Texas Instruments LP8758A2EAYFFR

Overview

LP8758A2EAYFFR from Texas Instruments is a quad-channel synchronous step-down DC-DC converter IC designed for low-power processor power management in space-constrained mobile and embedded systems. It delivers four independent 4-A output rails (VOUT0–VOUT3 = 800 mV each), operates from 2.5 V to 5.5 V input, supports I²C interface up to 3.4 MHz, and features programmable slew rate (0.4–30 mV/µs) and 90° phase interleaving to reduce input ripple.

For engineers reviewing the LP8758A2EAYFFR datasheet, LP8758A2EAYFFR pinout, LP8758A2EAYFFR application, or LP8758A2EAYFFR equivalent, key selection considerations include its 35-pin DSBGA (YFF) package, integrated current sensing without external resistors, dynamic voltage scaling (DVS), spread-spectrum EMI reduction, and thermal warning/shutdown with configurable thresholds.

Technical Context

The LP8758A2EAYFFR implements four independent current-mode synchronous buck regulators, each with programmable forward current limit (2.5–5 A), negative current limit (1.6–2.4 A), and soft-start-controlled slew rate. Its 90° phase interleaving across all four cores minimizes input capacitor RMS current and reduces peak input ripple by ~70% versus single-phase operation.

Control is fully register-based via I²C supporting standard (100 kHz), fast (400 kHz), fast+ (1 MHz), and high-speed (3.4 MHz) modes. Protection includes per-rail short-circuit detection, overtemperature warning (105°C/125°C configurable), shutdown (150°C), VANA UVLO (2.3–2.5 V), and load-current measurement with ±10% accuracy above 1 A.

Key Specifications

Pinout & Package

The LP8758A2EAYFFR is housed in a 35-pin, 2.13 mm × 2.13 mm, 0.4-mm pitch DSBGA package (YFF), optimized for minimal PCB footprint and thermal performance (R_θJA = 56.1°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-buck DC-DC converter applications.

Compared with LP8758E0EAYFFR and LP8758E3EAYFFR, the LP8758A2EAYFFR provides identical 4×800-mV default outputs and full 4-A capability on all channels-making it optimal for homogeneous low-voltage SoC cores where rail symmetry and maximum per-rail current are critical.

Availability

LP8758A2EAYFFR is available at Aetrix Electronics and suitable for optical modules, drone systems, and solid-state drives requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LP8758A2EAYFFR 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-efficiency DC-DC conversion.

The LP8758-EA product line targets space-constrained, battery-sensitive applications such as mobile SoCs, network interface cards, and SSDs-delivering multi-rail power with minimal footprint, high light-load efficiency, and robust protection.

FAQ

What is the default output voltage configuration of the LP8758A2EAYFFR?

The LP8758A2EAYFFR is factory-programmed with identical 800-mV output voltages on all four buck channels (VOUT0–VOUT3). This uniform configuration supports homogeneous low-voltage processor cores and simplifies system-level power sequencing. The voltage is programmable via I²C registers across 0.5–3.36 V in fine-grained steps (5–20 mV), and the LP8758A2EAYFFR retains these settings in non-volatile memory after power cycle.

Does the LP8758A2EAYFFR support dynamic voltage scaling (DVS) with controlled slew rate?

Yes, the LP8758A2EAYFFR supports DVS with eight programmable slew-rate settings ranging from 0.4 mV/µs to 30 mV/µs. This feature is implemented per buck channel via dedicated SLEW_RATEx[2:0] registers and ensures controlled voltage transitions during processor frequency scaling-minimizing overshoot, undershoot, and inrush current. The LP8758A2EAYFFR's slew-rate control is active during both startup and runtime voltage changes.

How does the LP8758A2EAYFFR reduce input ripple current?

The LP8758A2EAYFFR reduces input ripple current through 90° phase interleaving of its four buck converters. By staggering switching events evenly across the 360° cycle, the combined input current waveform exhibits significantly lower RMS and peak amplitude compared to parallel non-interleaved operation. This allows designers to use smaller input bulk capacitors and achieve cleaner input supply behavior-critical in noise-sensitive applications like optical modules and RF subsystems.

Can the LP8758A2EAYFFR measure output load current without external sense resistors?

Yes, the LP8758A2EAYFFR integrates on-die current sensing for all four buck channels, enabling accurate load-current measurement without external sense resistors. It provides 20-mA LSB resolution and ±10% accuracy for loads ≥1 A, with measurement time of 50 µs in PFM mode and 4 µs in PWM mode. This capability is accessible via I²C registers (SEL_I_LOAD and I_LOAD_DATA) and supports real-time telemetry, thermal derating, and adaptive power management in the LP8758A2EAYFFR.

What protection features are included in the LP8758A2EAYFFR?

The LP8758A2EAYFFR includes comprehensive protection: per-buck short-circuit and overload detection, input UVLO (2.3–2.5 V on VANA), overtemperature warning (configurable at 105°C or 125°C) and shutdown (150°C), and programmable interrupt masking. It also features negative current limiting (1.6–2.4 A), pulldown resistance (150–350 Ω) when disabled, and power-good status flags with ±10–23 mV thresholds. All protections are hardware-asserted and reported via the nINT pin or I²C status registers in the LP8758A2EAYFFR.