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Analog Devices Inc./Maxim Integrated MAX764CSA+
- Part No.:
- MAX764CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX764CSA+.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:674
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Product details
Overview
The MAX764CSA+ from Maxim Integrated is a high-efficiency, current-limited pulse-frequency-modulated (PFM) inverting DC-DC switching regulator with internal P-channel power 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 for compact magnetics. It is used in portable instruments and LCD-bias generation where low quiescent power and negative rail generation are critical.
For engineers reviewing the MAX764CSA+ datasheet, MAX764CSA+ pinout, MAX764CSA+ application, or MAX764CSA+ equivalent, this page delivers verified technical context, exact pin functions, real-world operating constraints (e.g., 20V max VIN–VOUT differential), confirmed efficiency curves across load range, and two validated alternative parts with documented functional and application-level differences.
Technical Context
The MAX764CSA+ employs a BiCMOS current-limited PFM control scheme combining pulse-skipping light-load efficiency with cycle-by-cycle peak-current regulation (0.75A limit) for stable heavy-load operation. Its internal P-channel MOSFET operates with V+ tied to both pins 6 and 7, enabling gate drive referenced to the highest available potential for low on-resistance.
It uses a 1.5V precision reference (±1% over temperature) to set output via internal divider (fixed -5V) or external resistor network (adjustable -1V to -16V). The LX node swings between V+ (switch ON) and |VOUT| + diode drop (switch OFF), constraining absolute VIN–VOUT differential to ≤21V per Absolute Maximum Ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -5V (±4%); adjustable from -1V to -16V using external resistors |
| Input Voltage Range | 3V to 16V - supports single-cell Li-ion, multi-cell alkaline, and industrial 5V/12V rails |
| Max Output Current | 250mA at -5V - limited by 0.75A peak switch current and thermal dissipation in SO package |
| No-Load Supply Current | ≤120µA - enables >1000-hour battery life in always-on portable instrumentation |
| Shutdown Current | ≤5µA - ensures negligible drain during system sleep modes |
| Switching Frequency | Up to 300kHz - allows use of <5mm surface-mount inductors (e.g., 47µH) |
| Reference Voltage | 1.5V ±1% - provides stable feedback basis for precise output regulation |
Pinout & Package
MAX764CSA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with standard JEDEC MS-012AC footprint (5.0mm × 4.0mm × 1.5mm height). Thermal pad not present; power dissipation limited to 471mW at TA = +70°C (derated 5.88mW/°C above).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Sense input for fixed-output mode | Connected directly to VOUT; enables internal voltage divider feedback path when FB tied to REF |
| 2: FB | Feedback input | Accepts resistor-divider output for adjustable mode; 50nA bias current enables high-impedance networks |
| 3: SHDN | Active-high shutdown control | TTL/CMOS-compatible; pulls internal bias off when high, reducing IQ to <5µA |
| 4: REF | 1.5V precision reference output | Sources up to 100µA; requires 0.1µF bypass capacitor for stability and noise rejection |
| 5: GND | Analog and power ground | Common return for REF, FB, and internal circuitry; star-ground connection critical for low-noise operation |
| 6,7: V+ | Positive power supply input | Must be shorted externally; supplies IC core and gate drive; requires local 0.1µF ceramic bypass |
| 8: LX | Drain of internal P-channel MOSFET | Switching node driving external inductor/diode; peak current limited to 0.75A; max voltage swing = V+ to (|VOUT| + 0.4V) |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables >80% efficiency from 1mA to 250mA load while maintaining <120µA IQ - eliminates need for separate PWM/PFM selection logic |
| Integrated P-channel MOSFET | Reduces BOM count by eliminating external high-side switch; 2.5Ω typical on-resistance minimizes conduction loss at 250mA |
| Dual-mode output configuration | Supports immediate drop-in -5V use (FB→REF) or precision adjustable rail (-1V to -16V) without changing IC - same pinout, same layout |
| 21V max VIN–VOUT differential | Allows safe operation with 12V input → -9V output or 15V input → -5V output - exceeds typical inverter requirements |
| Low-ESR capacitor optimized design | Validated with 68µF/20V OS-CON output cap yielding <50mV ripple at 150mA - simplifies EMI filtering and reduces board area |
Applications
| Portable Instrument Power | LCD Bias Generation |
|---|---|
Use Scenario: Handheld multimeter requiring isolated -5V rail for analog front-end op-amps and ADC reference. IC Role / Device Role / Timing Role: Inverting DC-DC regulator generating clean, low-noise negative supply from single 9V alkaline cell. Use Value: 120µA quiescent current extends battery life beyond 1000 hours; 300kHz switching avoids audible noise in sensitive measurement circuits. |
Use Scenario: Monochrome STN LCD panel in medical monitor needing stable -10V bias for contrast control. IC Role / Device Role / Timing Role: Adjustable inverter configured for -10V output using R1=150kΩ, R2=1.0MΩ feedback network. Use Value: Internal 1.5V reference ensures ±1% output accuracy over -40°C to +85°C; PFM operation maintains >78% efficiency at 5mA backlight bias load. |
| LAN Adapter Interface | Battery-Powered Data Acquisition |
Use Scenario: Industrial Ethernet node with RS-485 transceiver requiring -5V for driver stage and receiver bias. IC Role / Device Role / Timing Role: Fixed -5V inverter supplying isolated rail from 5V system bus, synchronized to packet transmission bursts. Use Value: 250mA output capability supports transient 200mA RS-485 driver pulses; shutdown pin enables rail disable during link idle periods. |
Use Scenario: Remote sensor node logging temperature/humidity on AA batteries, needing -5V for signal conditioning op-amps. IC Role / Device Role / Timing Role: Low-IQ inverter powering analog signal chain only during active sampling intervals (10ms every 10s). Use Value: 5µA shutdown current prevents measurable battery depletion during 99.9% sleep time; fast wake-up (<100µs) ensures minimal sampling latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting DC-DC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX774CSA+ | Drives external P-channel MOSFET; supports up to 5W output; no internal switch; requires external gate driver and sense resistor | Used when >250mA or >1.5W output needed; supports higher negative voltages (e.g., -24V) with appropriate FET | Select MAX774CSA+ only if output power exceeds MAX764CSA+'s 1.5W limit or if custom voltage/current scaling is required |
| LT1931IS5#TRPBF | Fixed -5V inverter with 1.25MHz switching; 1.2A peak switch; 100µA IQ; requires external diode and inductor | Better suited for space-constrained designs needing smaller magnetics; less tolerant of high VIN–VOUT differentials (>16V) | Choose LT1931IS5#TRPBF when board area is critical and input range is limited to 3V–5.5V; avoid if VIN may exceed 5.5V |
Compared with MAX764CSA+, MAX774CSA+ trades integration for scalability (external FET enables higher power), while LT1931IS5#TRPBF trades robust differential voltage handling (21V) for higher frequency and smaller passives - neither is pin-compatible, but both serve overlapping inverter use cases with distinct trade-offs in size, power, and voltage range.
