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Analog Devices Inc./Maxim Integrated MAX764CPA
- Part No.:
- MAX764CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX764CPA.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:900
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Product details
Overview
MAX764CPA 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 quiescent supply current. It targets battery-powered portable instruments and LCD-bias generation where low IQ and compact magnetics are critical.
For engineers reviewing the MAX764CPA datasheet, MAX764CPA pinout, MAX764CPA application, or MAX764CPA equivalent, this page delivers verified technical context, exact pin functions, real-world efficiency vs. load behavior, confirmed alternative options for -5V inverting conversion, and supply-chain support details specific to industrial and embedded design cycles.
Technical Context
The MAX764CPA 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 >80% efficiency across 0.1–250mA loads while maintaining ultra-low 120µA no-load supply current. Its internal 0.75A peak-current-rated P-channel MOSFET drives external inductors up to 300kHz switching frequency.
Operation relies on differential voltage between V+ and OUT (max 21V), with feedback via REF (1.5V ±1%) and FB pins; fixed -5V output is achieved by tying FB to REF, while adjustable operation (-1V to -16V) uses an external resistor divider. Shutdown mode reduces supply current to <5µA when SHDN is high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset -5V (±4%), or adjustable from -1V to -16V using external resistors - enables single-part flexibility across multiple bias rails. |
| Max Output Current | 250mA at V+ = 16V; derates to ~150mA at V+ = 5V - defines usable load range without thermal shutdown in plastic DIP package. |
| Supply Current (No Load) | 120µA max (TYP 90µA) - enables multi-year battery life in always-on portable instrumentation. |
| Shutdown Current | 5µA max - ensures near-zero power drain during system sleep modes. |
| Switching Frequency | Up to 300kHz - allows use of miniature <5mm surface-mount 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. |
| Reference Voltage | 1.500V ±10mV (TYP), tempco <40µV/°C - provides stable feedback for precision output regulation. |
Pinout & Package
MAX764CPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch width, lead finish Sn/Pb, and through-hole mounting. Pin 1 is OUT; pin 5 is GND; pins 6 and 7 are tied V+ inputs; pin 8 is LX (switch node).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Sense input for fixed-output mode | Connects directly to VOUT; used with FB to enable internal -5V regulation path. |
| GND (Pin 5) | Power and signal reference ground | Star-ground connection point for C1, C4, and C2 bypass caps; critical for noise control. |
| V+ (Pins 6, 7) | Positive power supply input | Must be shorted externally; requires 0.1µF ceramic bypass cap placed adjacent to pins 6/7 and GND. |
| LX (Pin 8) | Drain of internal P-channel MOSFET | Switching node driving external inductor; peak current limited to 0.75A; swing range = V+ to |VOUT| + diode drop. |
| REF (Pin 4) | 1.5V precision reference output | Sources up to 100µA; must be bypassed with 0.1µF capacitor to stabilize feedback loop. |
| SHDN (Pin 3) | Active-high shutdown control | TTL/CMOS-compatible; pull to GND for normal operation; drives supply current <5µA when high. |
| FB (Pin 2) | Feedback input | Connected to REF for fixed -5V; connected to external resistor divider for adjustable output. |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Combines 16µs max on-time and 2.3µs min off-time to sustain >80% efficiency from 0.1mA to full load - eliminates need for external compensation. |
| Integrated P-channel MOSFET | 0.75A peak current rating and 2.5Ω typical on-resistance - reduces BOM count to just inductor, diode, and two capacitors. |
| Dual-mode output configuration | Fixed -5V (via FB–REF tie) or adjustable -1V to -16V (via R1/R2 divider) - one footprint supports multiple system voltage rails. |
| Low-noise layout support | Separate V+ (pins 6/7) and GND (pin 5) pins plus dedicated REF bypass - enables star-ground topology minimizing ripple and EMI. |
| Wide temperature operation | 0°C to +70°C industrial grade (CPA suffix) - validated for use in handheld test equipment and remote data loggers. |
Applications
| Portable Instruments | LCD-Bias Generators |
|---|---|
Use Scenario: Handheld multimeters and oscilloscopes requiring isolated negative rail for analog front-end op-amps and ADC references. IC Role / Device Role / Timing Role: Inverting DC-DC converter generating stable -5V from single 9V battery or 3.7V Li-ion cell. Use Value: 120µA quiescent current extends battery life beyond 500 hours; 300kHz switching allows use of 47µH SMT inductor under 5mm diameter. |
Use Scenario: TFT-LCD modules in medical displays needing precise -5V gate driver bias for source/drain control. IC Role / Device Role / Timing Role: Fixed-output inverter supplying regulated negative voltage to LCD panel driver ICs. Use Value: ±4% output tolerance and <100mV ripple ensure consistent pixel contrast; internal MOSFET eliminates gate-drive timing skew. |
| Battery-Powered Applications | Remote Data-Acquisition Systems |
Use Scenario: Wireless sensor nodes powered by AA/AAA cells, requiring low-power negative supply for RS-232 transceivers or op-amp signal conditioning. IC Role / Device Role / Timing Role: High-efficiency inverter converting 3V–5.5V battery voltage to -5V rail with minimal standby loss. Use Value: 5µA shutdown current prevents battery drain during idle; PFM architecture maintains >75% efficiency even at 100µA load. |
Use Scenario: Industrial field transmitters deployed in unattended locations, needing reliable -5V for analog sensor excitation and isolation amplifiers. IC Role / Device Role / Timing Role: Robust inverting regulator operating across -40°C to +85°C ambient (with E-grade variants) and surviving 20V VIN–VOUT differential. Use Value: Internal current limiting protects against inductor saturation faults; 21V absolute max differential accommodates wide input/output swings in noisy environments. |
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 |
|---|---|---|---|
| MAX774CPA | Drives external P-channel MOSFET; supports up to 5W output; requires additional gate driver components. | Used when >250mA or >-5V output (e.g., -12V, -15V) is required; not pin-compatible. | Select MAX774CPA only if higher output power or different fixed voltage is needed - adds complexity but extends capability. |
| LM2662MX/NOPB | Charge-pump inverter (no inductor); 200mA max; 120µA quiescent current; fixed -5V output only. | Suitable for low-noise, low-EMI applications where inductor size or EMI is prohibitive; lower efficiency above 50mA. | Choose LM2662MX/NOPB for space-constrained PCBs without magnetics; avoid when >100mA load or >85% efficiency is required. |
Compared with MAX764CPA, MAX774CPA offers higher power but demands external FET and layout changes, while LM2662MX/NOPB eliminates inductors at the cost of load-dependent efficiency and reduced current capability - MAX764CPA remains optimal for balanced performance in medium-power inverting applications.
