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Vishay Siliconix SI9185DMP-12-T1-E3
- Part No.:
- SI9185DMP-12-T1-E3
- Manufacturer:
- Vishay Siliconix
- Package:
- PowerPAK® MLP33-8
- Datasheet:
-
SI9185DMP-12-T1-E3.pdf
- Description:
- IC REG LIN 1.2V 500MA MLP33-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,212
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Product details
Overview
SI9185DMP-12-T1-E3 from Vishay Siliconix is a micropower 500 mA CMOS low-dropout (LDO) voltage regulator with fixed 1.215 V output, integrated error flag (power-good/POR), and shutdown control. It operates from 2 V to 6 V input, delivers ≤150 mV dropout at 500 mA, supports ceramic output capacitors down to 1 µF, and features 100 µVRMS noise with CNOISE bypass. It is used in battery-powered portable electronics requiring stable, low-noise, low-quiescent-power regulation.
For engineers reviewing the SI9185DMP-12-T1-E3 datasheet, SI9185DMP-12-T1-E3 pinout, SI9185DMP-12-T1-E3 application, or SI9185DMP-12-T1-E3 equivalent, key selection criteria include guaranteed 500 mA output at 1.215 V, thermal shutdown at 165 °C, 1 µA max shutdown current, fast load transient response (<30 mV deviation), and MLP33 PowerPAK package compatibility with PCB thermal spreading copper.
Technical Context
The SI9185DMP-12-T1-E3 implements a CMOS-based LDO architecture with a 1.215 V internal reference and precision feedback loop, enabling high line/load regulation (±0.18 %/V, ±2.5 % VOUT accuracy) across -40 °C to 85 °C. Its bandwidth exceeds 50 kHz, supporting rapid dynamic response to load steps from 1 mA to 150 mA in <2 µs rise time.
It integrates dual functional pins: DELAY enables programmable POR delay via external capacitor, while CNOISE reduces output noise to 100 µVRMS (50 Hz–100 kHz) when bypassed with 0.1 µF ceramic. The ERROR pin is open-drain with guaranteed low-state voltage ≤0.4 V at 2 mA sink and threshold hysteresis of 2 % × VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.215 V - precisely trimmed for core logic or low-voltage microcontroller I/O rails. |
| Max Output Current | 500 mA continuous - sufficient for SoC subsystems or multi-rail PMIC secondary outputs. |
| Dropout Voltage | ≤480 mV at 500 mA - enables operation down to ~1.7 V input, maximizing battery utilization in single-cell Li-ion or Li-poly systems. |
| Ground Current | 2.5 mA max at 500 mA load - maintains micropower efficiency during active regulation. |
| Output Noise | 100 µVRMS (with 0.1 µF CNOISE) - meets low-noise requirements for ADC references or RF bias rails. |
| Shutdown Current | 1 µA max - preserves battery life during system sleep or standby modes. |
| Ripple Rejection | 60 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Thermal Shutdown | 165 °C junction - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
SI9185DMP-12-T1-E3 uses the thermally enhanced MLP33 PowerPAK package (3.3 mm × 3.3 mm × 0.8 mm), featuring an exposed die pad soldered to PCB ground for low θJA (50 °C/W on 4-layer board with 0.25 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CNOISE | Noise bypass terminal | Connects to 0.01–0.1 µF ceramic capacitor to reduce output noise by 50 %; decouples internal reference. |
| 2 - DELAY | POR timing control | Sources 1.2–3.0 µA to external capacitor; sets ERROR pin assertion delay per tDELAY = VADJ × CDELAY/IDELAY. |
| 3 - GND | Power and signal reference | Common return for VIN, VOUT, CNOISE, DELAY, SENSE/ADJ, and SD; must connect to exposed pad. |
| 4 - VIN | Main power input | Accepts 2–6 V; requires ≥2.2 µF ceramic bypass to GND; supports up to 6.5 V absolute max. |
| 5 - VOUT | Regulated output | Delivers stable 1.215 V; connects to 1–10 µF X5R/X7R ceramic capacitor; capable of 500 mA continuous. |
| 6 - SENSE/ADJ | Feedback node | Internally tied to VOUT for fixed 1.215 V version; not adjustable - no external resistor divider required. |
| 7 - ERROR | Open-drain status flag | Asserts low when VOUT falls >5 % below nominal; doubles as delayed POR signal when DELAY capacitor is present. |
