STMicroelectronics STOD03BTPUR

Overview

STOD03BTPUR from STMicroelectronics is a dual DC-DC converter IC designed specifically for active-matrix OLED display power supplies, integrating a synchronous step-up converter (4.9 V), an LDO post-regulator (4.6 V fixed), and a programmable inverting converter (-2.4 V to -5.4 V). It delivers ≥150 mA per output, operates from 2.3 V to 4.8 V input, and features SWIRE single-wire digital programming, 1.5 MHz PWM switching, and true shutdown (<1 µA quiescent current) - deployed in cellular phones and portable multimedia devices.

For engineers reviewing the STOD03BTPUR datasheet, STOD03BTPUR pinout, STOD03BTPUR application, or STOD03BTPUR equivalent, key selection criteria include its dual-rail AMOLED bias capability, SWIRE-configurable negative voltage, LDO-suppressed ripple on VO1, thermal/UVLO protection, and DFN12L (3 × 3 mm) package compatibility with high-density portable PCB layouts.

Technical Context

The STOD03BTPUR implements two independent synchronous DC-DC stages: a boost converter with average-current-mode control feeding a low-noise LDO (VO1 = 4.6 V ±46 mV over line/load/temp), and an inverting converter with digitally programmable output via SWIRE (31 discrete levels at 100 mV steps). Both stages use pulse-skipping mode at light load and transition to fixed-frequency 1.5 MHz PWM under medium/high load.

SWIRE enables MCU-driven configuration without additional I²C/SPI lines: it uses self-clocked CMOS-level pulses (250 kHz max), includes glitch filtering, and supports simultaneous enable/disable control alongside the dedicated EN pin. The device integrates soft-start, overtemperature protection (140 °C trip, 15 °C hysteresis), undervoltage lockout (2.25 V rising threshold), and internal current limiting for both LX1 and LX2 switching nodes.

Key Specifications

Pinout & Package

STOD03BTPUR is housed in a thermally enhanced DFN12L package (3 mm × 3 mm, 0.6 mm height) with exposed pad internally connected to AGND. The 12-pin top-side layout supports high-current paths and low-noise analog separation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX17125ETA+T and RTQ2132B-QA, STOD03BTPUR uniquely combines SWIRE-based VO2 programmability, true-shutdown <1 µA current, and LDO-filtered VO1 in a 3 × 3 mm DFN - making it optimal for space-constrained, dynamically tuned AMOLED systems where analog noise and standby leakage are critical.

Availability

STOD03BTPUR is available at Aetrix Electronics and suitable for smartphone display power, portable media player subsystems, and digital camera viewfinder designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for STOD03BTPUR 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 sensor solutions for automotive, industrial, and consumer markets.

The STOD03B product line targets high-efficiency, space-optimized power conversion for next-generation AMOLED displays - emphasizing integrated protection, digital configurability, and minimal external component count.

FAQ

What is the function of the SWIRE pin on STOD03BTPUR?

The SWIRE pin implements a self-clocked, single-wire digital interface that allows an external MCU to program the negative output voltage (VO2) across 31 discrete levels from -2.4 V to -5.4 V in 100 mV steps. It also supports remote enable/disable control and requires no pull resistors, using CMOS-level signaling with built-in glitch filtering for robust operation in noisy portable environments.

How does the LDO stage improve AMOLED display performance?

The integrated LDO post-regulator on VO1 delivers a fixed 4.6 V output with <±20 mV load transient response and ultra-low ripple (<10 mVpp), directly addressing AMOLED's sensitivity to voltage noise. This eliminates grayscale banding and improves color fidelity by stabilizing anode bias during rapid pixel current changes - a benefit not achievable with standalone DC-DC converters.

Can STOD03BTPUR operate from a single 3.7 V Li-ion cell throughout its discharge cycle?

Yes. STOD03BTPUR operates across 2.3 V to 4.8 V input, fully covering the usable range of a single Li-ion cell (3.0 V to 4.2 V nominal, down to 2.5 V cutoff). Its UVLO threshold of 2.25 V ensures reliable startup even at end-of-discharge, while pulse-skipping mode maintains >75% efficiency at light loads typical during display idle states.

What PCB layout practices are critical for STOD03BTPUR thermal and noise performance?

Key practices include: separating AGND and PGND planes with single-point connection at CIN; placing CREF directly between VREF and AGND; routing LX1/LX2 traces short and wide with minimum loop area; connecting the exposed pad to AGND via ≥4 thermal vias; and isolating VINA from VINP except at the CIN pad. These reduce ground bounce, improve thermal dissipation (RthJA = 33 °C/W), and suppress switching noise on VO1/VO2.