Texas Instruments TLV627432YFPR

Overview

TLV627432YFPR from Texas Instruments is a high-efficiency synchronous buck converter optimized for ultra-low-power wearable and energy-harvesting systems. It delivers up to 400 mA output current across an input range of 2.15 V to 5.5 V, features 360 nA typical quiescent current, operates at 1.2 MHz nominal switching frequency using DCS-Control™ topology, and supports eight factory-programmable output voltages (1.2 V–3.3 V) via three VSEL pins - enabling precise power rail management in space-constrained battery-powered devices.

For engineers reviewing the TLV627432YFPR datasheet, TLV627432YFPR pinout, TLV627432YFPR application, or TLV627432YFPR equivalent, key selection criteria include its sub-µA quiescent current performance at light loads, automatic 100% duty-cycle mode for near-dropout operation, RF-friendly PFM/PWM seamless transition, integrated output discharge via VOS pin, and compatibility with tiny 2.2-µH inductors and 10-µF ceramic capacitors in a 1.57 mm × 0.88 mm WCSP package.

Technical Context

The TLV627432YFPR implements TI's DCS-Control™ architecture, combining fast AC load transient response with stable DC regulation through a dual-loop system: an AC path sensing VOS directly drives a high-speed comparator for immediate switching control, while a compensated voltage feedback loop ensures ±2.5% output accuracy across load and line variations. Its quasi-fixed 1.2 MHz PWM mode transitions seamlessly into variable-frequency PFM Power Save Mode below ~10 mA, sustaining >90% efficiency down to 10 µA output current.

Functional modes are tightly coordinated: undervoltage lockout (UVLO) activates at 2.15 V (rising) and releases at 2.0 V (falling); auto 100% mode engages when VIN − VOUT falls below 200 mV (typical enter threshold) and exits above 250 mV (typical leave threshold); and output discharge is activated via internal MOSFET when EN is low or UVLO triggers, ensuring controlled startup sequencing without external circuitry.

Key Specifications

Pinout & Package

TLV627432YFPR uses an 8-ball DSBGA (YFP) package measuring 1.57 mm × 0.88 mm with 0.4-mm ball pitch. The package is bottom-side soldered and requires standard WCSP reflow profile and stencil design.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62743DSKR and MAX77650EWL+T, the TLV627432YFPR uniquely balances ultra-low IQ, eight-programmable outputs, and minimal footprint - making it optimal for space-constrained, multi-voltage, long-life wearable and sensor applications where discrete buck functionality is preferred over integrated PMIC complexity.

Availability

TLV627432YFPR is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE sensor nodes, energy-harvesting IoT endpoints, and smartwatch display subsystems requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for TLV627432YFPR 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 for portable and ultra-low-power systems.

The TLV627432YFPR belongs to TI's TLV627xx family of ultra-low-IQ buck converters, designed specifically for battery-operated wearables, medical sensors, and energy-harvesting devices where micropower efficiency and miniature packaging are primary constraints.

FAQ

What is the minimum input voltage required for TLV627432YFPR to start switching?

The TLV627432YFPR begins switching when the input voltage rises above the undervoltage lockout (UVLO) turn-on threshold of 2.15 V (typical). Below this level, the device remains in shutdown regardless of EN state. Once VIN exceeds 2.15 V, the internal circuitry powers up, and after a 10-ms startup delay followed by a 700-µs soft-start period, regulated output is established. This ensures reliable operation from partially discharged single-cell batteries.

How does TLV627432YFPR achieve 90% efficiency at 10 µA output current?

The TLV627432YFPR achieves 90% efficiency at 10 µA by entering Power Save Mode (PFM), where it pulses the high-side switch only as needed to replenish output capacitor charge, then enters deep sleep with most internal blocks disabled. Combined with 360 nA quiescent current, ultra-low R_DS(ON) MOSFETs (0.45 Ω high-side, 0.22 Ω low-side), and optimized gate drive, this minimizes static and dynamic losses - verified across 1.2–3.3 V outputs and 2.15–5.5 V input ranges per TI SLVSDH5B datasheet Figure 9-2 through 9-4.

Can TLV627432YFPR's output voltage be changed dynamically during operation?

Yes, TLV627432YFPR supports real-time output voltage changes via its VSEL1–VSEL3 pins, which can be toggled between logic high/low states while the device is enabled and regulating. Each combination selects one of eight preset voltages (1.2 V–3.3 V) per Table 6-2 in the datasheet. No reset or re-enabling is required - the output smoothly transitions to the new voltage within microseconds, enabling dynamic power scaling for adaptive sensor or MCU operation.

What happens to the output when TLV627432YFPR enters 100% duty cycle mode?

When TLV627432YFPR enters 100% duty cycle mode - triggered when VIN − VOUT falls below 200 mV (typical) - the internal high-side MOSFET turns fully on and switching ceases. The output voltage becomes VIN minus the IR drop across the internal high-side R_DS(ON) (~0.45 Ω) and series inductor resistance. This eliminates switching ripple and noise, preserving signal integrity in analog/RF sections, while maintaining regulation until VIN rises sufficiently to resume PWM operation.

Is an external resistor divider required to set the output voltage of TLV627432YFPR?

No, TLV627432YFPR does not require an external resistor divider. It integrates a high-impedance internal feedback network programmed exclusively by the VSEL1–VSEL3 pins. These three digital inputs select one of eight factory-trimmed output voltages (1.2 V, 1.5 V, 1.8 V, 2.1 V, 2.5 V, 2.8 V, 3.0 V, or 3.3 V) with ±2.5% accuracy at 10 mA load. This eliminates external components, saves PCB area, and avoids drift from resistor tolerance or temperature effects - confirmed in Section 8.3.3 and Table 6-2 of the TLV627432 datasheet.