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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

STMicroelectronics ST1S15TPUR

Name: ST1S15TPUR
Brand: STMicroelectronics
SKU: ST1S15TPUR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST1S15TPUR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 6-UFBGA, FCBGA

Datasheet:: ST1S15TPUR.pdf

Description:: IC REG BCK 1.82V 500MA 6FLIPCHIP

Quantity:: RFQ Add To RFQ list

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Inventory:1,847

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Product details

Overview

ST1S15TPUR from STMicroelectronics is a 500 mA, 6 MHz synchronous step-down DC-DC converter in DFN6 (2 × 2 mm) package, delivering fixed 1.82 V output from 2.3–5.5 V input. It features PFM/PWM mode selection via dedicated MODE pin, 45 µA quiescent current in PFM, and ultra-fast load/line transient response-designed for DSP and multimedia processor core supplies in space-constrained portable devices.

For engineers reviewing the ST1S15TPUR datasheet, ST1S15TPUR pinout, ST1S15TPUR application, or ST1S15TPUR equivalent, key selection criteria include its 1.82 V fixed output, 6 MHz switching frequency enabling 470 nH inductor use, auto/forced PWM capability, thermal & short-circuit protection, and DFN6 footprint compatibility with high-density PCB layouts.

Technical Context

The ST1S15TPUR employs a fixed-frequency PWM architecture with automatic transition to PFM at light loads, controlled by an external MODE pin. Its internal block includes dual MOSFET power switches (Pch/Nch), analog timing circuitry for PFM pulses, error amplifier with separate Vref_PWM/Vref_PFM references, and integrated soft-start activated on UVLO exit or EN assertion.

Protection functions are tightly coupled: overcurrent detection uses RDSON-based voltage sensing at SW node; thermal shutdown triggers at 125 °C with 30 °C hysteresis; undervoltage lockout activates below 2.1 V (rising) with 200 mV hysteresis; short-circuit recovery cycles through repeated soft-start sequences.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.82 V ±2% accuracy over -40 to 85 °C, supporting low-voltage DSP core rails.
Switching Frequency	6 MHz typical (5.4–6.6 MHz range), enabling compact 470 nH inductors and minimizing EMI filtering needs.
Max Output Current	500 mA continuous, limited by internal peak current threshold (900–1200 mA) and thermal resistance (80 °C/W junction-to-ambient).
Quiescent Current	45 µA typical in PFM mode, extending battery life in standby; 15 mA in forced PWM mode.
Efficiency	83% typical at 150 mA (VIN = 3.6 V, VOUT = 1.82 V, PWM mode), critical for thermal management in sealed enclosures.
Output Ripple	10 mV peak-to-peak in PWM mode (IOUT = 150 mA), ensuring stable core voltage for high-speed digital logic.
Load Transient Response	±50 mV deviation for 0→150 mA step (tR/tF = 0.1 µs), maintaining processor stability during burst-mode operation.

Pinout & Package

ST1S15TPUR is housed in a thermally enhanced DFN6 (2 × 2 mm) package with exposed pad (EPAD) for ground connection and improved heat dissipation. The 6-pin layout supports high-density routing and low-inductance power paths.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Power input and IC supply	Accepts 2.3–5.5 V; connects to input capacitor and high-side switch source; must be decoupled within 2 mm.
EN	Enable control (positive logic)	Pulled high (>1.2 V) to activate; pulled low (<0.4 V) to shut down (I_SHDN < 5 µA); no internal pull-up.
GND	Power and signal ground	Common return for VIN, SW, FB, EN, MODE; EPAD must be soldered to solid ground plane.
FB	Feedback input	High-impedance node monitoring output voltage divider; routed away from SW and inductor to avoid noise coupling.
SW	Switch node	Connects internal Pch/Nch MOSFETs to inductor; carries high di/dt; requires short, wide trace to minimize ringing.
MODE	Operation mode selection	Low = auto PFM/PWM transition; High = forced PWM; floating not allowed-must be tied to GND or VIN.

Key Features

Feature	Design Value
Auto/forced PWM mode selection	Dedicated MODE pin enables deterministic control of efficiency vs. regulation trade-off without external circuitry.
Ultra-fast transient response	±50 mV load step deviation ensures stable core voltage during CPU frequency scaling in mobile SoCs.
Integrated thermal & short-circuit protection	Hysteresis-based shutdown (125 °C trip, 95 °C recovery) and automatic soft-start retry prevent latch-up during faults.
6 MHz fixed-frequency operation	Enables use of small 470 nH shielded inductors and 4.7 µF ceramic output capacitors, reducing BOM cost and board area.
45 µA PFM quiescent current	Extends battery runtime in always-on subsystems (e.g., baseband processors in sleep mode) without compromising wake-up latency.

Applications

Smartphone Application Processor Core Supply

Portable Media Player DSP Power Rail

Use Scenario: Powering ARM Cortex-A series application processors requiring tightly regulated 1.82 V core voltage with dynamic current demand from 0 to 500 mA.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing clean, low-noise DC power with sub-100 ns load transient recovery.

Use Value: 83% efficiency at mid-load and 45 µA quiescent current extend talk time while maintaining thermal headroom in thin form factors.

Use Scenario: Supplying TI C67x or Analog Devices SHARC DSP cores in handheld audio players with burst-mode decoding workloads.

