STMicroelectronics ST2S06BPQR

Overview

ST2S06BPQR from STMicroelectronics is a dual synchronous step-down DC-DC converter with inhibit function, operating at 1.5 MHz PWM frequency, delivering up to 0.5 A per channel across 2.5–5.5 V input, with adjustable output voltage starting at 0.8 V and ±2% DC output voltage tolerance. It targets low-voltage digital core power in optical disc drive (ODD) systems.

For engineers reviewing the ST2S06BPQR datasheet, ST2S06BPQR pinout, ST2S06BPQR application, or ST2S06BPQR equivalent, key selection criteria include its dual-channel inhibit-controlled operation, QFN12L (4×4 mm) thermal performance (R_thJA = 60 °C/W), 90% typical efficiency at 100–500 mA load, and dual feedback architecture supporting independent 1.2 V and 3.3 V rail generation.

Technical Context

The ST2S06BPQR implements a constant-frequency current-mode PWM controller with internal NMOS/PMOS synchronous rectifiers (R_DS(on) = 150 mΩ / 200 mΩ typ.), enabling stable regulation using only ceramic capacitors and small inductors. Its dual-loop feedback accepts separate FB1/FB2 inputs for independent output voltage setting via resistor dividers.

Thermal shutdown activates at 130–150 °C with 15 °C hysteresis, and cycle-by-cycle current limiting protects against short-circuit with 1.0–1.2 A switching current limit. The inhibit pin (INH) disables both regulators when pulled below 0.4 V, drawing only 1 µA quiescent current in shutdown mode.

Key Specifications

Pinout & Package

ST2S06BPQR is housed in a thermally enhanced QFN12L (4 × 4 mm, 0.9 mm height) package with exposed thermal pad, rated R_thJC = 10 °C/W and R_thJA = 60 °C/W. Pin 12 (GND_A) serves as system ground reference for analog circuitry, while GND1/GND2 provide dedicated power ground returns for each channel.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.

Compared with TPS65023B and ADP5052, ST2S06BPQR offers minimal external component count (only 2 inductors, 3 caps, 4 resistors), lower system cost, and smaller QFN12L footprint-ideal for space-constrained ODD and portable media applications where fixed dual-rail generation suffices.

Availability

ST2S06BPQR is available at Aetrix Electronics and suitable for optical disc drives, portable media players, set-top boxes, and industrial camera modules requiring stable dual-rail DC-DC conversion with inhibit control and thermal robustness.

Supply support for ST2S06BPQR 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 microcontrollers, power management ICs, sensors, and automotive-grade components since 1987.

The ST2S06 series belongs to ST's high-efficiency DC-DC converter product line, engineered specifically for replacing linear regulators in space- and thermal-constrained consumer electronics like ODDs and portable media devices.

FAQ

What is the function of the HV pin on ST2S06BPQR?

The HV pin is a programming terminal used to trim the internal voltage reference. It must be left floating or connected to GND; applying any voltage or loading it externally will disrupt regulation accuracy. This pin has no active drive capability and is not intended for signal routing or biasing.

Can ST2S06BPQR operate with only one channel enabled?

No-ST2S06BPQR does not support single-channel operation. Both buck regulators are internally coupled through shared bias circuitry and thermal protection. Disabling one channel via feedback disconnection causes instability and violates absolute maximum ratings; the device must regulate both outputs simultaneously.

What is the minimum recommended output capacitor for ST2S06BPQR?

The datasheet specifies 22 µF X5R/X7R ceramic capacitors per output. Using less than 22 µF risks violating load transient response specs (±5% deviation) and may cause instability due to insufficient phase margin. Lower values also increase output ripple beyond the guaranteed 10–15 mV spec under 10–500 mA load steps.

Does ST2S06BPQR support external synchronization of its 1.5 MHz switching frequency?

No-ST2S06BPQR uses an internal oscillator and lacks an external sync input. Its 1.5 MHz frequency is factory-trimmed and varies only with temperature (±0.3 MHz over –50°C to +125°C). For synchronized multi-rail designs, consider ST's ST1S41 or ST2S08 families which include SYNC pins.