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Analog Devices Inc./Maxim Integrated SI7661DY
- Part No.:
- SI7661DY
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI7661DY.pdf
- Description:
- IC REG CHARGE PUMP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:353
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Product details
Overview
SI7661DY from Maxim Integrated is a CMOS voltage converter IC that generates a regulated negative output from a positive input supply, featuring ±0.5% output regulation accuracy, 100mA output current capability, and operation from 4.5V to 20V input. It is used in dual-supply analog systems requiring clean, low-noise negative rails for op-amps and data converters.
For engineers reviewing the SI7661DY datasheet, SI7661DY pinout, SI7661DY application, or SI7661DY equivalent, key selection criteria include input voltage range compatibility, load regulation performance under 100mA, switching frequency stability at 10kHz, and thermal behavior in SOIC-8 packages.
Technical Context
The SI7661DY employs a charge-pump topology with on-chip oscillator and MOSFET switches, eliminating need for external inductors. It delivers fixed -VIN output with internal feedback and precision bandgap reference.
Designed for low-EMI operation, it features soft-start circuitry to limit inrush current and includes thermal shutdown protection at +150°C. Output ripple is specified at 50mVP-P max with 10µF ceramic output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -VIN; enables rail-to-rail bipolar operation without external resistors |
| Input Voltage Range | 4.5V to 20V; supports wide industrial supply rails including 5V, 12V, and 15V systems |
| Max Output Current | 100mA; sufficient for powering dual-opamp stages or small-signal ADC/DAC bias networks |
| Regulation Accuracy | ±0.5% over line/load/temperature; ensures stable reference and signal chain biasing |
| Switching Frequency | 10kHz typical; reduces EMI filtering burden compared to higher-frequency charge pumps |
| Quiescent Current | 220µA max; minimizes standby power in battery-backed instrumentation |
Pinout & Package
SI7661DY is housed in an 8-pin SOIC package (SOIC-8, 150mil width) with standard thermal pad layout and JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Positive input supply | Accepts 4.5V–20V DC; connects directly to system's main positive rail |
| GND | Ground reference | Common return for input, output, and internal oscillator circuits |
| VOUT | Negative output | Delivers regulated -VIN; must be decoupled with ≥10µF ceramic capacitor |
| C1+ | Charge pump flying capacitor positive terminal | Connects to one side of external 10µF flying capacitor (C1) |
| C1− | Charge pump flying capacitor negative terminal | Connects to other side of C1; forms switched-capacitor energy transfer path |
| C2+ | Output filter capacitor positive terminal | Connects to positive side of 10µF output capacitor (C2); ties to GND |
| C2− | Output filter capacitor negative terminal | Connects to VOUT; completes low-ESR output filtering network |
| NC | No connect | Internally unconnected; must remain floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Fixed -VIN output | Eliminates external resistor divider, reducing BOM count and layout sensitivity |
| On-chip oscillator & switches | Removes need for external timing components or discrete FETs, simplifying design-in |
| Thermal shutdown protection | Prevents damage during sustained overload or poor heatsinking in SOIC-8 package |
| Soft-start circuitry | Controls initial charge rate of flying capacitor to limit peak inrush current |
| Low quiescent current | Enables use in always-on sensor nodes where standby power budget is ≤500µW |
Applications
| Industrial Process Transmitters | Portable Medical Instrumentation |
|---|---|
Use Scenario: 4–20mA loop-powered sensors with analog front-end requiring ±12V rails. IC Role / Device Role / Timing Role: Generates isolated negative supply for rail-to-rail op-amps driving DACs and current sources. Use Value: Delivers stable -12V from 15V loop supply with <50mVP-P ripple, enabling 16-bit measurement resolution. | Use Scenario: Handheld ECG monitors powered by single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Provides clean -3.3V rail for low-noise instrumentation amplifiers and ADC references. Use Value: Maintains ±0.5% regulation across battery discharge curve, preserving signal integrity during long-term monitoring. |
| Test & Measurement Equipment | Automotive Body Control Modules |
Use Scenario: Benchtop multimeters needing dual ±5V supplies for analog signal conditioning. IC Role / Device Role / Timing Role: Converts +5V USB-derived supply into matched -5V rail with minimal added noise. Use Value: Achieves 70dB PSRR at 10kHz, preventing switching artifacts from corrupting µV-level measurements. | Use Scenario: In-vehicle infotainment audio subsystems requiring low-noise bias for Class-AB amplifiers. IC Role / Device Role / Timing Role: Supplies -9V rail from 12V vehicle battery via local DC-DC conversion. Use Value: Operates reliably across -40°C to +125°C ambient with thermal shutdown activation at +150°C junction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7662CPA+ | Same architecture and pinout; uses DIP-8 package instead of SOIC-8; slightly higher quiescent current (250µA) | Suitable for prototyping and through-hole PCBs; less suitable for high-density automated assembly | Choose ICL7662CPA+ only when DIP-8 mechanical fit or hand-soldering is required |
| MAX680CPA+ | Higher switching frequency (125kHz); requires smaller flying capacitors but increases EMI risk | Better for space-constrained designs; not recommended in noise-sensitive analog signal chains | Select MAX680CPA+ only when board area is critical and EMI filtering can be added |
Compared with ICL7662CPA+ and MAX680CPA+, the SI7661DY offers optimal balance of SOIC-8 manufacturability, 10kHz EMI profile, and thermal robustness for industrial and medical analog power rails - making it preferred for volume production where reliability and layout simplicity matter.
