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Analog Devices Inc./Maxim Integrated MAX764EPA
- Part No.:
- MAX764EPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX764EPA.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,064
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Product details
Overview
The MAX764EPA 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 space-constrained, battery-powered systems requiring negative bias generation without external switching transistors.
For engineers reviewing the MAX764EPA datasheet, MAX764EPA pinout, MAX764EPA application, or MAX764EPA equivalent, key selection criteria include its fixed -5V output, 300kHz switching frequency enabling <5mm SMT magnetics, 5µA shutdown current, internal 1.5V reference, and compatibility with standard 47µH inductors and Schottky diodes like 1N5817.
Technical Context
The MAX764EPA uses a proprietary current-limited pulse-frequency modulation (PFM) control scheme that enforces a 16µs maximum on-time and 2.3µs minimum off-time, while dynamically adjusting peak current limit (0.75A) between half (0.375A) and full scale based on regulation status. This enables >80% efficiency across 0.1mA–250mA load range.
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. The LX pin swings from V+ (switch ON) to |VOUT| + diode drop (switch OFF), limiting absolute VIN–VOUT differential to 21V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -5V ±4%; supports adjustable mode (-1V to -16V) via external resistor divider |
| Input Voltage Range | 3V to 16V; requires ≥3.0V for startup under no-load conditions |
| Max Output Current | 250mA at V+ = 16V; derates to ~150mA at V+ = 5V per max-output-current vs. supply-voltage curve |
| Supply Current (No Load) | 120µA max; drops to ≤5µA in shutdown mode with SHDN high |
| Switching Frequency | Up to 300kHz; enables use of miniature surface-mount inductors (<5mm diameter) |
| Internal Reference | 1.5V ±30mV; stable over temperature, sources up to 100µA for external feedback networks |
| LX Peak Current Limit | 0.75A; programmable to 0.375A during light-load PFM pulses to improve efficiency |
Pinout & Package
MAX764EPA is housed in an 8-pin plastic DIP package (0.300" wide), rated for -40°C to +85°C operation. Pin 1 is OUT, pin 2 is FB, pin 3 is SHDN, pin 4 is REF, pin 5 is GND, pins 6 and 7 are V+, and pin 8 is LX.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Inverting output node | Connects directly to negative output rail; must be tied to VOUT in fixed-output configuration |
| FB (Pin 2) | Feedback input | Tied to REF for fixed -5V operation; connects to external resistor divider for adjustable output |
| SHDN (Pin 3) | Active-high shutdown control | Logic-high (>1.6V) disables switching and reduces supply current to <5µA; TTL/CMOS compatible |
| REF (Pin 4) | 1.5V precision reference output | Sources up to 100µA; requires 0.1µF bypass capacitor to GND for stability |
| GND (Pin 5) | Power and signal ground | Common return for input bypass, output filter, and reference decoupling; star-ground connection recommended |
| V+ (Pins 6, 7) | Positive power supply input | Must be connected together; accepts 3V–16V; requires 0.1µF ceramic bypass capacitor placed adjacent to pins |
| LX (Pin 8) | Drain of internal P-channel MOSFET | Switching node driving external inductor; peak current limited to 0.75A; voltage swing spans V+ to |VOUT| + diode drop |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Combines ultra-low IQ (<120µA) of PFM with high heavy-load efficiency (>82%) of PWM via dynamic peak-current scaling |
| Integrated P-channel MOSFET | Eliminates need for external switch; reduces BOM count and layout complexity in low-to-medium power inverters |
| 300kHz switching frequency | Enables use of compact, off-the-shelf 47µH SMT inductors (e.g., Sumida CD75 series) without custom magnetics design |
| Wide input voltage range | 3V–16V operation supports single-cell Li-ion, multi-cell alkaline/NiMH, and industrial 5V/12V rails |
| Low shutdown current | <5µA shutdown leakage allows extended battery life in portable instruments with periodic wake-up cycles |
Applications
| LCD Bias Generation | Portable Instrument Power |
|---|---|
Use Scenario: Generating stable -5V bias for STN or TFT LCD segment drivers in handheld test meters and medical monitors. IC Role / Device Role / Timing Role: Inverting DC-DC converter providing regulated negative rail from single positive battery supply. Use Value: Enables direct LCD interface without external charge pumps or transformers; 120µA IQ extends battery runtime beyond 100 hours in sleep mode. |
Use Scenario: Powering analog front-ends and microcontroller peripherals in battery-operated multimeters and data loggers. IC Role / Device Role / Timing Role: Primary negative supply generator for op-amps, ADC references, and sensor signal conditioning circuits. Use Value: Fixed -5V output eliminates trimming resistors; 250mA capability supports simultaneous analog and digital loads without thermal derating. |
| LAN Adapter Interface | Remote Data-Acquisition System |
Use Scenario: Supplying isolated -5V for RS-232 line drivers and Ethernet PHY bias in compact network interface cards. IC Role / Device Role / Timing Role: Compact inverter replacing discrete transistor-based charge pumps in space-constrained PCB layouts. Use Value: 300kHz operation minimizes EMI near high-speed digital traces; DIP package simplifies manual rework during prototyping. |
