Texas Instruments TPS5140PAGG4

Overview

TPS5140PAGG4 from Texas Instruments is a quad-channel DC/DC controller IC integrating three synchronous-buck controllers (CH1–CH3) and one nonsynchronous 12-V boost converter, designed specifically for notebook PC peripheral power rails. It supports 4.5 V–28 V input, delivers adjustable step-down outputs down to 1.2 V, features auto PWM/SKIP mode, and includes integrated 5-V and 3.3-V linear regulators for auxiliary biasing - used in laptop motherboard VRM subsystems powering USB, audio, and card bus circuits.

For engineers reviewing the TPS5140PAGG4 datasheet, TPS5140PAGG4 pinout, TPS5140PAGG4 application, or TPS5140PAGG4 equivalent, key selection criteria include channel independence with 180° phase shift between CH1 and CH2/CH3, programmable short-circuit protection per buck channel, 1.185-V internal reference tolerance of ±1.5%, and dual standby control for both switching and linear regulator sections.

Technical Context

The TPS5140PAGG4 implements voltage-mode PWM control across all three synchronous-buck channels, each with dedicated error amplifiers, skip comparators (8.5-mV hysteresis), and independent soft-start (SOFTSTART1/2/3). CH2 and CH3 operate in-phase while CH1 runs 180° out-of-phase to reduce input ripple and enable smaller bulk capacitance.

The integrated 12-V boost converter uses an internal N-channel MOSFET, supports up to 120 mA output, and features separate OVP/UVP detection (12.9 V / 9.0 V thresholds), PHASE_12V compensation terminal, and SOFTSTART_12V control. The 5-V linear regulator (±4% tolerance, 50-mA max) supplies bootstrap and reference bias; the 3.3-V regulator derives from it or REG5V_IN and delivers up to 30 mA.

Key Specifications

Pinout & Package

TPS5140PAGG4 is housed in a 64-pin TQFP package (PAG) with exposed thermal pad, rated for –20°C to 85°C ambient operation. Pin functions are validated per TI SLVS305A datasheet (Rev. January 2001).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-channel DC/DC controller applications.

Compared with TPS5140PAGG4, TPS51100PAG offers reduced channel count and no boost function, limiting use to basic dual-rail applications, while RT8205AZSP trades integrated LDOs and 12-V boost for higher switching frequency and smaller footprint - necessitating external bias and alternate 12-V generation.

Availability

TPS5140PAGG4 is available at Aetrix Electronics and suitable for notebook PC motherboard design, portable computing power subsystems, and embedded industrial controller power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS5140PAGG4 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 decades of expertise in notebook and mobile power solutions.

The TPS5140 product line was engineered specifically for multi-rail notebook PC power architectures - integrating synchronous buck, boost, and linear regulation to replace discrete power ICs and reduce BOM cost and PCB area.

FAQ

What is the maximum output current supported by the TPS5140PAGG4's integrated 12-V boost converter?

The TPS5140PAGG4's integrated 12-V boost converter supports up to 120 mA output current, as specified in the functional description and confirmed by the "12-V Boost Converter" section of the datasheet. This rating applies under typical operating conditions with IN_12V supplied from a stable 5-V source and appropriate external components (inductor, Schottky diode, output capacitor). The internal N-channel MOSFET and current-limit circuitry are designed for this continuous load level in notebook peripheral applications like PCMCIA slots.

How does the TPS5140PAGG4 implement phase interleaving between its three buck channels?

The TPS5140PAGG4 implements phase interleaving by operating CH2 and CH3 in-phase with the internal oscillator, while CH1 is driven 180° out-of-phase via an internal phase inverter. This configuration reduces total input current ripple amplitude by approximately 70% compared to in-phase operation, allowing designers to use significantly smaller input bulk capacitance. The interleaving is fixed and does not require external configuration - it is inherent to the TPS5140PAGG4's internal block diagram and timing architecture.

Can the TPS5140PAGG4 operate without its internal 5-V linear regulator enabled?

Yes - the TPS5140PAGG4 can operate with its internal 5-V linear regulator disabled by asserting STBY_VREF5 low, provided an external 5-V supply is applied to the REG5V_IN pin (≥4.2 V threshold). In this mode, the external 5-V rail powers both high-side bootstrap circuits and low-side drivers, improving overall conversion efficiency. The internal 5-V regulator remains inactive until STBY_VREF5 is pulled high, and its output (VREF5) is not sourced unless explicitly enabled.

What is the purpose of the TRIP1, TRIP2, and TRIP3 pins on the TPS5140PAGG4?

The TRIP1, TRIP2, and TRIP3 pins on the TPS5140PAGG4 are used to set the overcurrent protection threshold for each respective buck channel (CH1–CH3) by connecting an external resistor to ground. Each pin sources a precision 13-µA (typical) current; the resulting voltage drop across the resistor determines the current limit point at the low-side MOSFET's RDS(on). This resistor-based programming allows designers to tailor OCP levels independently per rail - critical for mismatched load requirements across CPU I/O, memory, and peripheral subsystems.

Does the TPS5140PAGG4 support power sequencing between its multiple output rails?

Yes - the TPS5140PAGG4 supports precise power sequencing through independent STBY1, STBY2, STBY3, and STBY12V inputs, along with separate SOFTSTART1/2/3 and SOFTSTART_12V terminals. Each channel can be enabled or disabled asynchronously, and soft-start timing is individually programmable via external capacitors. Combined with the open-drain PGOUT signal (with programmable delay via PG_DELAY), the TPS5140PAGG4 enables robust, customizable power-up/down sequences required in modern notebook platforms to meet chipset and peripheral initialization timing constraints.