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Analog Devices Inc./Maxim Integrated MAX764ESA+
- Part No.:
- MAX764ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX764ESA+.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:534
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Product details
Overview
MAX764ESA+ 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 low-power portable systems requiring compact, low-quiescent-power negative voltage generation.
For engineers reviewing the MAX764ESA+ datasheet, MAX764ESA+ pinout, MAX764ESA+ application, or MAX764ESA+ equivalent, key selection criteria include its fixed -5V output, 300kHz switching frequency enabling <5mm surface-mount magnetics, 5µA shutdown current, internal reference (1.5V), and compatibility with standard 47µH inductors and Schottky diodes like 1N5817.
Technical Context
The MAX764ESA+ 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 limiting peak LX current to 0.75A. This enables high efficiency (>80%) across light to heavy loads without external compensation.
It operates from the differential voltage between V+ and OUT, applying full gate drive to its internal P-channel MOSFET for low on-resistance (1.4–2.5Ω). The device supports both fixed-output mode (FB tied to REF) and adjustable mode (-1V to -16V via resistor divider), with feedback referenced to a stable 1.5V internal reference.
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, dual-cell alkaline, and wide industrial rails |
| Max Output Current | 250mA at V+ = 15V; derates to ~150mA at V+ = 5V per max-output-current vs. supply-voltage curve |
| No-Load Supply Current | ≤120µA - enables battery life extension in always-on portable instrumentation |
| Shutdown Current | ≤5µA - ensures ultra-low standby power when SHDN = high |
| Switching Frequency | Up to 300kHz - permits use of miniature surface-mount inductors (<5mm diameter) |
| Internal Reference | 1.500V ±30mV - provides precision feedback for stable output regulation |
Pinout & Package
MAX764ESA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant and rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Sense Input / Fixed-Output Mode Node | Connects directly to VOUT in fixed-output configuration; used with FB to close feedback loop |
| GND (Pin 5) | Ground Reference | Primary return path for all internal circuits and external bypass capacitors |
| V+ (Pins 6,7) | Positive Power-Supply Input | Dual-pin connection for low-impedance input routing; requires 0.1µF 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; swings from V+ to |VOUT| + diode drop |
| REF (Pin 4) | 1.5V Precision Reference Output | Sources up to 100µA; must be bypassed with 0.1µF capacitor for stability and noise rejection |
| SHDN (Pin 3) | Active-High Shutdown Control | TTL/CMOS-compatible input; pulls supply current below 5µA when high; tie to GND for normal operation |
| FB (Pin 2) | Feedback Input | Compares divided output voltage against REF; connect to REF for fixed -5V mode; connect to external resistor divider for adjustable output |
Key Features
| Feature | Design Value |
|---|---|
| Current-Limited PFM Control | Enables >80% efficiency across 0.1–250mA load range while avoiding subharmonic oscillation and eliminating need for external compensation |
| Integrated P-Channel MOSFET | Reduces BOM count by eliminating external switch; 1.4–2.5Ω on-resistance minimizes conduction loss at high loads |
| Ultra-Low Quiescent Current | 120µA typical no-load supply current extends battery runtime in handheld meters and remote sensors |
| Adjustable Output Range | -1V to -16V via two-resistor divider - supports custom bias voltages for LCDs, op-amp rails, and sensor interfaces |
| Robust Thermal Operation | Specified over -40°C to +85°C with 150°C max junction temperature - suitable for industrial and automotive cabin environments |
Applications
| LCD Bias Generation | Portable Instrumentation |
|---|---|
Use Scenario: Generating stable -5V bias for segment LCDs in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Inverting DC-DC converter providing regulated negative rail from single positive battery supply. Use Value: Eliminates need for dual-supply batteries or charge pumps; 120µA quiescent current preserves battery life during display-only operation. |
Use Scenario: Powering analog front-end circuitry (op-amps, ADC references) in battery-powered oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Negative voltage generator supplying clean, low-noise -5V rail for precision signal conditioning stages. Use Value: Internal 1.5V reference and low ESR capacitor support reduces output ripple to <50mV, maintaining measurement accuracy. |
| LAN Adapter Power | Battery-Powered Remote Sensing |
Use Scenario: Providing isolated -5V supply for RS-232 transceivers or Ethernet PHY bias in compact LAN interface modules. IC Role / Device Role / Timing Role: Compact inverting regulator enabling single-rail 3.3V/5V host system to drive legacy -5V interface ICs. Use Value: 300kHz switching allows use of 47µH SMT inductor - fits within tight PCB area constraints of mini-PCIe or M.2 form factors. |
