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Analog Devices Inc./Maxim Integrated MAX765ESA+
- Part No.:
- MAX765ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX765ESA+.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,950
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Product details
Overview
MAX765ESA+ from Maxim Integrated is a high-efficiency, current-limited PFM inverting DC-DC converter delivering -12V output at up to 250mA, with 120µA max supply current, 3V–16V input range, and internal P-channel MOSFET. It targets low-power portable instrumentation and battery-powered systems requiring stable negative bias rails.
For engineers reviewing the MAX765ESA+ datasheet, MAX765ESA+ pinout, MAX765ESA+ application, or MAX765ESA+ equivalent, key selection criteria include fixed -12V output, shutdown current ≤5µA, 300kHz switching frequency, LX peak current limit of 0.75A, and SO-8 package compatibility with surface-mount magnetics.
Technical Context
The MAX765ESA+ employs a proprietary current-limited pulse-frequency modulation (PFM) control scheme that enforces a 16µs maximum on-time and 2.3µs minimum off-time, enabling high efficiency across light-to-heavy loads. Its BiCMOS architecture integrates a P-channel power MOSFET with 1.4Ω typical on-resistance and supports operation with miniature 47µH inductors.
It operates from a differential voltage between V+ and OUT, limiting VIN–VOUT to ≤20V absolute. The 1.5V reference (REF) feeds an error comparator via FB, while OUT senses output voltage for fixed-mode regulation - all coordinated without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -12V (±4% over temperature and load) |
| Max Output Current | 250mA at V+ = 16V; derates to ~150mA at V+ = 5V per datasheet graph |
| Input Voltage Range | 3V to 16V - supports single-cell Li-ion up to 4S battery inputs |
| Supply Current (No Load) | ≤120µA typical - enables multi-year battery life in standby instrumentation |
| Shutdown Current | ≤5µA - ensures negligible drain during system sleep modes |
| Switching Frequency | Up to 300kHz - allows use of <5mm-diameter SMT inductors (e.g., 47µH) |
| LX Peak Current Limit | 0.75A - sets maximum inductor energy transfer and defines continuous conduction boundary |
Pinout & Package
MAX765ESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with standard 1.27mm pitch and exposed pad not present. Pin functions are validated per Maxim's official pin description table and top-view diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Sense input for fixed-output mode | Connected directly to VOUT; enables internal feedback divider (REF→FB path) for -12V regulation |
| 2: FB | Feedback input | Shorted to REF for fixed -12V; accepts external resistor divider for adjustable outputs (-1V to -16V) |
| 3: SHDN | Active-high shutdown control | TTL/CMOS-compatible; drives IC into <5µA shutdown when pulled ≥1.6V |
| 4: REF | 1.5V precision reference output | Sources up to 100µA; requires 0.1µF bypass capacitor to GND for stability |
| 5: GND | Power and signal ground reference | Star-ground connection point for C1, C4, and LX return path; critical for noise control |
| 6,7: V+ | Positive supply input (dual pins) | Must be tied together; requires local 0.1µF ceramic bypass capacitor placed adjacent to pins |
| 8: LX | Drain of internal P-channel MOSFET | Swings from V+ (ON) to |VOUT| + diode drop (OFF); peak current limited to 0.75A |
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 0.1mA to 250mA load |
| Integrated P-channel MOSFET | Eliminates external switch; 1.4Ω typical RDS(ON) reduces conduction loss and component count |
| Ultra-low quiescent current | 120µA max supply current enables direct integration into always-on sensor nodes |
| Miniature magnetics support | 300kHz operation allows 47µH, <5mm SMT inductors - no custom magnetics design required |
| Adjustable output capability | Configurable from -1V to -16V using two external resistors (R1 = 150kΩ, R2 = 150kΩ × |VOUT|/1.5V) |
Applications
| LCD Bias Generation | Portable Instrumentation |
|---|---|
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 independent of main system supply. Use Value: Enables compact, battery-operated displays with consistent contrast across 3V–16V input range and <5µA shutdown leakage. |
Use Scenario: Powering analog front-end circuitry (op-amps, ADC references) in portable multimeters and data loggers. IC Role / Device Role / Timing Role: High-efficiency negative supply generator with minimal load-dependent ripple. Use Value: Delivers clean -12V at 250mA with <120µA quiescent draw - extends alkaline/Li-ion battery life by months in intermittent-use devices. |
| LAN Adapter Power | Remote Data Acquisition |
Use Scenario: Providing isolated -12V for RS-232 transceivers or Ethernet PHY bias in industrial LAN interface cards. IC Role / Device Role / Timing Role: Compact inverter supplying dedicated negative rail for level-shifting and driver stages. Use Value: SO-8 footprint and 300kHz switching minimize EMI near sensitive communication lines while supporting wide-input industrial supplies. |
