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Analog Devices Inc./Maxim Integrated MAX765MJA
- Part No.:
- MAX765MJA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
MAX765MJA.pdf
- Description:
- IC REG BUCK BST ADJ/-1V 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,599
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Product details
Overview
The MAX765MJA from Maxim Integrated is a high-efficiency, current-limited pulse-frequency-modulated (PFM) inverting DC-DC converter delivering -12V output at up to 250mA, with 120µA max supply current and 3V–16V input range. It integrates a P-channel power MOSFET, operates up to 300kHz, and targets battery-powered portable instruments and remote data-acquisition systems requiring stable negative bias.
For engineers reviewing the MAX765MJA datasheet, MAX765MJA pinout, MAX765MJA application, or MAX765MJA equivalent, key selection criteria include its -12V fixed output, MIL-grade CERDIP-8 packaging (-55°C to +125°C), internal MOSFET architecture, shutdown current <5µA, and compatibility with standard 47µH surface-mount inductors.
Technical Context
The MAX765MJA employs a BiCMOS current-limited PFM control scheme combining peak-current limiting (0.75A) with programmable on-time (max 16µs) and off-time (min 2.3µs) one-shots. This enables continuous-conduction mode at heavy loads while maintaining ultra-low quiescent current under light loads.
It operates as an inverting regulator powered by the differential voltage between V+ and OUT, applying full gate drive to its internal P-channel MOSFET to minimize on-resistance. The absolute maximum VIN–VOUT differential is 21V, and output regulation is enforced via a 1.5V reference and feedback comparator monitoring the FB pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -12V (±4% over temperature and load) |
| Input Voltage Range | 3V to 16V - supports single-cell Li-ion up to 4S battery stacks |
| Max Output Current | 250mA - limited by 0.75A peak LX current and thermal derating in CERDIP |
| Supply Current | 120µA max - enables multi-year battery life in low-duty-cycle instrumentation |
| Shutdown Current | 5µA max - ensures negligible drain during system sleep modes |
| Switching Frequency | Up to 300kHz - allows use of <5mm-diameter SMT inductors (e.g., 47µH) |
| Operating Temperature | -55°C to +125°C - qualified per MIL-STD-883 for aerospace and downhole applications |
| Reference Voltage | 1.500V ±30mV - provides precision feedback for stable -12V regulation |
Pinout & Package
MAX765MJA is housed in an 8-pin CERDIP package (hermetically sealed ceramic dual in-line) with 0.3-inch width and 0.1-inch lead pitch, rated for harsh-environment operation including extended temperature cycling and high reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 5) | Ground reference | Common return path for REF, SHDN, FB, and internal bias circuits |
| V+ (Pins 6,7) | Positive supply input | Dual-pin connection for low-impedance input routing; requires 0.1µF bypass capacitor near pins |
| LX (Pin 8) | Drain of internal P-MOSFET | Switching node driving external inductor; peak current limited to 0.75A |
| REF (Pin 4) | 1.5V precision reference output | Sources up to 100µA; must be bypassed with 0.1µF capacitor for stability |
| SHDN (Pin 3) | Active-high shutdown control | TTL/CMOS-compatible; pulls supply current below 5µA when high |
| FB (Pin 2) | Feedback input | Connected to REF for fixed -12V output; used with external divider for adjustable mode |
| OUT (Pin 1) | Output sense input | Connects directly to VOUT to close regulation loop in fixed-output configuration |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables >80% efficiency across 0.1–250mA load range without external compensation |
| Integrated P-channel MOSFET | Eliminates external switch and gate driver, reducing BOM count and layout complexity |
| Ultra-low IQ (120µA) | Extends battery runtime in portable instruments where standby current dominates lifetime |
| MIL-grade CERDIP packaging | Ensures long-term reliability in high-vibration, wide-temperature, and radiation-prone environments |
| Adjustable output option (-1V to -16V) | Permits reuse across multiple voltage rails using only two external resistors (R1=150kΩ, R2 calculated) |
Applications
| LCD-Bias Generators | Portable Instruments |
|---|---|
Use Scenario: Generating stable -12V bias for STN or TFT LCD segment drivers in handheld test meters. IC Role / Device Role / Timing Role: Inverting DC-DC converter providing regulated negative rail isolated from main system supply. Use Value: Enables compact, battery-operated displays with consistent contrast across temperature via precise -12V output and low-load IQ. |
Use Scenario: Powering analog front-ends and ADC references in field-deployable multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Primary negative supply generator for op-amps and precision references requiring clean, low-noise -12V. Use Value: Delivers 250mA at >82% efficiency with <50mV ripple using standard 47µH inductor and OS-CON output cap. |
| LAN Adapters | Remote Data-Acquisition Systems |
Use Scenario: Supplying isolated -12V to RS-232 transceivers or Ethernet PHY bias circuits in industrial LAN modules. IC Role / Device Role / Timing Role: Compact, efficient inverter replacing discrete charge-pump solutions in space-constrained adapter PCBs. Use Value: Reduces component count vs. transformer-based designs while meeting EMI limits via 300kHz fixed-frequency switching. |
Use Scenario: Providing conditioned -12V for sensor signal conditioning and isolation amplifiers in oilfield or environmental monitoring nodes. IC Role / Device Role / Timing Role: Harsh-environment power stage operating continuously at -40°C to +125°C ambient. Use Value: CERDIP packaging and guaranteed -55°C to +125°C operation ensure uninterrupted data logging in uncontrolled outdoor enclosures. |
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 |
|---|---|---|---|
| MAX775MJA | Same pinout, -12V fixed output, but drives external P-MOSFET; supports up to 5W output | Used where higher output current (>250mA) or adjustable output beyond -16V is required | Select MAX775MJA only if load exceeds 250mA or external FET control is needed for thermal management |
| LM2662MX/NOPB | Charge-pump inverter; no inductor required; max -10V @ 100mA; IQ = 170µA | Suitable for low-current, space-constrained apps where inductor-free design is prioritized over efficiency | Choose LM2662MX/NOPB only for sub-100mA loads where board area is critical and efficiency >80% is not required |
Compared with MAX765MJA, MAX775MJA offers higher power capability at the cost of added external components and layout complexity, while LM2662MX/NOPB trades efficiency and output current for inductorless simplicity-making MAX765MJA optimal for ruggedized 250mA -12V applications demanding best-in-class IQ and thermal performance.
