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Analog Devices Inc./Maxim Integrated MAX765EPA+
- Part No.:
- MAX765EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX765EPA+.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,052
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Product details
Overview
The MAX765EPA+ from Maxim Integrated is a -12V fixed-output, high-efficiency, low-quiescent-current inverting DC-DC switching regulator with internal P-channel power MOSFET, 3V–16V input range, 250mA output current capability, and 120µA max supply current-designed for battery-powered portable instruments and LCD bias generation.
For engineers reviewing the MAX765EPA+ datasheet, MAX765EPA+ pinout, MAX765EPA+ application, or MAX765EPA+ equivalent, key selection considerations include its current-limited PFM control scheme, -12V preset output, 8-pin PDIP package, shutdown current <5µA, and compatibility with miniature 47µH surface-mount inductors.
Technical Context
The MAX765EPA+ implements a proprietary current-limited pulse-frequency-modulated (PFM) control architecture that enforces a 16µs maximum on-time and 2.3µs minimum off-time, enabling >80% efficiency across 0.1–250mA loads while maintaining ultra-low 120µA no-load supply current. Its BiCMOS process integrates a 0.75A peak-current-rated P-channel MOSFET switch and a precision 1.5V reference.
Operation relies on differential voltage between V+ and OUT to drive the internal switch gate, limiting VIN–VOUT differential to ≤20V. Output regulation uses feedback via FB tied to REF for fixed -12V operation or an external resistor divider for adjustable outputs from -1V to -16V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | -12V fixed (±4% tolerance); no external resistor required for nominal operation |
| 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 input voltage per published curves |
| Supply Current (No Load) | ≤120µA typical; enables >1-year battery life in low-duty-cycle portable systems |
| Shutdown Current | ≤5µA max; ensures negligible drain during system sleep modes |
| Switching Frequency | Up to 300kHz; allows use of compact <5mm-diameter SMT inductors (e.g., 47µH) |
| Peak Switch Current | 0.75A; supports continuous conduction mode up to full rated load |
| Reference Voltage | 1.500V ±30mV (TYP); stable over -40°C to +85°C for accurate feedback design |
Pinout & Package
MAX765EPA+ is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch width, through-hole mounting, and industry-standard pin spacing. Pin 1 is OUT; pin 5 is GND; pins 6 and 7 are V+ (must be tied together); pin 8 is LX.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Inverting output node | Connects to negative output rail; senses regulated -12V via internal divider when FB tied to REF |
| GND (Pin 5) | Power and signal reference | Star-ground connection point for input/output capacitors and feedback network |
| V+ (Pins 6, 7) | Positive input supply | Dual pins reduce trace resistance; requires 0.1µF bypass capacitor placed adjacent to both pins |
| LX (Pin 8) | Drain of internal P-MOSFET | Swings from V+ (ON) to |VOUT| + diode drop (OFF); drives external inductor/diode stage |
| 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 to <5µA when logic high |
| FB (Pin 2) | Feedback input | Connected to REF for fixed -12V; connects to external resistor divider for adjustable output |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Combines 16µs max on-time and 2.3µs min off-time to sustain >80% efficiency from 100µA to 250mA load |
| Integrated P-channel MOSFET | 0.75A peak current rating eliminates external switch; reduces BOM count and layout complexity |
| Ultra-low quiescent current | 120µA max supply current enables long runtime in battery-critical applications like remote data acquisition |
| Adjustable output option | Supports -1V to -16V via two-resistor divider (R1 = 150kΩ, R2 = 150kΩ × |VOUT|/1.5V) |
| Robust thermal performance | Rated for -40°C to +85°C ambient; 150°C max junction temperature ensures reliability in sealed enclosures |
Applications
| LCD Bias Generation | Portable Instrument Power |
|---|---|
Use Scenario: Generating stable negative bias voltage for TFT-LCD segment drivers in handheld 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: Eliminates need for external inverter IC or charge pump; achieves >82% efficiency at 100mA load with minimal ripple. |
Use Scenario: Powering analog front-end circuitry (op-amps, ADC references) in battery-operated handheld multimeters. IC Role / Device Role / Timing Role: Primary negative supply generator delivering clean -12V with <5µA shutdown current during measurement standby. Use Value: Extends AA/AAA battery life by minimizing no-load draw; maintains regulation across 3V–16V input variation. |
| LAN Adapter Interface | Remote Data-Acquisition System |
Use Scenario: Providing isolated -12V bias for RS-232 transceivers and Ethernet PHY level-shifting in compact LAN adapters. IC Role / Device Role / Timing Role: Compact inverting regulator operating from 5V USB or PoE-derived input to generate compliant RS-232 voltage levels. Use Value: Enables full-duplex serial communication without external transformers or discrete charge pumps. |
Use Scenario: Supplying sensor interface circuitry (e.g., strain gauge bridges, thermocouple amps) in unattended field-deployed data loggers. IC Role / Device Role / Timing Role: Low-IQ inverter powering precision analog stages from primary 9V or 12V battery packs. Use Value: Delivers stable -12V with <10mVpp ripple under dynamic load; supports 5+ year deployment on primary lithium thionyl chloride cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting DC-DC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX765ESA+ | Same electrical specs but in 8-pin SO package; lower thermal resistance (471mW @ +70°C vs. 727mW for DIP) | Better suited for space-constrained PCBs requiring surface-mount assembly | Select MAX765ESA+ for automated SMT production; MAX765EPA+ for prototyping, through-hole legacy designs, or higher-power dissipation needs |
| LM2662CMX/NOPB | Charge-pump inverter (no inductor); max -7V output, 100mA current, 170µA quiescent current | Limited to light loads and moderate voltage ranges; unsuitable for >100mA or -12V precision requirements | Choose LM2662CMX/NOPB only for ultra-low-noise, low-current (<50mA), inductor-free designs where -12V accuracy is not critical |
Compared with MAX765ESA+, the MAX765EPA+ offers higher power dissipation margin and easier hand-soldering; compared with LM2662CMX/NOPB, it delivers double the output current, tighter -12V regulation, and superior efficiency above 50mA-making it the preferred choice for medium-power portable instrumentation.
