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onsemi CAT660EVA-GT3
- Part No.:
- CAT660EVA-GT3
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CAT660EVA-GT3.pdf
- Description:
- IC REG CHRG PUMP INV 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,801
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Product details
Overview
CAT660EVA-GT3 from onsemi is a 100 mA CMOS charge-pump voltage converter capable of inverting 1.5 V–5.5 V inputs to −1.5 V–−5.5 V outputs or doubling 2.5 V–5.5 V inputs to 5 V–11 V outputs. It operates with only two external capacitors, features selectable 10 kHz/80 kHz oscillator frequency via BOOST/FC pin, and delivers typical 4 Ω output resistance at 100 mA load-enabling low-EMI GaAs FET biasing and LCD contrast generation in portable instrumentation.
For engineers reviewing the CAT660EVA-GT3 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 100 mA output current, dual-mode (inverter/doubler) operation, industrial temperature range (−40°C to +85°C), SOIC-8 package compatibility, and pin compatibility with legacy 7660/1044 designs requiring upgrade paths.
Technical Context
The CAT660EVA-GT3 implements a switched-capacitor topology with internal MOSFET switches controlled by a programmable oscillator. Its BOOST/FC pin selects between 10 kHz (low quiescent current) and 80 kHz (lower output impedance) internal frequencies, while the OSC pin supports external capacitor tuning or clock injection for precise frequency control.
In inverter mode, V+ feeds input, GND serves as reference, and OUT delivers negative voltage; in doubler mode, V+ becomes output, GND becomes input, and OUT serves as ground. The LV pin configures low-voltage operation (<3 V) by connecting to GND, and must be tied to OUT in doubler configuration-ensuring correct internal switch sequencing across both modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100 mA guaranteed - supports rail-to-rail loads without inductor-based regulation |
| Input Voltage Range | 1.5 V–5.5 V (inverter); 2.5 V–5.5 V (doubler) - enables single-cell Li-ion and multi-cell alkaline operation |
| Oscillator Frequency | 10 kHz or 80 kHz selectable - trades quiescent current (0.09–3 mA) vs. capacitor size and ripple |
| Output Resistance | 4 Ω typical at 100 mA - determines voltage drop under load (e.g., 400 mV at full load) |
| Power Efficiency | 92–98% - exceeds switching regulators in low-noise applications due to absence of magnetic components |
| Operating Temperature | −40°C to +85°C - qualified for industrial embedded systems and battery-powered instrumentation |
| Package | SOIC-8 (Case 751BD) - standard footprint compatible with automated PCB assembly |
Pinout & Package
Package: 8-pin SOIC (Case 751BD), 150-mil width, RoHS-compliant, Pb-free, halogen-free/BFR-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST/FC) | Oscillator frequency control | Open = 10 kHz; connected to V+ = 80 kHz - sets trade-off between ESR-sensitive ripple and quiescent current |
| 2 (CAP+) | Positive terminal of pump capacitor C1 | Carries bidirectional 2× load current - requires low-ESR capacitor (≤0.5 Ω) to limit 4× ESR-induced loss |
| 3 (GND) | Ground reference (inverter) / positive input (doubler) | Mode-dependent node - must be routed with low-inductance path to minimize switching noise coupling |
| 4 (CAP−) | Negative terminal of pump capacitor C1 | Completes charge-transfer loop with CAP+ - critical for inversion polarity and doubler start-up stability |
| 5 (OUT) | Negative output (inverter) / ground return (doubler) | Delivers regulated inverted voltage or sinks doubler output current - connects to reservoir capacitor C2 |
| 6 (LV) | Low-voltage enable | Connect to GND for VIN < 3 V (inverter); tie to OUT for all voltages (doubler) - prevents internal switch misfiring |
| 7 (OSC) | Oscillator control input | Accepts external capacitor (frequency reduction) or CMOS/TTL clock (with 100 kΩ pull-up) - output frequency = ½ OSC input |
| 8 (V+) | Positive supply input (inverter) / positive output (doubler) | Primary power rail - supplies internal logic and drives external capacitors; max rating 6 V absolute |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode conversion | Single IC supports both inverter (V+ → −V+) and doubler (V+ → 2V+) topologies - reduces BOM count in multi-rail systems |
| Pin-compatible upgrade | Direct replacement for 7660/1044 with 100 mA capability - no PCB changes required for legacy designs scaling load current |
| Low-EMI operation | No inductor needed - eliminates magnetic field emissions and PCB layout sensitivity common in buck/boost converters |
| Configurable frequency | 10 kHz/80 kHz selection optimizes capacitor size: 150 µF @ 10 kHz vs. 10–22 µF @ 80 kHz for same ripple performance |
| Industrial temperature support | Validated operation from −40°C to +85°C - suitable for automotive infotainment displays and industrial sensors |
Applications
| LCD Contrast Bias | GaAs FET Biasing |
|---|---|
Use Scenario: Generating adjustable negative bias voltage for LCD segment drivers in handheld medical instruments. IC Role / Device Role / Timing Role: Voltage inverter providing stable −3 V to −5 V from 3.3 V microcontroller rail. Use Value: Eliminates need for discrete inductor-based DC/DC, reducing EMI that could interfere with analog sensor front-ends. |
Use Scenario: Supplying precise negative gate bias to GaAs FETs in RF front-end modules for cellular base stations. IC Role / Device Role / Timing Role: Low-noise inverter delivering −5 V at 50 mA with <100 mV ripple under dynamic load. Use Value: Achieves 96% efficiency at 100 mA, minimizing thermal rise near sensitive RF components. |
| Battery Voltage Splitter | Portable Instrumentation Power |