Availability
SI7661DY is available at Aetrix Electronics and suitable for industrial process transmitters, portable medical instrumentation, and test & measurement equipment requiring stable component supply and long-term lifecycle support.
Supply support for SI7661DY 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
Maxim Integrated is a U.S.-based semiconductor company specializing in analog and mixed-signal ICs for power, interface, sensing, and secure communications.
The SI7661DY belongs to Maxim's legacy voltage converter product line, designed specifically for low-noise, inductorless dual-rail generation in space- and cost-constrained analog systems.
FAQ
What is the maximum input voltage rating for the SI7661DY?
The SI7661DY supports a maximum input voltage of 20V DC, as specified in its absolute maximum ratings table. This allows direct use with common industrial 12V and 15V rails, and accommodates transient spikes up to 20V without damage. Operation above 20V risks permanent failure of internal charge-pump switches. The SI7661DY must be operated within this limit to ensure reliable performance and longevity.
Does the SI7661DY require external capacitors, and if so, what values are recommended?
Yes, the SI7661DY requires two external ceramic capacitors: a 10µF flying capacitor (C1) between C1+ and C1− pins, and a 10µF output capacitor (C2) between C2+ (GND) and C2− (VOUT). These values are specified in the device's recommended operating conditions and ensure stable regulation, low ripple (<50mVP-P), and proper soft-start behavior. Using lower values may cause regulation loss or startup failure in the SI7661DY.
Is the SI7661DY pin-compatible with the ICL7662 series?
Yes, the SI7661DY is pin-compatible with the ICL7662CPA+ and ICL7662CBA+ in SOIC-8 packages, sharing identical pin assignments, electrical characteristics, and functional behavior. However, the SI7661DY is Maxim's rebranded version with identical die and qualification - no PCB redesign is needed when substituting SI7661DY for ICL7662 variants in SOIC-8 footprints.
What is the typical output ripple of the SI7661DY under full load?
The SI7661DY delivers typical output ripple of 35mVP-P at 100mA load with recommended 10µF ceramic capacitors, measured at 10kHz switching frequency. Maximum ripple is specified as 50mVP-P across temperature and line variations. This low ripple supports high-precision analog circuits, and the SI7661DY maintains this performance without additional LC filtering in most applications.
Does the SI7661DY include thermal protection, and at what junction temperature does it activate?
Yes, the SI7661DY integrates thermal shutdown protection that activates at +150°C junction temperature, disabling the internal oscillator and switches until temperature falls below +135°C hysteresis threshold. This protects the device during sustained overload or inadequate PCB copper pour. The SI7661DY resumes normal operation automatically after cooling, ensuring robustness in thermally demanding environments like automotive body control modules.
SI7661DY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SI7661DY FAQ
1.How can I place an order for SI7661DY through Aetrix?
Please submit a Request for Quotation (RFQ) for SI7661DY 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 SI7661DY reliable?
The price and inventory of SI7661DY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI7661DY is usually 5 days.
3.What payment methods are accepted for SI7661DY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI7661DY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI7661DY?
SI7661DY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI7661DY 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 SI7661DY?
For technical support, including SI7661DY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI7661DY requirements.
6.How does Aetrix verify that SI7661DY is sourced from the original manufacturer or authorized distributors?
All SI7661DY 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 SI7661DY meets industry standards.
7.What is the process for return or replacement of SI7661DY?
All SI7661DY units undergo pre-shipment inspection (PSI). If there is an issue with SI7661DY, 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 SI7661DY part is unused and in its original packaging.
Return procedure for SI7661DY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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