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STMicroelectronics ST1S06PM12R
- Part No.:
- ST1S06PM12R
- Manufacturer:
- STMicroelectronics
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
ST1S06PM12R.pdf
- Description:
- IC REG BUCK 1.2V 1.5A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,329
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Product details
Overview
ST1S06PM12R from STMicroelectronics is a synchronous step-down DC-DC switching regulator with adjustable output (1.2 V fixed version), 1.5 A output current, 1.5 MHz fixed-frequency current-mode PWM control, and integrated NMOS/PMOS power switches in DFN6 3×3 mm package. It delivers high efficiency (>85% at 100 mA–1.5 A, VO = 1.2 V) for low-voltage digital core power in HDD and embedded systems.
For engineers reviewing the ST1S06PM12R datasheet, ST1S06PM12R pinout, ST1S06PM12R application, or ST1S06PM12R equivalent, key selection considerations include its 1.2 V fixed output, inhibit-controlled enable/disable functionality, thermal shutdown (130–150 °C), low quiescent current (1.5 mA active, 1 µA shutdown), and compatibility with ceramic input/output capacitors and small 3.3 µH inductors.
Technical Context
The ST1S06PM12R implements a constant-frequency current-mode PWM architecture with internal compensation, enabling stable regulation using only external ceramic capacitors and a single inductor. Its dual-supply inputs-VIN_SW (switch driver) and VIN_A (analog circuit)-allow independent biasing for improved noise immunity and efficiency across load transients.
It integrates cycle-by-cycle overcurrent protection (2.3 A switch current limit), thermal shutdown with 15 °C hysteresis, and soft-start via internal voltage ramp to prevent inrush current. The inhibit pin (VINH) provides logic-level enable/disable control with 1.2–1.3 V turn-on threshold and sub-µA leakage in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±2% (guaranteed by internal feedback reference of 1.200 V, min/max 1.176/1.224 V) |
| Switching Frequency | 1.5 MHz typical (range 1.2–1.8 MHz); enables use of compact 3.3 µH inductors and 4.7 µF/22 µF ceramic caps |
| Output Current | 1.5 A continuous (limited by internal NMOS/PMOS RDS(ON) = 0.12 Ω / 0.15 Ω and thermal design) |
| Efficiency | 80–85% at 100 mA–1.5 A load (VO = 1.2 V); >90% achievable at VO = 3.3 V per PM33 variant |
| Quiescent Current | 1.5 mA (active mode, VINH > 1.2 V); drops to 1 µA in inhibit-off state (TJ = −30 to +85 °C) |
| Operating Input Range | 2.7 V to 5.5 V (minimum VI for full 1.5 A output; supports single-cell Li-ion or 3.3 V rail inputs) |
| Junction Temp Range | −30 °C to +125 °C continuous operation; thermal shutdown activates at 130–150 °C |
Pinout & Package
ST1S06PM12R is housed in a thermally enhanced DFN6 (3 × 3 mm, 0.75 mm height) package with exposed thermal pad soldered to PCB ground for optimal heat dissipation (RthJC = 10 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB/VO) | Feedback / Output Sense | Fixed 1.2 V output node - internally connected to regulated output; no external divider required |
| 2 | GND | System ground reference for analog and power sections; must connect to exposed thermal pad |
| 3 | SW | Switch node between internal NMOS and PMOS; connects externally to inductor and output capacitor |
| 4 | VIN_SW | Power supply for internal MOSFET gate drivers; decoupled separately for EMI reduction |
| 5 | VIN_A | Power supply for internal analog circuitry (error amp, PWM comparator, reference); low-noise bias path |
| 6 | VINH | Inhibit control input; device disabled when < 0.4 V, enabled when > 1.2 V (TTL/CMOS compatible) |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated NMOS (0.12 Ω) and PMOS (0.15 Ω) power switches eliminate external diode, improving efficiency by ~5–10% vs. asynchronous designs |
| Internal soft-start | On-chip voltage ramp generator prevents output overshoot and limits inrush current during power-up |
| Thermal & current protection | Auto-shutdown at junction temp > 130 °C with 15 °C hysteresis; cycle-by-cycle current limiting at 2.3 A peak switch current |
| Low-ESR ceramic support | Stable with X5R/X7R MLCCs at input/output; eliminates need for electrolytic or tantalum capacitors |
| Dual-input power rails | Separate VIN_SW and VIN_A supplies reduce coupling between power-switch noise and analog control circuitry |
Applications
| HDD Digital Core Power | Portable SSD Power Management |
|---|---|
Use Scenario: Powering 1.2 V digital core logic (e.g., ASIC, controller, flash interface) in 2.5″ hard disk drives where thermal density and board space are constrained. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 1.2 V from 5 V SATA rail; operates continuously under variable load (10 mA–1.5 A). Use Value: Enables compact layout with 3.3 µH inductor and 22 µF ceramic output cap; >85% efficiency reduces thermal load on drive PCB. | Use Scenario: Supplying 1.2 V core voltage to NAND flash controllers and DRAM buffers in battery-powered portable SSD enclosures. IC Role / Device Role / Timing Role: Main DC-DC converter powered from USB 5 V or single-cell Li-ion (2.7–5.5 V input range); supports dynamic load steps during read/write bursts. Use Value: Inhibit pin allows host MCU to disable regulator during sleep, reducing system standby current to <1 µA. |
| Industrial IoT Sensor Hub | Embedded FPGA I/O Bank Supply |