Use Scenario: Deriving symmetrical ±4.5 V rails from a 9 V alkaline battery in handheld multimeters. IC Role / Device Role / Timing Role: Doubler configured as precision voltage divider with ≤0.002% error at <100 nA load. Use Value: Enables true bipolar analog signal conditioning without battery imbalance or premature cutoff. |
Use Scenario: Providing isolated negative supply for op-amp biasing in battery-powered oscilloscope probes. IC Role / Device Role / Timing Role: Inverter operating from 3.7 V Li-ion cell, delivering −3.3 V at 100 mA with 4 Ω output resistance. Use Value: Guarantees 100 mA output current - sufficient to drive multiple rail-to-rail op-amps simultaneously. |
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+ | 100 mA output, 10 kHz fixed frequency, no BOOST/FC pin - higher quiescent current (1.5 mA typ) | Lacks frequency selectability and LV pin control - less flexible for low-ESR capacitor optimization | Choose when design uses fixed 10 kHz operation and legacy MAX660 footprint is mandatory |
| LTC1044CS8#PBF | 80 mA output, 10 kHz fixed frequency, no OSC pin drive capability - lower max output current | Not rated for >85°C ambient - unsuitable for industrial temperature deployments | Choose only for cost-sensitive consumer applications where 80 mA load ceiling is acceptable |
Compared with MAX660CPA+ and LTC1044CS8#PBF, CAT660EVA-GT3 provides higher guaranteed output current (100 mA), selectable oscillator frequency for EMI/capacitor trade-offs, and full industrial temperature qualification - making it the preferred choice for upgraded 7660/1044 designs requiring robustness and flexibility.
Availability
CAT660EVA-GT3 is available at Aetrix Electronics and suitable for LCD contrast biasing, GaAs FET biasing, and portable instrumentation power requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CAT660EVA-GT3 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 supplier specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The CAT660EVA-GT3 belongs to onsemi's charge-pump voltage converter product line, designed specifically to replace inductor-based regulators in space-constrained, low-EMI applications such as portable instrumentation and display biasing.
FAQ
What is the maximum input voltage rating for CAT660EVA-GT3?
The CAT660EVA-GT3 has an absolute maximum V+ to GND rating of 6 V. Operation above this voltage risks permanent damage. For reliable inverter operation, the recommended input range is 1.5 V–5.5 V; for doubler mode, it is 2.5 V–5.5 V. Exceeding 5.5 V violates the Recommended Operating Conditions even if below the 6 V absolute maximum.
Can CAT660EVA-GT3 operate in both inverter and doubler modes simultaneously?
No, CAT660EVA-GT3 operates exclusively in one mode per circuit configuration. Inverter mode requires GND as reference and OUT as negative output; doubler mode reassigns GND as input and V+ as output, with OUT serving as ground. Simultaneous operation is not supported - external wiring defines the mode at power-up.
What capacitor ESR limits are required to achieve the specified 4 Ω output resistance for CAT660EVA-GT3?
To achieve the typical 4 Ω output resistance at 100 mA, the external pump capacitor C1 must have ESR ≤ 0.5 Ω. Higher ESR increases effective output impedance: a 0.5 Ω C1 ESR contributes ≈2 Ω equivalent loss (4 × ESR). Reservoir capacitor C2 should also maintain ESR ≤ 0.2 Ω to limit ripple to ≤87 mV at 100 mA/10 kHz.
Is CAT660EVA-GT3 pin-compatible with the original ICL7660?
Yes, CAT660EVA-GT3 is explicitly documented as pin-compatible with the 7660/1044 family. Pin assignments match exactly: V+, OSC, LV, OUT, BOOST/FC, CAP+, GND, CAP− correspond to pins 1–8 of the SOIC-8 package. This allows direct replacement in existing layouts without PCB modification.
Does CAT660EVA-GT3 require external diodes for startup in doubler mode?
A Schottky diode (e.g., 1N5817) is recommended for startup in doubler mode per Figure 19 of the datasheet, but not required for steady-state operation. The diode assists initial charge transfer when VIN is applied; once C1 and C2 are charged, the internal switches sustain oscillation without diode conduction.
CAT660EVA-GT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA
- Frequency - Switching:
- 10kHz, 80kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CAT660EVA-GT3 FAQ
1.How can I place an order for CAT660EVA-GT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT660EVA-GT3 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 CAT660EVA-GT3 reliable?
The price and inventory of CAT660EVA-GT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT660EVA-GT3 is usually 5 days.
3.What payment methods are accepted for CAT660EVA-GT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT660EVA-GT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT660EVA-GT3?
CAT660EVA-GT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT660EVA-GT3 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 CAT660EVA-GT3?
For technical support, including CAT660EVA-GT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT660EVA-GT3 requirements.
6.How does Aetrix verify that CAT660EVA-GT3 is sourced from the original manufacturer or authorized distributors?
All CAT660EVA-GT3 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 CAT660EVA-GT3 meets industry standards.
7.What is the process for return or replacement of CAT660EVA-GT3?
All CAT660EVA-GT3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT660EVA-GT3, 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 CAT660EVA-GT3 part is unused and in its original packaging.
Return procedure for CAT660EVA-GT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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