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onsemi CAT661EVA-T3
- Part No.:
- CAT661EVA-T3
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CAT661EVA-T3.pdf
- Description:
- IC REG MULTI CONFIG 0.1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,897
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Product details
Overview
CAT661EVA-T3 from onsemi is a high-frequency CMOS charge-pump voltage converter capable of inverting +2.5 V to +5.5 V inputs to negative outputs or doubling inputs to +5 V to +11 V outputs, with guaranteed 100 mA output current, 10 Ω max output resistance, and selectable 25 kHz or 135 kHz oscillator frequency - used in GaAs FET biasing, LCD contrast generation, and lithium battery-powered instrumentation.
For engineers reviewing the CAT661EVA-T3 datasheet, pinout, applications, or equivalent options, this page delivers verified functional identity, SOIC-8 package mapping, confirmed inverter/doubler dual-mode operation, real-world ESR-sensitive efficiency behavior, and validated alternatives for low-EMI DC-DC conversion without inductors.
Technical Context
The CAT661EVA-T3 implements a switched-capacitor topology with internal MOSFET switches controlled by a programmable oscillator. Its BOOST/FC pin selects between two fixed internal frequencies (25 kHz or 135 kHz), while the OSC pin supports external capacitor tuning or clock injection - with pump frequency always half the OSC input frequency.
It operates in two mutually exclusive modes: inverter mode (V+ → −VOUT, LV = GND or open) and doubler mode (V+ → +2VOUT, LV = OUT), each requiring distinct pin configurations and external capacitor networks. Output impedance is dominated by internal switch RDS(on), C1 ESR (weighted ×4), and C2 ESR - all directly impacting load regulation and ripple under 100 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V (doubler mode); 1.5 V to 5.5 V (inverter mode with LV = GND) |
| Output Current | 100 mA (guaranteed minimum at −4 V or +5 V output, defining usable load headroom) |
| Oscillator Frequency | 25 kHz (BOOST/FC open) or 135 kHz (BOOST/FC = V+) - sets trade-off between quiescent current and capacitor size |
| Output Resistance | ≤10 Ω (measured with 10 μF–100 μF capacitors; determines voltage drop under load) |
| Power Efficiency | 92–96% (inverter, 500 Ω load); 96–98% (doubler, 1 kΩ load) - defines thermal and battery-life impact |
| Operating Temperature | −40°C to +85°C - validated across industrial ambient range without derating |
| ESD Rating (HBM) | 2000 V - constrains handling and board-level protection requirements |
Pinout & Package
Package: 8-pin SOIC (Case 751BD, 150-mil width), RoHS-compliant, Pb-free, halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST/FC | Oscillator frequency control | Open = 25 kHz; tied to V+ = 135 kHz - directly sets capacitor sizing and quiescent current |
| 2: CAP+ | Positive terminal of charge pump capacitor C1 | Node where C1 connects during charge phase; high dv/dt node requiring low-ESR capacitor |
| 3: GND | Power ground reference | Return path for inverter mode; serves as positive input rail in doubler mode |
| 4: CAP− | Negative terminal of charge pump capacitor C1 | Node where C1 connects during discharge phase; critical for inversion polarity and ripple |
| 5: OUT | Voltage converter output | Delivers −V+ (inverter) or +2V+ (doubler); load connected here determines regulation performance |
| 6: LV | Low-voltage mode selection | GND = inverter mode (V+ < 3 V); OUT = doubler mode - configures internal switch matrix |
| 7: OSC | Oscillator control input | Accepts external capacitor (frequency reduction) or logic-level clock (frequency override) |
| 8: V+ | Positive power supply input | Primary input rail; supplies both IC core and pumped output energy - must be stable and low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Inverter/Doubler Dual Mode | Single device replaces separate inverter and doubler ICs via LV pin configuration - reduces BOM count and layout area |
| 100 mA Guaranteed Output | Enables direct replacement of inductor-based switching regulators in space-constrained, low-EMI applications |
| Selectable Oscillator Frequency | 25 kHz (low IQ, larger caps) vs. 135 kHz (smaller caps, higher IQ) - allows optimization for battery life or size |
| Low 10 Ω Max Output Resistance | Ensures ≤1 V drop at 100 mA load - critical for stable biasing in RF and analog circuits |
| Pb-Free SOIC-8 Packaging | Complies with RoHS, halogen-free, and BFR-free standards - meets global environmental compliance mandates |
Applications
| Instrumentation Power Supply | LCD Contrast Bias Generation |
|---|---|
Use Scenario: Portable multimeter or sensor node requiring isolated ±5 V rails from a single 5 V Li-ion cell. IC Role / Device Role / Timing Role: CAT661EVA-T3 acts as negative voltage generator and precision voltage splitter - producing symmetrical rails without magnetic components. Use Value: Eliminates inductor-related EMI and size penalty while maintaining 92–96% efficiency at 50–100 mA loads. | Use Scenario: Monochrome LCD display in handheld medical device needing adjustable contrast voltage from 3.3 V system rail. IC Role / Device Role / Timing Role: CAT661EVA-T3 operates in doubler mode to generate +6.6 V, then uses internal divider topology to produce precise −3.3 V bias. Use Value: Achieves <±0.002% mid-rail accuracy at <100 nA load - enabling fine-grained contrast control without trimming. |
| GaAs FET Gate Biasing | Cellular Phone RF Front-End |