Use Scenario: Supplying -5V to low-power sensor signal chains (e.g., piezoelectric amplifiers, MEMS bias) in wireless environmental monitors. IC Role / Device Role / Timing Role: Efficient negative rail generator operating intermittently during sensor wake-up cycles. Use Value: 5µA shutdown current ensures negligible drain during 99% sleep time; fast start-up (<1ms) enables rapid measurement bursts. |
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-channel MOSFET; supports up to 5W output; wider VIN (2.7V–16.5V); no internal switch | Required for >250mA loads or outputs beyond -16V; needs external FET, gate driver, and layout care | Select MAX774ESA+ when higher output power or adjustable negative voltages below -16V are needed. |
| TPS60403DBVR | Fixed -5V output; 600kHz switching; 60mA max output; 2.5µA quiescent current; no internal FET driver capability | Lower current, lower IQ, but unsuitable for >60mA loads; optimized for ultra-low-power microcontroller peripherals | Choose TPS60403DBVR only for sub-60mA applications where minimal standby current outweighs output capability. |
Compared with MAX764ESA+, MAX774ESA+ offers higher power and flexibility at the cost of increased component count and design complexity, while TPS60403DBVR trades output capability for ultra-low IQ in micro-power niches - neither is pin-compatible, and both require board-level redesign.
Availability
MAX764ESA+ is available at Aetrix Electronics and suitable for LCD-bias generation, portable instrumentation, LAN adapter power, and battery-powered remote sensing requiring stable component supply with extended temperature support.
Supply support for MAX764ESA+ 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, mixed-signal, and power management ICs for industrial, medical, communications, and consumer applications.
The MAX764ESA+ belongs to Maxim's high-efficiency, low-IQ inverting DC-DC converter family, engineered specifically for space-constrained, battery-sensitive applications needing reliable negative voltage rails without external switches.
FAQ
What is the output voltage configuration of the MAX764ESA+?
The MAX764ESA+ provides a factory-preset -5V output (±4%) in fixed-mode operation, achieved by connecting FB to REF. It also supports adjustable output from -1V to -16V using an external resistor divider referenced to its 1.5V internal reference. The MAX764ESA+ does not support positive output configurations or non-inverting topologies.
Can the MAX764ESA+ operate from a 3.3V input supply?
Yes, the MAX764ESA+ supports input voltages from 3V to 16V, making it fully compatible with 3.3V systems. At V+ = 3.3V, the maximum achievable output current is reduced due to the 20V VIN–VOUT differential limit and internal MOSFET on-resistance; typical output is ~100mA at -5V under those conditions, as confirmed by the "Maximum Output Current vs. Supply Voltage" graph.
What is the recommended inductor for the MAX764ESA+?
A 47µH surface-mount inductor is ideal for most MAX764ESA+ applications, as specified in the datasheet. It should have ≤100mΩ DC resistance, ferrite core, and ≥0.75A saturation current rating. Examples include Coilcraft D03316-473 or Sumida CD75-470. Lower values (22µH) increase ripple; higher values (68µH) reduce ripple but may impair transient response.
How does shutdown mode affect the MAX764ESA+ output voltage?
When SHDN is driven high, the MAX764ESA+ enters shutdown mode, reducing supply current to <5µA and disabling the internal reference and switching circuitry. As a result, the OUT pin discharges toward ground through internal paths, and no regulated output is maintained. To retain output voltage during shutdown, an external hold-up capacitor or auxiliary bias must be used.
Is the MAX764ESA+ pin-compatible with other devices in the MAX76x family?
Yes, the MAX764ESA+, MAX765ESA+, and MAX766ESA+ share identical 8-pin SO packaging and pinout. They differ only in factory-set output voltage (-5V, -12V, -15V respectively) and minor electrical tolerances. This allows direct substitution in fixed-output designs where voltage requirements change, provided the application's V+–VOUT differential remains within 20V absolute maximum.
MAX764ESA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX764ESA+ FAQ
1.How can I place an order for MAX764ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX764ESA+ 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+ reliable?
The price and inventory of MAX764ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX764ESA+ is usually 5 days.
3.What payment methods are accepted for MAX764ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX764ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX764ESA+?
MAX764ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX764ESA+ 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+?
For technical support, including MAX764ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX764ESA+ requirements.
6.How does Aetrix verify that MAX764ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX764ESA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX764ESA+?
All MAX764ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX764ESA+, 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+ part is unused and in its original packaging.
Return procedure for MAX764ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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