Texas Instruments TPS65070RSLT

Overview

TPS65070RSLT from Texas Instruments is a highly integrated power management IC (PMIC) for single-cell Li-Ion/Li-Polymer portable systems, featuring a 2-A power path manager, linear battery charger (1.5-A max), three 2.25-MHz step-down converters (up to 1.5 A each), two LDOs (200-mA max), wLED boost driver, 10-bit ADC, and touch screen interface. It powers OMAP-L1x8 processor cores, memory, and peripherals in navigation devices.

For engineers reviewing the TPS65070RSLT datasheet, TPS65070RSLT pinout, TPS65070RSLT application, or TPS65070RSLT equivalent, key selection criteria include its 48-pin VQFN (6 mm × 6 mm) package, I²C programmability, thermal regulation, dynamic voltage scaling on LDO2, and integrated touch controller with four analog inputs - all critical for compact, thermally constrained handheld designs.

Technical Context

The TPS65070RSLT implements a dual-input power path architecture accepting USB (up to 1.3-A limit) or AC adapter (up to 2.5-A) input, with automatic source selection and thermal regulation. Its three synchronous buck converters operate at fixed 2.25-MHz frequency, support PFM/PWM modes, and feature 100% duty-cycle capability for low-dropout operation.

It integrates two independent LDOs (VLDO1/VLDO2) with fixed outputs (1.8 V / 3.3 V per device option), 20-µA quiescent current, and dynamic voltage scaling on LDO2 via I²C. The wLED boost converter supports up to two LED strings (25 mA per string) with internal dimming control, while the 10-bit ADC monitors four analog inputs including touch screen X/Y plates and temperature sensing.

Key Specifications

Pinout & Package

TPS65070RSLT is housed in a 48-pin VQFN package (6.00 mm × 6.00 mm, 0.4-mm pitch) with exposed thermal pad. The package supports high-power dissipation (R_θJC(bot) = 1 °C/W) and requires soldering the thermal pad to a solid GND plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65070RSLT, TPS65073RSL omits touch functionality and reduces DCDC current capability - suitable for non-touch OMAP35xx systems - while TPS650701RSLT retains full compatibility but doubles DCDC1 current capacity for upgraded SoCs.

Availability

TPS65070RSLT is available at Aetrix Electronics and suitable for portable navigation systems, OMAP-L1x8 handhelds, PDAs, and low-power DSP evaluation platforms requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS65070RSLT 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 over 90 years of innovation in energy-efficient electronics.

The TPS6507x product line was designed specifically for single-cell Li-Ion portable systems requiring tightly integrated battery charging, multi-rail DC/DC conversion, LDOs, backlight driving, and touch interface - targeting navigation, PDA, and OMAP-based handheld markets.

FAQ

What is the maximum supported input voltage for the AC and USB pins on the TPS65070RSLT?

The TPS65070RSLT accepts up to 17 V on the AC pin and up to 5.8 V on the USB pin under normal operating conditions. Absolute maximum ratings specify 20 V on AC/USB pins, but sustained operation above 5.8 V on USB risks overvoltage lockout activation. The power path manager automatically selects the valid input source and regulates SYS output accordingly.

Does the TPS65070RSLT support dynamic voltage scaling on both LDOs?

No, only LDO2 (VLDO2) supports dynamic voltage scaling via I²C commands; LDO1 (VLDO1) has a fixed 1.8-V output in the TPS65070RSLT variant. The LDO_CTRL1 register controls VLDO2 voltage steps (e.g., 1.2 V, 1.3 V, 1.8 V, 3.3 V), enabling real-time adaptation to peripheral activity states without hardware changes.

How does the TPS65070RSLT handle battery temperature monitoring?

The TPS65070RSLT uses the TS pin (Pin 11) to interface with an external NTC thermistor. It supports both 10-kΩ (Curve 2) and 100-kΩ (Curve 1) thermistors, with internal programming to linearize response using parallel resistor compensation (75 kΩ or 360 kΩ). Temperature data informs thermal regulation of the charger and can trigger safety shutdown if thresholds are exceeded.

Can the TPS65070RSLT drive more than two LED strings?

No, the TPS65070RSLT's wLED boost converter supports exactly two LED strings via ISINK1 and ISINK2 pins, each capable of up to 25 mA. The FB_WLED feedback loop and L4 switch node are optimized for this dual-string topology; adding further strings would require external current sinks or a second PMIC.

What is the purpose of the PB_IN and POWER_ON pins on the TPS65070RSLT?

PB_IN (Pin 25) initiates system startup when pulled low; it features an internal 50-kΩ pull-up to AVDD6. POWER_ON (Pin 13) must be asserted high by the host processor after PB_IN activation to maintain the ON state - if POWER_ON is released low, the PMIC shuts down even if PB_IN remains active. This handshake prevents unintended resets during processor boot sequences.