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Analog Devices Inc./Maxim Integrated MAX765CSA
- Part No.:
- MAX765CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX765CSA.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,662
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Product details
Overview
MAX765CSA 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 space-constrained, battery-powered systems requiring stable negative bias with ultra-low quiescent power.
For engineers reviewing the MAX765CSA datasheet, MAX765CSA pinout, MAX765CSA application, or MAX765CSA equivalent, key selection criteria include its fixed -12V output, shutdown current <5µA, 300kHz switching frequency enabling <5mm magnetics, and compatibility with standard 47µH inductors and Schottky diodes like 1N5817.
Technical Context
The MAX765CSA employs a proprietary current-limited pulse-frequency modulation (PFM) control scheme that enforces a 16µs maximum on-time and 2.3µs minimum off-time, while dynamically scaling peak inductor current between 0.375A (light load) and 0.75A (heavy load). This enables >80% efficiency across 0.1–250mA loads without external compensation.
It operates as a self-biased inverter: V+ and OUT form the total supply rail, applying full differential voltage to the gate of the internal P-MOSFET for low RDS(on); LX swings from V+ to |VOUT| + diode drop, limiting absolute VIN–VOUT differential to 21V. The 1.5V REF pin sources up to 100µA and is used directly for fixed-output operation via FB-to-REF connection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -12V (±4% over temp/load); no external resistor required for nominal operation. |
| Max Output Current | 250mA at V+ = 5V; derates to ~150mA at V+ = 3V per datasheet graph. |
| Supply Current (No Load) | ≤120µA typical; enables multi-year battery life in always-on portable instruments. |
| Shutdown Current | ≤5µA max; reduces system standby power to negligible levels. |
| Switching Frequency | Up to 300kHz; allows use of compact 47µH surface-mount inductors <5mm diameter. |
| Input Voltage Range | 3V to 16V; supports single-cell Li-ion (4.2V), dual-cell alkaline (3V), and industrial 12V rails. |
| Peak Switch Current | 0.75A internal limit; defines inductor saturation margin and diode RMS rating. |
Pinout & Package
MAX765CSA is housed in an 8-pin SO (Small Outline) package with exposed pad thermal enhancement (SOIC-8 narrow body, 150mil width). Pin 1 is OUT; pins 6 and 7 are tied V+ inputs; GND is pin 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Inverting output node | Connects to cathode of flyback diode; delivers regulated -12V; must be referenced to GND for feedback loop. |
| V+ (Pins 6,7) | Positive supply input | Dual pins reduce trace resistance; requires 0.1µF ceramic bypass capacitor placed adjacent to both pins and GND. |
| GND (Pin 5) | Power and signal reference | Star-ground point for C1, C4, and C3; critical for noise suppression in high-di/dt switching paths. |
| FB (Pin 2) | Feedback input | Internally connected to REF for fixed -12V mode; externally biased for adjustable outputs from -1V to -16V. |
| SHDN (Pin 3) | Active-high enable | TTL/CMOS-compatible; pull to GND for normal operation; drives <5µA shutdown current when high. |
| REF (Pin 4) | 1.5V precision reference | Sources up to 100µA; bypassed with 0.1µF capacitor; sets output via resistive divider in adjustable mode. |
| LX (Pin 8) | Switch node | Drain of internal P-MOSFET; connects to inductor and diode anode; swing range = V+ to |VOUT| + 0.4V. |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables >80% efficiency from 0.1mA to 250mA by dynamically scaling peak switch current and enforcing min/max timing constraints. |
| Internal P-channel MOSFET | Eliminates external high-side switch; reduces BOM count and layout complexity for -12V generation in compact PCBs. |
| Ultra-low quiescent current | 120µA max supply current ensures minimal battery drain during active operation-critical for remote data-acquisition systems. |
| Fixed -12V output | No external resistors needed; simplifies design for LCD bias and analog sensor interfaces requiring stable negative rail. |
| 300kHz switching frequency | Permits use of miniature 47µH SMT inductors (e.g., Sumida CD75 series), reducing board area vs. 50–100kHz alternatives. |
Applications
| LCD-Bias Generators | Portable Instruments |
|---|---|
Use Scenario: Generating stable -12V bias for STN/TN LCD contrast control in handheld meters and medical monitors. IC Role / Device Role / Timing Role: Inverting DC-DC converter providing regulated negative rail independent of main system supply. Use Value: Enables crisp display contrast across battery discharge (3V–4.2V), with shutdown current <5µA extending runtime between charges. |
Use Scenario: Powering op-amp front-ends and ADC references in battery-operated multimeters and environmental sensors. IC Role / Device Role / Timing Role: Low-noise negative supply generator supporting rail-to-rail analog signal conditioning. Use Value: 120µA quiescent current preserves battery life; fixed -12V eliminates calibration drift from resistor tolerance in adjustable solutions. |
| LAN Adapters | Remote Data-Acquisition Systems |
