My Inquiry
My Account
STMicroelectronics ST1S06PM33R
- Part No.:
- ST1S06PM33R
- Manufacturer:
- STMicroelectronics
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
ST1S06PM33R.pdf
- Description:
- IC REG BUCK 3.3V 1.5A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,503
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ST1S06PM33R from STMicroelectronics is a fixed-output 3.3 V, 1.5 A synchronous step-down DC-DC converter with 1.5 MHz current-mode PWM control, integrated NMOS/PMOS power switches (RDS(ON) = 120 mΩ / 150 mΩ), and inhibit functionality. It operates from 4.2 V to 5.5 V input, delivers ±2% output voltage tolerance, and targets low-voltage digital core power in HDD and embedded systems.
For engineers reviewing the ST1S06PM33R datasheet, ST1S06PM33R pinout, ST1S06PM33R application, or ST1S06PM33R equivalent, key selection considerations include its fixed 3.3 V output, DFN6 3×3 mm exposed-pad package, thermal shutdown (130–150 °C), 1.5 A continuous load capability, and enable/inhibit logic compatibility with 0.4 V OFF / 1.2–1.3 V ON thresholds.
Technical Context
The ST1S06PM33R implements a constant-frequency current-mode PWM architecture with internal compensation, eliminating external loop components. Its dual-supply design separates analog (VIN_A) and switch (VIN_SW) rails for noise isolation and efficiency optimization.
It integrates cycle-by-cycle current limiting (2.3 A peak), thermal shutdown with 15 °C hysteresis, and soft-start via internal voltage ramp. The inhibit pin (VINH) directly controls switching operation without external logic, supporting system-level power sequencing in compact storage and portable electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% - eliminates external feedback divider, reduces BOM count and layout area. |
| Max Output Current | 1.5 A continuous - supports high-current digital cores (e.g., HDD servo controllers, FPGA I/O banks). |
| Switching Frequency | 1.5 MHz (typ), 1.2–1.8 MHz (min–max) - enables use of ≤3.3 µH inductors and small ceramic capacitors (4.7 µF/22 µF). |
| RDS(ON) (NMOS/PMOS) | 120 mΩ / 150 mΩ at 750 mA - minimizes conduction loss and improves full-load efficiency up to 90%. |
| Input Voltage Range | 4.2 V to 5.5 V - matches regulated 5 V rail applications; excludes dropout below 4.2 V to maintain regulation. |
| Quiescent Current | 1.5 mA (active), 1 µA (inhibited) - extends battery life in standby modes for portable storage devices. |
| Thermal Shutdown | 130–150 °C junction - protects against sustained overload or poor PCB thermal design in sealed enclosures. |
Pinout & Package
ST1S06PM33R is housed in a thermally enhanced DFN6 3×3 mm package with an exposed pad soldered to PCB ground for optimal heat dissipation (RthJA = 55 °C/W, RthJC = 10 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB/VO) | Feedback / Output Sense | Fixed 3.3 V output node - internally connected to error amplifier reference; no external resistor required. |
| 2 (GND) | System Ground | Main return path for analog, power, and exposed pad - must be low-impedance copper pour for stability and thermal performance. |
| 3 (SW) | Switch Node | Drain connection of internal NMOS/PMOS pair - routes high di/dt switching current; requires tight layout to minimize EMI. |
| 4 (VIN_SW) | Switch-Side Power Supply | Supplies gate drive and high-side switch - decoupled separately from VIN_A to reduce noise coupling into control circuitry. |
| 5 (VIN_A) | Analog-Side Power Supply | Powers error amplifier, PWM comparator, and bias circuits - improves PSRR and regulation accuracy under dynamic load. |
| 6 (VINH) | Inhibit Control Input | Active-high enable: ≥1.2 V turns on regulator; ≤0.4 V forces shutdown - compatible with 3.3 V GPIO or open-drain logic. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated NMOS/PMOS power stage eliminates external Schottky diode, reducing conduction loss and board area. |
| Internal soft-start | Voltage-ramp generator limits inrush current during startup - prevents input rail sag and output overshoot. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and stable operation with ceramic output capacitors (no ESR requirement). |
| Thermal protection | Auto-recovery shutdown at 130–150 °C junction temperature - prevents permanent damage during transient overloads. |
| Dual supply inputs (VIN_SW/VIN_A) | Separates noisy switch-node power from sensitive analog circuitry - improves line/load regulation and noise immunity. |
Applications
| HDD Digital Core Power | Portable SSD Power Management |
|---|---|
|
Use Scenario: Powering 3.3 V digital logic blocks (e.g., servo controller, interface ASIC) in 2.5-inch hard disk drives. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 3.3 V from 5 V bus with fast transient response to bursty data access loads. Use Value: 90% efficiency at 1.5 A reduces thermal load in confined drive enclosures; inhibit pin enables firmware-controlled power gating during idle. |
Use Scenario: Supplying 3.3 V to NAND flash I/O and controller in battery-powered solid-state drives. IC Role / Device Role / Timing Role: High-efficiency buck converter with ultra-low quiescent current (1 µA in inhibit mode) extending standby time. Use Value: Fixed 3.3 V output eliminates feedback resistors, saving PCB space; DFN6 package supports dense, low-profile SSD layouts. |
| Industrial Sensor Hub Power | Embedded Network Interface Module |
