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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:240
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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 and 3V–16V input range. It integrates a P-channel power MOSFET and operates at up to 300kHz switching frequency for compact magnetics, targeting portable instruments and battery-powered LCD bias generation.
For engineers reviewing the MAX765CSA+ datasheet, MAX765CSA+ pinout, MAX765CSA+ application, or MAX765CSA+ equivalent, key selection criteria include its fixed -12V output, internal switch architecture, shutdown current <5µA, and compatibility with standard 47µH surface-mount inductors in space-constrained designs.
Technical Context
The MAX765CSA+ uses a BiCMOS current-limited pulse-frequency-modulated (PFM) control scheme that enforces a 16µs maximum on-time and 2.3µs minimum off-time, enabling high efficiency across light-to-heavy loads without external compensation. Its internal P-channel MOSFET features 1.4Ω typical on-resistance and 0.75A peak current limit.
Operation relies on differential voltage between V+ and OUT, limiting VIN–VOUT differential to 21V absolute maximum. The 1.5V reference (REF) supports both fixed-output (FB tied to REF) and adjustable-output (external resistor divider) configurations, with FB trip point at 1.5V ±10mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -12V (±4% over temperature and load), enabling direct replacement of dual-supply rails in analog front-ends. |
| Max Output Current | 250mA at V+ = 5V; derates to ~150mA at V+ = 3V per published curves - defines usable load range in low-input applications. |
| Supply Current (No Load) | 120µA max (TYP 90µA), enabling >1000-hour runtime on coin-cell batteries in standby instrumentation. |
| Shutdown Current | 5µA max (TYP 2µA), allowing deep-sleep mode in remote data-acquisition systems with microcontroller-controlled enable. |
| Switching Frequency | Up to 300kHz - permits use of <5mm-diameter SMT inductors (e.g., 47µH) without custom magnetics design. |
| Input Voltage Range | 3V to 16V - supports single-cell Li-ion (4.2V), dual-cell alkaline (3V), and industrial 12V rails without pre-regulation. |
| VIN–VOUT Differential Limit | 21V absolute max - constrains maximum negative output swing when input is 16V (e.g., -5V min output). |
Pinout & Package
MAX765CSA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, 1.75mm body height, and 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 5) | Power and signal reference ground | Must be star-connected to input/output capacitor grounds to minimize switching noise coupling into feedback path. |
| V+ (Pins 6,7) | Positive input supply rail | Dual pins reduce trace resistance; requires 0.1µF ceramic bypass capacitor placed within 2mm of pins. |
| LX (Pin 8) | Drain of internal P-channel MOSFET | Swings from V+ (ON) to |VOUT| + diode drop (OFF); peak current limited to 0.75A - drives external inductor directly. |
| REF (Pin 4) | 1.5V precision reference output | Sources up to 100µA; must be bypassed with 0.1µF capacitor to stabilize feedback loop and suppress noise. |
| SHDN (Pin 3) | Active-high TTL/CMOS shutdown control | Pulling high reduces supply current to <5µA; connect to GND for normal operation - no pull-up required. |
| FB (Pin 2) | Feedback input for output regulation | Tied to REF for fixed -12V mode; connected to external resistor divider for adjustable output (e.g., -1V to -16V). |
| OUT (Pin 1) | Output sense connection | Connected directly to VOUT node; enables accurate sensing of inverted output voltage independent of diode drop. |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Combines 16µs max on-time and 2.3µs min off-time with 0.75A peak current limit - maintains >80% efficiency from 1mA to 250mA load. |
| Integrated P-channel MOSFET | 1.4Ω typical on-resistance eliminates external switch and gate driver - reduces BOM count by ≥3 components vs. controller-based solutions. |
| Ultra-low quiescent current | 120µA max supply current - extends battery life in portable instruments where standby current dominates lifetime energy budget. |
| Adjustable output capability | Supports -1V to -16V via two-resistor divider (R1 = 150kΩ, R2 = 150kΩ × |VOUT|/1.5V) - enables reuse across multiple voltage-rail designs. |
| High-voltage differential operation | 21V max V+–VOUT differential - allows -12V output from 16V input (e.g., automotive 12V systems with transient headroom). |
Applications
| LCD-Bias Generators | Portable Instruments |
|---|---|
Use Scenario: Generating negative bias voltage for STN/TN LCD segment drivers in handheld multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Inverting DC-DC converter providing stable -12V rail from single 3.3V or 5V supply, synchronized to display update cycles. Use Value: Eliminates need for external charge pumps or dual-input supplies, reducing PCB area by >30% and enabling 20mm-thick instrument enclosures. |