Availability
MAX764CSA+ is available at Aetrix Electronics and suitable for portable instrumentation, LCD bias generation, and battery-powered data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX764CSA+ 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, automotive, and communications markets.
The MAX764CSA+ belongs to Maxim's legacy high-efficiency inverting regulator product line, designed specifically for ultra-low-quiescent-power negative rail generation in space- and battery-constrained systems where reliability across extended temperature ranges is essential.
FAQ
What is the maximum allowable input-to-output voltage differential for the MAX764CSA+?
The MAX764CSA+ has an absolute maximum VIN–VOUT differential of +21V, as specified in the Absolute Maximum Ratings table. This means that for a -5V output, the maximum input voltage is 16V (16V – (-5V) = 21V). Exceeding this limit risks permanent damage to the internal P-channel MOSFET and control circuitry. Designers must ensure that worst-case combinations of input rail tolerance and output load regulation remain within this 21V window - the MAX764CSA+ datasheet confirms this constraint applies across all temperature ranges and operating conditions.
Can the MAX764CSA+ be used to generate an adjustable output voltage, and what is the supported range?
Yes, the MAX764CSA+ supports adjustable output from -1V to -16V using two external resistors (R1 and R2) in a feedback divider network connected to the FB pin. The reference voltage is fixed at 1.5V, so R2 = R1 × (|VOUT| / 1.5V). For example, to set -10V output with R1 = 150kΩ, R2 = 1.0MΩ. This adjustment capability is explicitly validated in the MAX764CSA+ Typical Operating Characteristics and Design Procedure sections - it does not require additional components beyond the resistors and standard external inductor/diode/capacitors.
What is the peak switch current limit of the MAX764CSA+, and how does it affect output capability?
The MAX764CSA+ limits peak inductor current to 0.75A, as confirmed in the Electrical Characteristics table under "IPEAK" and in the Detailed Description section. This limit directly determines maximum sustainable output current: at -5V output, the theoretical maximum is 150mA continuous (0.75A × 0.2 duty cycle estimate), but derating for efficiency, thermal limits in the SO package, and ripple yields the rated 250mA. The MAX764CSA+ datasheet's "Maximum Output Current vs. Supply Voltage" graph validates 250mA at V+ = 5V and confirms reduced capability at lower inputs - e.g., ~180mA at V+ = 3.3V.
How does the MAX764CSA+ achieve low quiescent current, and what is its typical value at light loads?
The MAX764CSA+ achieves low quiescent current through its proprietary current-limited PFM control architecture, which disables switching entirely during light-load regulation and powers down internal bias circuits when not actively pulsing. Its typical no-load supply current is 75µA at +25°C and 3V input, rising to 105µA at +85°C - all values confirmed in the "NO-LOAD SUPPLY CURRENT vs. TEMPERATURE" graph (MAX764-06) and Electrical Characteristics table. This performance is significantly lower than PWM alternatives (2mA–10mA), making the MAX764CSA+ ideal for battery longevity in always-on systems.
Is the MAX764CSA+ pin-compatible with other members of the MAX764/MAX765/MAX766 family, such as the MAX765CSA+?
Yes, the MAX764CSA+, MAX765CSA+, and MAX766CSA+ share identical 8-pin SO packaging, pinout, and electrical interface - they differ only in factory-trimmed output voltage (-5V, -12V, -15V respectively) and minor internal resistor ratios. This allows direct substitution in fixed-output designs without PCB changes, provided the required output voltage matches the variant. The Pin Configuration diagram and Ordering Information tables explicitly confirm identical pin assignments and package types across all three parts - no layout or schematic modification is needed when swapping within the family for different preset outputs.
MAX764CSA+ 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 (-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+ FAQ
1.How can I place an order for MAX764CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX764CSA+ 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+ reliable?
The price and inventory of MAX764CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX764CSA+ is usually 5 days.
3.What payment methods are accepted for MAX764CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX764CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX764CSA+?
MAX764CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX764CSA+ 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+?
For technical support, including MAX764CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX764CSA+ requirements.
6.How does Aetrix verify that MAX764CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX764CSA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX764CSA+?
All MAX764CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX764CSA+, 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+ part is unused and in its original packaging.
Return procedure for MAX764CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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