|
Use Scenario: Providing clean 3.3 V power to mixed-signal sensor fusion processors in factory automation nodes. IC Role / Device Role / Timing Role: Regulator with tight line/load regulation (±0.3%) and low output ripple for ADC reference stability. Use Value: Dual supply rails (VIN_SW/VIN_A) suppress switching noise coupling into analog signal chains, improving measurement accuracy. |
Use Scenario: Powering Ethernet PHY and microcontroller I/O in compact industrial Ethernet modules. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC solution meeting EN 55022 Class B EMI requirements via 1.5 MHz fixed frequency. Use Value: Exposed-pad DFN6 package enables direct thermal coupling to heatsink or ground plane - sustains 1.5 A output at 85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS561201 | 3.3 V fixed, 1.2 A max, 600 kHz switching, single-supply (VIN only), no inhibit pin | Limited current headroom for 1.5 A HDD loads; lower frequency requires larger L/C | Choose if cost-sensitive and load never exceeds 1.2 A; avoid where inhibit control or thermal margin is critical. |
| Analog Devices ADP2303 | 3.3 V fixed, 3 A max, 700 kHz, single-supply, no inhibit, higher RDS(ON) (220 mΩ) | Over-spec'd current but lower efficiency at 1.5 A due to higher conduction loss | Prefer when future-proofing for >1.5 A loads is needed; accept 5–8% lower efficiency and larger passive footprint. |
Compared with TPS561201 and ADP2303, ST1S06PM33R uniquely balances 1.5 A capability, 1.5 MHz operation, dual supply rails, and inhibit control in a 3×3 mm DFN - making it optimal for space-constrained, thermally sensitive 3.3 V digital core applications requiring precise sequencing.
Availability
ST1S06PM33R is available at Aetrix Electronics and suitable for HDD digital core power, portable SSD power management, industrial sensor hub power, and embedded network interface module applications requiring stable component supply across extended temperature ranges (−30 °C to 125 °C).
Supply support for ST1S06PM33R 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 ICs, sensors, and analog solutions for automotive, industrial, and consumer markets.
The ST1S06 series belongs to ST's high-efficiency DC-DC converter product line, engineered specifically for replacing linear regulators in high-current, low-voltage digital core applications where thermal management and board space are critical constraints.
FAQ
What input voltage range is supported by ST1S06PM33R?
The ST1S06PM33R operates with a minimum input voltage of 4.2 V and a maximum of 5.5 V. This range ensures stable 3.3 V regulation across typical 5 V rail tolerances (±10%), and is validated per Table 6 in the datasheet for VO = 3.3 V operation. Operation below 4.2 V may cause dropout or regulation failure.
Does ST1S06PM33R require external feedback resistors?
No. ST1S06PM33R is a fixed-output variant with internal feedback set to 3.3 V. Pin 1 (FB/VO) is the output voltage node, not a feedback input - eliminating external resistors and associated layout sensitivity. This differs from adjustable versions like ST1S06PM12 or ST1S06APM.
How does the inhibit function behave electrically?
VINH (Pin 6) is a logic-compatible inhibit input: device enables when VINH ≥ 1.2 V (typical threshold at VI = 4.2–5.5 V), and disables when VINH ≤ 0.4 V. Inhibited quiescent current drops to 1 µA (TJ = −30 to 85 °C), and switching ceases immediately without soft-stop delay.
Can ST1S06PM33R be used with ceramic output capacitors?
Yes. Its current-mode PWM architecture and internal compensation are optimized for low-ESR ceramic capacitors (X5R/X7R). The datasheet specifies 22 µF output capacitance with typical ESR < 10 mΩ, ensuring stable regulation and ≤±5% load transient response (IO = 100–750 mA).
ST1S06PM33R 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):
- 4.2V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 3.3V
- 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)
ST1S06PM33R FAQ
1.How can I place an order for ST1S06PM33R through Aetrix?
Please submit a Request for Quotation (RFQ) for ST1S06PM33R 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 ST1S06PM33R reliable?
The price and inventory of ST1S06PM33R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1S06PM33R is usually 5 days.
3.What payment methods are accepted for ST1S06PM33R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1S06PM33R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST1S06PM33R?
ST1S06PM33R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST1S06PM33R 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 ST1S06PM33R?
For technical support, including ST1S06PM33R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1S06PM33R requirements.
6.How does Aetrix verify that ST1S06PM33R is sourced from the original manufacturer or authorized distributors?
All ST1S06PM33R 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 ST1S06PM33R meets industry standards.
7.What is the process for return or replacement of ST1S06PM33R?
All ST1S06PM33R units undergo pre-shipment inspection (PSI). If there is an issue with ST1S06PM33R, 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 ST1S06PM33R part is unused and in its original packaging.
Return procedure for ST1S06PM33R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ST1S06PM33R Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
