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Analog Devices Inc./Maxim Integrated MAX764ESA+T
- Part No.:
- MAX764ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX764ESA+T.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,956
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Product details
Overview
The MAX764ESA+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, operating from 3V to 16V input, and consuming only 120µA quiescent supply current. It targets space-constrained, battery-powered systems requiring stable negative bias rails.
For engineers reviewing the MAX764ESA+T datasheet, MAX764ESA+T pinout, MAX764ESA+T application, or MAX764ESA+T equivalent, key selection criteria include its fixed -5V output, 300kHz switching frequency, 120µA no-load supply current, shutdown current <5µA, and compatibility with miniature 47µH surface-mount inductors.
Technical Context
The MAX764ESA+T uses a proprietary current-limited pulse-frequency modulation (PFM) control scheme that enforces a 16µs maximum on-time and 2.3µs minimum off-time, enabling >80% efficiency across load currents from 1mA to 250mA. Its BiCMOS architecture integrates a 1.5V reference, error comparator, and peak-current-sensing circuitry tied to the LX pin.
It operates in either continuous- or discontinuous-conduction mode depending on load and input voltage, with peak inductor current limited to 0.75A. The device powers itself from the differential between V+ and VOUT, maximizing gate drive to the internal P-MOSFET and minimizing on-resistance-critical for efficiency at light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -5V ±4%; enables direct replacement of linear regulators in LCD bias and portable instrument rails. |
| Input Voltage Range | 3V to 16V; supports single-cell Li-ion (4.2V), dual-cell alkaline (3V), and industrial 12V rails without external LDO pre-regulation. |
| Max Output Current | 250mA at V+ = 16V; sufficient for driving multiple op-amp stages or small LCD segments without derating. |
| No-Load Supply Current | ≤120µA typical; extends battery life in always-on monitoring circuits where standby power dominates energy budget. |
| Shutdown Current | ≤5µA max; ensures negligible drain during system sleep modes, critical for multi-year battery operation. |
| Switching Frequency | Up to 300kHz; allows use of compact ≤5mm-diameter SMT inductors (e.g., 47µH), reducing PCB footprint vs. 50–100kHz alternatives. |
| Internal Power Switch | P-channel MOSFET with 2.5Ω typical on-resistance; eliminates external FET and gate driver, reducing BOM count and layout complexity. |
Pinout & Package
MAX764ESA+T is housed in an 8-pin SO (Small Outline) package with standard 1.27mm pitch, JEDEC MS-012AC compliant, and RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 5) | Power and signal reference ground | Must be connected to system ground plane; serves as return path for REF, FB, and internal bias currents. |
| V+ (Pins 6,7) | Positive input supply rail | Dual-pin connection reduces trace resistance and inductance; requires 0.1µF ceramic bypass capacitor placed adjacent to pins. |
| LX (Pin 8) | Drain of internal P-MOSFET | Swings from V+ (ON) to |VOUT| + diode drop (OFF); peak current limited to 0.75A; connects directly to inductor. |
| REF (Pin 4) | 1.5V precision reference output | Sources up to 100µA; used for feedback divider bias or external circuitry; requires 0.1µF bypass to GND. |
| SHDN (Pin 3) | Active-high TTL/CMOS shutdown control | Logic-high (>1.6V) disables switching and drops supply current to <5µA; tie to GND for normal operation. |
| FB (Pin 2) | Feedback input for output regulation | Connected to REF for fixed -5V mode; accepts external resistor divider for adjustable outputs from -1V to -16V. |
| OUT (Pin 1) | Output sense node | Internally connected to VOUT; must be wired to negative output rail to close regulation loop in fixed-output configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Combines 16µs max on-time and 2.3µs min off-time to maintain >80% efficiency from 1mA to full load-unlike pure PFM devices that degrade at heavy loads. |
| Integrated P-channel MOSFET | Eliminates need for external switch and driver, reducing component count by ≥4 parts and simplifying layout for compact portable designs. |
| Ultra-low IQ operation | 120µA typical no-load supply current enables >1-year battery life in 10µA average-power IoT sensors using coin cells. |
| Miniature magnetics support | 300kHz operation allows use of standard 47µH SMT inductors (e.g., Coilcraft XAL4020), avoiding custom magnetics and speeding time-to-market. |
| Wide input range with differential powering | Self-powers from V+–VOUT differential, enabling efficient operation even when V+ is only 3V and VOUT is -5V (8V total). |
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 converter generating regulated negative supply from single 9V alkaline battery. Use Value: Enables true bipolar signal conditioning without split batteries; 120µA IQ extends battery life to >200 hours of continuous use. |
Use Scenario: Monochrome STN LCD panel in medical diagnostic device needing stable -5V VEE bias. IC Role / Device Role / Timing Role: Fixed-output inverter supplying precise negative gate drive voltage for LCD segment drivers. Use Value: Maintains contrast stability over temperature (-40°C to +85°C) due to tight -5V ±4% output tolerance and low line/load regulation. |
| Remote Data-Acquisition System | Battery-Powered LAN Adapter |
Use Scenario: Solar-powered environmental sensor node transmitting data via RS-485, requiring isolated -5V for transceiver bias. IC Role / Device Role / Timing Role: Efficient negative rail generator operating from 3.6V LiFePO₄ battery with intermittent solar recharge. Use Value: 5µA shutdown current prevents battery drain during idle periods; PFM operation maintains >75% efficiency at 100µA load. |
