Texas Instruments TPS659102A1RSL

Overview

TPS659102A1RSL from Texas Instruments is an integrated power-management unit (PMU) designed for Rockchip RK29xx/RK30xx application processors. It delivers three step-down DC-DC converters (VDD1, VDD2, VIO), one step-up 5-V DC-DC converter (VDD3), eight LDOs, and a real-time clock with 32.768-kHz crystal support - all in a 48-pin QFN package. It enables dynamic voltage scaling via SmartReflex Class 3 interface for dual-core processor power optimization.

For engineers reviewing the TPS659102A1RSL datasheet, TPS659102A1RSL pinout, TPS659102A1RSL application, or TPS659102A1RSL equivalent, this device supports precise power sequencing, thermal shutdown protection, I²C-controlled LDO voltage selection, and backup battery management - critical for portable embedded systems requiring multi-rail Li-ion battery operation.

Technical Context

The TPS659102A1RSL implements an embedded power controller (EPC) to manage boot-up and sleep-state sequencing for Rockchip-based platforms. Its dual-core SMPS (VDD1/VDD2) accept independent SmartReflex Class 3 commands over dedicated SR-I²C, enabling real-time voltage/frequency adaptation based on processor load.

It integrates a 32.768-kHz RTC oscillator with external crystal support (OSC32KIN/OSC32KOUT), internal RC option, calendar/alarm functions, and VRTC LDO with backup battery input (VBACKUP). All eight LDOs - including VDAC, VPLL, VAUX1/2, VDIG1/2, VAUX33, VMMC - are fully programmable via high-speed CTL-I²C interface.

Key Specifications

Pinout & Package

TPS659102A1RSL uses a 48-pin QFN package (RSL) with 0.4-mm pitch and exposed thermal pad (AGND). Pin functions are validated per TI SWCS046U datasheet Section 4.1 and Figure 4-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65910A1RSL, TPS659102A1RSL offers Rockchip-specific sequencing and register defaults, while RT8070ZSP trades integration for footprint reduction and eliminates RTC/backup functionality - making TPS659102A1RSL the sole choice for feature-complete RK29xx/RK30xx power management.

Availability

TPS659102A1RSL is available at Aetrix Electronics and suitable for portable medical monitors, industrial HMI panels, smartphone baseband subsystems, and automotive infotainment gateways requiring stable component supply, long-term lifecycle assurance, and qualified automotive-grade sourcing.

Supply support for TPS659102A1RSL 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.

The TPS65910x product line was developed specifically to address the multi-rail, low-noise, and dynamic voltage scaling requirements of application processors from Rockchip, Samsung, TI, and Freescale - with TPS659102A1RSL tailored for Rockchip RK29xx/RK30xx SoCs.

FAQ

What is the primary target processor family for the TPS659102A1RSL?

The TPS659102A1RSL is explicitly designed for Rockchip RK29xx and RK30xx application processors, as confirmed in TI's SWCS046U datasheet Table 3-1. Its power-up sequencing, register defaults, and SmartReflex Class 3 implementation are calibrated for these SoCs - unlike TPS65910A1RSL (for TI AM335x/OMAP) or TPS659101A1RSL (for Samsung S5PV210). The TPS659102A1RSL ensures correct voltage ramp timing and rail dependencies required by Rockchip's boot ROM.

Does the TPS659102A1RSL support external 32.768-kHz crystal operation?

Yes, the TPS659102A1RSL supports external 32.768-kHz crystal operation via dedicated OSC32KIN and OSC32KOUT pins, with specified crystal tolerance of ±20 ppm at 27°C and load capacitance range of 6–12.5 pF. It also includes an internal RC oscillator as fallback. The RTC retains time during main power loss using VBACKUP, and the crystal oscillator contributes ≤ ±0.5 ppm/°C frequency drift - meeting precision timing requirements for portable devices.

How many independent power rails does the TPS659102A1RSL generate?

The TPS659102A1RSL generates seven independent regulated power rails: three step-down DC-DC converters (VDD1, VDD2, VIO), one step-up 5-V DC-DC converter (VDD3), and eight LDOs (VDAC, VPLL, VAUX1, VAUX2, VDIG1, VDIG2, VAUX33, VMMC). While it contains eight LDOs, VRTC is an internal LDO powering only the RTC block and is not user-configurable as a system rail - resulting in seven user-accessible output rails.

What is the function of the SR-I²C interface on the TPS659102A1RSL?

The SR-I²C interface (pins SDASR_EN2 and SCLSR_EN1) on the TPS659102A1RSL implements SmartReflex Class 3 protocol to enable real-time, closed-loop dynamic voltage scaling of VDD1 and VDD2. Unlike standard I²C, SR-I²C allows the host processor to send voltage setpoint commands directly to the PMU's power controllers without CPU intervention - reducing latency and power overhead. This interface is distinct from the CTL-I²C bus used for configuration and monitoring.

Is thermal shutdown protection implemented in the TPS659102A1RSL?

Yes, the TPS659102A1RSL includes hardware-based thermal shutdown protection that triggers at 125°C junction temperature, as specified in Section 5.9 of the SWCS046U datasheet. It also features hot-die detection logic that asserts the INT1 interrupt flag before shutdown occurs, allowing firmware to initiate thermal throttling. Thermal resistance values (RΘJA = 37°C/W, RΘJC = 16.4°C/W) are characterized for the RSL package under still-air conditions per JEDEC JESD51-2.