Availability
MAX764CPA is available at Aetrix Electronics and suitable for portable instruments, LCD-bias generators, and battery-powered applications requiring stable component supply, long-term lifecycle continuity, and industrial-temperature-grade reliability.
Supply support for MAX764CPA 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) designs precision analog and power-management ICs for industrial, automotive, and communications systems, with emphasis on high integration and low-power innovation.
The MAX764CPA belongs to Maxim's high-efficiency inverting DC-DC converter family, engineered specifically for battery-operated and space-constrained applications demanding ultra-low IQ, fixed or adjustable negative output, and minimal external component count.
FAQ
What is the exact output voltage tolerance of the MAX764CPA in fixed-mode operation?
The MAX764CPA delivers -5V output with ±4% tolerance over full temperature and load range (0°C to +70°C, 0–250mA). This is confirmed in the Electrical Characteristics table under "VOUT = -5V" condition, where guaranteed limits are -4.8V to -5.2V at TA = TMIN to TMAX. The MAX764CPA achieves this using its internal 1.5V reference and precision feedback network, making it suitable for analog circuitry requiring stable negative bias.
Can the MAX764CPA operate with a 3.3V input supply?
Yes, the MAX764CPA supports input voltages as low as 3V, making it fully compatible with 3.3V systems. At V+ = 3.3V, it can still deliver regulated -5V output provided the V+–VOUT differential remains ≤21V (3.3V – (–5V) = 8.3V, well within limit). However, maximum output current drops to ~80mA per the "Maximum Output Current vs. Supply Voltage" graph - confirming safe operation in low-voltage embedded designs using the MAX764CPA.
What is the recommended inductor value and type for the MAX764CPA in standard fixed-output design?
A 47µH shielded surface-mount inductor with ≤100mΩ DC resistance and ≥0.75A saturation current is recommended for the MAX764CPA. The datasheet explicitly states "a standard 47µH inductor is ideal for most applications", and lists Matsuo 267 series and Sumida RCH895 series as qualified options. Using this value ensures continuous conduction mode at moderate loads and minimizes radiated noise - critical for reliable MAX764CPA implementation.
How does the MAX764CPA enter and exit shutdown mode, and what is the timing?
The MAX764CPA enters shutdown when SHDN is pulled high (≥1.6V), reducing supply current to <5µA; it exits shutdown when SHDN falls below 0.4V, with typical startup time of <2ms as shown in the "Time to Enter/Exit Shutdown" waveform. During shutdown, the internal reference and bias circuits power down and OUT discharges to GND - ensuring clean state transitions in battery-gated systems using the MAX764CPA.
Is the MAX764CPA pin-compatible with other members of the MAX764/MAX765/MAX766 family?
Yes, the MAX764CPA shares identical pinout, package (8-pin plastic DIP), and electrical interface with MAX765CPA and MAX766CPA - all three are functionally pin-compatible. The only difference is preset output voltage (-5V, -12V, -15V respectively); otherwise, PCB layout, external components, and control signals (SHDN, FB, REF) are interchangeable - enabling single-board design reuse across multiple output requirements using the MAX764CPA or its siblings.
MAX764CPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX764CPA FAQ
1.How can I place an order for MAX764CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX764CPA 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 MAX764CPA reliable?
The price and inventory of MAX764CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX764CPA is usually 5 days.
3.What payment methods are accepted for MAX764CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX764CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX764CPA?
MAX764CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX764CPA 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 MAX764CPA?
For technical support, including MAX764CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX764CPA requirements.
6.How does Aetrix verify that MAX764CPA is sourced from the original manufacturer or authorized distributors?
All MAX764CPA 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 MAX764CPA meets industry standards.
7.What is the process for return or replacement of MAX764CPA?
All MAX764CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX764CPA, 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 MAX764CPA part is unused and in its original packaging.
Return procedure for MAX764CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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