Use Scenario: Providing clean, efficient 1.2 V power to ARM Cortex-M microcontrollers and RF SoCs in sealed industrial sensor nodes operating at −30 °C to +85 °C ambient. IC Role / Device Role / Timing Role: Fixed-output buck regulator with wide input range and robust thermal protection; used alongside LDOs for mixed-rail systems. Use Value: −30 °C to +125 °C junction rating ensures reliability in unventilated enclosures; 1.5 MHz switching avoids audible noise and simplifies EMI filtering. | Use Scenario: Generating 1.2 V supply for FPGA I/O banks requiring tight voltage tolerance (±2%) and fast transient response in programmable logic modules. IC Role / Device Role / Timing Role: High-current, low-ripple DC-DC source with <±5% load transient deviation (100 mA → 750 mA step); complements FPGA power sequencing requirements. Use Value: Current-mode PWM + ceramic caps deliver predictable ripple (<15 mVpp typical), supporting signal integrity in high-speed I/O interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62130ARGTR | 1.2 V fixed, 3 A output, 2.5 MHz switching, integrated compensation, but requires external soft-start capacitor | Higher current and frequency; better suited for compact, high-density layouts needing >1.5 A | Select if higher output current headroom or faster transient response is required; verify thermal margin with 3 A capability |
| Analog Devices ADP2302ARDZ-1.2-R7 | 1.2 V fixed, 2 A output, 600 kHz switching, requires external compensation network and soft-start components | Lower frequency enables larger inductors; less sensitive to PCB layout parasitics than 1.5 MHz designs | Prefer for cost-sensitive, lower-EMI applications where board area is less constrained and 600 kHz operation is acceptable |
Compared with TPS62130ARGTR and ADP2302ARDZ-1.2-R7, the ST1S06PM12R offers balanced performance: mid-range current (1.5 A), optimized 1.5 MHz frequency for size/efficiency trade-off, fully integrated soft-start and compensation, and lowest BOM count among the three - ideal for space-constrained HDD and portable storage designs.
Availability
ST1S06PM12R is available at Aetrix Electronics and suitable for HDD digital core power, portable SSD power management, industrial IoT sensor hubs, and embedded FPGA I/O bank supply requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ST1S06PM12R 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, power, and embedded applications.
The ST1S06 product line targets high-efficiency, space-constrained DC-DC conversion in storage and portable electronics, emphasizing integration (internal switches, compensation, soft-start), thermal resilience, and compatibility with low-ESR ceramic capacitors.
FAQ
What input voltage range supports full 1.5 A output current?
The ST1S06PM12R delivers its rated 1.5 A output current across an input voltage range of 2.7 V to 5.5 V. Below 2.7 V, output current capability degrades due to insufficient headroom for the internal NMOS/PMOS switches and control circuitry; operation below 2.7 V is not guaranteed per datasheet specifications.
Can ST1S06PM12R operate without an external inductor?
No - the ST1S06PM12R is a synchronous buck converter requiring an external power inductor (e.g., 3.3 µH) connected between the SW pin and output capacitor. The inductor stores energy during the switch-on phase and releases it during the off-phase; omitting it would cause immediate failure due to uncontrolled current flow and lack of energy transfer.
Is the exposed thermal pad electrically isolated?
No - the exposed thermal pad on the DFN6 package is internally connected to GND (Pin 2) and must be soldered to a PCB ground plane for both thermal performance and electrical stability. Leaving it floating or connecting it to another net violates the recommended layout and risks thermal runaway or regulation instability.
Does ST1S06PM12R require external compensation components?
No - the ST1S06PM12R features fully internal compensation, eliminating the need for external RC networks or type-II/type-III compensators. This simplifies design, reduces BOM count, and improves consistency across production units, as confirmed in the "Typical Application" section (page 13) of the datasheet.
ST1S06PM12R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 6-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -30°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (3x3)
ST1S06PM12R FAQ
1.How can I place an order for ST1S06PM12R through Aetrix?
Please submit a Request for Quotation (RFQ) for ST1S06PM12R on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ST1S06PM12R reliable?
The price and inventory of ST1S06PM12R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1S06PM12R is usually 5 days.
3.What payment methods are accepted for ST1S06PM12R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1S06PM12R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST1S06PM12R?
ST1S06PM12R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST1S06PM12R order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ST1S06PM12R?
For technical support, including ST1S06PM12R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1S06PM12R requirements.
6.How does Aetrix verify that ST1S06PM12R is sourced from the original manufacturer or authorized distributors?
All ST1S06PM12R products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ST1S06PM12R meets industry standards.
7.What is the process for return or replacement of ST1S06PM12R?
All ST1S06PM12R units undergo pre-shipment inspection (PSI). If there is an issue with ST1S06PM12R, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ST1S06PM12R part is unused and in its original packaging.
Return procedure for ST1S06PM12R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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