Use Scenario: Bias network for GaAs pHEMT amplifier requiring stable −5 V gate voltage from 3.6 V battery. IC Role / Device Role / Timing Role: CAT661EVA-T3 functions as low-noise negative voltage generator - configured with 135 kHz oscillator and low-ESR tantalum caps. Use Value: Delivers 100 mA at −5 V with <45 mV peak-to-peak ripple - meeting stringent RF noise floor requirements. | Use Scenario: Power management in GSM/EDGE handset requiring dual-rail bias for PA driver stages during burst transmission. IC Role / Device Role / Timing Role: CAT661EVA-T3 provides fast transient response negative rail (−3.5 V) synchronized to TX enable signal via OSC pin control. Use Value: Enables 135 kHz operation for rapid start-up and minimal capacitor footprint - critical for compact antenna module integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge-pump voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX660CPA+ | Fixed 10 kHz oscillator; 40 mA max output; no BOOST/FC pin; requires larger capacitors | Lower frequency limits ripple filtering but increases capacitor size and reduces efficiency at >50 mA loads | Prefer MAX660CPA+ only when ultra-low IQ (<100 μA) and legacy compatibility outweigh output current needs |
| LTC1044CS8#PBF | Fixed 25 kHz oscillator; 20 mA max output; no frequency select; higher 35 Ω output resistance | Insufficient for 100 mA loads - exhibits >2 V drop at full rated current | Choose LTC1044CS8#PBF only for low-current (<20 mA), cost-sensitive designs where footprint matches SOIC-8 |
Compared with MAX660CPA+ and LTC1044CS8#PBF, CAT661EVA-T3 delivers 2.5× higher output current, selectable frequency for capacitor optimization, and 3.5× lower output resistance - making it the only option among the three suitable for 100 mA GaAs FET biasing or LCD contrast generation with tight regulation.
Availability
CAT661EVA-T3 is available at Aetrix Electronics and suitable for portable instrumentation, LCD display modules, RF front-end biasing, and battery-powered medical devices requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for CAT661EVA-T3 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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The CAT661EVA-T3 belongs to onsemi's high-efficiency charge-pump converter product line, designed specifically for low-EMI, inductorless DC-DC conversion in space-constrained portable and RF systems.
FAQ
What is the primary function of the CAT661EVA-T3?
The CAT661EVA-T3 is a dual-mode CMOS charge-pump voltage converter that either inverts a positive input (e.g., +5 V → −5 V) or doubles it (e.g., +3.3 V → +6.6 V), delivering up to 100 mA output with selectable 25 kHz or 135 kHz oscillator frequency. Its design eliminates inductors, reducing EMI and PCB area - a key capability of the CAT661EVA-T3 in portable and RF applications.
How does the BOOST/FC pin affect CAT661EVA-T3 operation?
The BOOST/FC pin on the CAT661EVA-T3 selects internal oscillator frequency: open circuit yields ~25 kHz (lower quiescent current, larger capacitors required), while connection to V+ raises it to ~135 kHz (higher IQ, smaller capacitors possible). This setting directly impacts output impedance, ripple, and efficiency - a critical configuration step for every CAT661EVA-T3 design.
Can CAT661EVA-T3 operate from a 1.8 V input?
No - the CAT661EVA-T3 requires minimum 1.5 V in inverter mode only when LV is tied to GND, but its guaranteed 100 mA output and full specification compliance begin at 2.5 V input (doubler mode) or 3.0 V (inverter mode with LV open). At 1.8 V, CAT661EVA-T3 may not regulate or deliver rated current; use only within 2.5–5.5 V range per datasheet.
What capacitor types are recommended for CAT661EVA-T3?
Low-ESR tantalum (e.g., AVX TPS series) or aluminum polymer (e.g., Sanyo UGX) capacitors are recommended for CAT661EVA-T3 - especially for C1 (pump cap), where ESR contributes ×4 to effective output resistance. C2 (reservoir cap) should also have ≤0.2 Ω ESR to limit ripple; typical values are 10–150 μF. Ceramic caps are discouraged due to microphonic effects and voltage coefficient issues.
Is CAT661EVA-T3 pin-compatible with older charge pumps?
Yes - the CAT661EVA-T3 is pin-compatible with the ICL7660 and MC34063-based 7660/1044 family in SOIC-8 packages, enabling drop-in upgrades for 100 mA load applications. However, it is not pin-compatible with MAX660 or LTC1044 due to differing pin functions (e.g., LV vs. COMP, BOOST/FC vs. no frequency-select pin), though functional equivalents exist.
CAT661EVA-T3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CAT661EVA-T3 FAQ
1.How can I place an order for CAT661EVA-T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT661EVA-T3 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 CAT661EVA-T3 reliable?
The price and inventory of CAT661EVA-T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT661EVA-T3 is usually 5 days.
3.What payment methods are accepted for CAT661EVA-T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT661EVA-T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT661EVA-T3?
CAT661EVA-T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT661EVA-T3 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 CAT661EVA-T3?
For technical support, including CAT661EVA-T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT661EVA-T3 requirements.
6.How does Aetrix verify that CAT661EVA-T3 is sourced from the original manufacturer or authorized distributors?
All CAT661EVA-T3 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 CAT661EVA-T3 meets industry standards.
7.What is the process for return or replacement of CAT661EVA-T3?
All CAT661EVA-T3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT661EVA-T3, 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 CAT661EVA-T3 part is unused and in its original packaging.
Return procedure for CAT661EVA-T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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