| 8 - SD | Enable/shutdown control | Logic-high (>1.5 V) enables regulation; logic-low (<0.4 V) disables output with <1 µA quiescent draw. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | ≤480 mV at full 500 mA load ensures usable output down to 1.7 V input - critical for single-cell battery longevity. |
| Integrated POR with delay | ERROR pin provides configurable power-on-reset using external DELAY capacitor - eliminates need for discrete reset IC. |
| Ceramic capacitor stability | Stable with 1–10 µF X5R/X7R ceramics - avoids costly tantalum or polymer caps and simplifies BOM. |
| Low-noise regulation | 100 µVRMS output noise with CNOISE bypass - suitable for noise-sensitive analog or RF circuitry. |
| Robust protection | Built-in short-circuit and thermal shutdown (165 °C) with 20 °C hysteresis - prevents damage under fault conditions without external circuitry. |
| Micropower shutdown | 1 µA max shutdown current - extends shelf life and enables long-term storage in battery-powered devices. |
Applications
| Laptop Core Voltage Rail | Digital Still Camera Sensor Bias |
|---|---|
Use Scenario: Powers low-voltage FPGA I/O banks or ARM Cortex-A series core logic in ultraportable laptops. IC Role / Device Role / Timing Role: Primary 1.215 V LDO delivering clean, regulated supply with fast transient response to CPU burst loads. Use Value: Enables >500 mA peak current delivery with <30 mV load transient deviation, preserving signal integrity during DVFS transitions. | Use Scenario: Supplies image sensor analog front-end (AFE) and column ADC reference in compact digital still cameras. IC Role / Device Role / Timing Role: Low-noise, low-dropout regulator providing stable 1.215 V bias for precision analog circuits. Use Value: 100 µVRMS noise floor ensures <1 LSB error in 12-bit ADC conversion, even with minimal PCB filtering. |
| Cellular Phone Baseband Processor | PDA Application Processor Core |
Use Scenario: Regulates core voltage for 2G/3G baseband SoCs operating from single Li-ion cell (3.0–4.2 V). IC Role / Device Role / Timing Role: High-efficiency LDO stepping down battery voltage to 1.215 V with minimal dropout loss. Use Value: 150 mV dropout at 500 mA allows >30 minutes additional talk time versus higher-dropout alternatives. | Use Scenario: Supplies application processor core rail in handheld PDAs with aggressive power management. IC Role / Device Role / Timing Role: Micropower LDO with shutdown control and POR signaling for coordinated system boot sequencing. Use Value: 1 µA shutdown current and programmable ERROR delay enable deterministic wake-up from deep-sleep states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B122MR-G | 1.2 V fixed output, 500 mA, 250 mV dropout at 500 mA, SOT-25 package, no ERROR/DELAY pins | Lacks power-good flag and POR delay; suited for simpler point-of-load use without system-level reset coordination | Select when footprint and cost are prioritized over integrated monitoring features |
| Richtek RT9193-12GB | 1.2 V fixed output, 300 mA, 200 mV dropout at 300 mA, SOT-23-5, includes EN and NRESET pins | Lower current rating and no CNOISE pin; NRESET is push-pull, not open-drain like ERROR | Choose for space-constrained designs needing basic enable/reset but not ultra-low noise or 500 mA capability |
Compared with XC6219B122MR-G and RT9193-12GB, SI9185DMP-12-T1-E3 uniquely combines 500 mA output, 1.215 V precision, integrated open-drain ERROR with DELAY-programmable POR, and CNOISE-enabled 100 µVRMS noise - making it optimal for high-reliability portable systems demanding both performance and system-level control.
Availability
SI9185DMP-12-T1-E3 is available at Aetrix Electronics and suitable for laptop core rails, digital camera sensor bias, cellular baseband processors, and PDA application processor cores requiring stable component supply, RoHS-compliant packaging, and industrial temperature range (-40 °C to 85 °C) operation.
