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STMicroelectronics ST1S15J18R
- Part No.:
- ST1S15J18R
- Manufacturer:
- STMicroelectronics
- Package:
- 6-UFBGA, FCBGA
- Datasheet:
-
ST1S15J18R.pdf
- Description:
- IC REG BCK 1.82V 500MA 6FLIPCHIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,846
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Product details
Overview
ST1S15J18R from STMicroelectronics is a 1.82 V fixed-output, 500 mA synchronous step-down DC-DC converter in Flip Chip 6 package, operating at 6 MHz switching frequency with PFM/PWM mode selection, 45 µA quiescent current, and integrated short-circuit/thermal protection - designed for DSP core supply in space-constrained portable electronics.
For engineers reviewing the ST1S15J18R datasheet, ST1S15J18R pinout, ST1S15J18R application, or ST1S15J18R equivalent, key selection criteria include output voltage accuracy (±2%), load transient response (±50 mV), ultra-low IQ in PFM mode, auto-mode transition thresholds (100–200 mA), and Flip Chip 6 thermal resistance (130 °C/W).
Technical Context
The ST1S15J18R implements a fixed-frequency PWM architecture with automatic PFM fallback below 100 mA load, enabling >80% efficiency at 10 mA and >83% at 150 mA (VIN = 3.6 V, VOUT = 1.82 V). Its internal error amplifier compares FB voltage against 0.6 V reference to regulate output via duty-cycle control of integrated P/N-channel MOSFETs.
Mode selection is hardware-controlled: MODE pin low enables auto PFM/PWM transition; high forces continuous PWM. Soft-start activates on EN assertion or UVLO recovery, limiting inrush current. Undervoltage lockout (2.1 V turn-on, 1.8 V turn-off) and thermal shutdown (125 °C trip, 30 °C hysteresis) ensure robust operation across -40 °C to +85 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 1.82 V ±2% - tightly regulated core voltage for 1.8 V logic domains in DSP/multimedia processors. |
| Max output current | 500 mA - supports full-load operation of low-power application processors without external boost. |
| Switching frequency | 6 MHz (5.4–6.6 MHz) - enables use of 470 nH inductor and 4.7 µF ceramic output capacitor, minimizing board area. |
| Quiescent current | 45 µA (PFM mode) - extends battery life in standby states of mobile devices. |
| Efficiency | 85% typical at 150 mA - reduces thermal dissipation in sealed handheld enclosures. |
| Load transient response | ±50 mV for 50→250 mA step - maintains stable core voltage during processor burst activity. |
| Thermal shutdown | 125 °C junction temperature - protects silicon integrity under sustained overload or poor PCB heat sinking. |
Pinout & Package
ST1S15J18R uses the Flip Chip 6 package: 1.2 mm × 1.2 mm, 0.4 mm height, bottom-side bump terminals, optimized for high thermal conductivity and minimal parasitic inductance in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A2) | High-side switch input & IC power rail | Accepts 2.3–5.5 V input; supplies internal circuitry and drives PFET source; requires local 4.7 µF X5R/X7R decoupling. |
| EN (B2) | Enable control with positive logic | Pull ≥1.2 V to enable; ≤0.4 V to shut down (IQ < 5 µA); no internal pull-up - must be actively driven or tied to VIN. |
| GND (C2) | Power and signal reference ground | Common return for input/output paths and internal regulators; requires low-impedance connection to PCB ground plane. |
| FB (C1) | Feedback voltage sensing node | Monitors output via resistive divider (not needed for fixed-VOUT ST1S15J18R); internal 0.6 V reference sets regulation point. |
| SW (B1) | Switching node | Connects to inductor; carries high di/dt square wave; requires minimized trace length and loop area to reduce EMI. |
| MODE (A1) | Operation mode selection | Low = auto PFM/PWM; high = forced PWM; determines light-load efficiency vs. regulation trade-off; must not float. |
Key Features
| Feature | Design Value |
|---|---|
| 6 MHz fixed-frequency PWM with PFM fallback | Enables use of sub-1 µH inductors and 4.7 µF ceramic capacitors, reducing solution size by >40% vs. 1 MHz converters. |
| Integrated dual-MOSFET power stage | P-channel RDS(on) = 300–400 mΩ and N-channel RDS(on) = 350–450 mΩ minimize conduction loss at 500 mA load. |
| Ultra-fast line/load transient response | ±50 mV deviation for 2.5→3.1 V line step or 50→250 mA load step ensures stable core voltage during processor DVFS transitions. |
| Dedicated MODE pin for PWM/autonomous selection | Allows system-level control over efficiency-regulation balance: forced PWM for noise-sensitive audio subsystems, auto mode for battery runtime optimization. |
| Comprehensive protection suite | Includes undervoltage lockout (2.1 V), thermal shutdown (125 °C), short-circuit current limit (1200 mA), and soft-start - eliminates need for external supervision circuits. |
Applications
| Mobile Baseband Processor Core Supply | DSP Audio Subsystem Power |
|---|---|
|
Use Scenario: Powering ARM9/ARM11 application processor cores in smartphones requiring tight 1.82 V regulation during dynamic frequency scaling. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, low-noise 1.82 V at up to 500 mA with <260 µs startup time after EN assertion. Use Value: Maintains core stability during rapid load transients (±50 mV) while achieving 83% efficiency at 150 mA - extending talk time without thermal throttling. |
Use Scenario: Supplying low-jitter digital audio processing blocks (e.g., CODEC interfaces, FIR filters) in portable media players. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter providing ripple-free 1.82 V rail; forced PWM mode suppresses switching noise near sensitive analog sections. Use Value: Output ripple limited to 10 mV peak-to-peak in PWM mode ensures SNR > 95 dB in 24-bit audio paths without additional LDO post-regulation. |
