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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:1,367
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Product details
Overview
The MAX765ESA from Maxim Integrated is a -12V fixed-output, high-efficiency inverting DC-DC switching regulator with internal P-channel MOSFET, 250mA output current capability, 120µA max supply current, and 300kHz switching frequency-designed for battery-powered portable instruments and LCD-bias generation where low quiescent power and compact magnetics are critical.
For engineers reviewing the MAX765ESA datasheet, MAX765ESA pinout, MAX765ESA application, or MAX765ESA equivalent, this page delivers verified technical context, exact pin functions, real-world efficiency behavior across load/temperature, confirmed alternative options for -12V inverting conversion, and supply-chain support for industrial embedded designs.
Technical Context
The MAX765ESA employs a proprietary current-limited pulse-frequency-modulated (PFM) control scheme that enforces 16µs maximum on-time and 2.3µs minimum off-time while dynamically scaling peak current between 0.375A (light-load) and 0.75A (full-load). Its BiCMOS architecture integrates a P-channel power MOSFET with 2.5Ω typical on-resistance and uses the V+–OUT differential to drive the switch gate, maximizing efficiency at high VIN–VOUT differentials.
This device operates in either continuous-conduction mode (CCM) up to 250mA or discontinuous-conduction mode (DCM) at lighter loads, delivering >82% efficiency at 10–100mA with V+ = 5V and VOUT = -12V. The 1.5V reference (REF) supports precise feedback via FB, enabling both fixed-output (-12V) and adjustable operation (-1V to -16V) using external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | -12V fixed (±4% tolerance); adjustable range -1V to -16V via external divider |
| Input Voltage Range | 3V to 16V - supports single-cell Li-ion, dual-cell alkaline, and wide industrial rails |
| Max Output Current | 250mA at V+ = 16V; derates to ~150mA at V+ = 5V per max-output-current vs. VIN curve |
| Supply Current | 120µA max (no load); drops to ≤5µA in shutdown - enables multi-year battery life in standby |
| Switching Frequency | Up to 300kHz - permits use of <5mm surface-mount inductors (e.g., 47µH) |
| Peak Switch Current | 0.75A - sets inductor saturation and diode RMS current requirements |
| Reference Voltage | 1.5V ±30mV - defines FB trip point and enables accurate output setting with R1/R2 |
Pinout & Package
MAX765ESA is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC footprint (5.0mm × 4.0mm, 1.75mm height), RoHS-compliant matte tin lead finish, and thermal pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Sense input for fixed-output mode | Connected directly to VOUT; closes internal voltage divider when FB tied to REF |
| 2: FB | Feedback input | Compares divided output voltage against 1.5V REF; open for fixed mode, resistor-connected for adjustable mode |
| 3: SHDN | Active-high shutdown control | Logic-high (>1.6V) disables switching and reduces supply current to <5µA; TTL/CMOS compatible |
| 4: REF | 1.5V precision reference output | Sources up to 100µA; requires 0.1µF bypass capacitor to GND for stability |
| 5: GND | Analog and power ground | Single-point star grounding required; connects to input/output capacitor grounds |
| 6,7: V+ | Positive power supply input | Dual pins for lower impedance; must be decoupled with 0.1µF ceramic + 120µF bulk capacitor |
| 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 | Enables >82% efficiency from 1mA to 250mA by combining light-load PFM benefits with heavy-load PWM-like regulation |
| Integrated P-channel MOSFET | Eliminates external switch; 2.5Ω typical on-resistance reduces component count and layout complexity |
| Ultra-low quiescent current | 120µA max operating supply current extends battery runtime in always-on portable systems |
| Wide input voltage range | 3V–16V operation supports diverse sources including unregulated wall adapters and aging battery stacks |
| Adjustable output capability | Configurable from -1V to -16V using two resistors - avoids redesign when output voltage changes |
Applications
| LCD-Bias Generators | Portable Instruments |
|---|---|
Use Scenario: Generating negative bias voltage for STN/TN LCD panels in handheld meters and medical monitors. IC Role / Device Role / Timing Role: Inverting DC-DC converter providing stable -12V rail from 3.3V or 5V main supply. Use Value: Enables compact, low-noise panel drive with no external MOSFET or controller IC required. |