Availability
MAX765EPA+ is available at Aetrix Electronics and suitable for LCD-bias generators, portable instruments, LAN adapters, and remote data-acquisition systems requiring stable component supply, extended temperature operation (-40°C to +85°C), and long-term obsolescence management.
Supply support for MAX765EPA+ 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 to deliver high-efficiency, low-IQ inverting DC-DC conversion for battery-sensitive portable electronics-emphasizing minimal external components, wide input range, and robust thermal behavior.
FAQ
What output voltage does the MAX765EPA+ provide, and is it adjustable?
MAX765EPA+ provides a factory-preset -12V output with ±4% tolerance. It is adjustable from -1V to -16V using two external resistors (R1 = 150kΩ, R2 = 150kΩ × |VOUT|/1.5V) connected between OUT, FB, and REF. Fixed operation requires only tying FB to REF-no resistor calculation needed for nominal -12V use.
What is the maximum input-to-output voltage differential allowed for the MAX765EPA+?
The MAX765EPA+ has an absolute maximum VIN–VOUT differential of 20V. This limit arises from the internal P-MOSFET's LX-to-V+ voltage swing constraints. For example, with V+ = 5V, the most negative allowable VOUT is -15V; with V+ = 16V, VOUT may go as low as -4V. Exceeding this differential risks permanent damage.
Can the MAX765EPA+ operate from a 3.3V input to generate -12V?
Yes, the MAX765EPA+ supports 3V–16V input, including 3.3V. However, at 3.3V input, maximum output current is reduced due to limited headroom-approximately 80mA at -12V per the "Maximum Output Current vs. Supply Voltage" graph. For full 250mA capability, V+ ≥ 5V is recommended.
What inductor value is recommended for the MAX765EPA+, and why is 47µH ideal?
A 47µH surface-mount inductor is recommended for the MAX765EPA+ because its value balances peak current limitation, efficiency, and physical size. At 300kHz switching, 47µH ensures the inductor current ramps within the 0.75A peak limit before the current comparator triggers turn-off-preventing excessive conduction losses while enabling use of <5mm-diameter SMT magnetics.
How does the MAX765EPA+ achieve high efficiency at light loads?
The MAX765EPA+ achieves high light-load efficiency via its current-limited PFM scheme: it initially applies half the peak current limit (0.375A) for the first two switching pulses. If regulation is restored, it remains in low-current mode; if not, it escalates to full 0.75A. This reduces switching losses and core losses at sub-10mA loads-keeping supply current below 120µA across the full load range.
MAX765EPA+ 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 (-12V)
- Voltage - Output (Max):
- -16V
- Current - Output:
- 120mA
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX765EPA+ FAQ
1.How can I place an order for MAX765EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX765EPA+ 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 MAX765EPA+ reliable?
The price and inventory of MAX765EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX765EPA+ is usually 5 days.
3.What payment methods are accepted for MAX765EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX765EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX765EPA+?
MAX765EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX765EPA+ 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 MAX765EPA+?
For technical support, including MAX765EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX765EPA+ requirements.
6.How does Aetrix verify that MAX765EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX765EPA+ 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 MAX765EPA+ meets industry standards.
7.What is the process for return or replacement of MAX765EPA+?
All MAX765EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX765EPA+, 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 MAX765EPA+ part is unused and in its original packaging.
Return procedure for MAX765EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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