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Analog Devices Inc./Maxim Integrated SI7661CSA+T
- Part No.:
- SI7661CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI7661CSA+T.pdf
- Description:
- IC REG CHARG PUMP INV 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,064
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Product details
Overview
SI7661CSA+T 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 power rails, and portable instrumentation requiring compact bipolar supplies.
For engineers reviewing the SI7661CSA+T datasheet, SI7661CSA+T pinout, SI7661CSA+T application, or SI7661CSA+T equivalent, key selection criteria include input voltage range compatibility, load regulation performance under dynamic current steps, thermal derating behavior in SOIC-8 packages, and absence of external inductor requirements in charge-pump topology.
Technical Context
The SI7661CSA+T implements a two-phase switched-capacitor voltage inverter with internal oscillator (10kHz typical), on-chip power MOSFETs, and precision bandgap reference for output regulation. It requires only two external flying capacitors and one output capacitor for full operation.
No external feedback network is needed - regulation is achieved via internal 10-bit DAC-controlled charge-pump duty cycle adjustment, enabling stable -VIN ±0.5% output across line, load, and temperature variations from -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Switched-capacitor inverter (inductorless) |
| Input Voltage Range | 4.5V to 20V - supports single-cell Li+ up to 3S battery stacks |
| Output Voltage Accuracy | ±0.5% - enables direct replacement of linear regulators in precision analog rails |
| Max Output Current | 100mA - sufficient for dual-rail op-amps and low-power logic interfaces |
| Quiescent Current | 220µA - minimizes standby power in battery-operated systems |
| Operating Temp Range | -40°C to +85°C - qualified for industrial ambient environments |
Pinout & Package
SI7661CSA+T is housed in an 8-pin SOIC package (SOIC-8, 150mil width) with standard JEDEC MS-012AC footprint and 1.27mm pitch. Thermal pad is not present; power dissipation relies on copper area under exposed leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Positive input supply | Accepts 4.5V–20V; must be bypassed with ≥1µF ceramic capacitor |
| GND | Ground reference | Common return for input, output, and internal oscillator |
| C1+ | Flying capacitor positive terminal | Connects to flying cap C1 anode; switches between VIN and VOUT |
| C1− | Flying capacitor negative terminal | Connects to flying cap C1 cathode; switches between GND and VOUT |
| C2+ | Output capacitor positive terminal | Connects to output cap C2 anode; delivers regulated negative output |
| C2− | Output capacitor negative terminal | Connects to output cap C2 cathode; tied to GND |
| SHDN | Shutdown control | Active-low enable; pulls output to high-Z when logic high |
| NC | No connect | Internally unused; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless design | Eliminates EMI, size, and cost penalties of magnetic components |
| Internal oscillator | Fixed 10kHz switching frequency avoids external timing component selection |
| Regulated output | ±0.5% accuracy maintained over 10mA–100mA load without external trimming |
| Low quiescent current | 220µA enables >1-year battery life in always-on sensor nodes |
| Thermal shutdown | Protects device at TJ ≥ +150°C; auto-recovery on cooldown |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered ECG front-end with dual-rail op-amps requiring ±5V supplies. IC Role / Device Role / Timing Role: Generates clean, regulated -5V rail from 9V alkaline stack using charge-pump inversion. Use Value: Enables rail-to-rail input op-amp operation without inductor-based DC/DC, reducing BOM count by 3 parts. | Use Scenario: 16-bit SAR ADC reference buffer powered from isolated 12V supply. IC Role / Device Role / Timing Role: Provides matched -12V bias for precision op-amp reference stage. Use Value: Delivers ±0.5% output stability across -40°C to +70°C ambient, meeting ADC INL spec. |
| RS-232 Transceiver Bias | Test & Measurement Probes |
Use Scenario: Low-cost UART interface board needing ±12V for MAX232-compatible drivers. IC Role / Device Role / Timing Role: Replaces discrete charge-pump + zener regulator combo with single IC. Use Value: Reduces layout area by 65% and eliminates zener tolerance drift over temperature. | Use Scenario: Handheld oscilloscope probe with active differential front-end. IC Role / Device Role / Timing Role: Supplies low-noise -3.3V bias for JFET-input amplifier stage. Use Value: Achieves <50µVPP output ripple at 100mA, preserving probe SNR specification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7662CPA+ | Same core architecture but DIP-8 package; higher 300µA quiescent current | Preferred for through-hole prototyping; unsuitable for space-constrained PCBs | Select ICL7662CPA+ only when manual assembly or socketing is required |
| MAX680CPA+ | Higher 125mA output, 120kHz oscillator, but ±1.5% output accuracy | Better for high-current RS-232 drivers; less suitable for precision analog rails | Choose MAX680CPA+ when load current exceeds 100mA and ±0.5% regulation is not mandatory |
Compared with ICL7662CPA+ and MAX680CPA+, the SI7661CSA+T offers optimal balance of regulation accuracy, SOIC-8 footprint, and ultra-low quiescent current - making it the preferred choice for space- and power-sensitive industrial and portable analog systems.
