STMicroelectronics STOD14PUR

Overview

STOD14PUR from STMicroelectronics is a dual-channel synchronous DC-DC converter IC designed specifically for AMOLED display biasing, integrating a 4.6 V fixed buck converter and a programmable inverting converter (–2.4 V to –6.0 V) with 700 mA output capability per channel, 1.6 MHz PWM switching, and S-WIRE digital voltage programming - deployed in ultra-mobile PCs and portable media players.

For engineers reviewing the STOD14PUR datasheet, STOD14PUR pinout, STOD14PUR application, or STOD14PUR equivalent, key selection criteria include its dual-rail output architecture, true shutdown with fast discharge, integrated short-circuit and overtemperature protection, and compatibility with low-ESR ceramic external components for compact AMOLED power solutions.

Technical Context

The STOD14PUR implements average current-mode control for both converters, ensuring stable regulation across input voltages (6–13 V), load currents (0–700 mA), and temperature (–40 °C to 85 °C). Its synchronous rectification uses internal P- and N-channel MOSFETs with R_DS(ON) ≤ 0.5 Ω (buck) and ≤ 0.5 Ω (inverter), enabling 85% typical system efficiency.

Startup sequencing includes controlled soft-start (6 ms total), short-circuit startup detection on VO1, and independent fast discharge paths for both outputs. The S-WIRE interface supports 41 discrete negative voltage settings (100 mV steps) using single-wire CMOS-level signaling without external clock or handshake.

Key Specifications

Pinout & Package

STOD14PUR is housed in a thermally enhanced DFN12L package (4 mm × 4 mm, 0.5 mm pitch, 0.75 mm height) with exposed pad tied to AGND/PGND for optimal thermal dissipation (R_thJA = 33 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-rail AMOLED bias converter applications.

Compared with TPS65136RGTR and MAX17105ATI+T, STOD14PUR uniquely combines S-WIRE simplicity, 700 mA per rail, and DFN12L compactness - making it optimal for space-constrained, thermally sensitive AMOLED designs requiring dynamic bias tuning without added interface overhead.

Availability

STOD14PUR is available at Aetrix Electronics and suitable for digital photo frames, ultra-mobile PCs, and mobile internet devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for STOD14PUR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, microcontrollers, and analog ICs for automotive, industrial, and consumer markets.

The STOD14PUR belongs to ST's AMOLED display power management product line, engineered to replace discrete multi-IC solutions with highly integrated, thermally optimized dual-rail converters for portable visual interfaces.

FAQ

What is the purpose of the SWIRE pin, and how is it used in system design?

The SWIRE pin implements a single-wire digital interface that allows an MCU to program the negative output voltage (VO2) across 41 discrete levels from –2.4 V to –6.0 V in 100 mV steps. It uses CMOS/TTL logic levels (0.6 V low, 1.2 V high), requires no external clock or pull-up, and operates up to 250 kHz. In system design, it replaces resistor networks or DACs, reducing component count and enabling real-time VSN calibration for temperature or aging compensation.

How does the STOD14PUR handle startup under short-circuit conditions?

The STOD14PUR incorporates Short-Circuit Startup Detection (SSD) that monitors VO1 during the initial soft-start phase. If VO1 fails to reach nominal voltage within the expected window, the device halts startup and enters power-off state - preventing sustained fault current. Recovery requires a new EN pulse after the short is removed. This protects both the IC and the AMOLED panel from damage during manufacturing test or field faults.

Can the STOD14PUR operate with input voltages below 6 V?

No. The absolute minimum operating input voltage is 6 V, enforced by an undervoltage lockout (UVLO) with 5.2 V turn-on threshold and 4.8 V turn-off hysteresis. Below 6 V, the device remains in shutdown mode and delivers no output. This ensures stable regulation and prevents erratic behavior during battery discharge or transient dips - critical for reliable AMOLED panel operation.

What layout practices are essential for thermal and electrical performance?

Essential layout practices include connecting the exposed pad directly to both AGND and PGND using ≥6 thermal vias; separating analog (VINA) and power (VINP) inputs and joining them only at the CIN capacitor pad; placing input/output capacitors within 2 mm of respective pins; and routing LX1/LX2 traces wide and short with minimal loop area. These practices reduce thermal resistance (R_thJA = 33 °C/W), suppress EMI, and maintain PSRR >60 dB at low frequencies.