STMicroelectronics STPMIC1APQR

Overview

STPMIC1APQR from STMicroelectronics is a highly integrated power management IC (PMIC) designed as a companion chip for STM32MP1 microprocessor units. It delivers 4 adaptive COT buck converters (1.2 V, 1.1 V, 3.3 V, 3.3 V), 4 programmable LDOs, DDR termination LDO (sink-source/bypass), USB PHY LDO with auto-source detection, reference LDO for DDR memory, 5.2 V/1.1 A boost converter, and dual 500 mA power switches - all in a single WFQFN-44 package for embedded MPU power rail sequencing and regulation.

For engineers reviewing the STPMIC1APQR datasheet, STPMIC1APQR pinout, STPMIC1APQR application, or STPMIC1APQR equivalent, this device is selected for low-power, high-efficiency system-level power architecture in portable Linux-capable SoC platforms where precise voltage sequencing, I²C-programmable NVM configuration, and multi-rail transient response are critical design requirements.

Technical Context

The STPMIC1APQR implements an advanced adaptive constant-on-time (COT) control architecture across its four buck converters, enabling fast transient response and seamless PFM-to-PWM mode transition for >90% full-load efficiency. Its integrated PLL synchronizes switching frequencies to reduce EMI, while the non-volatile memory stores default output voltages, power-up sequence ranks (Rank0–Rank3), protection thresholds, and I²C slave address - eliminating external configuration components.

It integrates dedicated analog blocks including a DDR VREF generator (VOUT2/2), a sink-source configurable LDO3 for DDR3/DDR4 VTT termination, and a USB PHY LDO with automatic selection between VIN, BSTOUT, or VBUSOTG sources. The boost converter supports bypass mode for direct battery or 5 V adapter input, enabling robust USB host/OTG power delivery without external diode OR-ing.

Key Specifications

Pinout & Package

STPMIC1APQR is housed in a thermally enhanced WFQFN-44L (5 × 6 × 0.8 mm) package with an exposed ePad (EPGND) for improved heat transfer and EMI reduction. Pin assignment follows JEDEC-standard top-view layout with dedicated analog/digital ground separation (AGND, GNDLDO, PGND1–PGND5, EPGND) and strict power domain routing (VIN, BUCKxIN, LDOxxIN, SWIN).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-rail PMIC applications.

Compared with TPS650860A0RSMT and RTQ2134B-QA, STPMIC1APQR uniquely combines DDR3/DDR4 sink-source termination, USB OTG-compliant switching, and factory-programmable NVM - making it the only drop-in solution for STM32MP1-based designs requiring guaranteed boot sequencing and memory interface compliance.

Availability

STPMIC1APQR is available at Aetrix Electronics and suitable for STM32MP1-based industrial HMIs, Linux-capable portable gateways, and smart home hubs requiring stable component supply, long-term lifecycle assurance, and consistent NVM configuration across production batches.

Supply support for STPMIC1APQR 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 microcontrollers, power management, sensors, and automotive ICs - with over 40 years of innovation in energy-efficient silicon solutions.

The STPMIC1 product line was engineered specifically as a scalable, NVM-configurable power companion for STM32MP1 heterogeneous multicore MPUs - targeting high-integration, low-power Linux application processors in industrial, consumer, and IoT edge devices.

FAQ

What is the default power-up sequence rank configuration for STPMIC1APQR?

STPMIC1APQR is pre-programmed as STPMIC1A variant: BUCK1 and BUCK2 are Rank2 (enabled after 10 ms), BUCK3 and BUCK4 are Rank1 and Rank2 respectively, LDO1–LDO6 and REFDDR are Rank0 (not auto-enabled), and LDO3 is configured for normal mode. Sequence timing and rail enable order are stored in NVM and can be modified via I²C.

Does STPMIC1APQR support DDR4 memory termination?

Yes - LDO3 supports sink-source operation with ±120 mARMS continuous current and ±200 mA overcurrent limit, meeting DDR4 VTT termination requirements. Its output tracks VREFDDR (VOUT2/2) and operates down to 1.1 V input, enabling compatibility with DDR4's 1.2 V VDDQ and 0.6 V VREF.

Can the boost converter operate without inductor or external components in bypass mode?

No - bypass mode routes VIN directly to BSTOUT via an internal MOSFET, but external 4.7 µF capacitor (CBSTOUT) is still required for stability and ripple suppression. Inductor (LXB) and catch diode remain unpopulated in bypass, reducing bill-of-materials versus full boost operation.

How is thermal performance managed in the WFQFN-44 package?

The WFQFN-44 exposes a 3.6 mm × 4.6 mm thermal pad (EPGND) that must be soldered to a minimum 200 mm² copper pour with ≥4 thermal vias to internal ground planes. This achieves θ_JA = 29 °C/W on a 2s2p JEDEC board, limiting junction temperature to 125 °C at 1.2 mA typical RUN-mode current and 3.6 V input.