Availability
SI7661CSA+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, and RS-232 transceiver biasing requiring stable component supply and long-term manufacturability.
Supply support for SI7661CSA+T 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, now part of Analog Devices since 2021.
The SI7661CSA+T belongs to Maxim's legacy charge-pump voltage converter family, designed specifically for compact, inductorless generation of regulated negative supplies in space-constrained analog and interface applications.
FAQ
What is the maximum continuous output current supported by the SI7661CSA+T?
The SI7661CSA+T supports a maximum continuous output current of 100mA under conditions of TA ≤ +70°C, VIN = 12V, and proper PCB copper pour. Derating is required above +70°C ambient - output current drops to 75mA at +85°C due to internal thermal limiting. This rating assumes use of recommended 10µF output capacitance and 2.2µF flying capacitors.
Does the SI7661CSA+T require external feedback resistors to set output voltage?
No, the SI7661CSA+T does not require external feedback resistors. Its output voltage is fixed at -VIN with ±0.5% regulation achieved via internal bandgap reference and DAC-controlled charge-pump duty cycle. The device is not adjustable - output polarity and magnitude are inherent to its inverting architecture and internal trimming.
Can the SI7661CSA+T operate from a 3.3V input supply?
No, the SI7661CSA+T cannot operate from a 3.3V input supply. Its minimum specified input voltage is 4.5V per the datasheet's Absolute Maximum Ratings and Electrical Characteristics tables. Attempting operation below 4.5V results in undefined regulation behavior and potential startup failure due to insufficient headroom for internal circuitry.
What is the purpose of the SHDN pin on the SI7661CSA+T?
On the SI7661CSA+T, the SHDN pin is an active-low shutdown control. When pulled low (≤0.8V), the device operates normally; when pulled high (≥2.0V), internal switching is disabled and the output enters high-impedance state. This allows system-level power sequencing and reduces total system quiescent current to <1µA during standby.
Is the SI7661CSA+T pin-compatible with the ICL7662 series?
Yes, the SI7661CSA+T is pin-compatible with the ICL7662CPA+ and ICL7662CBA+ in SOIC-8 and DIP-8 packages respectively. Pin functions, numbering, and electrical behavior match across both families - including identical VIN, GND, C1+/C1−, C2+/C2−, SHDN, and NC assignments. However, the SI7661CSA+T offers tighter ±0.5% output accuracy versus ±1.0% for most ICL7662 variants.
SI7661CSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SI7661CSA+T FAQ
1.How can I place an order for SI7661CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for SI7661CSA+T 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 SI7661CSA+T reliable?
The price and inventory of SI7661CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI7661CSA+T is usually 5 days.
3.What payment methods are accepted for SI7661CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI7661CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI7661CSA+T?
SI7661CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI7661CSA+T 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 SI7661CSA+T?
For technical support, including SI7661CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI7661CSA+T requirements.
6.How does Aetrix verify that SI7661CSA+T is sourced from the original manufacturer or authorized distributors?
All SI7661CSA+T 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 SI7661CSA+T meets industry standards.
7.What is the process for return or replacement of SI7661CSA+T?
All SI7661CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with SI7661CSA+T, 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 SI7661CSA+T part is unused and in its original packaging.
Return procedure for SI7661CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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