STMicroelectronics STOD13AMTPUR

Overview

STOD13AMTPUR from STMicroelectronics is a dual synchronous DC-DC converter IC designed specifically for AMOLED display power management in portable electronics. It integrates a 4.6 V fixed positive boost converter and a programmable negative inverter (–2.4 V to –5.4 V in 100 mV steps), delivers up to 250 mA per rail, operates from 2.5 V to 4.5 V input, and uses 1.5 MHz PWM switching with pulse-skipping at light load.

For engineers reviewing the STOD13AMTPUR datasheet, STOD13AMTPUR pinout, STOD13AMTPUR application, or STOD13AMTPUR equivalent, this device is selected for compact, high-efficiency dual-rail bias generation where TDMA noise immunity, fast discharge, and MCU-controlled voltage programming via single-wire interface are critical design requirements.

Technical Context

The STOD13AMTPUR implements two independent synchronous buck-boost topologies: a step-up converter with average current-mode control and a dedicated inverting converter using the same architecture. Both stages feature internal 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, and 0.42–0.8 Ω (P2)/0.43–0.8 Ω (N2) for the inverter.

It supports dynamic output programming via SWIRE - a self-clocked, glitch-filtered single-wire protocol operating at ≤250 kHz - enabling real-time adjustment of VO2 without additional I²C/SPI lines. The FD pin independently controls fast discharge of both outputs after shutdown, while EN provides hardware enable/disable with <1 µA shutdown current.

Key Specifications

Pinout & Package

STOD13AMTPUR is housed in a thermally enhanced DFN12L package (3 mm × 3 mm, 0.6 mm height) with an exposed pad internally connected to AGND. The 12-pin layout supports high-current paths, low-noise analog separation (VINA/AGND), and dedicated fast-discharge control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX17105ETJ+ and RT9397BZSP, STOD13AMTPUR uniquely combines programmable negative output, true shutdown, and fast discharge in a 3×3 mm DFN - reducing BOM count by 3 components and PCB area by 40% in space-constrained portable designs.

Availability

STOD13AMTPUR is available at Aetrix Electronics and suitable for smartphone display power, tablet AMOLED bias supply, and wearable OLED module applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for STOD13AMTPUR 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 solutions for automotive, industrial, and consumer markets.

STOD13AMTPUR belongs to ST's Display Power Management IC family, engineered specifically for energy-efficient, noise-immune bias generation in active-matrix OLED systems used in mobile and portable visual interfaces.

FAQ

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

The SWIRE pin implements a self-clocked, single-wire digital interface that allows an MCU to program the negative output voltage (VO2) across 41 discrete levels from –2.4 V to –5.4 V in 100 mV increments. It uses CMOS/TTL logic levels (0.6 V low / 1.2 V high), requires no external clock, and includes internal glitch filtering. In practice, the MCU asserts START/STOP bits and transmits 6-bit data packets to set VO2, eliminating the need for I²C or SPI resources while maintaining precise panel-specific bias control.

How does the FD (Fast Discharge) pin operate, and what is its timing behavior?

The FD pin is an active-low control that enables internal 400 Ω discharge paths from both VMID and VO2 to AGND upon device shutdown. When FD is pulled low (≤0.4 V), the outputs discharge to 10% of nominal voltage within 10 ms under no-load conditions. This prevents residual charge from damaging sensitive OLED pixels during power cycling. The FD function is independent of the EN pin - it remains active even if EN is held high but the device is disabled via SWIRE command.

What are the key PCB layout requirements for stable operation of STOD13AMTPUR?

STOD13AMTPUR requires strict separation of analog (VINA, AGND, VREF) and power (VINP, PGND, LX1, LX2) domains. Input capacitors must be placed directly adjacent to VINP and PGND pins; AGND and PGND planes connect only at the CIN ground pad via multiple vias. The exposed pad must be soldered to a solid AGND copper area with ≥6 thermal vias. LX1 and LX2 traces must be short, wide, and routed on inner layers to minimize parasitic inductance and EMI coupling - critical for achieving specified TDMA noise immunity and 1.5 MHz stability.

Can STOD13AMTPUR operate with input voltages below 2.5 V, and what protection mechanisms engage?

No - STOD13AMTPUR incorporates undervoltage lockout (UVLO) with a rising threshold of 2.25 V (±30 mV) and falling threshold of 2.18 V (±28 mV). Below 2.22 V, the device disables both converters and enters a latched-off state until input rises above 2.25 V. This prevents erratic regulation, excessive inductor current, or uncontrolled startup transients that could damage external components or the OLED panel. UVLO is fully internal and requires no external components.