Texas Instruments LP8758A1B0YFFR

Overview

LP8758A1B0YFFR from Texas Instruments is a four-phase synchronous step-down DC/DC converter IC designed for high-current, low-voltage power rails in mobile application processors. It delivers up to 16 A total output current across four interleaved phases, supports programmable output voltage from 0.5 V to 3.36 V with 5–20 mV step resolution, and operates from 2.5 V to 5.5 V input. It is used in smartphone SoC core voltage regulation where tight transient response and efficiency across light-to-heavy load are critical.

For engineers reviewing the LP8758A1B0YFFR datasheet, LP8758A1B0YFFR pinout, LP8758A1B0YFFR application, or LP8758A1B0YFFR equivalent, key selection considerations include its 3 MHz PWM switching frequency, auto phase-add/shed logic, remote differential feedback capability, I²C interface supporting up to 3.4 MHz, and integrated load current measurement without external sense resistors.

Technical Context

The LP8758A1B0YFFR integrates four buck converter cores into a single 4-phase architecture with phase interleaving to reduce input/output ripple and improve transient response. Each phase features independent high-side (40–90 mΩ) and low-side (33–50 mΩ) FETs, programmable peak current limit (1.5–5 A), and dynamic current balancing (≤10% mismatch above 1 A/phase).

Control is implemented via an I²C-compatible serial interface supporting Standard (100 kHz), Fast (400 kHz), Fast+ (1 MHz), and High-Speed (3.4 MHz) modes. Operation modes include forced PWM, auto PWM-PFM, and forced multi-phase - with programmable start-up/shutdown delays, slew-rate control (0.4–30 mV/µs), and real-time load current monitoring using on-die ADCs.

Key Specifications

Pinout & Package

LP8758A1B0YFFR uses a 35-pin DSBGA (YFF) package with 2.88 mm × 2.13 mm body size and 0.4 mm pitch. The package includes dedicated power, ground, feedback, and control pins distributed across two ground islands (PGND_B01 and PGND_B23) to minimize noise coupling between phase groups.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar four-phase buck converter applications.

Compared with TPS659122YFFR and RTQ2134B-QA, the LP8758A1B0YFFR uniquely combines 16 A capability, remote differential feedback, 8-step slew-rate control, and 3.4 MHz I²C - making it optimal for consumer mobile SoC core rails demanding precision, agility, and minimal BOM overhead.

Availability

LP8758A1B0YFFR is available at Aetrix Electronics and suitable for smartphone, tablet, and handheld gaming device designs requiring stable component supply, long-term production continuity, and full lifecycle support for portable electronics programs.

Supply support for LP8758A1B0YFFR 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, specializing in analog, embedded processing, and power management technologies for industrial, automotive, and consumer markets.

The LP8758A1B0YFFR belongs to TI's LP87xx family of highly integrated PMICs targeting mobile application processors, designed specifically to deliver efficient, tightly regulated, and dynamically controllable power to advanced SoCs in space-constrained portable devices.

FAQ

What is the maximum continuous output current supported by the LP8758A1B0YFFR?

The LP8758A1B0YFFR supports up to 16 A of continuous output current in its 4-phase configuration when input voltage exceeds 3 V and output voltage is below 2 V. This rating assumes proper thermal management, recommended external components (e.g., 0.33 µH inductors, 100 µF total output capacitance), and operation within the –40°C to +125°C junction temperature range. Derating applies at higher ambient temperatures or with reduced airflow.

Does the LP8758A1B0YFFR support remote voltage sensing, and how is it implemented?

Yes, the LP8758A1B0YFFR supports true remote differential voltage sensing via dedicated FB_B0 (positive) and FB_B1 (negative) pins. These connect directly to the point-of-load to compensate for PCB trace resistance, improving output voltage regulation accuracy to ±1.5% under load. In standard 4-phase operation, FB_B2 and FB_B3 are grounded per datasheet guidance.

What I²C speeds does the LP8758A1B0YFFR support, and what are the voltage requirements for SDA/SCL?

The LP8758A1B0YFFR supports I²C Standard (100 kHz), Fast (400 kHz), Fast+ (1 MHz), and High-Speed (3.4 MHz) modes. SDA and SCL pins accept input voltages from 0 V to VANA (up to 3.6 V), and require external pull-up resistors to a compatible VIO rail. For High-Speed mode, bus capacitance must be ≤100 pF to meet timing specifications.

How does the LP8758A1B0YFFR manage phase activation and deactivation under varying load conditions?

The LP8758A1B0YFFR implements automatic phase adding and shedding based on real-time load current: it adds phases at 1 A (1→2), 2 A (2→3), and 3 A (3→4), and sheds them at 0.75 A (2→1), 1.5 A (3→2), and 2.3 A (4→3). This logic is configurable via registers and operates independently in AUTO, forced PWM, or forced multi-phase modes to optimize efficiency and transient response.

Can the LP8758A1B0YFFR measure output current without external sense resistors?

Yes, the LP8758A1B0YFFR integrates on-die current sensing circuitry that measures load current up to 20.46 A with ±10% accuracy (for IOUT ≥ 2 A) using internal FET R_DS(on) monitoring. No external sense resistors are required. Measurement is performed in <50 µs during PFM mode (with brief PWM burst) or <4 µs in PWM mode, and results are accessible via I²C register reads.