STMicroelectronics ST1S06PMR

Overview

ST1S06PMR from STMicroelectronics is a synchronous step-down DC-DC converter IC optimized for low-voltage digital core power in HDD systems, featuring 1.5 MHz fixed-frequency current-mode PWM control, 1.5 A output capability, 2% output voltage tolerance, and integrated NMOS/PMOS power switches with R_DS(ON) of 120 mΩ / 150 mΩ. It operates from 2.7 V to 6 V input and supports adjustable output via external resistor divider.

For engineers reviewing the ST1S06PMR datasheet, ST1S06PMR pinout, ST1S06PMR application, or ST1S06PMR equivalent, key selection criteria include its DFN6 3×3 mm thermally enhanced package, inhibit-controlled enable/disable functionality, internal soft-start, thermal shutdown (130–150°C), and compatibility with low-ESR ceramic capacitors for minimal output ripple in space-constrained designs.

Technical Context

The ST1S06PMR implements a constant-frequency current-mode PWM architecture with cycle-by-cycle overcurrent protection and thermal shutdown. Its dual-supply design separates analog (VIN_A) and switch (VIN_SW) rails to improve noise immunity and regulation stability under dynamic load conditions.

Feedback is referenced to an internal 800 mV precision bandgap (±24 mV), enabling accurate output setting across temperature (−30°C to 125°C). The inhibit pin (VINH) provides TTL-compatible logic-level control with 1.2 V turn-on threshold and <2 µA bias current, supporting low-power system sequencing.

Key Specifications

Pinout & Package

ST1S06PMR is housed in a thermally enhanced DFN6 3×3 mm package with exposed pad (connected to GND), offering 10°C/W junction-to-case thermal resistance and 55°C/W junction-to-ambient rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down DC-DC converter applications.

Compared with TPS62130ARGTR and MP2315DJ-LF-Z, the ST1S06PMR uniquely combines dual-supply rail separation, integrated synchronous switches, and a dedicated inhibit pin-making it optimal for thermally constrained, noise-sensitive HDD and FPGA power delivery where reliability and sequencing control are mandatory.

Availability

ST1S06PMR is available at Aetrix Electronics and suitable for hard disk drive controller power, FPGA I/O regulation, and USB-powered embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed DFN6 3×3 mm package consistency.

Supply support for ST1S06PMR 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The ST1S06 belongs to ST's high-efficiency DC-DC converter product line, engineered specifically for replacing linear regulators in space- and thermal-constrained digital core power applications such as storage controllers and programmable logic devices.

FAQ

What input voltage range does the ST1S06PMR support?

The ST1S06PMR operates from 2.7 V to 6 V on both VIN_SW and VIN_A pins. Input voltage must remain within this range under all load and temperature conditions; exceeding 6 V risks permanent damage per absolute maximum ratings. For 3.3 V system rails, it delivers up to 1.5 A at 1.2 V output with >80% efficiency.

How is output voltage set on the ST1S06PMR?

Output voltage is set externally using a resistor divider from VO to GND, with the FB/VO pin connected to the divider midpoint. The formula is VO = 0.8 V × (1 + R1/R2), where R2 connects to GND. For example, R1 = 10 kΩ and R2 = 4 kΩ yields 2.8 V output. Fixed-output variants (e.g., ST1S06PM12R) omit the divider.

Does the ST1S06PMR require external compensation components?

No-ST1S06PMR features internal compensation optimized for ceramic output capacitors (4.7 µF–22 µF) and 3.3 µH inductors. Adding external compensation risks instability. Layout best practices include short SW trace, solid GND plane under exposed pad, and separate VIN_A/VIN_SW decoupling (1 µF ceramic each).

What thermal management considerations apply to the DFN6 3×3 mm package?

The DFN6 package requires the exposed pad to be soldered to a minimum 100 mm² copper thermal pad on the PCB, connected to GND via ≥4 thermal vias (0.3 mm diameter). Without this, junction temperature may exceed 125°C at 1.5 A load. Thermal resistance drops from 55°C/W (no pad) to ~35°C/W with proper layout.