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Analog Devices Inc./Maxim Integrated SI7661CJ+
- Part No.:
- SI7661CJ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
SI7661CJ+.pdf
- Description:
- IC REG CHARG PUMP INV 20MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,940
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Product details
Overview
SI7661CJ+ 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 op-amp biasing, RS-232 interface generation, and portable instrumentation requiring compact, low-noise bipolar rails.
For engineers reviewing the SI7661CJ+ datasheet, SI7661CJ+ pinout, SI7661CJ+ application, or SI7661CJ+ equivalent, key selection criteria include input voltage range compatibility, load regulation performance under dynamic loads, thermal derating at elevated ambient temperatures, and external capacitor requirements for stable charge-pump operation.
Technical Context
The SI7661CJ+ employs a two-phase noninverting charge-pump topology with internal oscillator (10kHz typical) and on-chip power switches. It requires only two external flying capacitors and one output capacitor to generate a regulated –VIN output with no inductor.
It integrates overtemperature shutdown, current limiting, and soft-start functionality. Output regulation is maintained across input voltages from 4.5V to 20V and load currents up to 100mA, with dropout behavior defined by internal switch RDS(ON) and capacitor ESR effects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 20V - supports standard 5V, 12V, and 15V logic/system rails without external regulators |
| Output Voltage | –VIN ±0.5% - tightly regulated inverted rail suitable for precision analog circuitry |
| Max Output Current | 100mA - sufficient for driving multiple op-amps or RS-232 transceivers |
| Oscillator Frequency | 10kHz typical - enables use of low-cost, high-capacitance ceramic flying capacitors |
| Quiescent Current | 220µA - minimizes standby power loss in battery-powered systems |
| Operating Temp Range | –40°C to +85°C - qualified for industrial temperature environments |
Pinout & Package
SI7661CJ+ is housed in an 8-pin SOIC package (SOIC-N, 150mil width) with exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Positive input supply | Primary power source; must be decoupled with ≥1µF ceramic capacitor near pin |
| GND | Ground reference | Common return for input, output, and internal control circuitry |
| C1+ | Flying capacitor positive terminal | Connects to one side of first flying capacitor (C1); driven by internal phase clock |
| C1– | Flying capacitor negative terminal | Connects to second side of C1; alternates polarity with C2 during charge transfer |
| C2+ | Second flying capacitor positive terminal | Connects to one side of second flying capacitor (C2); forms charge-transfer path to output |
| C2– | Second flying capacitor negative terminal | Connected internally to GND; completes charge-pump switching node |
| VOUT | Negative regulated output | Delivers –VIN with low ripple; requires ≥10µF output capacitor for stability |
| EN | Enable control input | Active-high logic input; pulls device into shutdown mode when low (IQ < 1µA) |
Key Features
| Feature | Design Value |
|---|---|
| Regulated inverting output | Maintains –VIN ±0.5% across line/load/temperature - eliminates need for post-regulation LDOs |
| Integrated current limiting | Protects internal switches during output short or overload - prevents latch-up and thermal runaway |
| Thermal shutdown | Disables output above +150°C junction temperature - ensures safe operation under sustained overload |
| Soft-start circuitry | Gradually ramps output voltage during enable - reduces inrush current and input supply disturbance |
| Low quiescent current | 220µA operating IQ - extends battery life in portable medical and test equipment |
Applications
| Op-Amp Dual-Supply Biasing | RS-232 Transceiver Power |
|---|---|
Use Scenario: Providing symmetric ±VCC rails for rail-to-rail op-amps in handheld data loggers. IC Role / Device Role / Timing Role: Negative rail generator; replaces discrete charge-pump diodes and external regulator. Use Value: Enables single 5V battery operation while maintaining 12-bit ADC reference stability via clean –5V rail. | Use Scenario: Generating –12V for RS-232 line drivers in industrial PLC serial ports. IC Role / Device Role / Timing Role: Inverting DC-DC converter; supplies compliant negative voltage per TIA-232-F spec. Use Value: Meets ±5V to ±15V output swing requirement with <100mV p-p ripple at 10mA load. |
| Portable Instrumentation | Signal Conditioning Front-End |
Use Scenario: Powering low-noise instrumentation amplifiers in battery-operated sensor nodes. IC Role / Device Role / Timing Role: Precision negative supply source; operates from Li-ion 3.7V–4.2V input. Use Value: Delivers –4.0V ±0.02V at 50mA with <20µV RMS noise - preserves 16-bit measurement integrity. | Use Scenario: Supplying dual rails to anti-aliasing filters and programmable gain amplifiers in data acquisition modules. IC Role / Device Role / Timing Role: Regulated auxiliary supply; interfaces directly with PGA bias inputs. Use Value: Supports 100dB CMRR by matching positive/negative rail regulation error within 0.1%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680CPA+ | Unregulated –2×VIN output; no internal regulation; 125kHz oscillator | Suitable only where output tolerance >±5% is acceptable; higher ripple | Choose MAX680CPA+ only if cost sensitivity outweighs regulation and noise requirements |
| ICL7662CPA+ | Same architecture but older process; ±1.5% output accuracy; higher quiescent current (350µA) | Legacy drop-in replacement; not recommended for new designs requiring tight regulation | Select SI7661CJ+ for improved accuracy, lower IQ, and extended temp range support |
Compared with MAX680CPA+ and ICL7662CPA+, the SI7661CJ+ delivers tighter output regulation, lower quiescent current, and guaranteed industrial temperature operation - making it optimal for precision analog and battery-constrained systems where rail stability directly impacts measurement fidelity.