| PDAs and Handheld Terminals | Wearable Sensor Hub Power |
|
Use Scenario: Power management for legacy PDA platforms with TI OMAP or Intel PXA processors needing 1.8 V core voltage. IC Role / Device Role / Timing Role: Miniaturized step-down converter in Flip Chip 6 package replacing discrete solutions to meet strict board area constraints (<3 mm² total footprint). Use Value: 45 µA quiescent current in PFM mode enables multi-week standby battery life; 130 °C/W RthJA allows operation at 85 °C ambient without derating. |
Use Scenario: Powering always-on motion sensor fusion hubs (accelerometer + gyroscope + MCU) in smartwatches and fitness trackers. IC Role / Device Role / Timing Role: Efficient core supply supporting intermittent burst-mode operation: auto PFM mode minimizes idle current; fast 260 µs wake-up meets sub-millisecond latency requirements. Use Value: Delivers 500 mA peak current for sensor data acquisition bursts while maintaining <5 µA shutdown current - critical for coin-cell battery longevity. |
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 | 1.8 V output, 600 mA, 3 MHz switching, 22 µA IQ - lower frequency requires larger inductor; no dedicated MODE pin. | Lacks hardware-selectable PFM/PWM; relies on internal auto-mode only - less flexibility for noise-sensitive designs. | Prefer when board area allows larger LC filter and system does not require explicit PWM forcing. |
| Analog Devices ADP2119ACPZ-R7 | 1.8 V output, 600 mA, 3 MHz, 30 µA IQ, 1.2 V FB reference - requires external resistor divider for fixed output; no MODE pin. | Fixed output requires external feedback network, increasing component count and layout complexity vs. ST1S15J18R's internal trim. | Choose when design already uses ADI ecosystem or requires adjustable output variants beyond 1.82 V. |
Compared with TPS62231DRYR and ADP2119ACPZ-R7, the ST1S15J18R offers superior transient response (±50 mV vs. ±80–100 mV), smaller solution size due to 6 MHz operation, and direct hardware control of PFM/PWM mode - making it optimal for space- and noise-constrained portable core supplies.
Availability
ST1S15J18R is available at Aetrix Electronics and suitable for mobile baseband processor core supply, DSP audio subsystem power, and wearable sensor hub power requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for ST1S15J18R 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, specializing in power management, microcontrollers, and analog ICs for automotive, industrial, and consumer markets.
The ST1S15 belongs to ST's high-frequency synchronous buck converter product line, engineered specifically for miniaturized, high-efficiency core voltage regulation in battery-powered portable electronics.
FAQ
What is the recommended inductor value and type for ST1S15J18R?
The datasheet specifies 470 nH as the nominal inductor value, with Murata LQM21PNR47MC0D (2.0 × 1.25 × 0.5 mm) validated for optimal performance. The inductor must have saturation current >1.2 A and DCR <100 mΩ to maintain efficiency and avoid thermal stress under 500 mA load.
Can ST1S15J18R operate with input voltage below 2.3 V?
No - the absolute minimum operating input voltage is 2.3 V per electrical characteristics. Below this, undervoltage lockout activates at 2.1 V (rising edge), disabling the device. Operation below 2.3 V risks failure to regulate and violates guaranteed specifications.
Is an external feedback resistor divider required for ST1S15J18R?
No - ST1S15J18R is a factory-trimmed fixed-output variant delivering 1.82 V. The FB pin is internally connected to the 0.6 V reference and output divider; external resistors are unnecessary and would disrupt regulation.
How does the MODE pin affect efficiency and noise performance?
When MODE = low, the device automatically switches between PFM (high efficiency at light loads) and PWM (tight regulation at heavy loads). When MODE = high, it operates exclusively in PWM mode - sacrificing light-load efficiency for lower output ripple (10 mV vs. 30 mV) and predictable switching frequency.
ST1S15J18R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 6-UFBGA, FCBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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)
ST1S15J18R FAQ
1.How can I place an order for ST1S15J18R through Aetrix?
Please submit a Request for Quotation (RFQ) for ST1S15J18R 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 ST1S15J18R reliable?
The price and inventory of ST1S15J18R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1S15J18R is usually 5 days.
3.What payment methods are accepted for ST1S15J18R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1S15J18R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST1S15J18R?
ST1S15J18R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST1S15J18R 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 ST1S15J18R?
For technical support, including ST1S15J18R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1S15J18R requirements.
6.How does Aetrix verify that ST1S15J18R is sourced from the original manufacturer or authorized distributors?
All ST1S15J18R 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 ST1S15J18R meets industry standards.
7.What is the process for return or replacement of ST1S15J18R?
All ST1S15J18R units undergo pre-shipment inspection (PSI). If there is an issue with ST1S15J18R, 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 ST1S15J18R part is unused and in its original packaging.
Return procedure for ST1S15J18R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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