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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:1,101
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Product details
Overview
MAX764CSA 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, operating from 3V to 16V input, and consuming only 120µA no-load supply current. It targets space-constrained, battery-powered systems requiring stable negative bias rails.
For engineers reviewing the MAX764CSA datasheet, MAX764CSA pinout, MAX764CSA application, or MAX764CSA equivalent, key selection criteria include its fixed -5V output, 300kHz switching frequency enabling <5mm SMT magnetics, ultra-low quiescent current, shutdown capability (<5µA), and compatibility with standard 47µH inductors and Schottky diodes.
Technical Context
The MAX764CSA uses a proprietary current-limited pulse-frequency-modulated (PFM) control scheme that enforces a 16µs maximum on-time and 2.3µs minimum off-time, while dynamically adjusting peak 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 an inverting regulator powered by the differential voltage between V+ and OUT, applying full gate drive to its internal P-channel MOSFET to minimize on-resistance (typ. 1.9Ω). The 1.5V reference (REF) supports both fixed-output (FB tied to REF) and adjustable-output (-1V to -16V) configurations via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -5V ±4%; supports adjustable mode from -1V to -16V using external resistors |
| Input Voltage Range | 3V to 16V; absolute max V+–OUT differential = 21V |
| Max Output Current | 250mA at V+ = 16V; derates to ~150mA at V+ = 5V per graph data |
| No-Load Supply Current | Typ. 90µA at +25°C; max 120µA over full temperature range |
| Shutdown Current | Max 5µA when SHDN = V+; TTL/CMOS-compatible active-high control |
| Switching Frequency | Up to 300kHz; enables use of miniature surface-mount inductors ≤5mm diameter |
| Internal Switch | P-channel MOSFET with typ. 1.9Ω on-resistance and 0.75A peak current limit |
Pinout & Package
MAX764CSA is housed in an 8-pin SO (Small Outline) package, pin-compatible with the 8-pin plastic DIP variant (MAX764CPA) and suitable for automated SMT assembly. Thermal performance supports 471mW continuous power dissipation at +70°C ambient (derating 5.88mW/°C above).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 5) | Ground reference | Common return path for all internal circuits and external bypass capacitors; must be star-connected to minimize noise |
| V+ (Pins 6,7) | Positive supply input | Dual-pin connection for low-impedance input; requires 0.1µF ceramic capacitor placed adjacent to pins |
| LX (Pin 8) | Switch node | Drain of internal P-MOSFET; swings from V+ (ON) to |VOUT| + diode drop (OFF); peak current limited to 0.75A |
| REF (Pin 4) | 1.5V precision reference output | Sources up to 100µA; bypassed with 0.1µF capacitor; used as feedback reference for adjustable outputs |
| SHDN (Pin 3) | Active-high shutdown control | Logic-level input; pulls internal bias off when high, reducing supply current to <5µA; connect to GND for normal operation |
| FB (Pin 2) | Feedback input | Compares divided output voltage against REF; tie directly to REF for fixed -5V operation |
| OUT (Pin 1) | Output sense | Connects to negative output rail; provides sensing path for internal error amplifier in fixed-output mode |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables >80% efficiency from 0.1mA to 250mA load while maintaining 120µA quiescent current |
| Integrated P-channel MOSFET | Eliminates need for external switch; reduces BOM count and layout complexity for -5V bias generation |
| 300kHz switching frequency | Permits use of compact 47µH SMT inductors (e.g., Sumida CD75 series) without custom magnetics design |
| Dual-mode output configuration | Supports factory-preset -5V output or user-adjustable -1V to -16V via two external resistors (R1=150kΩ, R2 calculated) |
| Low-noise 1.5V reference | Stable ±0.5% over temperature; supplies external circuitry and enables accurate feedback division |
Applications
| LCD-Bias Generators | Portable Instruments |
|---|---|
Use Scenario: Generating stable -5V bias for LCD segment drivers in handheld test meters and portable oscilloscopes. IC Role / Device Role / Timing Role: Inverting DC-DC converter providing regulated negative rail independent of main system supply. Use Value: Enables single-cell or dual-cell battery operation while maintaining display contrast across battery discharge curve. |
Use Scenario: Powering analog front-end circuitry (op-amps, ADC references) requiring clean -5V supply in battery-operated multimeters and data loggers. IC Role / Device Role / Timing Role: Low-quiescent-current inverter supplying isolated negative rail for signal conditioning stages. Use Value: Extends battery life beyond 100 hours due to 120µA no-load current and efficient light-load PFM operation. |