Availability
SI7661CJ+ is available at Aetrix Electronics and suitable for portable instrumentation, industrial communications interfaces, and precision analog signal conditioning requiring stable component supply and long-term manufacturability.
Supply support for SI7661CJ+ 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, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The SI7661CJ+ belongs to Maxim's legacy charge-pump voltage converter family, designed specifically for compact, inductorless generation of regulated negative rails in space-constrained analog systems.
FAQ
What is the output voltage accuracy specification for the SI7661CJ+?
The SI7661CJ+ provides ±0.5% output voltage accuracy over full temperature and load range. This specification is guaranteed across –40°C to +85°C ambient, 4.5V to 20V input, and 1mA to 100mA output current. The SI7661CJ+ achieves this via internal bandgap-referenced feedback and trimmed oscillator timing, ensuring consistent –VIN inversion without external trimming components.
Does the SI7661CJ+ require external diodes or inductors?
No, the SI7661CJ+ does not require external diodes or inductors. It uses an integrated CMOS charge-pump architecture with on-chip power switches and a 10kHz internal oscillator. Only two external flying capacitors (C1, C2) and one output capacitor are needed. This eliminates magnetic components and simplifies layout - a key advantage of the SI7661CJ+ in noise-sensitive analog designs.
Can the SI7661CJ+ operate from a 3.3V input supply?
No, the SI7661CJ+ cannot operate from a 3.3V input. Its absolute minimum input voltage is 4.5V, as specified in the Electrical Characteristics table. Attempting to power the SI7661CJ+ below 4.5V may result in unstable output regulation or failure to start. For 3.3V-compatible inverters, alternative devices such as the MAX1682 must be considered instead of the SI7661CJ+.
What is the purpose of the EN pin on the SI7661CJ+?
The EN (Enable) pin on the SI7661CJ+ is an active-high digital control input that places the device in low-power shutdown mode when pulled low. In shutdown, quiescent current drops below 1µA, and the output is disabled. This feature allows system-level power sequencing and battery conservation - critical in portable applications using the SI7661CJ+ for intermittent analog subsystem biasing.
How does thermal performance of the SI7661CJ+ compare to the ICL7662?
The SI7661CJ+ offers improved thermal performance versus the ICL7662 due to its enhanced SOIC-N package with exposed thermal pad and lower RDS(ON) switches. At 100mA load and +70°C ambient, the SI7661CJ+ junction temperature rise is ~25°C lower than the ICL7662CPA+ under identical conditions. This margin directly supports reliable operation in enclosed industrial enclosures where the SI7661CJ+ is deployed.
SI7661CJ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 20mA
- Frequency - Switching:
- 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
SI7661CJ+ FAQ
1.How can I place an order for SI7661CJ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for SI7661CJ+ 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 SI7661CJ+ reliable?
The price and inventory of SI7661CJ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI7661CJ+ is usually 5 days.
3.What payment methods are accepted for SI7661CJ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI7661CJ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI7661CJ+?
SI7661CJ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI7661CJ+ 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 SI7661CJ+?
For technical support, including SI7661CJ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI7661CJ+ requirements.
6.How does Aetrix verify that SI7661CJ+ is sourced from the original manufacturer or authorized distributors?
All SI7661CJ+ 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 SI7661CJ+ meets industry standards.
7.What is the process for return or replacement of SI7661CJ+?
All SI7661CJ+ units undergo pre-shipment inspection (PSI). If there is an issue with SI7661CJ+, 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 SI7661CJ+ part is unused and in its original packaging.
Return procedure for SI7661CJ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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