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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:1,149
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Product details
Overview
The 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 quiescent supply current. It targets space-constrained, battery-powered systems requiring stable negative bias rails.
For engineers reviewing the MAX764ESA datasheet, MAX764ESA pinout, MAX764ESA application, or MAX764ESA equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency vs. load behavior, real-world component selection guidance, and two rigorously cross-checked alternative parts for -5V inverting conversion.
Technical Context
The MAX764ESA uses a BiCMOS current-limited pulse-frequency-modulated (PFM) control scheme that enforces a 16µs maximum on-time and 2.3µs minimum off-time, with peak LX current limited to 0.75A. Its internal P-channel MOSFET operates with V+ tied directly to both power pins (6 & 7), enabling gate drive optimized for low on-resistance.
It supports dual-mode operation: fixed -5V output (via FB-to-REF connection) or adjustable -1V to -16V output (via external resistor divider). The 1.5V reference (REF pin) sources up to 100µA and requires a 0.1µF bypass capacitor; shutdown (SHDN) is active-high with <5µA leakage and full internal bias disable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | -5V fixed (MAX764 variant); no adjustment required for nominal LCD bias or 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 pre-regulation |
| Max Output Current | 250mA at V+ = 15V; derates to ~150mA at V+ = 5V per published curves - defines usable load envelope |
| Quiescent Supply Current | 120µA max (typ. 90µA); enables >1-year battery life in always-on remote sensors with 200mAh cells |
| Switching Frequency | Up to 300kHz; allows use of compact 47µH surface-mount inductors under 5mm diameter - eliminates custom magnetics |
| Shutdown Current | ≤5µA at TA = +25°C; drops to <1µA over temperature per test data - critical for ultra-low-power wake-up circuits |
| Reference Voltage | 1.47V to 1.53V (±2%); stable over -40°C to +85°C - ensures accurate feedback across industrial temperature range |
Pinout & Package
MAX764ESA is supplied in an 8-pin SO (Small Outline) package, 150mil width, with gull-wing leads and JEDEC MS-012AC compliance. Pin 1 is OUT; pin 5 is GND; pin 6/7 are internally connected V+ inputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Inverting output sense node | Connects directly to VOUT for fixed-mode regulation; must be tied to external feedback network for adjustable mode |
| GND (Pin 5) | Power and signal reference ground | Star-ground point for C1, C4, and C2 bypass caps; mandatory for EMI control and regulation stability |
| V+ (Pins 6 & 7) | Positive supply input (dual connection) | Internally tied; requires 0.1µF ceramic cap placed within 2mm of both pins to suppress switching noise |
| LX (Pin 8) | Drain of internal P-channel MOSFET | Swings from V+ (ON) to |VOUT| + diode drop (OFF); peak current limited to 0.75A - defines inductor saturation margin |
| REF (Pin 4) | 1.5V precision reference output | Sources ≤100µA; bypassed with 0.1µF to GND - supplies FB divider and external circuitry without loading |
| SHDN (Pin 3) | Active-high shutdown control | TTL/CMOS compatible; drives <5µA when high - fully disables bias circuits and discharges OUT to GND |
| FB (Pin 2) | Feedback input comparator | Compares divided VOUT against REF; tie to REF for -5V fixed mode; connect external R1/R2 for adjustable output |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Combines 16µs max on-time and 2.3µs min off-time with 0.75A peak current limit - enables >80% efficiency from 1mA to 250mA load |
| Internal P-channel MOSFET | Eliminates external switch and gate driver - reduces BOM count by ≥4 components and PCB area by >30mm² |
| Dual-mode output configuration | Fixed -5V (FB→REF) or adjustable -1V to -16V (R1/R2 divider) - supports one IC across multiple voltage rail requirements |
| Low-noise 1.5V reference | ±2% accuracy over -40°C to +85°C with <100Ω output impedance - enables precise feedback without external op-amp |
| Ultra-low shutdown current | <5µA at +25°C, <1µA at +85°C - extends shelf life and standby time in battery-backed instrumentation |
Applications
| Portable Instrument Power | LCD Bias Generation |
|---|---|
Use Scenario: Handheld multimeter or portable oscilloscope requiring isolated -5V rail for analog front-end op-amps and ADC references. IC Role / Device Role / Timing Role: Inverting DC-DC converter generating regulated -5V from single 9V alkaline or 3.7V Li-ion battery. Use Value: 120µA quiescent current extends battery life beyond 500 hours; 300kHz switching allows compact 47µH inductor fit in <100mm² board area. |
Use Scenario: Monochrome STN or FSTN LCD panel in medical monitor or industrial HMI needing stable -5V bias for contrast control. IC Role / Device Role / Timing Role: Fixed-output inverter supplying negative VEE rail to LCD driver ICs (e.g., HD44780, SSD1306). Use Value: ±4% output tolerance at -5V ensures consistent contrast across temperature; internal MOSFET avoids gate-drive layout complexity. |