Use Scenario: Compact Ethernet PHY module in portable test equipment powered by USB 5V, needing -5V for PHY interface logic. IC Role / Device Role / Timing Role: Inverting regulator converting USB 5V to -5V while coexisting with noise-sensitive 100BASE-TX signals. Use Value: 300kHz switching frequency places ripple outside Ethernet band; star-ground layout guidance minimizes EMI coupling into MDI lines. |
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 |
|---|---|---|---|
| MAX774ESA+ | Drives external P-MOSFET; supports up to 5W output; adjustable -1V to -24V; higher IQ (250µA) | Suitable for higher-power LCD bias or industrial analog modules requiring >250mA or wider voltage range | Select MAX774ESA+ when output current exceeds 250mA or output voltage must go below -5V or above -15V. |
| TPS60403DBVR | TI part; fixed -5V; 60mA max output; 2.5µA IQ; 1MHz switching; no internal MOSFET gate drive limitation | Targeted at ultra-low-power microcontroller peripherals where 60mA suffices and 2.5µA IQ is mandatory | Choose TPS60403DBVR only for sub-60mA loads where nanoamp-level shutdown current outweighs output capability. |
Compared with MAX774ESA+, the MAX764ESA+ offers lower IQ and simpler layout but lacks scalability beyond 250mA; versus TPS60403DBVR, it delivers 4× more output current at the cost of 50× higher quiescent current-making MAX764ESA+ optimal for medium-power portable instrumentation.
Availability
MAX764ESA+T is available at Aetrix Electronics and suitable for portable instruments, LCD-bias generation, remote data-acquisition systems, and battery-powered LAN adapters requiring stable component supply with guaranteed long-term availability.
Supply support for MAX764ESA+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX764ESA+T belongs to Maxim's legacy high-efficiency inverting DC-DC converter family, designed specifically for battery-powered portable equipment needing compact, low-IQ negative voltage rails without external MOSFETs.
FAQ
What is the output voltage configuration of the MAX764ESA+T?
The MAX764ESA+T provides a fixed -5V output with ±4% tolerance across temperature and load. It achieves this by internally connecting the FB pin to the 1.5V reference; no external resistors are needed for nominal operation. The MAX764ESA+T does not support adjustable output unless modified externally via resistor divider-however, such modification voids the factory calibration and specified performance guarantees.
Can the MAX764ESA+T operate from a 3.3V input supply?
Yes, the MAX764ESA+T supports input voltages from 3V to 16V, so 3.3V is within specification. At 3.3V input, the maximum achievable output current drops to approximately 100mA due to reduced V+–VOUT differential headroom. The MAX764ESA+T remains functional and maintains regulation, but designers should consult the "Maximum Output Current vs. Supply Voltage" graph in the datasheet to confirm performance at their specific V+ and load conditions.
What is the recommended inductor for the MAX764ESA+T?
The datasheet specifies a 47µH inductor as ideal for most MAX764ESA+T applications. It must handle ≥0.75A peak current, have low DC resistance (<100mΩ preferred), and use ferrite or equivalent core material. Surface-mount examples include Coilcraft XAL4020-472MEB or Sumida CDRH8D28R-470MC. Through-hole alternatives like Renco RL1284-470K are also validated. Inductor selection directly impacts efficiency and thermal performance of the MAX764ESA+T.
Does the MAX764ESA+T require an input bypass capacitor?
Yes-the MAX764ESA+T requires a minimum 100µF low-ESR input capacitor (e.g., 120µF/20V tantalum) plus a 0.1µF ceramic capacitor placed directly between V+ and GND pins. This dual-capacitor arrangement suppresses high-frequency switching noise and limits peak input current surges. Omitting or undersizing these capacitors risks instability, increased EMI, and premature failure of the MAX764ESA+T under transient load conditions.
How does shutdown mode affect the MAX764ESA+T output voltage?
When SHDN is driven high (>1.6V), the MAX764ESA+T enters shutdown mode: switching ceases, the internal reference and bias circuitry power down, and the OUT pin discharges to GND through an internal path. As a result, the output voltage collapses to near 0V-not maintained at -5V. This behavior is intentional and ensures zero load current draw during system sleep, making the MAX764ESA+T suitable for applications requiring deep power-down states.
MAX764ESA+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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX764ESA+T FAQ
1.How can I place an order for MAX764ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX764ESA+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 MAX764ESA+T reliable?
The price and inventory of MAX764ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX764ESA+T is usually 5 days.
3.What payment methods are accepted for MAX764ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX764ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX764ESA+T?
MAX764ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX764ESA+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 MAX764ESA+T?
For technical support, including MAX764ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX764ESA+T requirements.
6.How does Aetrix verify that MAX764ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX764ESA+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 MAX764ESA+T meets industry standards.
7.What is the process for return or replacement of MAX764ESA+T?
All MAX764ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX764ESA+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 MAX764ESA+T part is unused and in its original packaging.
Return procedure for MAX764ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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