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Analog Devices Inc./Maxim Integrated MAX764CSA+T
- Part No.:
- MAX764CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX764CSA+T.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,764
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Product details
Overview
The MAX764CSA+T from Maxim Integrated is a high-efficiency, current-limited PFM inverting DC-DC converter with internal P-channel MOSFET, delivering up to 250mA at -5V output from a 3V–16V input. It features 120µA max no-load supply current, 5µA max shutdown current, and 300kHz switching frequency-enabling compact designs using <5mm surface-mount magnetics for portable instruments and LCD-bias generation.
For engineers reviewing the MAX764CSA+T datasheet, MAX764CSA+T pinout, MAX764CSA+T application, or MAX764CSA+T equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across temperature ranges, and real-world design implications for battery-powered and space-constrained systems.
Technical Context
The MAX764CSA+T operates as an inverting switching regulator using a proprietary current-limited pulse-frequency modulation (PFM) control scheme that combines ultra-low quiescent current (<120µA) with high full-load efficiency (>82% at 100mA). Its BiCMOS architecture integrates a 0.75A peak-current-rated P-channel power MOSFET on die, eliminating external switch requirements.
It regulates output by sensing feedback voltage at FB relative to the 1.5V internal reference (REF), supports fixed -5V output or adjustable -1V to -16V via resistor divider, and enforces strict timing limits: max on-time = 16µs, min off-time = 2.3µs-ensuring stable operation across 0°C to +70°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | -5V fixed (preset); adjustable from -1V to -16V using external resistors-enables single-part flexibility across multiple bias rails. |
| Input Voltage Range | 3V to 16V-supports single-cell Li-ion (3.0–4.2V), dual-cell alkaline (3–3.2V), and industrial 12V rails without pre-regulation. |
| Max Output Current | 250mA at V+ = 16V; derates to ~150mA at V+ = 5V-dictates minimum inductor saturation rating (≥0.75A) and thermal layout. |
| Supply Current (No Load) | ≤120µA typical at +25°C-enables >1-year battery life in low-duty-cycle remote sensors powered from 2×AA cells. |
| Shutdown Current | ≤5µA maximum-reduces standby drain to negligible levels in always-on portable instrumentation. |
| Switching Frequency | Up to 300kHz-permits use of standard 47µH SMT inductors <5mm diameter, avoiding custom magnetics and reducing board area. |
| Reference Voltage | 1.500V ±30mV (±2%)-sets precision of adjustable output; requires low-ESR REF bypass capacitor (0.1µF) for stability. |
Pinout & Package
MAX764CSA+T uses an 8-pin SO (Small Outline) package with exposed pad (SOIC-8), footprint compatible with industry-standard 150mil-wide SOIC-8 land patterns. Thermal performance optimized for PCB copper pour under exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 5) | Power and signal reference ground | Mandatory star-ground connection point; ties all bypass capacitors (C1, C2, C3, C4) and minimizes noise coupling into FB/REF paths. |
| V+ (Pins 6,7) | Positive input supply rail | Dual-pin configuration reduces trace resistance and IR drop; requires 0.1µF ceramic bypass capacitor placed <2mm from 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-determines inductor saturation margin. |
| REF (Pin 4) | 1.5V precision reference output | Sources up to 100µA; must be bypassed with 0.1µF capacitor to suppress noise affecting FB regulation accuracy. |
| SHDN (Pin 3) | Active-high TTL/CMOS shutdown control | Pulling high disables switching and drops supply current to ≤5µA; connect to GND for normal operation. |
| FB (Pin 2) | Feedback input for output voltage sensing | Connected to REF for fixed -5V mode; for adjustable mode, forms voltage divider with R1/R2-requires shortest possible trace. |
| OUT (Pin 1) | Output sense node for fixed-output configuration | Tied directly to VOUT in fixed-mode circuits; not used in adjustable mode-must remain unconnected if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables >80% efficiency from 1mA to 250mA load while maintaining <120µA quiescent current-ideal for variable-duty-cycle battery systems. |
| Integrated P-channel MOSFET | Eliminates external switch, gate driver, and associated components-reduces BOM count by ≥4 parts and simplifies layout. |
| Adjustable output range | Supports -1V to -16V via two-resistor divider (R1=150kΩ, R2 calculated per VOUT)-replaces three discrete fixed-output variants with one SKU. |
| Low-noise 1.5V reference | Stable ±2% over -40°C to +85°C; enables accurate feedback without external reference-critical for precision analog biasing. |
| Thermally robust SO package | SOIC-8 with exposed pad achieves 5.88mW/°C derating above +70°C-supports continuous 250mA operation with minimal heatsinking. |
Applications
| LCD Bias Generation | Portable Instrumentation |
|---|---|
|
Use Scenario: Generating negative bias voltage for STN/TN LCD panels requiring -5V to -15V at <100mA in handheld multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Inverting DC-DC converter providing regulated negative rail; operates in discontinuous conduction mode at light loads to minimize ripple. Use Value: Replaces bulky charge-pump ICs or transformer-based supplies-cuts solution size by 60% and eliminates magnetic EMI concerns. |
Use Scenario: Powering analog front-end circuitry (op-amps, ADCs, sensors) in battery-operated field test equipment with tight thermal constraints. IC Role / Device Role / Timing Role: Primary negative supply generator; leverages 5µA shutdown current to extend shelf life during storage and transport. Use Value: Enables >2-year battery life on 2×AA cells at 10µA average system current-validated by no-load supply current ≤120µA across 0°C–70°C. |
| LAN Adapter Power | Remote Data-Acquisition Systems |
|