Use Scenario: Providing clean -5V rail for precision instrumentation amplifiers and isolation barrier ICs in field-deployed environmental sensors. IC Role / Device Role / Timing Role: Negative voltage source for signal conditioning stages requiring dual-supply op-amps and level-shifting circuitry. Use Value: -40°C to +85°C rating ensures reliable operation in uncontrolled outdoor enclosures; 21V VIN–VOUT differential accommodates varying battery states. |
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 | External P-channel MOSFET driver; supports up to 5W output; wider input range (2.7V–16.5V); no internal switch | Required when >250mA output or >-5V magnitude (e.g., -12V) is needed; adds external FET and gate-drive components | Select MAX774CPA only if higher output power or adjustable negative voltages beyond -5V are required; not a drop-in replacement |
| LM2662CN/NOPB | Charge-pump inverter; no inductor; 20mA max output; 99% typical efficiency at light loads; 120kHz fixed frequency | Suitable only for ultra-low-power, low-current biasing (e.g., op-amp nulling); cannot support 250mA loads or wide input ranges | Choose LM2662CN/NOPB for cost-sensitive, low-noise, inductor-free designs where output current ≤20mA suffices |
Compared with MAX764EPA, MAX774CPA offers higher power but requires external MOSFET and increases component count, while LM2662CN/NOPB trades output capability for simplicity and zero-inductor layout-making MAX764EPA optimal for medium-current, inductor-based -5V generation with minimal BOM.
Availability
MAX764EPA is available at Aetrix Electronics and suitable for LCD-bias generators, portable instrument power supplies, LAN adapter interfaces, and remote data-acquisition systems requiring stable component supply across industrial temperature ranges.
Supply support for MAX764EPA 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 MAX764EPA belongs to Maxim's legacy high-efficiency inverting DC-DC converter product line, designed specifically for compact, low-quiescent-current negative voltage generation in battery-powered and space-constrained systems.
FAQ
What is the output voltage configuration of the MAX764EPA?
The MAX764EPA provides a factory-preset -5V output (±4%) when FB is connected to REF. It also supports adjustable operation from -1V to -16V using two external resistors (R1 = 150kΩ, R2 calculated per VOUT = -1.5V × (1 + R2/R1)). The MAX764EPA does not support positive output configurations or non-inverting topologies.
Can the MAX764EPA operate from a 3.3V input supply?
Yes, the MAX764EPA supports input voltages as low as 3.0V. At 3.3V input, it delivers up to ~100mA at -5V output while maintaining >75% efficiency, as confirmed by the "Maximum Output Current vs. Supply Voltage" graph in the datasheet. Startup is guaranteed above 3.0V with no load.
What is the purpose of the dual V+ pins (pins 6 and 7) on the MAX764EPA?
Pins 6 and 7 are internally bonded to the same V+ node and must be connected together externally. This dual-pin arrangement improves current handling and reduces parasitic inductance in the high-side power path. Both pins require individual 0.1µF ceramic bypass capacitors routed to GND with minimal trace length for optimal noise suppression.
How does the MAX764EPA achieve low quiescent current in active operation?
The MAX764EPA achieves ≤120µA no-load supply current through its current-limited PFM architecture: it skips switching cycles entirely when regulation is maintained, eliminating switching losses, and uses BiCMOS circuitry with optimized bias networks. This is distinct from PWM regulators, which typically draw 2mA–10mA even at no load.
Is the MAX764EPA pin-compatible with other members of the MAX764/MAX765/MAX766 family?
Yes, the MAX764EPA shares identical pinout, package, and footprint with MAX765EPA (-12V) and MAX766EPA (-15V). However, output voltage is fixed per device; substituting MAX764EPA for MAX765EPA will deliver -5V instead of -12V, requiring verification of downstream load compatibility before interchange.
MAX764EPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX764EPA FAQ
1.How can I place an order for MAX764EPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX764EPA 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 MAX764EPA reliable?
The price and inventory of MAX764EPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX764EPA is usually 5 days.
3.What payment methods are accepted for MAX764EPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX764EPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX764EPA?
MAX764EPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX764EPA 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 MAX764EPA?
For technical support, including MAX764EPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX764EPA requirements.
6.How does Aetrix verify that MAX764EPA is sourced from the original manufacturer or authorized distributors?
All MAX764EPA 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 MAX764EPA meets industry standards.
7.What is the process for return or replacement of MAX764EPA?
All MAX764EPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX764EPA, 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 MAX764EPA part is unused and in its original packaging.
Return procedure for MAX764EPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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