Use Scenario: Supplying sensor signal conditioning circuitry (e.g., strain gauge bridges, thermocouple amps) in solar-powered remote telemetry nodes. IC Role / Device Role / Timing Role: Low-IQ inverter maintaining -12V rail during long sleep cycles between wake-up bursts. Use Value: ≤5µA shutdown current prevents battery depletion during multi-week idle periods; fast start-up (<1ms) enables responsive wake-up. |
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 |
|---|---|---|---|
| MAX775ESA+ | Same -12V fixed output, but uses external P-channel MOSFET; supports up to 5W output power | Required for >250mA loads or higher output voltages beyond -16V | Select MAX775ESA+ only when output current exceeds 250mA or when thermal constraints favor external FET dissipation |
| LM2662MX/NOPB | Charge-pump inverter (no inductor); delivers only -5.2V typical at 100mA; 170µA quiescent current | Lower cost, smaller footprint, but limited to light loads and lower voltage magnitude | Choose LM2662MX/NOPB for space-constrained, low-current (<100mA), low-noise applications where inductor-free design is mandatory |
Compared with MAX765ESA+, MAX775ESA+ offers higher power capability at the cost of added components and layout complexity, while LM2662MX/NOPB trades output voltage range and current for simplicity and size - making MAX765ESA+ optimal for medium-current, fixed -12V inductive inversion with minimal BOM.
Availability
MAX765ESA+ is available at Aetrix Electronics and suitable for portable instrumentation, remote data acquisition systems, and LCD-bias generation requiring stable component supply, extended temperature operation (-40°C to +85°C), and long-term industrial lifecycle support.
Supply support for MAX765ESA+ 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 industrial, medical, and communications 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 external compensation.
FAQ
What is the exact output voltage tolerance of the MAX765ESA+ under full load and temperature?
The MAX765ESA+ delivers -12V with ±4% tolerance across its full operating temperature range (-40°C to +85°C) and load range (0–250mA), as specified in the Electrical Characteristics table under "MAX765C/E, -11.52V ≤ VOUT ≤ -12.48V" condition. This tolerance holds with 3V–16V input and proper 0.1µF REF bypassing.
Can the MAX765ESA+ be used in adjustable-output mode, and what resistor values set -12V?
Yes, the MAX765ESA+ supports adjustable output from -1V to -16V using external resistors R1 and R2. For -12V, with VREF = 1.5V and R1 = 150kΩ (recommended), R2 = 150kΩ × |−12V| / 1.5V = 1.2MΩ. The FB pin connects to the R1–R2 junction, and REF connects to the R1–GND node.
What is the maximum allowable voltage difference between V+ and OUT for the MAX765ESA+?
The MAX765ESA+ specifies a maximum differential voltage of 20V between V+ and OUT (absolute maximum rating: +21V). Exceeding this risks permanent damage. For example, at V+ = 16V, VOUT must remain ≥ -4V (i.e., |VOUT| ≤ 4V); at V+ = 5V, VOUT may go as low as -15V - confirming its suitability for -12V operation across the full 3V–16V input range.
Does the MAX765ESA+ require an external Schottky diode, and what is the recommended part?
Yes, the MAX765ESA+ requires an external Schottky diode in its inverting buck-boost topology. The 1N5817 is explicitly recommended in the datasheet for ≤0.75A average current, low forward voltage, and high-speed recovery. At elevated temperatures or light loads, alternatives like MUR105 (high-speed silicon) may reduce leakage-related inefficiency.
How does the MAX765ESA+ achieve high efficiency at light loads compared to PWM inverters?
The MAX765ESA+ achieves high light-load efficiency via its current-limited PFM scheme: it pulses only when regulation is lost, drawing just 120µA typical no-load supply current - versus 2mA–10mA for comparable PWM devices. Its dual one-shot timing (16µs on / 2.3µs off) and half-current startup further minimize idle power without sacrificing heavy-load performance.
MAX765ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX765ESA+ FAQ
1.How can I place an order for MAX765ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX765ESA+ 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 MAX765ESA+ reliable?
The price and inventory of MAX765ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX765ESA+ is usually 5 days.
3.What payment methods are accepted for MAX765ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX765ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX765ESA+?
MAX765ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX765ESA+ 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 MAX765ESA+?
For technical support, including MAX765ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX765ESA+ requirements.
6.How does Aetrix verify that MAX765ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX765ESA+ 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 MAX765ESA+ meets industry standards.
7.What is the process for return or replacement of MAX765ESA+?
All MAX765ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX765ESA+, 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 MAX765ESA+ part is unused and in its original packaging.
Return procedure for MAX765ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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