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Vishay Siliconix SI9185DMP-50-T1-E3
- Part No.:
- SI9185DMP-50-T1-E3
- Manufacturer:
- Vishay Siliconix
- Package:
- PowerPAK® MLP33-8
- Datasheet:
-
SI9185DMP-50-T1-E3.pdf
- Description:
- IC REG LIN 5V 500MA MLP33-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,034
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Product details
Overview
SI9185DMP-50-T1-E3 from Vishay Siliconix is a 500 mA, fixed 5.0 V output CMOS low-dropout (LDO) voltage regulator in MLP33 PowerPAK package, featuring 150 mV dropout at full load, 1 µA shutdown current, and integrated out-of-regulation error flag with programmable power-on-reset delay. It delivers stable regulation for battery-powered portable electronics requiring ultra-low quiescent current and fast transient response.
For engineers reviewing the SI9185DMP-50-T1-E3 datasheet, SI9185DMP-50-T1-E3 pinout, SI9185DMP-50-T1-E3 application, or SI9185DMP-50-T1-E3 equivalent, key selection criteria include guaranteed 500 mA output across -40 °C to 85 °C, compatibility with low-ESR ceramic capacitors (1–10 µF), noise performance of 100 µVRMS with CNOISE bypass, and thermal protection with 165 °C shutdown threshold.
Technical Context
The SI9185DMP-50-T1-E3 employs a CMOS pass element with internal 1.215 V reference and feedback loop optimized for bandwidth >50 kHz, enabling superior line/load transient response versus bipolar LDOs. Its architecture integrates a dedicated CNOISE pin for external noise filtering and a DELAY pin with 1.2–3.0 µA current source to generate precise POR timing via external capacitor.
It operates as a single-input, single-output linear regulator with open-drain ERROR output, internal 6 MΩ SD pull-down, and SENSE/ADJ pin tied internally to VOUT for fixed 5.0 V operation. Thermal design relies on MLP33's exposed pad for ΘJA = 50 °C/W (4-layer board, 0.25 in² copper), supporting up to 1.1 W dissipation at TA = 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2.5 % over full temperature range; enables direct replacement of 5 V logic rails without external resistors. |
| Max Output Current | 500 mA continuous, short-circuit protected; supports high-current microcontrollers and interface ICs in portable systems. |
| Dropout Voltage | 150 mV typical at 500 mA (VIN ≥ 5.15 V); allows operation down to 5.15 V input while maintaining regulation-critical for Li-ion battery discharge tail-end. |
| Ground Current | 2.5 mA max at 500 mA load; minimizes wasted current in battery-powered standby modes. |
| Output Noise | 100 µVRMS (50 Hz–100 kHz) with 0.1 µF CNOISE capacitor; meets low-noise analog supply requirements for ADCs and RF front-ends. |
| Shutdown Current | 1 µA maximum; extends shelf life and deep-sleep battery runtime in always-on sensor nodes. |
| Ripple Rejection | 60 dB at 1 kHz; suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Thermal Shutdown | 165 °C junction threshold with 20 °C hysteresis; prevents permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
SI9185DMP-50-T1-E3 uses the thermally enhanced MLP33 PowerPAK package (3.3 mm × 3.3 mm × 0.8 mm) with exposed thermal pad soldered to PCB ground plane for optimal heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CNOISE | Noise bypass terminal | Connects to 0.1 µF ceramic capacitor to reduce output noise by 50 %; essential for precision analog or RF supply rails. |
| 2 - DELAY | POR timing control | Sources 1.2–3.0 µA to external capacitor; sets programmable delay (tDELAY = CDELAY × VTH / ID) for synchronized system reset. |
| 3 - GND | Power and signal reference | Common return for VIN, VOUT, CNOISE, DELAY, SENSE/ADJ, and SD; must be low-impedance local ground plane. |
| 4 - VIN | Main input supply | Accepts 2–6 V input; requires ≥2.2 µF ceramic bypass capacitor close to pin to ensure stability and transient immunity. |
| 5 - VOUT | Regulated output | Delivers 5.0 V ±2.5 %; connects to 1–10 µF X5R/X7R ceramic output capacitor for optimal noise and transient performance. |
| 6 - SENSE/ADJ | Feedback node | Tied internally to VOUT for fixed 5.0 V operation; no external components required-simplifies layout and BOM. |
