Texas Instruments LP3910SQ-AP/NOPB

Overview

LP3910SQ-AP/NOPB from Texas Instruments is a highly integrated power management IC (PMIC) designed for HDD-based portable media players, featuring two programmable LDOs (LDO1: 2.8 V, LDO2: 1.5 V), two DVS buck converters (Buck1: 1.45 V, Buck2: 1.8 V), a wide-load-range buck-boost (3.3 V), an 8-bit dual-slope ADC, and a linear Li-ion charger with USB/adapter input support and battery temperature monitoring.

For engineers reviewing the LP3910SQ-AP/NOPB datasheet, LP3910SQ-AP/NOPB pinout, LP3910SQ-AP/NOPB application, or LP3910SQ-AP/NOPB equivalent, this device serves as a system-level power solution requiring coordinated sequencing, battery health supervision, multi-rail voltage scaling, and I²C-programmable configuration in space-constrained portable audio/video platforms.

Technical Context

The LP3910SQ-AP/NOPB integrates five independent DC-DC regulation paths - two low-noise LDOs (LDO1/LDO2), two high-efficiency PWM buck converters (Buck1/Buck2) with dynamic voltage scaling, and a wide-load-range buck-boost converter - all managed via a single 400-kHz I²C interface. Its internal 8-bit dual-slope ADC monitors battery voltage, thermistor, charge current, and system inputs with ±1 LSB INL/DNL accuracy.

Battery management includes constant-current/constant-voltage charging (100 mA full-rate), selectable termination voltages (4.1 V / 4.2 V / 4.38 V), 0.35% VTERM accuracy, pre-qualification at 50 mA, and thermal regulation up to 125°C junction. Power-on/off sequencing is controlled through dedicated digital inputs (ONOFF, POWERACK) and programmable turn-on delays (T1–T5).

Key Specifications

Pinout & Package

LP3910SQ-AP/NOPB is housed in a thermally enhanced 6 mm × 6 mm × 0.8 mm 48-pin WQFN package with exposed thermal pad (NJV). The layout separates analog (AGND), digital (DGND), and high-current grounds (BBGND1/2, BCKGND1/2) to minimize noise coupling and optimize thermal dissipation under sustained load.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65023RSBR and TPS65053RGER, the LP3910SQ-AP/NOPB uniquely integrates buck-boost regulation, linear battery charging with 0.35% VTERM accuracy, and 4-channel ADC-based battery supervision - making it the only option among the three suitable for HDD-based portable devices requiring autonomous battery-aware power sequencing.

Availability

LP3910SQ-AP/NOPB is available at Aetrix Electronics and suitable for hard drive-based media players, portable navigation devices, portable gaming players, and audio/video media players requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for LP3910SQ-AP/NOPB 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 in portable and battery-powered system solutions.

The LP3910 product line was developed specifically for HDD-based portable media players, integrating power conversion, battery management, and system supervision into a single IC to reduce bill-of-materials and simplify PCB layout in space-constrained consumer electronics.

FAQ

What is the default output voltage configuration for LP3910SQ-AP/NOPB?

The LP3910SQ-AP/NOPB is factory-programmed with LDO1 = 2.8 V, LDO2 = 1.5 V, Buck1 = 1.45 V, Buck2 = 1.8 V, and Buck-Boost = 3.3 V. These defaults are defined in Table 2 of the SNVS481M datasheet and can be modified via I²C register writes after power-up. The LP3910SQ-AP/NOPB retains these settings until reprogrammed, enabling immediate operation without host initialization.

Does LP3910SQ-AP/NOPB support both USB and wall adapter charging simultaneously?

No - the LP3910SQ-AP/NOPB implements priority-based charging arbitration: wall adapter (CHG_DET) takes precedence over USB (USBPWR). When both sources are present, the device disables USB charging and draws from the adapter. This behavior is hardwired and cannot be overridden; the LP3910SQ-AP/NOPB does not support concurrent dual-source charging or power-path management.

How is battery temperature monitored on LP3910SQ-AP/NOPB?

The LP3910SQ-AP/NOPB monitors battery temperature via the TS pin, which connects to a 100-kΩ NTC thermistor in series with an internal 8-µA current source. The resulting voltage is digitized by the integrated 8-bit ADC. Thresholds for thermal regulation (e.g., 45°C/50°C) are set in the CHSPV register, and the LP3910SQ-AP/NOPB triggers thermal interrupts or reduces charge current if thresholds are exceeded.

What is the purpose of the IREF pin on LP3910SQ-AP/NOPB?

The IREF pin on LP3910SQ-AP/NOPB sets the internal bias current generator using an external 121-kΩ resistor to AGND. This resistor determines the reference current used across multiple internal circuits, including the ADC reference, LDO biasing, and charger current sensing. Deviation from 121 kΩ alters calibration accuracy; the LP3910SQ-AP/NOPB datasheet specifies ±1% tolerance for optimal performance.

Can LP3910SQ-AP/NOPB operate without an I²C host controller?

Yes - the LP3910SQ-AP/NOPB powers up with factory-default voltages and sequencing delays and operates autonomously. All rails regulate and the charger functions without I²C communication. However, dynamic voltage scaling, ADC readback, fault logging, and custom sequencing require I²C interaction; standalone operation is limited to the pre-programmed AP configuration and lacks runtime configurability.