Texas Instruments LP8758A2E3YFFR

Overview

LP8758A2E3YFFR 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), supports 2.5 V to 5.5 V input, 0.5 V to 3.36 V programmable output voltages with DVS, and operates with 90° phase interleaving to reduce input ripple - used in SSDs, optical modules, and drone SoC power domains.

For engineers reviewing the LP8758A2E3YFFR datasheet, LP8758A2E3YFFR pinout, LP8758A2E3YFFR application, or LP8758A2E3YFFR equivalent, key selection considerations include per-rail current limit programming (2.5–5 A), I²C-controlled slew rate (0.4–30 mV/µs), soft-start sequencing, load-current measurement without external sense resistors, and thermal warning/shutdown at 105 °C / 150 °C.

Technical Context

The LP8758A2E3YFFR integrates four fully synchronous buck cores with independent feedback (FB_B0–FB_B3), switch nodes (SW_B0–SW_B3), and dedicated input pins (VIN_B0–VIN_B3) - all internally isolated but externally tied together. Each core features current-mode control, programmable forward current limit (ILIM FWD), and negative current limit (ILIM NEG) for bidirectional protection.

It implements automatic PWM-PFM mode transition (PFM-to-PWM at ~600 mA, PWM-to-PFM at ~240 mA), 90° phase interleaving across all four channels, and spread-spectrum switching (±5% frequency dither) to suppress EMI peaks. The device uses a single 3.4-MHz-capable I²C interface (SCL/SDA) with maskable interrupt (nINT) for fault reporting and status monitoring.

Key Specifications

Pinout & Package

LP8758A2E3YFFR is housed in a 35-pin DSBGA (Die Size Ball Grid Array) package, YFF variant, measuring 2.16 mm × 2.16 mm × 0.46 mm (0.4-mm pitch). The package supports solder reflow per JEDEC J-STD-020 and includes separate power grounds (PGND_B01, PGND_B23) and substrate ground (SGND) for optimal noise isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS659122YFFT and RTQ2134B-QT, LP8758A2E3YFFR uniquely combines per-rail programmability, 90° phase interleaving, and integrated current sensing - enabling smaller total solution size, lower EMI, and real-time power telemetry without external components.

Availability

LP8758A2E3YFFR is available at Aetrix Electronics and suitable for SSD power management, optical transceiver modules, drone flight controllers, and mobile SoC power domains requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LP8758A2E3YFFR 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 and automotive-grade reliability.

The LP8758A2E3YFFR belongs to TI's LP87xx family of highly integrated, I²C-programmable multi-rail PMICs - engineered specifically for low-power, high-density applications including mobile processors, network interface cards, and solid-state storage.

FAQ

What is the maximum supported I²C clock frequency for LP8758A2E3YFFR?

The LP8758A2E3YFFR supports High-Speed I²C mode up to 3.4 MHz when bus capacitance is ≤100 pF, enabling rapid register access for dynamic voltage scaling and real-time load-current readback. At 400-kHz Fast Mode, it remains compatible with legacy controllers while maintaining full functionality across all registers and interrupt flags in the LP8758A2E3YFFR device.

Does LP8758A2E3YFFR support independent voltage sequencing across its four outputs?

Yes, LP8758A2E3YFFR supports fully programmable startup and shutdown sequencing via I²C registers and hardware enable inputs (EN1/EN2). Each buck rail can be assigned individual delay times, voltage ramp rates, and dependency relationships - allowing precise control over power-up order and timing for complex SoCs or FPGAs without external sequencers.

Can LP8758A2E3YFFR measure load current without external sense resistors?

Yes, LP8758A2E3YFFR integrates a high-accuracy current-sense ADC that measures average inductor current per rail with 20-mA LSB resolution and <10% error above 1 A. This eliminates the need for external sense resistors, saving PCB area, reducing power loss, and simplifying layout - a capability confirmed in the LP8758A2E3YFFR electrical characteristics table (Section 6.5).

What thermal protection features does LP8758A2E3YFFR provide?

LP8758A2E3YFFR provides configurable thermal warning at either 105 °C or 125 °C (via CONFIG.TDIE_WARN_LEVEL), followed by hard thermal shutdown at 150 °C with 15 °C hysteresis. These thresholds are monitored continuously and reported via interrupt (nINT) and status registers - ensuring safe operation in thermally constrained LP8758A2E3YFFR deployments such as sealed drone modules or stacked mobile PCBs.

Is LP8758A2E3YFFR pin-compatible with other variants in the LP8758 family?

No, LP8758A2E3YFFR is not pin-compatible with LP8758-E3 or LP8758A1E3YFFR. While all share the YFF DSBGA-35 package, pin functions differ significantly - e.g., LP8758A2E3YFFR assigns VOUT2/VOUT1/VOUT0/VOUT3 to specific FB/SW/VIN groups per its A2 configuration, whereas other variants map rails differently. Always verify pin mapping against the LP8758A2E3YFFR-specific datasheet revision.