Texas Instruments TPS65230A2DCA

Overview

TPS65230A2DCA from Texas Instruments is a highly integrated power management IC (PMIC) for digital set-top boxes, featuring one adjustable PWM buck controller (3.3–6.1 V, 500 kHz), two synchronous step-down regulators (0.9–3.3 V, 1 MHz, 3-A each), two 100-mΩ USB power switches with overcurrent protection, and a dual-input supply voltage supervisor with brownout and thermal warning flags. It operates from a 10.8–22-V input and targets satellite STB and xDSL modem main power rails.

For engineers reviewing the TPS65230A2DCA datasheet, TPS65230A2DCA pinout, TPS65230A2DCA application, or TPS65230A2DCA equivalent, key selection considerations include its triple-buck architecture with independent enable sequencing, I²C/parallel control flexibility, integrated fault flagging (nBOR/nHOT, USBFLG1/2), and thermally enhanced 48-pin HTSSOP package optimized for high-density STB PCBs.

Technical Context

The TPS65230A2DCA integrates three DC-DC conversion blocks: BUCK1 is a high-voltage PWM controller (VIN = 10.8–22 V, VOUT = 3.3–6.1 V, fSW = 500 kHz, Type III compensation); BUCK2 and BUCK3 are low-voltage synchronous buck regulators (VINB = 4.75–6.1 V, VOUT = 0.9–3.3 V, fSW = 1 MHz, 3-A output, integrated 32-mΩ/36-mΩ FETs). All three use external soft-start capacitors and support programmable current limiting via TRIP pin resistor.

Control is implemented via parallel GPIO (EN_BCKx, EN_USBx) or I²C (address 48h/49h), with mode selection determined by pull-up on USBFLAG2/nINT. Fault management includes per-rail overcurrent detection, thermal shutdown at 160°C, early thermal warning at 120°C, and brownout detection at 9.3 V on VIN, all signaled through open-drain nBOR/nHOT and dedicated USB fault pins.

Key Specifications

Pinout & Package

TPS65230A2DCA is housed in a 48-pin HTSSOP (DCA) package with exposed thermal pad, designed for high-power density and thermal reliability in consumer electronics. Pin functions are validated per TI SLVSA10A datasheet Rev. September 2009.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65231A2DCA, TPS65230A2DCA provides identical triple-buck regulation and supervision but with lower USB current rating-making it ideal for cost-constrained STBs with passive USB peripherals. Versus TPS65217CZQW, it delivers higher USB drive capability and standalone buck flexibility at the expense of integrated LDOs and battery management.

Availability

TPS65230A2DCA is available at Aetrix Electronics and suitable for digital set-top boxes, xDSL modems, DVD players with USB host, and home gateway network routers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS65230A2DCA 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 experience delivering high-reliability ICs for consumer, industrial, and communications markets.

The TPS65230 product line was engineered specifically for digital set-top box and broadband access equipment, integrating multiple power rails, USB switching, and intelligent fault monitoring into a single thermally robust package to reduce system complexity and improve time-to-market.

FAQ

What is the maximum output current supported by each buck regulator in the TPS65230A2DCA?

The TPS65230A2DCA supports 3-A continuous output current on both BUCK2 and BUCK3 (0.9–3.3 V range), and BUCK1 delivers up to 3-A depending on input/output voltage differential and thermal conditions. The datasheet specifies 3-A for BUCK2/BUCK3 under typical conditions (VINB = 5 V, VOUT = 3.3 V, TA = 50°C), with efficiency reaching 95% at 2-A load. BUCK1 current capability is application-dependent due to its wider input range and external FET drive architecture.

How does the TPS65230A2DCA handle power-up sequencing between its three buck regulators?

The TPS65230A2DCA implements flexible power-up sequencing via EN_BCK1, EN_BCK2, and EN_BCK3 pins. When pulled directly to V3P3, they enable default sequence: BUCK1 → BUCK2 → BUCK3, with ≥1-ms inter-rail delay. Custom sequencing is achieved by connecting RC networks to these pins-each 1-nF capacitor adds ~0.2-ms delay due to internal 6-µA pull-up current. This allows deterministic, hardware-controlled startup without firmware involvement.

Can the TPS65230A2DCA be used in I²C mode and parallel GPIO mode simultaneously?

No-the TPS65230A2DCA operates exclusively in either I²C mode or parallel GPIO mode, selected by the voltage on the USBFLAG2/nINT pin. A pull-up to 6 V enables I²C (address 48h or 49h), disabling parallel control; a pull-up to 3.3 V or lower disables I²C and activates EN_BCKx/EN_USBx pins. Mixing modes is not supported, and register writes have no effect when I²C is disabled.

What is the function of the nBOR/nHOT pin on the TPS65230A2DCA, and how is it used in system design?

The nBOR/nHOT pin on the TPS65230A2DCA is an open-drain output that asserts low during brownout (VIN < 9.3 V) or thermal warning (junction temp > 120 °C). It provides ≥180-ms active-low pulse to allow host processors to execute safe shutdown routines. Unlike the interrupt pin, nBOR/nHOT state is unaffected by I²C register reads and requires external pull-up; it serves as a hardware-level system health indicator independent of communication interface status.

Does the TPS65230A2DCA include overcurrent protection for its USB power switches, and how is it implemented?

Yes-the TPS65230A2DCA includes per-channel overcurrent protection for both USB switches, with a nominal trip threshold of 0.8 A (range: 0.6–1.0 A) for the TPS65230 variant. When triggered, USBFLG1 or USBFLG2 pulls low, signaling fault to the host. Protection includes 4–15-ms deglitching to reject transients, and recovery is automatic once the overload clears. The switches also feature thermal foldback and shutdown to prevent damage during sustained shorts.