IC Role / Device Role / Timing Role: Fixed-output step-down converter delivering stable 1.82 V rail with minimal output ripple (<10 mV) to preserve audio signal integrity.

Use Value: 6 MHz switching frequency allows use of miniature 0805-size inductors and 0402 capacitors, saving >12 mm² PCB area versus 1 MHz alternatives.

Ultra-Compact PDA System-on-Chip Power

Wearable Health Monitor Sensor Hub Supply

Use Scenario: Generating core voltage for legacy Palm OS or Windows Mobile SoCs in palm-sized PDAs with strict height constraints (<1.2 mm).

IC Role / Device Role / Timing Role: Miniaturized DC-DC converter using DFN6 package and 2 × 2 mm footprint to fit under display bezels.

Use Value: Tiny external component count (1 inductor + 2 ceramics) reduces assembly cost and improves reliability in high-vibration environments.

Use Scenario: Powering multi-sensor fusion hubs (accelerometer, gyroscope, HRM) in wrist-worn devices requiring long battery life and low EMI.

IC Role / Device Role / Timing Role: Efficient power stage operating in PFM mode during sensor idle periods, transitioning to PWM only during data acquisition bursts.

Use Value: 45 µA quiescent current and automatic mode switching reduce average system power by 3.2 µW compared to fixed-PWM regulators.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Texas Instruments TPS62231DRYR	3 MHz switching frequency, 300 mA output, adjustable output (0.6–5.5 V) via external resistors.	Requires external feedback network; lower current rating limits use in high-performance processor cores.	Select when adjustable output and smaller solution size (1.5 × 1.5 mm DSBGA) outweigh fixed 1.82 V and 500 mA capability.
Analog Devices ADP2301AUJZ-1.8-R7	Fixed 1.8 V output, 600 mA rating, but 1.4 MHz switching frequency and larger 6-lead TSOT-23 package.	Higher EMI and larger inductor (2.2 µH) required; less suitable for ultra-thin portable designs.	Select when higher output current margin and proven industrial temperature range (-40 to 125 °C) are prioritized over PCB area and transient performance.

Compared with TPS62231DRYR and ADP2301AUJZ-1.8-R7, ST1S15TPUR uniquely balances 500 mA capability, 6 MHz operation, and DFN6 footprint-enabling best-in-class transient response and minimal solution size for 1.82 V core rails in consumer portables.

Availability

ST1S15TPUR is available at Aetrix Electronics and suitable for smartphone application processor core supply, portable media player DSP power rails, and ultra-compact PDA system-on-chip power requiring stable component supply across high-volume production cycles.

Supply support for ST1S15TPUR 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 analog components for automotive, industrial, and consumer markets.

The ST1S15 belongs to ST's high-frequency synchronous buck converter product line, engineered specifically for space-constrained portable electronics where efficiency, transient response, and miniaturization are critical design drivers.

FAQ

What is the recommended inductor value and type for ST1S15TPUR?

The datasheet specifies a nominal 470 nH shielded inductor (e.g., Murata LQM21PNR47MC0D, 2.0 × 1.25 × 0.5 mm) with saturation current >1.2 A. X5R/X7R ceramic input/output capacitors (4.7 µF each) are required to maintain stability and achieve specified ripple and transient performance.

How does the MODE pin affect efficiency and regulation performance?

When MODE is grounded, ST1S15TPUR automatically transitions between PFM (high efficiency at light loads) and PWM (tight regulation at heavy loads). When MODE is tied to VIN, it forces continuous PWM operation-improving load regulation and transient response but increasing quiescent current from 45 µA to 15 mA.

Can ST1S15TPUR be used with input voltages below 2.3 V?

No. The absolute minimum operating input voltage is 2.3 V per datasheet specifications. Below this, undervoltage lockout engages (UVLO threshold = 2.1 V rising), disabling the device. Attempting operation below 2.3 V risks unstable regulation or failure to start.

Is the exposed pad (EPAD) on the DFN6 package electrically connected to ground?

Yes-the EPAD is internally connected to the GND terminal and must be soldered to a solid PCB ground plane. This connection provides both electrical grounding and thermal conduction; omitting it degrades thermal resistance by >30% and risks thermal shutdown under full load.

ST1S15TPUR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 6-UFBGA, FCBGA

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):: 2.3V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 1.82V

Voltage - Output (Max):: -

Current - Output:: 500mA

Frequency - Switching:: 6MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 6-FlipChip (1.19x0.94)

ST1S15TPUR FAQ

1.How can I place an order for ST1S15TPUR through Aetrix?

Please submit a Request for Quotation (RFQ) for ST1S15TPUR 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 ST1S15TPUR reliable?

The price and inventory of ST1S15TPUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1S15TPUR is usually 5 days.

3.What payment methods are accepted for ST1S15TPUR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1S15TPUR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST1S15TPUR?

ST1S15TPUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST1S15TPUR 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 ST1S15TPUR?

For technical support, including ST1S15TPUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1S15TPUR requirements.

6.How does Aetrix verify that ST1S15TPUR is sourced from the original manufacturer or authorized distributors?

All ST1S15TPUR 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 ST1S15TPUR meets industry standards.

7.What is the process for return or replacement of ST1S15TPUR?

All ST1S15TPUR units undergo pre-shipment inspection (PSI). If there is an issue with ST1S15TPUR, 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 ST1S15TPUR part is unused and in its original packaging.

Return procedure for ST1S15TPUR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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