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Analog Devices Inc./Maxim Integrated MAX766CPA+
- Part No.:
- MAX766CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX766CPA+.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
MAX766CPA+ from Maxim Integrated is a high-efficiency, current-limited PFM inverting DC-DC converter with internal P-channel power MOSFET, delivering up to 250mA at -15V output, 120µA max supply current, and 300kHz switching frequency. It operates from 3V to 16V input and supports fixed -15V or adjustable -1V to -16V output via external resistors - ideal for LCD bias generation in portable instrumentation.
For engineers reviewing the MAX766CPA+ datasheet, MAX766CPA+ pinout, MAX766CPA+ application, or MAX766CPA+ equivalent, key selection criteria include its -15V fixed-output capability, ultra-low quiescent current (≤120µA), internal switch architecture, 20V max VIN–VOUT differential, and compatibility with miniature surface-mount magnetics (e.g., 47µH).
Technical Context
The MAX766CPA+ uses a proprietary current-limited pulse-frequency modulation (PFM) control scheme that enforces a 16µs maximum on-time and 2.3µs minimum off-time, enabling high efficiency across light-to-heavy loads. Its BiCMOS process integrates a 0.75A peak-current-rated P-channel MOSFET on die, eliminating external switch requirements.
Operation relies on a 1.5V internal reference (REF) and feedback comparator (FB) comparing VOUT via resistor divider or direct connection to REF. The LX pin swings between V+ (switch ON) and |VOUT| + diode drop (switch OFF), constraining absolute VIN–VOUT differential to ≤21V per Absolute Maximum Ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -15V (±4%) or adjustable from -1V to -16V using external R1/R2 divider |
| Max Output Current | 250mA at -15V with V+ = 5V; derates with higher |VOUT| or lower V+ |
| Supply Current | ≤120µA typical at no load; enables battery-powered operation with multi-year runtime |
| Shutdown Current | ≤5µA at SHDN = V+, allowing deep sleep mode in portable systems |
| Switching Frequency | Up to 300kHz - permits use of <5mm-diameter SMT inductors (e.g., 47µH) |
| Input Voltage Range | 3V to 16V - compatible with single Li-ion, multi-cell alkaline, or regulated 5V/12V rails |
| VIN–VOUT Differential | Max 20V operating / 21V absolute - defines safe operating area for inverter topology |
Pinout & Package
MAX766CPA+ is housed in an 8-pin plastic DIP package (0.300" wide), lead-free and RoHS-compliant per Maxim's standard for C-grade parts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 5) | Ground reference | Common return for all internal circuits and external bypass capacitors |
| V+ (Pins 6, 7) | Positive supply input | Dual-pin connection for low-impedance input path; requires 0.1µF ceramic bypass capacitor placed adjacent to pins |
| LX (Pin 8) | Drain of internal P-MOSFET | Switching node driving external inductor; rated for 0.75A peak current and ≤2.5Ω on-resistance |
| REF (Pin 4) | 1.5V precision reference output | Sources up to 100µA; must be bypassed with 0.1µF capacitor to stabilize feedback loop |
| SHDN (Pin 3) | Active-high shutdown control | TTL/CMOS-compatible; pulls supply current to <5µA when high; tie to GND for normal operation |
| FB (Pin 2) | Feedback input | Connects to REF for fixed -15V output; connects to external resistor divider for adjustable output |
| OUT (Pin 1) | Output sense input | Connected directly to VOUT node to close regulation loop; required for proper error amplifier operation |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables >80% efficiency from 1mA to 250mA load while maintaining <120µA quiescent current |
| Integrated P-channel MOSFET | Eliminates need for external switch; reduces BOM count and layout complexity in space-constrained designs |
| Adjustable output range | -1V to -16V via two-resistor divider - supports custom bias voltages for OLED, TFT-LCD, or sensor interfaces |
| Miniature magnetics support | 300kHz operation allows use of compact 47µH SMT inductors (<5mm diameter), reducing board footprint |
| Low-noise reference | 1.5V REF with ±0.5% accuracy over temperature ensures stable output voltage regulation |
Applications
| Portable Instrumentation | LCD Bias Generation |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes requiring dual-rail supplies from single-cell batteries. IC Role / Device Role / Timing Role: Inverting DC-DC converter generating negative rail (-15V) for op-amp bias and analog front-end circuitry. Use Value: Enables true bipolar operation from 3V–5V inputs while extending battery life via 120µA quiescent current. |
Use Scenario: TFT-LCD modules in industrial HMIs needing precise -15V gate driver voltage. IC Role / Device Role / Timing Role: Fixed-output inverter supplying stable negative bias for source/gate drivers in active-matrix displays. Use Value: Delivers regulated -15V ±4% without external compensation, simplifying display power architecture. |
| Remote Data Acquisition | Battery-Powered Sensors |
Use Scenario: Wireless sensor nodes deployed in field environments with limited access to maintenance or replacement. IC Role / Device Role / Timing Role: Efficient negative voltage generator powering ADC reference buffers and signal conditioning stages. Use Value: Achieves >82% efficiency at 10mA load, minimizing thermal rise and maximizing usable battery capacity. |
Use Scenario: Low-power environmental sensors (e.g., gas, humidity) operating from coin-cell batteries for >5 years. IC Role / Device Role / Timing Role: Ultra-low-IQ inverter providing -15V for precision analog circuitry during periodic wake-up cycles. Use Value: Shutdown current ≤5µA ensures negligible drain during sleep, preserving battery shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX776CPA+ | Same pinout, -15V fixed output, but uses external P-MOSFET drive; supports up to 5W output | Required for >250mA loads or higher negative voltages beyond -16V | Select MAX776CPA+ when output current exceeds 250mA or when higher efficiency at full load is critical |
| LM2662MX/NOPB | Charge-pump inverter (no inductor); max -7V output, 100mA, 170µA IQ, 10kHz switching | Lower noise, smaller solution size, but limited to moderate currents and less negative voltage | Choose LM2662MX/NOPB for ultra-compact, low-EMI designs where -15V and 250mA are not required |
Compared with MAX766CPA+, MAX776CPA+ offers higher power capability via external FET drive but increases component count and layout complexity, while LM2662MX/NOPB trades output voltage range and current for simplicity and EMI performance - making MAX766CPA+ optimal for medium-power, fixed -15V inverter needs.