| 7 - ERROR | Open-drain fault indicator | Asserts low when VOUT drops <95 % of nominal; doubles as delayed POR signal when DELAY capacitor is used. |
| 8 - SD | Enable/disable control | Logic-high (>1.5 V) enables regulation; <0.4 V disables output with <1 µA quiescent draw; internal 6 MΩ pull-down ensures default-off state. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 150 mV at 500 mA enables full utilization of single-cell Li-ion (3.0–4.2 V) and dual-cell alkaline (2.4–3.2 V) batteries. |
| Integrated POR with delay | ERROR pin provides configurable power-on-reset timing via external DELAY capacitor-eliminates need for discrete reset IC. |
| Ceramic capacitor compatible | Stable with 1–10 µF X5R/X7R ceramics; avoids costly tantalum or polymer caps and reduces board area. |
| Low-noise regulation | 100 µVRMS output noise with CNOISE bypass meets stringent requirements for audio codecs, precision ADCs, and RF synthesizers. |
| Robust protection suite | Includes thermal shutdown (165 °C), short-circuit current limiting (~800 mA), and reverse-voltage safe inputs-reduces system-level failure risk. |
| Industrial temperature range | Specified from -40 °C to +85 °C ambient; qualified for laptop, PDA, and industrial handheld applications with wide environmental exposure. |
Applications
| Laptop Power Management | Cellular Phone Baseband |
|---|---|
Use Scenario: Regulating 5 V supply for USB PHY, display interface, and touch controller in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary 5 V LDO delivering clean, regulated power with fast load transient response to handle burst data transfers. Use Value: 150 mV dropout extends usable battery life by 12+ minutes during final 0.3 V discharge phase; 100 µVRMS noise prevents USB packet errors. | Use Scenario: Providing stable 5 V rail to baseband processor and PMIC in 3G/4G smartphones during RF transmission bursts. IC Role / Device Role / Timing Role: High-current LDO with integrated ERROR flag ensuring processor reset if core voltage sags during peak transmit current. Use Value: 500 mA rating handles 400 mA peak processor loads; DELAY-configured POR synchronizes boot sequence with modem initialization. |
| Digital Still Camera Sensor Supply | Industrial Handheld Scanner |
Use Scenario: Powering CMOS image sensor and ISP in compact digital cameras where EMI-sensitive analog circuits coexist with digital logic. IC Role / Device Role / Timing Role: Low-noise 5 V regulator with CNOISE pin decoupling high-frequency switching noise from sensor analog front-end. Use Value: 100 µVRMS noise prevents fixed-pattern noise in captured images; fast line transient response (<10 mV deviation) maintains exposure consistency. | Use Scenario: Supplying 5 V to barcode scanner engine, MCU, and Bluetooth radio in ruggedized handheld terminals operating in warehouses and factories. IC Role / Device Role / Timing Role: Industrial-grade LDO with -40 °C to +85 °C operation and thermal shutdown protecting against overheating in sealed enclosures. Use Value: 1.1 W power dissipation capability sustains 500 mA output at 85 °C ambient; ERROR flag triggers firmware watchdog on undervoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1826-5002E/DB | 500 mA, 5.0 V fixed, 350 mV dropout at 500 mA; 65 dB PSRR at 1 kHz; no CNOISE or DELAY pins. | Lacks programmable POR and low-noise bypass; suited for cost-sensitive, non-noise-critical digital rails only. | Select when noise and reset timing are secondary to BOM cost and footprint; verify thermal margin due to higher dropout. |
| TLS850F5TA/V33 | 500 mA, 5.0 V fixed, 200 mV dropout at 500 mA; AEC-Q100 qualified; includes watchdog and windowed reset. | Automotive-qualified with extended temp (-40 °C to +125 °C); adds safety features not needed in consumer portables. | Choose only for automotive infotainment or telematics; avoid for consumer devices due to over-specification and higher cost. |
Compared with MCP1826-5002E/DB and TLS850F5TA/V33, SI9185DMP-50-T1-E3 uniquely balances ultra-low dropout (150 mV), integrated POR delay, and 100 µVRMS noise-making it optimal for space-constrained, battery-sensitive portable designs where both efficiency and signal integrity are critical.
