Texas Instruments TPS6735ID

Overview

TPS6735ID from Texas Instruments is a fixed-frequency, current-mode PWM inverting DC/DC converter delivering −5 V at up to 200 mA from 4.5–6.2 V input. It integrates a 0.4-Ω p-channel MOSFET power switch, 1.22-V reference output (125 µA capable), and EN-controlled shutdown (1 µA quiescent). Used in board-level negative rail generation for computer peripherals and battery-powered systems requiring high efficiency (78% typical) and low no-load supply current (1.9 mA).

For engineers reviewing the TPS6735ID datasheet, TPS6735ID pinout, TPS6735ID application, or TPS6735ID equivalent, key selection considerations include its inverting topology, SOIC-8 package, −40°C to 85°C operating range, soft-start capability via external capacitor, and compatibility with Schottky rectifier-based discrete power stages.

Technical Context

The TPS6735ID implements a 160-kHz fixed-frequency current-mode PWM control architecture with slope compensation, UVLO (3.7 V), and cycle-by-cycle overcurrent protection (2 A peak). Its error amplifier compares FB voltage against an internal 1.22-V reference, while the SS pin enables controlled startup via external capacitor discharge through a 1.2-MΩ internal resistor.

Power delivery uses an integrated p-channel MOSFET with gate driven by the −5-V output rail-enabling reduced die area-and features soft-start clamping, COMP pin compensation (82 pF typical), and feedback via resistive divider from OUT to REF. The EN input provides logic-level shutdown with full functional disable and 1-µA supply current.

Key Specifications

Pinout & Package

TPS6735ID is housed in an 8-pin SOIC (D) package per JEDEC MS-012, with gull-wing leads, 1.27 mm pitch, and exposed die pad not electrically connected. Package dimensions: 4.9 × 3.9 × 1.75 mm (max height), RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar inverting DC/DC converter applications.

Compared with MAX735CPA+, TPS6735ID offers higher integration (integrated p-FET), better efficiency, and lower shutdown current; versus TPS6733ID, it provides inverted polarity output required for specific analog biasing and legacy interface rails - making it irreplaceable in dedicated negative-rail applications.

Availability

TPS6735ID is available at Aetrix Electronics and suitable for computer peripherals, battery-powered test equipment, and industrial sensor signal conditioning requiring stable component supply and long-term production continuity.

Supply support for TPS6735ID 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 high-reliability DC/DC conversion solutions.

The TPS6735 product line was designed specifically for compact, efficient board-level generation of negative voltage rails in space-constrained and battery-sensitive applications - emphasizing integration, low quiescent current, and robust transient performance.

FAQ

What is the maximum output current capability of the TPS6735ID?

The TPS6735ID delivers up to 200 mA continuous output current at −5 V under recommended operating conditions (VCC = 4.5–6.2 V, TA = −40°C to 85°C). Peak switch current is limited to 2 A, and performance curves confirm stable operation up to 270 mA at nominal input. For sustained 200 mA loads, proper thermal management using the SOIC-8 package's 725 mW power rating at 25°C is required.

Does the TPS6735ID require external components to operate?

Yes, the TPS6735ID requires five external components for basic operation: an inductor (10 µH), input filter capacitor (47 µF), output filter capacitor (100 µF), Schottky rectifier (e.g., 1N5817), and reference filter capacitor (10 µF). Additional components - including 82 pF on COMP and optional soft-start capacitor on SS - are needed for full specification compliance across load and temperature ranges.

Can the TPS6735ID be used to generate voltages other than −5 V?

No - the TPS6735ID is a fixed-output inverting converter with internal feedback set for −5 V regulation. Its FB pin is internally tied to a 1.22-V reference, and the output voltage is determined by the external resistor divider ratio. While the datasheet does not support adjustable output, the TPS6735ID is not designed for reconfiguration; alternative parts like the TPS61040 are required for programmable outputs.

What is the purpose of the REF pin on the TPS6735ID?

REF on the TPS6735ID provides a buffered 1.22-V reference voltage capable of sourcing up to 125 µA. It serves dual purposes: (1) as the internal feedback reference for output regulation, and (2) as a precision bias source for external circuitry such as op-amp references or ADC voltage dividers. A 10 µF capacitor to GND is mandatory to ensure stability and low-noise operation.

Is the TPS6735ID pin-compatible with other members of the TPS67xx family?

TPS6735ID is pin-compatible with the TPS6735IP (PDIP-8) and MAX735 series, but not with other TPS67xx variants like TPS6733ID (which generates +5 V). While pin numbering and terminal functions match across TPS6735x variants, output polarity and internal regulation are fixed per part number - so substitution requires verification of both electrical function and mechanical fit.