Use Scenario: Providing isolated -12V for RS-232 transceivers and Ethernet PHY bias in compact USB-to-LAN dongles. IC Role / Device Role / Timing Role: Compact, efficient inverter meeting EMI limits via 300kHz fixed-frequency operation and minimized loop area. Use Value: SO-8 footprint fits tight adapter PCBs; internal MOSFET avoids layout-sensitive external FET routing near high-speed digital lines. |
Use Scenario: Supplying -12V to instrumentation amplifiers and multiplexers in solar-powered telemetry nodes deployed in field locations. IC Role / Device Role / Timing Role: Primary negative rail source operating across -40°C to +85°C industrial temperature range. Use Value: Guaranteed -12V ±4% output stability over full temp range ensures consistent sensor offset correction without recalibration. |
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 |
|---|---|---|---|
| MAX775CSA | Same pinout, -12V fixed output, but drives external P-MOSFET; supports up to 5W output power. | Required for loads >250mA or where higher efficiency at >100mA is critical; needs external FET and gate drive layout. | Select MAX775CSA only when output current exceeds 250mA or when thermal constraints prevent internal FET operation. |
| LM2662MX/NOPB | Charge-pump inverter; no inductor required; max -10V @ 100mA; 170µA quiescent current; 10kHz switching. | Lower cost and size for light loads (<100mA); unsuitable for high-current or low-ripple applications due to charge-pump topology. | Choose LM2662MX/NOPB for ultra-low-cost, low-power LCD bias where ripple <100mV and current <100mA suffice. |
Compared with MAX765CSA, MAX775CSA offers higher power capability at the cost of added components and layout complexity, while LM2662MX/NOPB trades efficiency and output current for simplicity and cost in low-demand applications.
Availability
MAX765CSA is available at Aetrix Electronics and suitable for LCD-bias generators, portable instruments, LAN adapters, and remote data-acquisition systems requiring stable component supply with guaranteed long-term availability.
Supply support for MAX765CSA 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 ultra-low-quiescent-current inverting DC-DC conversion in battery-critical portable and remote systems, emphasizing minimal external components and wide input-voltage tolerance.
FAQ
What is the output voltage of the MAX765CSA?
The MAX765CSA provides a fixed -12V output voltage with ±4% regulation over temperature, line, and load conditions. This is achieved internally without external resistors-FB is connected to REF in standard configuration. The MAX765CSA datasheet confirms this value across the full operating range of 3V to 16V input and 0–250mA load.
Does the MAX765CSA require an external MOSFET?
No, the MAX765CSA integrates a P-channel power MOSFET and does not require an external switch. Its LX pin connects directly to the inductor and flyback diode. For higher output power (>250mA) or voltages beyond -16V, Maxim recommends the MAX775CSA, which drives an external P-MOSFET-making the MAX765CSA ideal for minimal-component-count -12V generation.
What is the shutdown current specification for the MAX765CSA?
The MAX765CSA draws ≤5µA maximum shutdown current when the SHDN pin is driven high. This ultra-low leakage enables multi-year battery life in always-on remote sensors. The MAX765CSA datasheet specifies this value under V+ = 16V and TA = -40°C to +85°C, confirming robust performance across industrial temperature ranges.
Can the MAX765CSA be used with a 3V input supply?
Yes, the MAX765CSA supports input voltages from 3V to 16V. At 3V input, it delivers -12V output with reduced maximum load current (~150mA), as shown in the "Maximum Output Current vs. Supply Voltage" graph in the MAX765CSA datasheet. This makes it suitable for single-cell alkaline or lithium primary battery systems.
What inductor value is recommended for the MAX765CSA?
A 47µH inductor is recommended for most MAX765CSA applications, as specified in the MAX765CSA datasheet's Design Procedure section. It balances size, efficiency, and ripple-compatible with miniature surface-mount types (e.g., Sumida CD75 series) due to the device's 300kHz switching frequency. Inductor saturation current must exceed 0.75A peak.
MAX765CSA 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX765CSA FAQ
1.How can I place an order for MAX765CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX765CSA 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 MAX765CSA reliable?
The price and inventory of MAX765CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX765CSA is usually 5 days.
3.What payment methods are accepted for MAX765CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX765CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX765CSA?
MAX765CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX765CSA 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 MAX765CSA?
For technical support, including MAX765CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX765CSA requirements.
6.How does Aetrix verify that MAX765CSA is sourced from the original manufacturer or authorized distributors?
All MAX765CSA 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 MAX765CSA meets industry standards.
7.What is the process for return or replacement of MAX765CSA?
All MAX765CSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX765CSA, 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 MAX765CSA part is unused and in its original packaging.
Return procedure for MAX765CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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