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Analog Devices Inc./Maxim Integrated MAX766CSA+
- Part No.:
- MAX766CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX766CSA+.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:110
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Product details
Overview
MAX766CSA+ from Maxim Integrated is a high-efficiency, current-limited PFM inverting DC-DC converter with internal P-channel power MOSFET, delivering up to 250mA at -15V output, 120µA max supply current, and 300kHz switching frequency. It operates from 3V to 16V input and supports fixed -15V or adjustable -1V to -16V output via external resistors - ideal for LCD bias generation in portable instrumentation.
For engineers reviewing the MAX766CSA+ datasheet, MAX766CSA+ pinout, MAX766CSA+ application, or MAX766CSA+ equivalent, key selection criteria include its -15V fixed output capability, ultra-low quiescent current under light load, integrated switch architecture eliminating external FET drive complexity, and compatibility with miniature 47µH surface-mount inductors for space-constrained designs.
Technical Context
The MAX766CSA+ employs a proprietary current-limited pulse-frequency modulation (PFM) control scheme that enforces peak inductor current limiting (0.75A), maximum on-time (16µs), and minimum off-time (2.3µs) to maintain regulation across wide load ranges. Its BiCMOS process integrates a P-channel power MOSFET with low on-resistance (typ. 1.5Ω) and enables operation with only a single inductor, Schottky diode, and three capacitors.
This device powers itself from the differential voltage between V+ and VOUT, maximizing gate drive for the internal switch and improving efficiency - but constrains absolute VIN–VOUT differential to ≤21V. Shutdown mode reduces supply current to <5µA while disabling the reference and discharging OUT to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -15V ±4% (or adjustable -1V to -16V using R1/R2 divider) |
| Max Output Current | 250mA at V+ = 16V; derates to ~150mA at V+ = 5V per graph data |
| Supply Current (no load) | ≤120µA typical; enables battery-powered operation >1000 hours on coin cell |
| Shutdown Current | ≤5µA - critical for low-power sleep modes in remote sensors |
| Input Voltage Range | 3V to 16V - supports single Li-ion, multi-cell alkaline, or regulated 5V/12V rails |
| Switching Frequency | Up to 300kHz - allows use of <5mm diameter SMT inductors (e.g., 47µH) |
| Peak Switch Current | 0.75A - sets minimum inductor saturation rating and diode current handling |
Pinout & Package
MAX766CSA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, body size 4.9mm × 6.0mm × 1.75mm, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 5) | Power and signal reference ground | Must be star-connected to C1/C4 grounds to minimize switching noise coupling into FB/REF |
| V+ (Pins 6,7) | Positive input supply rail | Dual pins reduce trace resistance; requires 0.1µF ceramic bypass capacitor placed adjacent to pins |
| LX (Pin 8) | Drain of internal P-channel MOSFET | Swings from V+ (ON) to |VOUT| + diode drop (OFF); drives 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; used as FB reference for adjustable outputs |
| SHDN (Pin 3) | Active-high TTL/CMOS shutdown control | Pulling high disables regulator and drops IQ to <5µA; connect to GND for normal operation |
| FB (Pin 2) | Feedback input for output voltage regulation | Connected to REF for fixed -15V mode; connected to resistor divider for adjustable output |
| OUT (Pin 1) | Output sense connection | Must be tied directly to VOUT node; provides feedback path for internal error amplifier in fixed-output configuration |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables >80% efficiency from 1mA to 250mA load without external compensation |
| Integrated P-channel MOSFET | Eliminates need for external gate driver and discrete FET - reduces BOM count by ≥4 components |
| Ultra-low quiescent current | 120µA max supply current extends battery life in always-on portable instruments |
| Adjustable output range | -1V to -16V via two-resistor divider - supports custom bias voltages for OLED, TFT, or op-amp dual-rail supplies |
| Miniature magnetics support | 300kHz operation allows 47µH SMT inductors <5mm diameter - saves PCB area vs. 50–100kHz alternatives |
Applications
| LCD Bias Generation | Portable Instrumentation |
|---|---|
Use Scenario: Generating negative bias for TFT-LCD source drivers in handheld medical monitors. IC Role / Device Role / Timing Role: Inverting DC-DC converter providing stable -15V rail from 3.3V or 5V main supply. Use Value: Enables compact, low-noise display power with no external MOSFET or controller IC - reducing layer count and EMI risk. |
Use Scenario: Powering analog front-end circuitry (op-amps, ADCs) requiring dual ±15V rails in battery-operated test equipment. IC Role / Device Role / Timing Role: Primary negative rail generator paired with positive boost converter. Use Value: Delivers 250mA at -15V with <120µA quiescent draw - extends runtime between charges without compromising signal integrity. |
| LAN Adapter Power | Remote Data Acquisition |
Use Scenario: Providing isolated -12V bias for RS-485 transceivers and Ethernet PHY termination in industrial edge nodes. IC Role / Device Role / Timing Role: Standalone inverter supplying clean negative rail independent of system 3.3V/5V domains. Use Value: Achieves >82% efficiency at 100mA load with minimal external components - simplifies compliance testing for conducted emissions. |
Use Scenario: Conditioning sensor signals in solar-powered environmental monitoring stations operating at -40°C to +85°C. IC Role / Device Role / Timing Role: Negative supply source for precision instrumentation amplifiers and reference buffers. Use Value: Maintains regulation over full temperature range with <±10mV output drift - ensures measurement accuracy 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 |
|---|---|---|---|
| MAX776ESA+ | Drives external P-channel MOSFET; supports up to 5W output; requires gate driver and layout isolation | Used where >250mA or >-15V output needed; higher BOM cost and board area | Select MAX776ESA+ only when MAX766CSA+ output current or voltage headroom is insufficient |
| LM2662MX/NOPB | Charge-pump inverter; no inductor required; limited to 100mA at -5V; lower efficiency above 50mA | Suitable for low-current logic-level inversion (e.g., RS-232), not analog bias rails | Choose LM2662MX/NOPB only for ultra-low-noise, inductor-free designs below 100mA |
Compared with MAX776ESA+, MAX766CSA+ offers lower component count and simpler layout but less output power headroom; versus LM2662MX/NOPB, it delivers 2.5× more current with superior regulation and ripple performance at medium loads - making it optimal for precision analog biasing.