Availability
MAX765MJA is available at Aetrix Electronics and suitable for LCD-bias generators, portable instrumentation, and remote data-acquisition systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX765MJA 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, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.
The MAX764/MAX765/MAX766 family was engineered specifically for high-efficiency, low-quiescent-current inverting DC-DC conversion in battery-powered and harsh-environment systems - with MAX765MJA targeting military, aerospace, and downhole instrumentation.
FAQ
What is the output voltage specification of the MAX765MJA?
The MAX765MJA provides a fixed -12V output voltage with ±4% tolerance over full temperature range (-55°C to +125°C) and load conditions (0–250mA). This is achieved using an internal resistor divider tied to the 1.5V reference; no external components are needed for fixed-output operation. The MAX765MJA datasheet confirms -11.52V to -12.48V output bounds under all specified operating conditions.
Does the MAX765MJA require an external MOSFET?
No, the MAX765MJA integrates a P-channel power MOSFET internally - confirmed by its block diagram, pinout (LX pin), and electrical specs listing 0.75A peak LX current. This eliminates the need for external switching elements, distinguishing it from the MAX775MJA, which drives an external P-MOSFET. The MAX765MJA's internal switch enables minimal BOM count and simplified layout for 250mA-class inverting supplies.
What package type and temperature range does the MAX765MJA use?
The MAX765MJA is supplied in an 8-pin CERDIP (ceramic dual in-line package) with hermetic sealing, rated for -55°C to +125°C operation. This packaging meets MIL-STD-883 requirements for reliability in aerospace, defense, and industrial applications. The ordering information table explicitly lists "MAX765MJA" with "8 CERDIP**" and "-55°C to +125°C", confirming its extended-temperature qualification.
Can the MAX765MJA be configured for adjustable output voltages?
Yes, the MAX765MJA supports adjustable output from -1V to -16V using an external resistor divider on the FB pin, as described in the "Setting the Output Voltage" section. While the device is preset for -12V, connecting FB to REF yields fixed output; replacing that connection with R1 (150kΩ) and R2 (calculated per VOUT = -1.5 × (1 + R2/R1)) enables full-range adjustment. This dual-mode capability is shared across the MAX764/MAX765/MAX766 family.
What is the maximum allowable voltage difference between V+ and OUT for the MAX765MJA?
The MAX765MJA has an absolute maximum differential voltage rating of +21V between V+ and OUT, as stated in the Absolute Maximum Ratings table. This limit arises from the internal P-MOSFET's breakdown voltage and gate-drive constraints. Exceeding this differential risks permanent damage - for example, applying V+ = 16V with VOUT = -15V yields |21V|, which is the upper boundary. Designers must ensure (V+) − (VOUT) ≤ 21V in all operating and transient conditions.
MAX765MJA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-CDIP (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):
- 3.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- -1V (-12V)
- Voltage - Output (Max):
- -16V
- Current - Output:
- 250mA
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
MAX765MJA FAQ
1.How can I place an order for MAX765MJA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX765MJA 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 MAX765MJA reliable?
The price and inventory of MAX765MJA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX765MJA is usually 5 days.
3.What payment methods are accepted for MAX765MJA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX765MJA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX765MJA?
MAX765MJA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX765MJA 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 MAX765MJA?
For technical support, including MAX765MJA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX765MJA requirements.
6.How does Aetrix verify that MAX765MJA is sourced from the original manufacturer or authorized distributors?
All MAX765MJA 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 MAX765MJA meets industry standards.
7.What is the process for return or replacement of MAX765MJA?
All MAX765MJA units undergo pre-shipment inspection (PSI). If there is an issue with MAX765MJA, 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 MAX765MJA part is unused and in its original packaging.
Return procedure for MAX765MJA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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