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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:4,958
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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, internal switch architecture, and compatibility with miniature surface-mount magnetics in space-constrained battery-powered systems.
Technical Context
The MAX766CPA implements a proprietary current-limited pulse-frequency modulation (PFM) control scheme that enforces peak inductor current limiting (0.75A), maximum on-time (16µs), and minimum off-time (2.3µs) to maintain regulation across load currents from light to full scale. This enables both discontinuous and continuous conduction modes without external compensation.
It uses an internal P-channel MOSFET with 1.4Ω typical on-resistance and draws only 120µA no-load supply current-significantly lower than PWM alternatives-while achieving >82% efficiency at 10–100mA loads with VIN = 5V and VOUT = -15V. The 1.5V reference (±1% over temperature) feeds the FB comparator for precise output voltage sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -15V ±4% (or adjustable -1V to -16V using R1/R2 divider) |
| Max Output Current | 250mA at VIN ≥ 5V; derates to ~150mA at VIN = 3V per graph |
| Supply Current | 120µA max (no load); <5µA in shutdown mode |
| Switching Frequency | Up to 300kHz - enables use of <5mm-diameter SMT inductors (e.g., 47µH) |
| Input Voltage Range | 3V to 16V - supports single-cell Li-ion, multi-cell alkaline, and regulated 5V/12V rails |
| VIN–VOUT Differential | Max 20V - constrains absolute operating range (e.g., VIN = 16V → VOUT ≥ -4V) |
| Reference Voltage | 1.5V ±1% (TA = -40°C to +85°C) - sets feedback threshold for output regulation |
Pinout & Package
MAX766CPA is housed in an 8-pin plastic DIP package (0.300" wide), with through-hole mounting and industry-standard lead spacing. Pin 1 is OUT (output sense), Pin 2 is FB (feedback input), Pin 3 is SHDN (active-high shutdown), Pin 4 is REF (1.5V reference output), Pin 5 is GND, Pins 6 and 7 are V+ (tied together, positive supply input), and Pin 8 is LX (drain of internal P-channel MOSFET).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Output voltage sense node | Connects directly to VOUT for fixed-output operation; enables accurate regulation without external resistor divider |
| FB (Pin 2) | Inverting input of error amplifier | Tied to REF for fixed -15V output; used with R1/R2 for adjustable output configuration |
| SHDN (Pin 3) | Active-high enable/disable control | Drives device into <5µA shutdown when logic-high; connect to GND for normal operation |
| REF (Pin 4) | 1.5V precision reference output | Sources up to 100µA; requires 0.1µF bypass capacitor to GND for stability |
| GND (Pin 5) | Power and signal ground reference | Star-ground connection point for C1, C4, and LX return path to minimize noise |
| V+ (Pins 6, 7) | Positive supply input (dual pins) | Must be tied together externally; requires 0.1µF ceramic bypass capacitor placed adjacent to pins |
| LX (Pin 8) | Drain of internal P-channel MOSFET | Swings between VIN and ~|VOUT| + diode drop; drives external inductor and catch diode |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables >82% efficiency across 0.1–250mA loads while maintaining <120µA quiescent current |
| Internal P-channel MOSFET | Eliminates need for external switch; 1.4Ω on-resistance reduces component count and layout complexity |
| Adjustable output range | -1V to -16V via two-resistor divider - supports custom bias voltages for diverse display technologies |
| Miniature magnetics support | 300kHz operation allows standard 47µH SMT inductors (<5mm diameter), reducing board area vs. low-frequency designs |
| Low-noise reference | 1.5V ±1% reference with <100Ω output impedance - ensures stable feedback under varying load conditions |
Applications
| LCD-Bias Generators | Portable Instruments |
|---|---|
Use Scenario: Generating negative bias voltage for STN/TN LCD panels in handheld meters and medical monitors. IC Role / Device Role / Timing Role: Inverting DC-DC converter providing stable -15V rail from single 5V supply. Use Value: Enables compact, low-power display subsystems with no external MOSFET or compensation network required. | Use Scenario: Powering analog front-ends and sensor interfaces in battery-operated multimeters and data loggers. IC Role / Device Role / Timing Role: High-efficiency negative supply generator supporting rail-to-rail op-amps and ADC references. Use Value: Extends battery life via 120µA quiescent current and maintains regulation down to 3V input. |