Use Scenario: Providing isolated -5V bias for RS-485 transceivers and Ethernet PHY interface circuitry in industrial LAN adapters. IC Role / Device Role / Timing Role: Compact, efficient inverter supplying clean negative rail; uses 300kHz switching to avoid interference with 10/100Mbps data signals. Use Value: Achieves <50mVpp output ripple with 68µF OS-CON capacitor-meets EMC requirements for Class B digital equipment without added filtering. |
Use Scenario: Powering sensor nodes deployed in unattended locations (e.g., environmental monitoring) where maintenance is infrequent. IC Role / Device Role / Timing Role: Core power conversion element in energy-harvesting or long-life battery systems; supports wide VIN (3–16V) to accommodate aging primary cells. Use Value: Maintains regulation down to 3.0V input-extends usable battery voltage range by 0.5V compared to competing PFM inverters. |
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 |
|---|---|---|---|
| MAX774CSA+ | Drives external P-channel MOSFET; supports up to 5W output; higher IQ (250µA); requires external FET and gate drive components. | Used when >250mA or >-16V output required-e.g., high-current LCD backlight bias or multi-rail industrial sensors. | Select MAX774CSA+ only if MAX764CSA+T's 250mA limit is exceeded; adds complexity but enables scalable power delivery. |
| TPS60403DBVR | Charge-pump inverter; no inductor; fixed -5V output; 60mA max; IQ = 90µA; lower EMI but limited current and efficiency at >20mA. | Suitable for ultra-low-power logic bias (e.g., microcontroller I/O level shifting) where size trumps current capability. | Choose TPS60403DBVR only for sub-60mA loads and space-critical layouts-cannot replace MAX764CSA+T in 100–250mA applications. |
Compared with MAX774CSA+, MAX764CSA+T offers lower component count and simpler layout for ≤250mA needs; versus TPS60403DBVR, it delivers 4× more output current and superior efficiency above 20mA-making it optimal for mid-power portable analog systems.
Availability
MAX764CSA+T is available at Aetrix Electronics and suitable for LCD-bias generation, portable instrumentation, LAN adapter power, and remote data-acquisition systems requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX764CSA+T 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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX764CSA+T belongs to Maxim's legacy high-efficiency DC-DC inverter family, designed specifically for space-constrained, battery-powered applications needing reliable negative voltage generation with minimal external components.
FAQ
What is the maximum output current capability of the MAX764CSA+T?
The MAX764CSA+T delivers up to 250mA at V+ = 16V and -5V output, derating to approximately 150mA at V+ = 5V. This is determined by the internal 0.75A peak current limit and thermal limits of the SOIC-8 package. The MAX764CSA+T datasheet specifies these values in the "Maximum Output Current vs. Supply Voltage" graph (Figure MAX764-04), confirming operational capability across its full input range.
Can the MAX764CSA+T generate output voltages other than -5V?
Yes-the MAX764CSA+T supports adjustable output from -1V to -16V using two external resistors (R1 = 150kΩ, R2 calculated per VOUT = -1.5 × (1 + R2/R1)). For fixed -5V operation, tie FB to REF. This dual-mode capability is explicitly defined in the "Setting the Output Voltage" section of the MAX764CSA+T datasheet and validated across temperature.
What is the shutdown current specification for the MAX764CSA+T?
The MAX764CSA+T draws ≤5µA maximum shutdown current when SHDN is pulled high, as specified in the Electrical Characteristics table (ISHDN parameter, MAX76_C/E/M columns). This value is tested across the full operating temperature range and enables multi-year battery life in always-off standby modes-verified in the "Shutdown Current vs. Temperature" plot (Figure MAX764-07).
Which inductor value is recommended for the MAX764CSA+T in most applications?
A 47µH surface-mount inductor is ideal for most MAX764CSA+T applications, as stated in the General Description and Design Procedure sections. It balances size, efficiency, and transient response-supporting both continuous and discontinuous conduction modes. Inductor saturation current must exceed 0.75A, and DC resistance should be <100mΩ for optimal efficiency per the MAX764CSA+T application guidance.
Does the MAX764CSA+T require an external Schottky diode, and what are the key selection criteria?
Yes-the MAX764CSA+T requires an external Schottky diode (e.g., 1N5817 or 1N5818) rated for ≥0.75A average current. Key criteria include low forward voltage (<0.45V at 250mA) to minimize conduction loss, and low leakage (<100µA at 85°C) to preserve light-load efficiency. High-speed silicon diodes (e.g., MUR105) are acceptable alternatives at elevated temperatures where Schottky leakage becomes problematic.
MAX764CSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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 (-5V)
- Voltage - Output (Max):
- -16V
- Current - Output:
- 260mA
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX764CSA+T FAQ
1.How can I place an order for MAX764CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX764CSA+T 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 MAX764CSA+T reliable?
The price and inventory of MAX764CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX764CSA+T is usually 5 days.
3.What payment methods are accepted for MAX764CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX764CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX764CSA+T?
MAX764CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX764CSA+T 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 MAX764CSA+T?
For technical support, including MAX764CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX764CSA+T requirements.
6.How does Aetrix verify that MAX764CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX764CSA+T 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 MAX764CSA+T meets industry standards.
7.What is the process for return or replacement of MAX764CSA+T?
All MAX764CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX764CSA+T, 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 MAX764CSA+T part is unused and in its original packaging.
Return procedure for MAX764CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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