Texas Instruments LP3913SQ-AE/NOPB

Overview

LP3913SQ-AE/NOPB from Texas Instruments is a programmable power management IC optimized for flash-based portable media players, integrating two 150 mA LDOs (LDO1: 1.3 V–3.3 V, LDO2: 1.3 V–3.3 V), three DVS buck converters (Buck1: 600 mA, 0.8 V–2.0 V; Buck2/Buck3: 600/500 mA, 1.8 V–3.3 V), an 8-bit 4-channel A/D converter, and a linear Li-ion charger with USB/adapter dual-source support. It enables compact, thermally robust system power architecture in handheld consumer electronics.

For engineers reviewing the LP3913SQ-AE/NOPB datasheet, LP3913SQ-AE/NOPB pinout, LP3913SQ-AE/NOPB application, or LP3913SQ-AE/NOPB equivalent, this page delivers verified functional partitioning, validated I²C-programmable voltage settings, confirmed thermal shutdown behavior (160°C), exact WQFN-48 package mapping, and real-world battery charge sequencing logic - all critical for portable media player PMIC selection and layout integration.

Technical Context

The LP3913SQ-AE/NOPB implements dynamic voltage scaling across three independent buck converters, each with programmable output via I²C interface at 400 kHz. Its dual-slope 8-bit ADC monitors battery voltage and charge current for fuel gauging, while dedicated analog/digital ground separation (AGND/DGND) and internal bias generation (IREF pin with 121 kΩ resistor) ensure precision in mixed-signal operation.

Charging control includes automatic source arbitration between USBPWR and CHG_DET inputs, seamless switchover with adapter priority, reverse-current blocking during USB suspend, and configurable termination voltages (4.1 V / 4.2 V / 4.38 V) with ±0.35% accuracy at 25°C. Thermal supervision features interrupt-driven alerts (IRQB) and hardware shutdown at 160°C with 20°C hysteresis.

Key Specifications

Pinout & Package

The LP3913SQ-AE/NOPB is housed in a 6 mm × 6 mm × 0.8 mm 48-pin WQFN package (NJV0048A) with exposed thermal pad for efficient heat dissipation in space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP3913SQ-AE/NOPB, LP3910SQ/NOPB offers identical software and pinout but reduced integration (no Buck3, fewer ADC inputs), while TPS65023RSBR trades integrated charging for higher LDO current and broader buck flexibility - making LP3913SQ-AE/NOPB uniquely suited for self-contained flash-media Li-ion systems.

Availability

LP3913SQ-AE/NOPB is available at Aetrix Electronics and suitable for portable media players, handheld gaming devices, and portable navigation systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for LP3913SQ-AE/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 and embedded processing technologies, with decades of expertise in power management IC design for portable electronics.

The LP3913 product line was engineered specifically for flash-memory-based portable media players, integrating battery charging, multi-rail DC/DC conversion, analog sensing, and system sequencing into a single thermally optimized package.

FAQ

What output voltage ranges are supported by LP3913SQ-AE/NOPB's LDO1 and LDO2?

LP3913SQ-AE/NOPB's LDO1 supports 1.2 V–3.3 V, and LDO2 supports 1.3 V–3.3 V - both programmable in 100 mV steps via I²C. For the LP3913SQ-AE/NOPB variant specifically, default factory settings are LDO1 = 1.3 V and LDO2 = 3.3 V, as confirmed in Table 1 of the SNVS489I datasheet. These outputs remain stable under load currents up to 150 mA with ≤3% accuracy across line and load conditions.

Does LP3913SQ-AE/NOPB support simultaneous USB and wall adapter charging?

No - LP3913SQ-AE/NOPB implements source arbitration where the wall adapter (CHG_DET) takes precedence over USB (USBPWR). When both are present, the IC seamlessly switches to adapter power and disables USB charging; it does not parallel or sum the sources. This behavior is hardwired in the charge controller logic and cannot be overridden via I²C configuration in the LP3913SQ-AE/NOPB.

How does the LP3913SQ-AE/NOPB handle battery temperature monitoring?

The LP3913SQ-AE/NOPB uses the TS pin to read a battery-pack NTC thermistor, converting resistance changes into temperature readings processed by internal comparators. Thresholds are fixed: upper limit at 2.87 V (≈45–50°C depending on thermistor curve) and lower limit at 0.27 V (≈45–50°C), triggering thermal interrupts or halting charge if exceeded. No calibration or external circuitry is required for basic thermal supervision in the LP3913SQ-AE/NOPB.

What is the function of the POWERACK pin on LP3913SQ-AE/NOPB?

The POWERACK pin on LP3913SQ-AE/NOPB is a digital input used during power-on/off sequencing to acknowledge that downstream power rails have stabilized. It must be driven high by the host system after regulated outputs (e.g., VBUCK1, VLDO2) reach valid voltage levels - enabling controlled ramp-up of SoC or peripheral logic. POWERACK has no internal pull-up/down and requires external assertion to proceed past reset hold-off in the LP3913SQ-AE/NOPB.

Can LP3913SQ-AE/NOPB's ADC measure parameters other than battery voltage and charge current?

Yes - the LP3913SQ-AE/NOPB's 4-channel 8-bit dual-slope ADC includes two undedicated inputs (ADC1 and ADC2) usable for measuring discharge current, battery temperature (via external thermistor divider), keyboard scan matrix voltages, or other analog signals within 0–VDD range. These channels are fully accessible via I²C register reads and require no additional external components beyond standard decoupling, as specified in the LP3913SQ-AE/NOPB functional description.