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Analog Devices Inc./Maxim Integrated MAX766EPA+
- Part No.:
- MAX766EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX766EPA+.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,097
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Product details
Overview
MAX766EPA+ from Maxim Integrated is a high-efficiency, current-limited PFM inverting DC-DC converter delivering -15V fixed output or adjustable from -1V to -16V, with 250mA output current, 120µA max supply current, and 300kHz switching frequency-used in portable instruments and LCD-bias generation where low quiescent power and compact magnetics are critical.
For engineers reviewing the MAX766EPA+ datasheet, MAX766EPA+ pinout, MAX766EPA+ application, or MAX766EPA+ equivalent, this page delivers verified technical context, exact pin functions, real-world operating constraints (e.g., 20V max VIN–VOUT differential), and validated alternative parts for -15V inverting supply designs.
Technical Context
The MAX766EPA+ employs a BiCMOS current-limited pulse-frequency-modulated (PFM) control scheme that enforces peak LX current at 0.75A and uses dual one-shots to constrain maximum on-time to 16µs and minimum off-time to 2.3µs-enabling both continuous conduction at heavy loads and ultra-low 5µA shutdown current. Its internal P-channel MOSFET eliminates external switch requirements.
Operation relies on a 1.5V precision reference (±1% over temperature) and feedback sensing via the FB pin; fixed-output mode ties FB to REF, while adjustable mode uses an external resistor divider. Input-to-output differential is limited to 21V absolute maximum, constraining usable VIN–VOUT combinations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -15V ±4% (or adjustable -1V to -16V using external resistors) |
| Max Output Current | 250mA at V+ = 5V; derates with input voltage per datasheet curves |
| Supply Current | 120µA max (no load, full operating range); enables battery-powered longevity |
| Shutdown Current | 5µA max (SHDN high); ensures near-zero drain during sleep modes |
| Switching Frequency | Up to 300kHz; permits use of <5mm surface-mount inductors (e.g., 47µH) |
| Input Voltage Range | 3V to 16V; requires VIN–VOUT ≤20V for safe operation |
| Reference Voltage | 1.500V ±10mV (TMIN to TMAX); stable basis for precision feedback |
Pinout & Package
MAX766EPA+ 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; pin 5 is GND; pins 6 and 7 are tied V+ inputs; pin 8 is LX (switch node).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Inverting output sense node | Connects directly to VOUT for fixed-output regulation; sets feedback reference point |
| GND (Pin 5) | Power and signal ground reference | Star-ground connection point for C1, C4, and layout noise control |
| V+ (Pins 6, 7) | Positive supply input (dual pins) | Must be shorted externally; requires 0.1µF bypass capacitor placed adjacent to pins |
| LX (Pin 8) | Drain of internal P-channel MOSFET | Swings from V+ (ON) to |VOUT| + diode drop (OFF); peak current limited to 0.75A |
| REF (Pin 4) | 1.5V precision reference output | Sources up to 100µA; bypassed with 0.1µF capacitor for stability |
| SHDN (Pin 3) | Active-high shutdown control | TTL/CMOS-compatible; pulls supply current to <5µA when high |
| FB (Pin 2) | Feedback input | Connected to REF for fixed -15V; used with R1/R2 divider for adjustable output |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables >80% efficiency across 0.1–250mA load range without PWM complexity or high IQ |
| Integrated P-channel MOSFET | Eliminates external switch; reduces BOM count and layout area for <5W applications |
| 2.3µs minimum off-time + 16µs max on-time | Guarantees controlled discontinuous/continuous transition and prevents subharmonic oscillation |
| 1.5V ±1% reference | Supports accurate output setting across -40°C to +85°C without external trimming |
| 21V absolute max VIN–VOUT differential | Defines safe operating area-e.g., 16V input only supports down to -5V output, not -15V |
Applications
| LCD Bias Generation | Portable Instrument Power |
|---|---|
Use Scenario: Generating negative bias for STN/TN LCD panels in handheld meters and test equipment. IC Role / Device Role / Timing Role: Inverting DC-DC converter providing stable -15V rail from single 5V or 9V battery source. Use Value: 120µA quiescent current extends battery life; 300kHz switching allows miniature 47µH inductor footprint. |
Use Scenario: Powering analog front-ends and display drivers in battery-operated multimeters and data loggers. IC Role / Device Role / Timing Role: Primary negative supply generator with shutdown control synchronized to measurement cycles. Use Value: 5µA shutdown current minimizes standby drain; fixed -15V output avoids calibration drift from resistor tolerances. |
| LAN Adapter Interface | Remote Data-Acquisition System |
Use Scenario: Providing isolated -12V/-15V for RS-232 transceivers or Ethernet PHY bias in compact network interface cards. IC Role / Device Role / Timing Role: Compact inverting regulator replacing discrete charge-pump or transformer-based solutions. Use Value: Internal MOSFET and 8-pin DIP simplify layout; 250mA output supports multiple transceiver ICs simultaneously. |