| LAN Adapters | Remote Data-Acquisition Systems |
Use Scenario: Providing isolated negative voltage for RS-232 transceivers and Ethernet PHY biasing in embedded networking modules. IC Role / Device Role / Timing Role: Fixed-output inverter delivering -15V at up to 250mA for interface ICs requiring dual supplies. Use Value: Simplifies BOM by integrating switch and control, eliminating discrete FET drivers and gate charge pumps. | Use Scenario: Supplying precision negative bias for op-amp signal conditioning stages in industrial sensor nodes. IC Role / Device Role / Timing Role: Low-noise, temperature-stable inverter supporting 0°C to +70°C commercial operation. Use Value: Delivers ±4% output accuracy over temperature without trimming, reducing calibration overhead. |
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, same -15V fixed output, but rated for -40°C to +85°C industrial temp range and higher reliability screening | Required for extended temperature operation beyond 0°C to +70°C; identical electrical specs otherwise | Select MAX776CPA when operating in industrial environments or requiring wider thermal margin |
| LM2662CMX/NOPB | Charge-pump inverter (no inductor), 200mA max, -5V fixed output only, 170µA quiescent current | Suitable only for low-current, low-noise, inductor-free applications; cannot achieve -15V or >200mA | Choose LM2662CMX/NOPB only if board space prohibits inductors and -15V is not required |
Compared with MAX776CPA, the MAX766CPA offers identical functionality at lower cost and qualification level for commercial-grade applications; compared with LM2662CMX/NOPB, it delivers higher output current, adjustable voltage, and superior efficiency at medium-to-heavy loads-but requires an external inductor and diode.
Availability
MAX766CPA is available at Aetrix Electronics and suitable for LCD-bias generators, portable instrumentation, and remote data-acquisition systems requiring stable component supply with consistent parametric performance across production lots.
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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX764/MAX765/MAX766 product line was designed specifically for low-quiescent-current, inductor-based negative voltage generation in battery-powered and space-constrained systems-emphasizing simplicity, efficiency, and minimal external component count.
FAQ
What is the fixed output voltage of the MAX766CPA?
The MAX766CPA is factory-configured for a fixed -15V output with ±4% tolerance across temperature and load. This is achieved by internally connecting the FB pin to the 1.5V reference; no external resistors are needed for this configuration. The MAX766CPA datasheet confirms VOUT = -15V under conditions of 3V ≤ VIN ≤ 16V and 0mA ≤ ILOAD ≤ 100mA.
Can the MAX766CPA be used to generate an adjustable output voltage?
Yes, the MAX766CPA supports adjustable output from -1V to -16V using an external resistor divider between OUT and REF, with FB connected to the divider midpoint. Select R1 = 150kΩ and calculate R2 = R1 × |VOUT| / 1.5V. This configuration is explicitly validated in the MAX766CPA datasheet's Figure 3 and Design Procedure section.
What is the maximum allowable input-to-output differential voltage for the MAX766CPA?
The MAX766CPA has an absolute maximum VIN–VOUT differential of 20V. For example, with VOUT = -15V, VIN must not exceed +5V; with VIN = 16V, VOUT must be ≥ -4V. This limit is defined in the Absolute Maximum Ratings table and enforced by the LX pin voltage swing constraints.
Does the MAX766CPA require an external MOSFET?
No, the MAX766CPA integrates a P-channel power MOSFET with 1.4Ω typical on-resistance at the LX pin, eliminating the need for any external switching transistor. This is confirmed in the General Description, Features list, and Pin Description sections of the MAX766CPA datasheet.
What is the shutdown current specification for the MAX766CPA?
The MAX766CPA draws less than 5µA of supply current in shutdown mode when the SHDN pin is driven high. This value is specified in the Electrical Characteristics table under "ISHDN Shutdown Current" and verified across the 0°C to +70°C operating temperature range for the MAX766CPA grade.
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:
- Obsolete
- 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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