STMicroelectronics STOD13ATPUR

Overview

STOD13ATPUR from STMicroelectronics is a dual synchronous DC-DC converter IC designed specifically for AMOLED display power management, integrating a 4.6 V step-up and a programmable inverting converter (–2.4 V to –6.4 V in 100 mV steps), delivering up to 250 mA per rail, operating from 2.5–4.5 V input, with 1.5 MHz PWM switching and 85% typical efficiency.

For engineers reviewing the STOD13ATPUR datasheet, STOD13ATPUR pinout, STOD13ATPUR application, or STOD13ATPUR equivalent, this device is selected for compact, high-efficiency dual-rail bias generation in space-constrained portable displays where TDMA noise immunity, fast discharge, and MCU-controlled negative voltage tuning via SWIRE are critical design requirements.

Technical Context

The STOD13ATPUR implements two independent synchronous buck-boost topologies: a step-up converter with fixed 4.6 V output and an inverting converter with digitally programmable negative output via SWIRE protocol, both using average current-mode control and automatic mode transition between PSM (light load) and PWM (medium/heavy load). It features integrated P/N-channel MOSFETs with R_DS(on) of 1.0–2.0 Ω (P1) and 0.4–1.0 Ω (N1) for the boost stage, and 0.42–0.8 Ω (P2/N2) for the inverter.

Its thermal protection triggers at 140 °C with 15 °C hysteresis, and it supports true shutdown (<1 µA I_{Q_SH}), soft-start with inrush limiting, and fast discharge (400 Ω internal resistor, 10 ms VMID/VO2 discharge time). The FD pin enables/disables fast discharge independently of EN, while SWIRE allows single-wire digital configuration without external clock or handshake.

Key Specifications

Pinout & Package

STOD13ATPUR is housed in a thermally enhanced DFN12L package (3 mm × 3 mm, 0.6 mm height) with exposed pad internally connected to AGND, requiring PCB ground plane connection via multiple vias for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX17105ETJ+T and TPS65136RGTR, STOD13ATPUR uniquely integrates single-wire programmability, true shutdown, and fast discharge in a 3×3 mm DFN-reducing component count and firmware complexity for cost-sensitive, size-constrained AMOLED devices.

Availability

STOD13ATPUR is available at Aetrix Electronics and suitable for AMOLED smartphone display power, portable media player bias supply, and digital camera viewfinder applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STOD13ATPUR 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, designing and manufacturing analog, mixed-signal, power, and microcontroller products for automotive, industrial, and consumer markets.

The STOD13A belongs to ST's display power management IC portfolio, engineered specifically for high-efficiency, low-noise dual-rail bias generation in battery-powered AMOLED systems with stringent size and EMI constraints.

FAQ

What is the function of the FD pin on STOD13ATPUR?

The FD (Fast Discharge) pin is an active-low control that enables or disables the internal 400 Ω discharge path between VMID/VO2 and AGND after shutdown. When FD is pulled low, the device rapidly discharges both output rails within 10 ms to prevent image retention on AMOLED panels; when high, discharge is inhibited. FD operates independently of the EN pin and does not affect normal regulation.

How does SWIRE programming work on STOD13ATPUR?

SWIRE is a proprietary single-wire, self-clocked digital interface allowing an MCU to set the negative output voltage (VO2) across 41 discrete levels from –2.4 V to –6.4 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 over the 2.5–4.5 V supply range. Communication is unidirectional (MCU → STOD13A) and includes built-in glitch filtering.

Can STOD13ATPUR operate with only one output enabled?

No-STOD13ATPUR is designed as an integrated dual-converter system where both the step-up (VMID) and inverting (VO2) stages are always active when EN is high. There is no provision to disable either rail independently; however, the FD pin can selectively discharge VO2 or VMID post-shutdown, and SWIRE allows dynamic reconfiguration of VO2 without affecting VMID regulation.

What are the PCB layout best practices for STOD13ATPUR?

Key layout rules include: (1) separate AGND (analog) and PGND (power) planes tied only at the CIN capacitor pad; (2) place CIN as close as possible to VINP/PGND; (3) route Lx1/Lx2 with short, wide traces and symmetric geometry; (4) connect the exposed pad to AGND using ≥4 thermal vias; (5) isolate VINA from VINP except at CIN; and (6) position CREF adjacent to VREF/AGND with direct low-inductance connection.