Use Scenario: Powering analog front-ends and microcontrollers in battery-operated test equipment. IC Role / Device Role / Timing Role: Primary negative supply generator delivering regulated -12V at up to 250mA. Use Value: Achieves >80% efficiency across 0.1–250mA load range, minimizing heat and extending AA/AAA cell life. |
| LAN Adapters | Remote Data-Acquisition Systems |
Use Scenario: Providing isolated negative voltage for RS-232 transceivers and Ethernet PHY biasing in compact USB-to-LAN dongles. IC Role / Device Role / Timing Role: Compact inverter supplying -12V from 5V USB bus with minimal BOM. Use Value: 300kHz switching allows tiny 47µH inductor; 120µA IQ prevents excessive drain during link-idle states. |
Use Scenario: Powering sensor signal conditioning circuits and ADC references in solar-powered environmental sensors. IC Role / Device Role / Timing Role: Efficient -12V source for op-amp rails and precision DACs in ultra-low-power nodes. Use Value: Shutdown current <5µA enables multi-year deployment without maintenance; wide VIN accommodates variable solar input. |
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 | Drives external P-channel MOSFET; supports up to 5W output; no internal switch | Required for >250mA loads or higher negative voltages beyond -16V | Select MAX775ESA when output current exceeds 250mA or when -12V must be delivered at >500mA with external FET |
| LT1931IS5#TRPBF | Fixed -12V output; 1.25MHz switching; 1.25A switch; 2.7V–10V input range | Narrower input range but smaller solution size due to higher frequency and integrated Schottky | Choose LT1931IS5#TRPBF for space-constrained designs needing sub-2mm² layout and input <10V |
Compared with MAX765ESA, MAX775ESA offers higher power scalability via external FET but adds complexity and BOM cost, while LT1931IS5#TRPBF delivers smaller footprint and faster transient response at the expense of reduced input voltage flexibility and no adjustable output option.
Availability
MAX765ESA is available at Aetrix Electronics and suitable for portable instruments, LCD-bias generators, and remote data-acquisition systems requiring stable component supply across extended temperature ranges (-40°C to +85°C) and long production lifecycles.
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) is a U.S.-based 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 - prioritizing efficiency across wide load ranges without external switches.
FAQ
What is the output voltage configuration of the MAX765ESA?
The MAX765ESA provides a factory-preset -12V output voltage with ±4% tolerance. It can also be configured for adjustable operation from -1V to -16V by connecting an external resistor divider between OUT and FB, using the internal 1.5V reference (REF) as the feedback node. Fixed-mode operation requires tying FB directly to REF.
Does the MAX765ESA require an external MOSFET?
No, the MAX765ESA integrates a P-channel power MOSFET with 2.5Ω typical on-resistance and 0.75A peak current capability. This eliminates the need for an external switch in applications up to 250mA output current and simplifies PCB layout - unlike the MAX775ESA, which requires an external P-FET for higher power.
What is the minimum input voltage required for the MAX765ESA to start up?
The MAX765ESA requires a minimum input voltage of 3.0V to initiate regulation. Startup supply voltage increases slightly with output load - for example, at 250mA output, startup occurs at approximately 3.4V (per Figure MAX764-11). Below 3.0V, the device remains unregulated and cannot sustain output.
How does shutdown mode affect the MAX765ESA's output voltage?
When SHDN is driven high (>1.6V), the MAX765ESA enters shutdown mode: switching ceases, supply current drops below 5µA, the internal reference (REF) is disabled, and the OUT pin discharges to ground through internal circuitry. This ensures safe, low-power state with no residual output voltage.
Can the MAX765ESA operate with a 3.3V input to generate -12V?
Yes, the MAX765ESA supports 3V–16V input, including 3.3V. However, delivering -12V from 3.3V requires |VIN – VOUT| = 15.3V, which is within the 20V max differential rating. Output current capability is reduced - approximately 80mA at 3.3V input (per MAX764-04 graph), sufficient for low-power biasing applications.
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:
- 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:
- -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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