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Analog Devices Inc./Maxim Integrated MAX765CPA
- Part No.:
- MAX765CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX765CPA.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,380
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Product details
Overview
MAX765CPA from Maxim Integrated is a high-efficiency, current-limited PFM inverting DC-DC converter delivering -12V output at up to 250mA, operating from 3V to 16V input, with 120µA max supply current and internal P-channel MOSFET. It targets LCD bias generation and portable instrumentation where low quiescent power and compact magnetics are critical.
For engineers reviewing the MAX765CPA datasheet, MAX765CPA pinout, MAX765CPA application, or MAX765CPA equivalent, key selection considerations include its fixed -12V output, 300kHz switching frequency enabling <5mm surface-mount inductors, shutdown current <5µA, and compatibility with standard 47µH inductors and Schottky diodes like 1N5817.
Technical Context
The MAX765CPA uses a BiCMOS current-limited pulse-frequency modulation (PFM) control scheme that enforces a 16µs maximum on-time and 2.3µs minimum off-time, with peak LX current limited to 0.75A. Its internal P-channel MOSFET operates with V+ tied directly to both source pins, maximizing gate drive for low on-resistance.
It functions as an inverting regulator powered by the differential voltage between V+ and VOUT, limiting absolute VIN–VOUT to 21V. The 1.5V reference (REF) sources up to 100µA and enables adjustable output via external resistor divider (FB–REF), though MAX765CPA is factory-configured for -12V fixed output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -12V ±4% (no external feedback required) |
| Input Voltage Range | 3V to 16V - supports single-cell Li-ion, multi-cell alkaline, and industrial 5V/12V rails |
| Max Output Current | 250mA at V+ = 5V; derates with lower input voltage per datasheet graph |
| Supply Current (No Load) | ≤120µA - enables battery life extension in always-on portable systems |
| Shutdown Current | ≤5µA - ensures minimal drain during system sleep modes |
| Switching Frequency | Up to 300kHz - allows use of miniature surface-mount inductors <5mm diameter |
| Peak Switch Current | 0.75A - sets inductor saturation and diode current rating requirements |
Pinout & Package
MAX765CPA is housed in an 8-pin plastic DIP package (0.300" wide), with through-hole mounting and industry-standard lead pitch. 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 | Connected directly to negative output rail; used internally to compare against REF for regulation |
| GND (Pin 5) | Power and signal reference | Common return for input bypass (C1), output filter (C4), and REF bypass (C3); must be star-grounded |
| V+ (Pins 6, 7) | Positive supply input (dual connection) | Both pins must be tied together and decoupled with 0.1µF capacitor close to GND |
| LX (Pin 8) | Drain of internal P-channel MOSFET | Swings from V+ (ON) to |VOUT| + diode drop (OFF); drives external inductor and catch diode |
| REF (Pin 4) | 1.5V precision reference output | Sources up to 100µA; bypassed with 0.1µF capacitor; used with FB for adjustable outputs |
| SHDN (Pin 3) | Active-high shutdown control | TTL/CMOS-compatible; pull to GND for normal operation; >1.6V initiates shutdown (<5µA IQ) |
| FB (Pin 2) | Feedback input | Internally connected to REF for fixed -12V mode; externally biased for adjustable outputs |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables >80% efficiency across 0.1–250mA load range while maintaining <120µA no-load IQ |
| Integrated P-channel MOSFET | Eliminates external switch; reduces BOM count and layout complexity for ≤1.5W inverting supplies |
| 300kHz switching frequency | Permits use of standard 47µH SMT inductors (e.g., Coilcraft DT series) without custom magnetics design |
| Fixed -12V output configuration | Requires no external resistors - simplifies design for LCD bias and dual-rail analog circuitry |
| 21V max V+–VOUT differential | Defines safe operating area: e.g., 5V input → -12V output = 17V differential; 16V input → -12V = 28V (exceeds limit) |
Applications
| LCD Bias Generation | Portable Instrumentation |
|---|---|
Use Scenario: Generating stable negative bias for STN/TN LCD segment drivers in handheld meters and medical monitors. IC Role / Device Role / Timing Role: Inverting DC-DC converter providing regulated -12V rail from a 3.3V or 5V main supply. Use Value: Enables high-contrast display operation with <5µA shutdown current preserving battery runtime between measurements. |
Use Scenario: Powering op-amp rails and ADC references in battery-powered data loggers and field sensors. IC Role / Device Role / Timing Role: Negative voltage generator for dual-supply analog front-ends requiring clean, low-noise -12V. Use Value: Delivers 250mA at -12V with <120µA quiescent draw, extending operational time in intermittent-sampling applications. |
| LAN Adapter Power | Remote Data-Acquisition Systems |
Use Scenario: Supplying isolated -12V 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 solutions with higher current capability. Use Value: Supports 300kHz switching and standard 47µH inductors, reducing board area vs. transformer-based designs. |
