Texas Instruments TPS563900DAP

Overview

TPS563900 from Texas Instruments is a dual-channel synchronous step-down DC/DC converter with integrated 90-mΩ high-side and 65-mΩ low-side N-channel MOSFETs, delivering up to 3.5 A per channel across a 4.5–18 V input range. It supports I²C-controlled 7-bit VID programming (0.68–1.95 V in 10-mV steps), 200–1600 kHz adjustable switching frequency, and 180° out-of-phase operation for reduced input ripple - used in TCON power rails for LCD panel timing controllers.

For engineers reviewing the TPS563900 datasheet, TPS563900 pinout, TPS563900 application, or TPS563900 equivalent, key selection considerations include dual-rail programmability via I²C, independent soft-start and enable per channel, pulse-skipping mode for light-load efficiency, thermal warning readback, and HTSSOP-32 (DAP) package thermal performance with θJCbot = 1.3°C/W.

Technical Context

The TPS563900 implements constant-frequency peak-current-mode control with cycle-by-cycle overcurrent protection and hiccup-mode fault recovery. Each buck channel features dedicated COMP pins for simple Type-II compensation and independent SS pins enabling voltage tracking and sequencing.

Its I²C interface supports Standard (100 kHz) and Fast Mode (400 kHz), allowing real-time readback of PGOOD status, die temperature warning (125°C threshold), and VID register values. The internal 6.3-V V7V LDO powers gate drivers and control logic, with external 1-µF decoupling required at the V7V pin.

Key Specifications

Pinout & Package

TPS563900 is housed in a thermally enhanced 32-pin HTSSOP (DAP) package with an exposed power pad soldered to PGND for optimal thermal dissipation (θJCbot = 1.3°C/W). Pin functions are validated per TI SLVSCC7 datasheet Rev. December 2013.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output synchronous buck converter applications.

Compared with TPS563900, TPS543900RGER offers identical functionality with minor I²C address flexibility, while MP8866DD-LF-Z trades full digital control for lower BOM cost and simpler layout - making TPS563900 optimal for systems requiring adaptive voltage scaling and health monitoring.

Availability

TPS563900 is available at Aetrix Electronics and suitable for DTV, TCON, set-top box, and tablet PC applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for TPS563900 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 ICs, with decades of expertise in high-efficiency DC/DC conversion.

The TPS563900 belongs to TI's high-density dual-buck converter product line, designed specifically for space-constrained consumer electronics requiring programmable, low-noise, and thermally robust power delivery.

FAQ

What is the maximum continuous output current per channel for the TPS563900?

The TPS563900 delivers up to 3.5 A of continuous output current per channel under typical thermal conditions (TA ≤ 85°C, proper PCB layout with thermal vias to the exposed pad). This rating assumes adequate heatsinking via the DAP package's exposed thermal pad and use of recommended external components such as low-ESR output capacitors and appropriate inductors rated for ≥4.5 A saturation current.

Does the TPS563900 support independent voltage programming for each output channel?

Yes, the TPS563900 supports fully independent I²C-controlled voltage programming for Buck 1 and Buck 2. Each channel has its own 7-bit VID register, enabling output voltages from 0.68 V to 1.95 V in precise 10-mV steps - allowing asymmetric configurations such as 1.1 V for a processor core and 1.8 V for I/O in the same device.

How does the TPS563900 handle thermal faults, and can the warning threshold be adjusted?

The TPS563900 integrates a die temperature sensor with a fixed 125°C warning threshold and 160°C thermal shutdown trip point. The temperature warning status is readable via I²C register; however, the threshold is not user-adjustable. Firmware must interpret the flag and initiate mitigation (e.g., load reduction) before reaching 160°C, where automatic hiccup-mode shutdown occurs.

Can the TPS563900 operate with a 5-V input supply?

Yes, the TPS563900 operates across a 4.5–18 V input range, making it fully compatible with 5-V input supplies. At 5-V input, it supports output voltages down to 0.68 V with appropriate duty cycle and bootstrap management; the internal V7V LDO regulates to ~6.3 V when VIN ≥ 6.3 V, but remains functional at lower VIN with reduced gate drive strength.

What is the purpose of the ROSC pin on the TPS563900, and how is it configured?

The ROSC pin on the TPS563900 sets the switching frequency from 200 kHz to 1.6 MHz via an external resistor to ground. For example, a 100-kΩ resistor yields ~400 kHz. Alternatively, an external clock signal (200–1600 kHz) applied to ROSC synchronizes both buck channels to a system master clock, eliminating beat frequencies and easing EMI filter design.