| LAN Adapters | Remote Data-Acquisition Systems |
Use Scenario: Providing -5V bias for RS-232 transceivers (e.g., MAX232 derivatives) in compact Ethernet-to-serial interface modules. IC Role / Device Role / Timing Role: Compact inverting regulator replacing charge-pump solutions with higher current capability and lower ripple. Use Value: Delivers 250mA peak current needed for multi-driver RS-232 buses without thermal derating in SO-8 footprint. |
Use Scenario: Generating isolated -5V supply for sensor signal conditioning in solar-powered environmental monitoring nodes. IC Role / Device Role / Timing Role: Efficient inverting converter operating from wide-input 3–16V solar/battery sources with shutdown control for duty-cycled operation. Use Value: Achieves >82% efficiency at 10mA load (typical sleep current), minimizing energy waste during long idle periods. |
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; wider VIN range (2.7V–16.5V); no internal switch | Required for >250mA loads or outputs more negative than -16V; needs external FET and gate driver design | Select MAX774CSA when higher output power or adjustable -1V to -30V range is required; not drop-in compatible |
| LM2662MX/NOPB | Charge-pump inverter; no inductor; fixed -5V output; max 100mA; 120µA quiescent current; 1MHz switching | Suitable only for low-current, low-noise, space-constrained apps where inductor-free design is critical | Choose LM2662MX/NOPB for ultra-small PCB area and EMI-sensitive applications; cannot match MAX764CSA's 250mA capability or efficiency at medium loads |
Compared with MAX764CSA, MAX774CSA offers higher power but demands external component design and layout effort, while LM2662MX/NOPB eliminates magnetics at the cost of current capability and regulation accuracy-making MAX764CSA optimal for balanced performance in medium-power inverting applications.
Availability
MAX764CSA is available at Aetrix Electronics and suitable for LCD-bias generators, portable instrumentation, LAN adapters, and remote data-acquisition systems requiring stable component supply, extended temperature support (-40°C to +85°C), and long-term industrial lifecycle assurance.
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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX764CSA belongs to Maxim's legacy high-efficiency DC-DC inverter family, designed specifically for compact, battery-efficient negative rail generation in portable and distributed electronic systems.
FAQ
What output voltage does the MAX764CSA provide?
The MAX764CSA provides a factory-preset -5V output with ±4% tolerance. It also supports adjustable operation from -1V to -16V using two external resistors (R1 = 150kΩ, R2 calculated per VOUT = -1.5V × (1 + R2/R1)). Fixed-output mode requires tying FB directly to REF; no resistor network is needed for -5V use.
Can the MAX764CSA operate from a 3.3V input?
Yes, the MAX764CSA supports input voltages from 3V to 16V, so it functions correctly with a 3.3V source. However, maximum output current is reduced at low VIN - at 3.3V input, usable output is limited to approximately 50mA for -5V output based on the "Maximum Output Current vs. Supply Voltage" graph. For full 250mA capability, VIN ≥ 5V is recommended.
What is the shutdown behavior of the MAX764CSA?
When SHDN is driven high (≥1.6V), the MAX764CSA enters shutdown mode, disabling the internal reference, oscillator, and power switch. Supply current drops to <5µA, and the OUT pin discharges to ground through internal circuitry. Normal operation resumes within 2ms after SHDN is pulled low (≤0.4V), as shown in the "Time to Enter/Exit Shutdown" waveform.
Which inductor value is recommended for the MAX764CSA?
A 47µH surface-mount inductor is ideal for most MAX764CSA applications. Recommended types include Sumida CD75 series or Coilcraft DO3316P, with DC resistance <100mΩ and saturation current >0.75A. Inductor values between 22µH and 68µH are acceptable; lower values increase ripple and reduce efficiency, while higher values offer diminishing returns with potential size/cost penalties.
Does the MAX764CSA require an external diode?
Yes, the MAX764CSA requires an external Schottky diode (e.g., 1N5817 or 1N5818) rated for ≥0.75A average current. The diode conducts during the LX off-state to complete the inductor current path. High-speed silicon diodes (e.g., MUR105) may be substituted in high-temperature or low-leakage applications, though forward voltage penalty reduces efficiency at medium loads.
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:
- 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 (-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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