| Remote Data-Acquisition System | Battery-Powered LAN Adapter |
Use Scenario: Solar-powered environmental sensor node transmitting via RS-485, requiring isolated -5V for transceiver bias and level-shifting. IC Role / Device Role / Timing Role: Primary negative rail generator from 3.3V or 5V system rail, supporting sleep/wake cycles. Use Value: <5µA shutdown current enables multi-year deployment; current-limited PFM maintains >75% efficiency even at 100µA load during sleep. |
Use Scenario: Compact Ethernet PHY module in handheld diagnostic tool, needing -5V for transformer center-tap bias and PHY analog sections. IC Role / Device Role / Timing Role: Inverting regulator powered from 5V USB or battery, driving isolated Ethernet magnetics interface. Use Value: 250mA output capability supports full-duplex PHY operation; SO package enables automated SMT assembly without lead spacing issues. |
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; no internal switch; requires gate driver and external FET | Used where >250mA or >-16V output needed; higher BOM count but scalable power | Select MAX774ESA when output current exceeds 250mA or when -12V/-15V variants (MAX765/MAX766) are insufficient for system headroom |
| LM2662MX/NOPB | Charge-pump inverter; no inductor; 100mA max output; 120kHz switching; 170µA quiescent current | Suitable only for low-current, low-noise, space-constrained apps; cannot match MAX764ESA's 250mA or PFM efficiency curve | Choose LM2662MX/NOPB only if inductor-free design is mandatory and load stays below 80mA - not a functional replacement |
Compared with MAX764ESA, MAX774ESA offers higher power scalability but adds layout complexity and component count, while LM2662MX/NOPB trades output capability and efficiency for inductorless simplicity - neither is pin-compatible, and MAX764ESA remains optimal for fixed -5V, medium-current, high-efficiency inverting needs.
Availability
MAX764ESA is available at Aetrix Electronics and suitable for portable instrumentation, LCD bias generation, remote data-acquisition systems, battery-powered LAN adapters, and industrial sensor nodes requiring stable component supply with guaranteed long-term sourcing.
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, and communications applications.
The MAX764ESA belongs to Maxim's high-efficiency inverting DC-DC converter family, engineered specifically for battery-powered and space-constrained systems needing reliable negative voltage rails with minimal quiescent power.
FAQ
What is the maximum output current capability of the MAX764ESA?
The MAX764ESA delivers up to 250mA at -5V when V+ = 15V, per the "Maximum Output Current vs. Supply Voltage" graph. At lower input voltages - e.g., V+ = 5V - the maximum sustainable output current drops to approximately 150mA due to reduced energy transfer per switching cycle and internal current-limit constraints. This behavior is confirmed across all temperature ranges specified for the MAX764ESA (-40°C to +85°C).
Does the MAX764ESA require an external inductor, and what value is recommended?
Yes, the MAX764ESA requires an external inductor. A 47µH surface-mount inductor is explicitly recommended in the datasheet for most applications, with core material rated for ≥0.75A peak current and DC resistance <100mΩ. Inductors between 22µH and 68µH are acceptable, but values below 47µH risk excessive conduction losses, while larger values offer diminishing returns in ripple reduction.
Can the MAX764ESA generate output voltages other than -5V?
Yes, the MAX764ESA supports adjustable output from -1V to -16V using two external resistors (R1 = 150kΩ fixed, R2 calculated per VOUT = -1.5V × (1 + R2/R1)). This dual-mode capability is inherent to the MAX764ESA silicon - the same die used in MAX764CPA/CSA/EPA/ESA packages - and does not require firmware or external programming.
What is the purpose of the dual V+ pins (pins 6 and 7) on the MAX764ESA?
Pins 6 and 7 are internally connected V+ inputs, designed to reduce parasitic inductance and improve high-frequency decoupling. Both pins must be tied together externally and bypassed with a 0.1µF ceramic capacitor placed as close as possible to the package - this configuration minimizes switching noise injection into the internal bias circuitry and stabilizes gate drive for the internal P-channel MOSFET.
How does the MAX764ESA behave during shutdown, and what is the typical shutdown current?
When SHDN (pin 3) is driven high, the MAX764ESA enters full shutdown: internal reference, oscillator, and bias circuits are disabled, OUT discharges to GND through an internal path, and total supply current drops to ≤5µA at +25°C (measured at V+). Over temperature, shutdown current remains <1µA at +85°C - verified in the "Shutdown Current vs. Temperature" characteristic plot.
MAX764ESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- -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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