STMicroelectronics STOD03ASTPUR

Overview

STOD03ASTPUR from STMicroelectronics is a dual synchronous DC-DC converter IC designed specifically for active-matrix OLED (AMOLED) display power supplies. It integrates a fixed 4.6 V step-up converter and a programmable inverting converter (–2.4 V to –5.4 V in 100 mV steps), supports 2.5–4.5 V input, delivers ≥200 mA per rail, and operates at 1.5 MHz PWM switching frequency with 85% typical efficiency.

For engineers reviewing the STOD03ASTPUR datasheet, STOD03ASTPUR pinout, STOD03ASTPUR application, or STOD03ASTPUR equivalent, this device is selected for compact, high-efficiency dual-rail bias generation in space-constrained portable displays where SWIRE-based dynamic voltage tuning, fast discharge, and true shutdown (<1 µA IQ) are critical design requirements.

Technical Context

The STOD03ASTPUR employs average current-mode control for both converters, enabling stable regulation across wide input (2.5–4.5 V), load (0–200 mA), and temperature (–40 °C to +85 °C) ranges. Its dual-path architecture uses separate power (VINP) and analog (VINA) inputs, isolated PGND/AGND planes, and integrated overtemperature (140 °C) and short-circuit protection.

SWIRE implements a self-clocked, single-wire digital interface (250 kHz max) that allows an MCU to set the negative output voltage in real time without additional I/O pins or clock lines - eliminating external DACs or resistive dividers while maintaining ±0.5% output accuracy over temperature and line variation.

Key Specifications

Pinout & Package

STOD03ASTPUR is housed in a thermally enhanced DFN12L package (3 mm × 3 mm, 0.6 mm height) with exposed pad internally connected to AGND and requiring PCB connection to both AGND and PGND for optimal thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX17125ETJ+T and TPS65136RGTR, STOD03ASTPUR uniquely combines SWIRE-based single-pin programmability, true sub-µA shutdown, and integrated fast discharge - making it optimal for next-generation portable AMOLED systems demanding minimal footprint, dynamic panel calibration, and ultra-low standby power.

Availability

STOD03ASTPUR is available at Aetrix Electronics and suitable for smartphone main displays, wearable AMOLED panels, and digital camera viewfinders requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for STOD03ASTPUR 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/mixed-signal ICs for automotive, industrial, and consumer markets.

The STOD03AS belongs to ST's AMOLED display power management product line, engineered specifically to replace discrete boost/inverter solutions with a single-chip, SWIRE-configurable dual-rail converter optimized for battery-powered portable displays.

FAQ

What is the function of the SWIRE pin on STOD03ASTPUR?

The SWIRE pin implements a self-clocked, single-wire digital interface that allows an external MCU to program the negative output voltage (VO2) in 100 mV steps from –2.4 V to –5.4 V. It uses CMOS/TTL logic levels (0.6 V low, 1.2 V high), requires no system clock, and includes internal low-pass filtering to reject glitches - eliminating external DACs or resistor networks while supporting real-time panel calibration.

How does STOD03ASTPUR achieve high efficiency across light and heavy loads?

STOD03ASTPUR automatically switches between pulse-skipping mode (PSM) at light loads (<10 mA) and fixed-frequency PWM mode (1.5 MHz) at medium/heavy loads. PSM reduces switching losses by gating entire PWM cycles, maintaining >80% efficiency down to 1 mA, while PWM ensures tight regulation and low noise above 10 mA - all without external mode-control circuitry.

What is the purpose of separate VIN A and VIN P pins?

VIN A supplies only the analog control circuitry (reference, SWIRE, EN, error amplifiers), while VIN P powers the high-current switching stages (Lx1/Lx2 drivers and power MOSFETs). This separation prevents switching noise from modulating the reference or control loops, ensuring stable 4.6 V and programmable VO2 outputs even under dynamic load transients - critical for AMOLED grayscale accuracy.

Does STOD03ASTPUR require external components for startup and protection?

No external components are required for startup or protection: STOD03ASTPUR integrates soft-start with inrush current limiting, undervoltage lockout (UVLO), overtemperature shutdown (140 °C), short-circuit protection, and fast discharge (8 ms). Only six external passive components are needed - two inductors, three capacitors (CIN, CMID, CO2), and one reference bypass cap (CREF) - enabling minimal BOM count and high reliability.