to activate its respective regulator.

What is the thermal performance of TPS650240RHBT in its VQFN package?

The TPS650240RHBT in the 32-pin VQFN (RHB) package has a junction-to-ambient thermal resistance (RθJA) of 32.2 °C/W and a junction-to-board resistance (RθJB) of 6.2 °C/W. Its exposed PowerPad must be soldered to a thermal pad on the PCB for effective heat dissipation. Under full-load conditions (1.0 A + 0.8 A + 0.8 A), proper layout with ≥2 cm² copper pour under the PowerPad keeps junction temperature within the 125 °C limit at 85 °C ambient.

How does the PWRFAIL function operate on TPS650240RHBT?

The TPS650240RHBT monitors battery voltage via the PWRFAIL_SNS pin (pin 30), comparing it to an internal 1.0 V reference with ±2% tolerance and 40–60 mV hysteresis. When the sensed voltage falls below the threshold, the open-drain PWRFAIL output (pin 21) pulls LOW, signaling imminent power loss. This allows the host processor to initiate safe shutdown, save state, or trigger backup power switchover - critical for data integrity in portable systems.

What are the recommended external components for TPS650240RHBT DCDC1 operation?

For DCDC1 (1.0 A, 3.3 V or 2.8 V output), TI specifies a 2.2 µH inductor (L1, pin 6), 10–22 µF output capacitor (COUTDCDC1), and ≥10 µF input capacitor (CINDCDC1). The feedback network uses DEFDCDC1 (pin 9) tied to GND or VDCDC1 for fixed output, or an external resistor divider for adjustable range (0.6 V to VINDCDC1). A 1-Ω RC filter (RCC) between VCC and input rails is recommended to stabilize UVLO behavior under PWM operation.