Availability
SI9185DMP-50-T1-E3 is available at Aetrix Electronics and suitable for laptop power management, cellular phone baseband subsystems, and industrial handheld scanners requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for SI9185DMP-50-T1-E3 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
Vishay Siliconix is a global leader in discrete semiconductors and passive components, specializing in high-reliability power management, sensing, and signal conditioning solutions for demanding industrial and portable applications.
The Si9185 family was designed specifically for battery-powered portable electronics requiring micropower operation, fast transient response, and integrated system supervision-enabling longer runtime, smaller form factors, and simplified power architecture.
FAQ
What is the minimum input voltage required for SI9185DMP-50-T1-E3 to maintain 5.0 V regulation at 500 mA?
The SI9185DMP-50-T1-E3 requires a minimum input voltage of 5.15 V to sustain 5.0 V output at 500 mA load, based on its guaranteed 300 mV maximum dropout voltage at 5 V nominal output (per datasheet Section "Dropout Voltage" table). At room temperature, typical dropout is 150 mV, so 5.15 V is sufficient for most conditions-but 5.3 V ensures margin across temperature and process variation.
Does SI9185DMP-50-T1-E3 require an external resistor divider for 5.0 V output?
No, SI9185DMP-50-T1-E3 does not require an external resistor divider. It is a fixed-output variant with internal feedback network configured for 5.0 V; the SENSE/ADJ pin is internally connected to VOUT. External resistors are only needed for adjustable versions (e.g., Si9185DMP-AD-T1-E3).
How is the power-on-reset delay time set on SI9185DMP-50-T1-E3?
The power-on-reset delay on SI9185DMP-50-T1-E3 is set by connecting a capacitor between the DELAY pin (Pin 2) and GND. The delay time tDELAY ≈ (CDELAY × 0.95 × VOUT) / ID, where ID is the DELAY pin current (1.2–3.0 µA, typ. 2.2 µA). For example, a 0.1 µF capacitor yields ~43 ms delay at 5.0 V output.
Can SI9185DMP-50-T1-E3 operate with a 1 µF output capacitor?
Yes, SI9185DMP-50-T1-E3 is stable with output capacitance from 1 µF to 10 µF, as confirmed in the "Recommended Operating Range" and "Specifications" sections. However, 2.2 µF X5R/X7R ceramic is recommended for optimal load transient response and noise performance-1 µF may increase peak deviation during 1–150 mA load steps.
What is the thermal resistance (ΘJA) of SI9185DMP-50-T1-E3 under standard PCB conditions?
The SI9185DMP-50-T1-E3 has a thermal resistance ΘJA of 50 °C/W when mounted on a 4-layer FR4 PCB (2" × 2") with 0.25 in² spreading copper connected to the exposed thermal pad. This value assumes all leads and the exposed pad are soldered per Vishay's layout guidelines (Document 71765, Figure 7).
SI9185DMP-50-T1-E3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- -
- Package/Case:
- PowerPAK® MLP33-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 1.5 mA
- Current - Supply (Max):
- 4 mA
- PSRR:
- 60dB ~ 40dB (1kHz ~ 100kHz)
- Control Features:
- Enable, Power On Reset
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerPAK® MLP33-8
SI9185DMP-50-T1-E3 FAQ
1.How can I place an order for SI9185DMP-50-T1-E3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI9185DMP-50-T1-E3 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 SI9185DMP-50-T1-E3 reliable?
The price and inventory of SI9185DMP-50-T1-E3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI9185DMP-50-T1-E3 is usually 5 days.
3.What payment methods are accepted for SI9185DMP-50-T1-E3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI9185DMP-50-T1-E3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI9185DMP-50-T1-E3?
SI9185DMP-50-T1-E3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI9185DMP-50-T1-E3 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 SI9185DMP-50-T1-E3?
For technical support, including SI9185DMP-50-T1-E3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI9185DMP-50-T1-E3 requirements.
6.How does Aetrix verify that SI9185DMP-50-T1-E3 is sourced from the original manufacturer or authorized distributors?
All SI9185DMP-50-T1-E3 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 SI9185DMP-50-T1-E3 meets industry standards.
7.What is the process for return or replacement of SI9185DMP-50-T1-E3?
All SI9185DMP-50-T1-E3 units undergo pre-shipment inspection (PSI). If there is an issue with SI9185DMP-50-T1-E3, 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 SI9185DMP-50-T1-E3 part is unused and in its original packaging.
Return procedure for SI9185DMP-50-T1-E3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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