Availability
MAX766CPA+ is available at Aetrix Electronics and suitable for portable instrumentation, LCD bias generation, remote data-acquisition systems, battery-powered sensors, and industrial HMI designs requiring stable component supply with long-term lifecycle support.
Supply support for MAX766CPA+ 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 (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX764/MAX765/MAX766 family was designed specifically for low-power, inverting DC-DC conversion in space- and energy-constrained applications - emphasizing ultra-low IQ, integrated switching elements, and compatibility with miniature passive components.
FAQ
What is the fixed output voltage of the MAX766CPA+?
The MAX766CPA+ provides a factory-preset fixed output voltage of -15V with ±4% tolerance across temperature and load. This is achieved by connecting the FB pin directly to the REF pin, enabling immediate deployment without external resistor configuration. The MAX766CPA+ does not support other fixed outputs like -5V or -12V - those are exclusive to MAX764CPA+ and MAX765CPA+, respectively.
Can the MAX766CPA+ generate adjustable output voltages?
Yes, the MAX766CPA+ supports adjustable output from -1V to -16V using two external resistors (R1 = 150kΩ recommended, R2 calculated as R1 × |VOUT|/1.5V). The FB pin serves as the feedback node, and the OUT pin must remain connected to the actual VOUT node to maintain regulation accuracy. This flexibility allows tailoring the negative rail for specialized analog or display bias requirements.
What is the maximum allowable input-to-output voltage differential for the MAX766CPA+?
The MAX766CPA+ has an absolute maximum VIN–VOUT differential of +21V, with a recommended operating limit of 20V. For example, with VOUT = -15V, the maximum safe V+ is +5V; with V+ = 16V, VOUT must be ≥ -4V. Exceeding this differential risks permanent damage to the internal P-MOSFET and is strictly prohibited per Absolute Maximum Ratings.
Does the MAX766CPA+ require an external MOSFET?
No, the MAX766CPA+ integrates a P-channel power MOSFET capable of 0.75A peak current, eliminating the need for external switching elements. This distinguishes it from the MAX776CPA+, which drives an external P-FET for higher power. The internal switch enables minimal BOM count and simplified PCB layout - especially valuable in compact portable designs using the MAX766CPA+.
What is the shutdown current specification for the MAX766CPA+?
The MAX766CPA+ draws ≤5µA supply current when SHDN is driven high (≥1.6V), placing the device in deep shutdown mode. During shutdown, the internal reference and bias circuitry are disabled, and the OUT pin discharges to ground. This ultra-low shutdown current makes the MAX766CPA+ suitable for battery-powered applications requiring extended sleep intervals without significant leakage drain.
MAX766CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Negative
- Topology:
- Buck-Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- -1V (-15V)
- Voltage - Output (Max):
- -16V
- Current - Output:
- 105mA
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX766CPA+ FAQ
1.How can I place an order for MAX766CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX766CPA+ 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 MAX766CPA+ reliable?
The price and inventory of MAX766CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX766CPA+ is usually 5 days.
3.What payment methods are accepted for MAX766CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX766CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX766CPA+?
MAX766CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX766CPA+ 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 MAX766CPA+?
For technical support, including MAX766CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX766CPA+ requirements.
6.How does Aetrix verify that MAX766CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX766CPA+ 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 MAX766CPA+ meets industry standards.
7.What is the process for return or replacement of MAX766CPA+?
All MAX766CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX766CPA+, 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 MAX766CPA+ part is unused and in its original packaging.
Return procedure for MAX766CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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