Use Scenario: Supplying sensor signal conditioning circuitry (e.g., op-amps, ADC references) in field-deployed environmental monitors. IC Role / Device Role / Timing Role: Negative rail generator tolerant of wide input voltage swings (3V–16V) from solar or battery sources. Use Value: 3V min input enables operation down to nearly depleted batteries; -40°C to +85°C rating ensures reliability in uncontrolled environments. |
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 |
|---|---|---|---|
| MAX776EPA+ | Same pinout, -15V fixed output, but drives external P-channel MOSFET; supports up to 5W output | Required when >250mA load or higher efficiency at >100mA is needed | Select MAX776EPA+ if output drive exceeds MAX766EPA+'s 250mA limit or thermal budget demands external FET heat spreading |
| LM2662MX/NOPB | Charge-pump inverter (no inductor); fixed -VIN output; 100mA max; 170µA IQ | Used where ultra-low EMI and zero inductor size are prioritized over efficiency or current capability | Choose LM2662MX/NOPB only for low-noise, space-constrained, sub-100mA applications-cannot replace MAX766EPA+ in 250mA or high-efficiency roles |
Compared with MAX766EPA+, MAX776EPA+ offers higher power delivery via external switch but increases component count and layout complexity, while LM2662MX/NOPB trades output current and efficiency for inductor-free simplicity-making MAX766EPA+ optimal for medium-current, high-efficiency inverting supplies with minimal external parts.
Availability
MAX766EPA+ is available at Aetrix Electronics and suitable for LCD-bias generation, portable instrument power, and remote data-acquisition systems requiring stable component supply, extended temperature operation (-40°C to +85°C), and long-term industrial availability.
Supply support for MAX766EPA+ 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) designs precision analog and mixed-signal ICs for power management, sensing, and communication applications.
The MAX764/MAX765/MAX766 family was engineered specifically for low-IQ, inverting DC-DC conversion in battery-powered and space-constrained systems-prioritizing efficiency across wide load ranges without sacrificing simplicity.
FAQ
What is the maximum allowable input-to-output voltage differential for MAX766EPA+?
The MAX766EPA+ has an absolute maximum VIN–VOUT differential of 21V, but the recommended operating limit is 20V to ensure reliability. For example, with a -15V output, the maximum safe input voltage is +5V; applying 16V input would exceed the 20V differential and risk damage. Always verify VIN–|VOUT| ≤20V in your design.
Can MAX766EPA+ be configured for adjustable output voltage?
Yes, MAX766EPA+ supports adjustable output from -1V to -16V using two external resistors (R1 = 150kΩ, R2 calculated per VOUT = -1.5V × (1 + R2/R1)). The FB pin replaces the internal divider; tie FB to REF only for fixed -15V operation. This flexibility allows precise matching to system-level analog supply requirements.
What is the peak current limit at the LX pin of MAX766EPA+?
The MAX766EPA+ limits peak current at the LX pin to 0.75A, as confirmed in the Electrical Characteristics table and Typical Operating Characteristics plots. This current limit defines maximum inductor energy storage and enables continuous-conduction mode at heavy loads-critical for maintaining >80% efficiency above 100mA.
Does MAX766EPA+ require an input bypass capacitor, and where should it be placed?
Yes, MAX766EPA+ requires a 120µF low-ESR input capacitor (C1) rated ≥20V, plus a 0.1µF ceramic capacitor (C2) placed directly between V+ (pins 6/7) and GND (pin 5). C2 must be located within 2mm of the pins to suppress high-frequency switching noise and prevent instability-layout compliance is essential for reliable operation.
How does shutdown mode affect the output voltage of MAX766EPA+?
When SHDN is driven high, MAX766EPA+ enters shutdown mode and disables the internal reference and switching circuitry, causing the OUT pin to discharge toward GND through internal paths. The output voltage collapses to near 0V, and supply current drops to ≤5µA-enabling true zero-power hold states in battery-critical applications.
MAX766EPA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX766EPA+ FAQ
1.How can I place an order for MAX766EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX766EPA+ 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 MAX766EPA+ reliable?
The price and inventory of MAX766EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX766EPA+ is usually 5 days.
3.What payment methods are accepted for MAX766EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX766EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX766EPA+?
MAX766EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX766EPA+ 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 MAX766EPA+?
For technical support, including MAX766EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX766EPA+ requirements.
6.How does Aetrix verify that MAX766EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX766EPA+ 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 MAX766EPA+ meets industry standards.
7.What is the process for return or replacement of MAX766EPA+?
All MAX766EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX766EPA+, 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 MAX766EPA+ part is unused and in its original packaging.
Return procedure for MAX766EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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