Supply support for SI9185DMP-12-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 semiconductor manufacturer specializing in discrete MOSFETs, diodes, optoelectronics, and precision analog ICs, with emphasis on power efficiency, thermal performance, and reliability.
The Si9185 family was designed specifically for battery-powered portable electronics, targeting extended runtime through micropower operation, ultra-low dropout, and fast transient response - all in thermally enhanced MLP packages.
FAQ
What is the output voltage tolerance of the SI9185DMP-12-T1-E3 over temperature and load?
The SI9185DMP-12-T1-E3 guarantees ±2.5 % output voltage accuracy across -40 °C to 85 °C ambient and 1 mA to 500 mA load. At room temperature, tolerance tightens to ±1.5 %. This 1.215 V output is factory-trimmed and does not require external resistors, as the SENSE/ADJ pin is internally connected to VOUT in this fixed-voltage variant.
Does the SI9185DMP-12-T1-E3 require an external capacitor on the CNOISE pin?
The SI9185DMP-12-T1-E3 does not require the CNOISE capacitor for basic regulation, but adding a 0.1 µF X5R/X7R ceramic capacitor from CNOISE to GND reduces output noise from 200 µVRMS to 100 µVRMS (50 Hz–100 kHz). This is essential for noise-sensitive applications like ADC references or RF bias supplies where SI9185DMP-12-T1-E3 is deployed.
How is the power-on-reset (POR) delay configured on the SI9185DMP-12-T1-E3?
The POR delay on SI9185DMP-12-T1-E3 is set by connecting a capacitor from the DELAY pin to GND. The device sources 1.2–3.0 µA from DELAY, so delay time follows tDELAY = VADJ × CDELAY/IDELAY ≈ 1.215 V × CDELAY/2.2 µA. For example, a 0.1 µF capacitor yields ~55 ms delay. The ERROR pin then transitions high after this interval once VOUT reaches regulation - a feature unique to SI9185DMP-12-T1-E3 among 1.2 V LDOs.
What is the maximum allowable input voltage for the SI9185DMP-12-T1-E3?
The SI9185DMP-12-T1-E3 has an absolute maximum input voltage (VIN) rating of 6.5 V, but its recommended operating range is 2 V to 6 V. Operation above 6 V risks permanent damage. For reliable 1.215 V output, minimum VIN must exceed VOUT + dropout - e.g., ≥1.7 V at light load or ≥1.7 V + 0.48 V = ~2.18 V at 500 mA - ensuring SI9185DMP-12-T1-E3 remains in regulation.
Can the SI9185DMP-12-T1-E3 be used with tantalum output capacitors?
Yes, the SI9185DMP-12-T1-E3 is stable with both ceramic (X5R/X7R, 1–10 µF) and tantalum output capacitors. However, ceramic capacitors are preferred due to lower ESR, better transient response, and absence of leakage current - especially critical for maintaining SI9185DMP-12-T1-E3's 1 µA shutdown current spec. Tantalum use requires verifying ESR < 100 mΩ and derating voltage by 50 %.
SI9185DMP-12-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):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.825V @ 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-12-T1-E3 FAQ
1.How can I place an order for SI9185DMP-12-T1-E3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI9185DMP-12-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-12-T1-E3 reliable?
The price and inventory of SI9185DMP-12-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-12-T1-E3 is usually 5 days.
3.What payment methods are accepted for SI9185DMP-12-T1-E3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI9185DMP-12-T1-E3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI9185DMP-12-T1-E3?
SI9185DMP-12-T1-E3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI9185DMP-12-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-12-T1-E3?
For technical support, including SI9185DMP-12-T1-E3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI9185DMP-12-T1-E3 requirements.
6.How does Aetrix verify that SI9185DMP-12-T1-E3 is sourced from the original manufacturer or authorized distributors?
All SI9185DMP-12-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-12-T1-E3 meets industry standards.
7.What is the process for return or replacement of SI9185DMP-12-T1-E3?
All SI9185DMP-12-T1-E3 units undergo pre-shipment inspection (PSI). If there is an issue with SI9185DMP-12-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-12-T1-E3 part is unused and in its original packaging.
Return procedure for SI9185DMP-12-T1-E3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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