Use Scenario: Powering analog front-end circuitry (op-amps, ADC references) in battery-operated gas detectors and environmental sensors. IC Role / Device Role / Timing Role: High-efficiency negative rail generator operating in burst mode during sensor sampling intervals. Use Value: Achieves 85% efficiency at 10mA load, extending AA/AAA battery life to >12 months while maintaining ±0.5% output regulation. |
| LAN Adapters | Remote Data-Acquisition Systems |
Use Scenario: Supplying isolated -12V bias to RS-485 transceivers and line-driver op-amps in industrial Ethernet nodes. IC Role / Device Role / Timing Role: Compact inverter delivering regulated negative rail from 3.3V logic supply, co-located with PHY IC. Use Value: Enables full-duplex RS-485 communication with <50mV ripple, meeting TIA-485-A common-mode noise immunity requirements. |
Use Scenario: Providing negative supply for precision instrumentation amplifiers and sigma-delta ADCs in solar-monitoring RTUs. IC Role / Device Role / Timing Role: Low-noise inverter powering analog signal chain with shutdown controlled by host MCU during sleep cycles. Use Value: Reduces system standby power to <15µW via 5µA shutdown current, supporting 10-year deployment on primary lithium thionyl chloride cells. |
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 uses external P-channel MOSFET drive; supports up to 5W output power. | Required for loads >250mA or outputs more negative than -16V; needs external FET and gate driver layout. | Select MAX775CSA+ only when higher output current (>300mA) or extended voltage range (-24V) is needed - not a drop-in replacement. |
| TPS60403DBVR | Fixed -12V output, 60mA max, 2.5V–5.5V input, 1.2MHz switching, no internal MOSFET - requires external inductor/diode. | Targeted at ultra-low-power, low-current applications (e.g., sensor bias); unsuitable for >100mA loads due to current limit. | Choose TPS60403DBVR only for sub-60mA applications where board space is less constrained and efficiency at light loads is critical. |
Compared with MAX765CSA+, MAX775CSA+ offers higher power capability at the cost of increased component count and layout complexity, while TPS60403DBVR trades output current and input voltage range for higher switching frequency and lower quiescent current in micro-power niches.
Availability
MAX765CSA+ is available at Aetrix Electronics and suitable for LCD-bias generators, portable instruments, and remote data-acquisition systems requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
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) 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 compact, high-efficiency inverting DC-DC conversion in battery-powered and space-constrained systems, emphasizing low IQ, integrated power switches, and minimal external component count.
FAQ
What is the output voltage configuration of the MAX765CSA+?
The MAX765CSA+ provides a factory-preset fixed output voltage of -12V ±4% across temperature and load. This is achieved by internal resistor division; no external components are required for fixed operation. For adjustable output from -1V to -16V, connect FB to an external resistor divider referenced to the 1.5V REF pin - the MAX765CSA+ datasheet specifies R1 = 150kΩ and R2 = 150kΩ × |VOUT|/1.5V.
Can the MAX765CSA+ operate from a 3.3V input supply?
Yes, the MAX765CSA+ supports input voltages from 3V to 16V, making it fully compatible with 3.3V systems. At V+ = 3.3V, the maximum achievable output current is approximately 100mA (per the "Maximum Output Current vs. Supply Voltage" graph), sufficient for low-power LCD bias or op-amp supplies. Efficiency remains above 75% in this condition.
What is the purpose of the OUT pin on the MAX765CSA+?
The OUT pin on the MAX765CSA+ serves as the output voltage sense connection, directly tied to the VOUT node. It enables accurate regulation by feeding back the actual inverted output voltage - independent of Schottky diode forward drop - to the internal error amplifier. This improves load regulation accuracy compared to architectures sensing at the LX node.
How does the MAX765CSA+ achieve high efficiency at light loads?
The MAX765CSA+ achieves high light-load efficiency through its current-limited PFM control: the first two switching pulses use half the peak current limit (0.375A), minimizing energy loss if regulation is restored quickly. If output remains out-of-regulation, subsequent pulses use full 0.75A peak current. This adaptive pulsing reduces average switching losses and maintains >80% efficiency down to 1mA load.
Is the MAX765CSA+ RoHS-compliant and lead-free?
Yes, the MAX765CSA+ is RoHS-compliant and lead-free. The "+" suffix in the part number denotes lead-free packaging per Maxim's standard product marking convention. The SO package uses matte-tin lead finish, and all die attach, mold compound, and assembly materials meet JEDEC J-STD-609 Category 1 requirements.
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:
- 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:
- 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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