Availability
MAX766CSA+ is available at Aetrix Electronics and suitable for LCD bias generation, portable instrumentation, LAN adapter power, and remote data acquisition requiring stable component supply across commercial and extended temperature grades.
Supply support for MAX766CSA+ 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 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 space- and power-constrained portable systems - emphasizing integration, efficiency across load range, and ease of use with standard passive components.
FAQ
What output voltage does the MAX766CSA+ provide?
The MAX766CSA+ provides a factory-preset -15V output with ±4% tolerance. It can also be configured for adjustable output from -1V to -16V using two external resistors connected to the FB and REF pins. The internal 1.5V reference enables precise ratio-based setting per the formula R2 = R1 × (|VOUT| / 1.5V), where R1 is typically 150kΩ. This flexibility makes MAX766CSA+ suitable for custom analog bias requirements beyond standard rails.
Can the MAX766CSA+ operate from a 3.3V input?
Yes, the MAX766CSA+ supports input voltages from 3V to 16V, so 3.3V is within specification. However, at 3.3V input, the maximum achievable -15V output is limited by the 21V absolute maximum V+–VOUT differential - meaning VOUT cannot go below -(3.3V – 0.5V) ≈ -2.8V in practice. For -15V output, minimum recommended V+ is 5V per the "Maximum Output Current vs. Supply Voltage" graph. Thus, MAX766CSA+ requires ≥5V input to deliver full -15V output capability.
What is the shutdown behavior of the MAX766CSA+?
When SHDN is driven high (≥1.6V), the MAX766CSA+ enters shutdown mode, reducing supply current to <5µA, disabling the internal reference, and allowing OUT to discharge to GND through internal circuitry. The device remains in shutdown until SHDN falls below 0.4V. During shutdown, LX is high-impedance and no switching occurs. This behavior enables precise power gating in battery-critical applications - for example, MAX766CSA+ can extend shelf life of remote sensors by cutting leakage during idle periods.
Which inductor value is recommended for the MAX766CSA+?
A 47µH surface-mount inductor is recommended for most MAX766CSA+ applications, as specified in the datasheet and validated in typical operating circuits. Inductors should have ≥0.75A saturation current rating, DC resistance <100mΩ, and ferrite or shielded construction to minimize radiated noise. Examples include Coilcraft D03316-473 or Sumida CD75-470. Lower values (e.g., 22µH) increase ripple and reduce efficiency; higher values (>68µH) offer diminishing returns and may impair transient response - all confirmed in MAX766CSA+ characterization data.
Does the MAX766CSA+ require an external diode?
Yes, the MAX766CSA+ requires an external Schottky diode (e.g., 1N5817 or equivalent) connected between LX and VOUT. This diode provides the return path for inductor current during the switch-off phase and must handle ≥0.75A average forward current and ≥20V reverse voltage. At high temperatures or light loads, high-leakage Schottky diodes may degrade efficiency; in those cases, high-speed silicon diodes like MUR105 are acceptable alternatives - a design choice explicitly validated in the MAX766CSA+ datasheet's Diode Selection section.
MAX766CSA+ 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 (-15V)
- Voltage - Output (Max):
- -16V
- Current - Output:
- 105mA
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX766CSA+ FAQ
1.How can I place an order for MAX766CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX766CSA+ 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 MAX766CSA+ reliable?
The price and inventory of MAX766CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX766CSA+ is usually 5 days.
3.What payment methods are accepted for MAX766CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX766CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX766CSA+?
MAX766CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX766CSA+ 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 MAX766CSA+?
For technical support, including MAX766CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX766CSA+ requirements.
6.How does Aetrix verify that MAX766CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX766CSA+ 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 MAX766CSA+ meets industry standards.
7.What is the process for return or replacement of MAX766CSA+?
All MAX766CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX766CSA+, 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 MAX766CSA+ part is unused and in its original packaging.
Return procedure for MAX766CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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