Texas Instruments TPS65530RSLT

Overview

TPS65530RSLT from Texas Instruments is a fully integrated 8-channel DC/DC converter with synchronous buck, buck-boost, boost, and inverting topologies-supporting digital still camera (DSC) power architectures. It delivers regulated outputs from 0.9 V to 20 V across eight independent channels, integrates power MOSFETs on CH1–CH7, operates from 1.5 V to 5.5 V input, and features programmable soft-start, thermal shutdown, and channel-specific enable sequencing.

For engineers reviewing the TPS65530RSLT datasheet, TPS65530RSLT pinout, TPS65530RSLT application, or TPS65530RSLT equivalent, this device serves as a single-chip power management solution for multi-rail DSC systems requiring precise ON/OFF sequencing, LED backlight current control, CCD bias generation, and low-quiescent-current sleep mode operation.

Technical Context

The TPS65530RSLT implements six switching regulators (CH1–CH7, excluding CH8) with integrated NMOS FETs and bootstrap-driven high-side gates. CH1/CH3 are voltage-mode synchronous buck converters for core/memory rails; CH2/CH4 use H-bridge synchronous buck-boost topology for DSP I/F and AFE supplies; CH5/CH6 provide nonsynchronous boost and inverting outputs for CCD± bias; CH7 delivers constant-current white LED drive with brightness adjustment via B-ADJ.

CH8 is an external-FET-controlled synchronous boost channel with PFM/PWM mode selection, while REF is an internal 2.8 V LDO. Power sequencing is managed through XSLEEP, ENAFE, EN56, EN7, and SEQ56 pins, enabling hierarchical startup/shutdown for DSC subsystems-including priority-based soft-start slopes and latch-off protection for OCP, OVP, and thermal events.

Key Specifications

Pinout & Package

TPS65530RSLT uses a 48-pin QFN package with exposed PowerPAD™ thermal pad soldered to PGND for optimal heat dissipation. Pin functions are defined per TI SLVS744C datasheet, with dedicated terminals for each channel's switch nodes (SWx), feedback (FBx), enable (ENx), and sequencing control (SEQ56, S/S, S/S56).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-channel PMIC applications.

Compared with TPS65530RSLT, TPS65531RSLT offers minor electrical refinements within identical mechanical and functional compatibility, whereas TPS65280D3RGER sacrifices critical DSC-specific features-including CCD inversion and wide-range LED boost-for reduced channel count and cost in simpler portable devices.

Availability

TPS65530RSLT is available at Aetrix Electronics and suitable for digital still camera power management, CCD imaging subsystems, and portable optical device designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS65530RSLT 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, high-efficiency power conversion ICs.

The TPS65530RSLT belongs to TI's Digital Still Camera PMIC product line, engineered specifically to consolidate complex multi-rail power trees-including core, memory, sensor bias, and LED backlight-into a single QFN package with hardware-enforced sequencing.

FAQ

What is the maximum output voltage supported by the TPS65530RSLT on its CH7 channel?

The TPS65530RSLT supports a CH7 output voltage range of 3 V to 20 V, configured as a constant-current boost regulator for white LED strings. This range is achieved using external feedback resistors and the FBV pin reference (1.0 V typical), with overvoltage protection triggered at 1.25 V sensed at FBV-corresponding to ~15 V at the LED anode under standard resistor scaling. The TPS65530RSLT datasheet confirms operation up to 20 V with appropriate external component derating.

Does the TPS65530RSLT integrate power MOSFETs for all eight channels?

No-the TPS65530RSLT integrates power MOSFETs for CH1 through CH7, but CH8 is implemented as a controller for external high-side and low-side FETs (driven via SW8HD and SW8LD pins). This architecture allows scalable current delivery beyond the limits of on-die FETs while maintaining precise gate timing and PFM/PWM mode flexibility. The TPS65530RSLT datasheet explicitly states "integrated power MOSFET switch except CH8" in its feature summary.

How does the TPS65530RSLT handle power sequencing for CCD-related channels CH5 and CH6?

The TPS65530RSLT uses the SEQ56 pin (Pin 47) to select sequencing behavior for CH5 and CH6: when SEQ56 is low, CH5 follows the S/S slope and CH6 follows S/S56; when SEQ56 is high, both follow S/S56. Enable is controlled jointly by EN56 (Pin 46), and power-up occurs only after CH1–CH3 are stable. This ensures CCD± rails activate only after core logic is operational-preventing latch-up or signal contention. The TPS65530RSLT functional description details this hierarchical dependency in Figure 2 and Table 1.

What is the purpose of the FBG7/8 pin on the TPS65530RSLT?

The FBG7/8 pin (Pin 31) serves as a dedicated ground reference node for the feedback dividers of both CH7 and CH8, isolating their analog sensing paths from noisy power or digital grounds. This improves regulation accuracy and stability-especially critical for CH7's constant-current LED control and CH8's high-side sensing. The TPS65530RSLT datasheet specifies FBG7/8 must be connected directly to AGND or a clean analog ground plane, not shared with PGND or digital return paths.

Can the TPS65530RSLT operate from a single 2.5 V input supply?

Yes-the TPS65530RSLT supports input voltages from 1.5 V to 5.5 V across multiple supply pins (VCC1, VCC2, VCC3, etc.), and its CH1/CH3 buck converters can regulate down to 0.9 V even with 2.5 V input. However, CH5 (boost), CH6 (inverter), and CH7 (boost LED) require sufficient headroom: CH5 needs ≥1.5 V input to generate 15 V; CH6 requires ≥2.8 V to reach –7.5 V; CH7 needs ≥3 V to start. The TPS65530RSLT application note confirms 2AA battery configurations often route CH8 output to VCC1/VCC3 when input falls below 2.5 V.