Use Scenario: Providing negative supply for sensor signal conditioning and isolation amplifiers in distributed environmental monitoring nodes. IC Role / Device Role / Timing Role: Low-IQ inverter powering isolated analog sections in solar-powered or energy-harvested edge devices. Use Value: Maintains regulation down to 3V input, enabling operation across wide battery discharge curves without brownout. |
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 |
|---|---|---|---|
| MAX775CPA | Same pinout, -12V fixed output, but drives external P-channel MOSFET; supports up to 5W output | Required when >250mA load or higher efficiency at full load is needed; adds external FET and gate driver complexity | Select MAX775CPA only if output current exceeds 250mA or thermal constraints prevent internal switch use. |
| LM2662MX/NOPB | Charge-pump inverter; no inductor; fixed -VIN output; max 100mA; 120µA quiescent current | Suitable only for low-current, low-noise, space-constrained apps; cannot achieve -12V from 5V input without cascading | Choose LM2662MX/NOPB for ultra-low EMI or inductor-free designs below 100mA; not a direct replacement for -12V/250mA demand. |
Compared with MAX765CPA, MAX775CPA offers higher power capability using an external switch but increases component count and layout sensitivity, while LM2662MX/NOPB provides inductorless operation at lower current and lacks fixed -12V output from common input rails.
Availability
MAX765CPA is available at Aetrix Electronics and suitable for LCD-bias generation, portable instrumentation, LAN adapter power, and remote data-acquisition systems requiring stable component supply with long-term industrial temperature support (0°C to +70°C).
Supply support for MAX765CPA 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 family was designed specifically for low-quiescent-current inverting DC-DC conversion in battery-powered and space-constrained systems, emphasizing efficiency across wide load ranges without external magnetics design.
FAQ
What output voltage does the MAX765CPA deliver?
The MAX765CPA delivers a factory-trimmed fixed output voltage of -12V ±4%, achieved without external feedback components. This is confirmed in the Ordering Information table and Electrical Characteristics section under "MAX765C/E, -11.52V ≤ VOUT ≤ -12.48V" at nominal conditions. The device uses internal resistor division tied to the 1.5V reference to set this value.
Can the MAX765CPA be configured for adjustable output voltage?
Yes, the MAX765CPA can be reconfigured for adjustable output from -1V to -16V by disconnecting FB from REF and connecting an external resistor divider between OUT, FB, and GND - as shown in Figure 3 of the datasheet. However, the MAX765CPA variant is shipped and tested for fixed -12V operation; adjustment requires modifying the feedback network.
What is the maximum allowable input-to-output voltage differential for the MAX765CPA?
The MAX765CPA has an absolute maximum V+ to VOUT differential of +21V, as specified in the Absolute Maximum Ratings table. For example, applying 16V to V+ requires VOUT ≥ -5V to stay within limit; delivering -12V therefore restricts maximum V+ to 9V (9V – (–12V) = 21V). Exceeding this risks permanent damage.
Which inductor value is recommended for typical MAX765CPA applications?
A 47µH inductor is explicitly recommended as ideal for most MAX765CPA applications, per the General Description and Design Procedure sections. It supports both continuous and discontinuous conduction modes, works with standard surface-mount parts (e.g., Coilcraft DT series), and avoids excessive peak current or core saturation given the 0.75A switch limit.
Does the MAX765CPA require an input bypass capacitor, and if so, what value?
Yes, the MAX765CPA requires a 0.1µF ceramic capacitor (C2) placed as close as possible between V+ (pins 6/7) and GND (pin 5), per the Pin Description and Layout Considerations sections. Additionally, a bulk input capacitor (C1) of 100–120µF, 20V-rated low-ESR type (e.g., Sanyo OS-CON) is recommended for loads up to 250mA to suppress switching noise and supply ripple.
MAX765CPA 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 (-12V)
- Voltage - Output (Max):
- -16V
- Current - Output:
- 120mA
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX765CPA FAQ
1.How can I place an order for MAX765CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX765CPA 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 MAX765CPA reliable?
The price and inventory of MAX765CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX765CPA is usually 5 days.
3.What payment methods are accepted for MAX765CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX765CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX765CPA?
MAX765CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX765CPA 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 MAX765CPA?
For technical support, including MAX765CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX765CPA requirements.
6.How does Aetrix verify that MAX765CPA is sourced from the original manufacturer or authorized distributors?
All MAX765CPA 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 MAX765CPA meets industry standards.
7.What is the process for return or replacement of MAX765CPA?
All MAX765CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX765CPA, 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 MAX765CPA part is unused and in its original packaging.
Return procedure for MAX765CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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