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Analog Devices Inc./Maxim Integrated MAX761ESA
- Part No.:
- MAX761ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX761ESA.pdf
- Description:
- IC REG BOOST ADJ/5V 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,679
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Product details
Overview
MAX761ESA from Maxim Integrated is a high-efficiency, current-limited pulse-frequency-modulated (PFM) step-up DC-DC converter with internal 1A N-channel power MOSFET, fixed 12V output (±4% over temperature), 110µA max supply current, and -40°C to +85°C operating range. It delivers up to 150mA at 12V from a 5V input and is optimized for flash memory programming in battery-powered systems.
For engineers reviewing the MAX761ESA datasheet, MAX761ESA pinout, MAX761ESA application, or MAX761ESA equivalent, key selection criteria include its low-quiescent-current PFM control scheme, integrated LBI/LBO low-battery detection, bootstrapped vs. non-bootstrapped mode flexibility, and SO-8 package compatibility with industrial temperature requirements.
Technical Context
The MAX761ESA employs a proprietary current-limited PFM architecture combining 8µs maximum on-time and 1.3µs minimum off-time one-shots with peak current limiting (1A) to sustain continuous-conduction mode (CCM) under heavy loads while maintaining ultra-low 110µA supply current at light loads. Its 1.5V internal reference (±30mV tolerance) feeds both feedback regulation and the LBI comparator.
Operation supports two distinct power paths: bootstrapped mode (IC powered from VOUT, enabling 2.0V start-up and higher efficiency below 4V input) and non-bootstrapped mode (IC powered from V+, minimizing supply current but requiring external resistors for output setting). The LBI/LBO comparator provides 1.5V threshold with 20mV hysteresis and open-drain LBO output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% (guaranteed over -40°C to +85°C, 0–150mA load) |
| Input Voltage Range | 2.0V to 16.5V (2.0V min start-up in bootstrapped mode; no UVLO with internal resistors) |
| Supply Current | 110µA max (enables >1000-hour battery life in 10µA standby systems) |
| Shutdown Current | 5µA max (TTL/CMOS-compatible SHDN pin pulls supply bias offline) |
| Switching Frequency | Up to 300kHz (permits use of 18µH surface-mount inductors & compact 33µF OS-CON output caps) |
| Peak Switch Current | 1.0A (internal N-MOSFET supports 150mA @ 12V with margin for transient loads) |
| Reference Voltage | 1.50V ±30mV (feeds FB node and LBI comparator; 100µA source capability) |
| Low-Battery Threshold | 1.50V ±20mV (LBI input; LBO open-drain output asserts low with 20mV hysteresis) |
Pinout & Package
MAX761ESA is housed in an 8-pin SO (Small Outline) package, 150 mil width, RoHS-compliant, with exposed pad not connected internally. Pin 1 is marked by beveled corner or dot; pins are numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBI | Low-battery comparator input | Analog input referenced to 1.5V; sets trip point via resistor divider; must be ≤500kΩ to limit leakage error |
| SHDN | Active-high shutdown control | TTL/CMOS-compatible logic input; drives internal bias circuits offline when high; ties to GND for normal operation |
| V+ | Main power input / output sense | Input supply (2–16.5V); in bootstrapped mode, also serves as output voltage feedback path |
| FB | Feedback input | Connect to GND for fixed 12V bootstrapped operation; connect resistor divider for adjustable output |
| REF | 1.5V precision reference output | Stable 1.5V source (±30mV) capable of sourcing 100µA; requires 0.1µF ceramic bypass |
| LX | Power switch drain terminal | Drain of internal 1A N-MOSFET; peak current limited to 1.25A; requires Schottky catch diode (e.g., 1N5817) |
| GND | Analog/digital ground | Common return for REF, FB, LBI, SHDN, and power stage; star-ground connection critical for noise immunity |
| LBO | Low-battery open-drain output | Asserts low when LBI < 1.5V; requires external pull-up to V+ or VOUT; high-impedance during shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Combines 110µA quiescent current (light load) with 86% efficiency at 150mA via adaptive peak-current pulses and fixed timing windows |
| Integrated 1A N-channel MOSFET | Eliminates external switch; enables complete 12V/150mA boost solution with only inductor, diode, and two capacitors |
| Bootstrapped operation mode | Enables 2.0V start-up and higher gate drive for improved efficiency at low VIN (<4V), using VOUT to power internal circuitry |
| Dual-mode low-battery detection | Configurable LBI threshold with 20mV hysteresis; LBO open-drain output supports flexible system-level battery monitoring |
| Industrial temperature grade | -40°C to +85°C operation validated across full electrical specs; SO-8 package qualified per JEDEC MS-012 |
| Adjustable output option | Supports 5V–16.5V output via external resistor divider on FB pin; uses same 1.5V REF for accuracy and stability |
Applications
| Flash Memory Programming | PCMCIA Card Power |
|---|---|
Use Scenario: Providing regulated 12V programming voltage to NOR/NAND flash in portable data loggers and embedded controllers. IC Role / Device Role / Timing Role: Primary step-up regulator delivering 150mA at 12V with fast transient response to handle burst programming currents. Use Value: Enables single-cell Li-ion (3.0–4.2V) or dual-AA (2.4–3.2V) operation without external charge pumps or transformers. |
Use Scenario: Supplying 12V VCC for PCMCIA Type II card slots in handheld test equipment and field-deployable instruments. IC Role / Device Role / Timing Role: Standby-ready DC-DC converter with 5µA shutdown current and TTL-compatible SHDN for slot power sequencing. Use Value: Meets PCMCIA 2.1 specification for hot-swap VCC ramp time and inrush control while minimizing host battery drain. |
| Battery-Powered Medical Sensors | High-Efficiency Portable Instrumentation |
Use Scenario: Powering 12V analog front-end circuits (e.g., photodiode transimpedance amps) in wearable ECG monitors. IC Role / Device Role / Timing Role: Low-noise, low-IQ boost converter with LBI monitoring to trigger battery replacement alerts before brownout. Use Value: Extends coin-cell (CR2032) or AAA alkaline runtime by >30% versus PWM alternatives due to sub-110µA quiescent draw. |
Use Scenario: Generating stable 12V rail for precision ADC references and op-amp biasing in handheld multimeters and thermal imagers. IC Role / Device Role / Timing Role: Primary power stage with REF pin supplying clean 1.5V reference to external DACs and comparators. Use Value: Reduces component count by integrating reference, regulator, and battery monitor - eliminating three discrete ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX771CPA | Same PFM architecture but drives external MOSFET; no internal switch; 500kHz switching; wider input (2.7–16.5V) | Required for >150mA loads or >16.5V outputs; needs external FET, gate driver, and layout care | Select MAX771CPA when output current exceeds 150mA or when adjustable high-voltage rails (>16.5V) are needed. |
| TPS61040DRVR | 3.6V–5.5V input only; 28V max output; 0.4A switch; 500kHz fixed frequency; no LBI/LBO | Designed for single Li-ion input; lacks battery monitoring; higher IQ (55µA typ) but better light-load efficiency | Choose TPS61040DRVR for cost-sensitive, single-supply portable apps where battery monitoring is handled externally. |
Compared with MAX761ESA, MAX771CPA offers higher output flexibility at the cost of increased BOM and layout complexity, while TPS61040DRVR trades industrial temperature range and integrated battery detection for lower cost and higher switching frequency in narrow-input applications.
Availability
MAX761ESA is available at Aetrix Electronics and suitable for flash memory programming, PCMCIA card power, and battery-powered medical sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX761ESA 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 MAX761ESA belongs to Maxim's legacy high-efficiency PFM boost converter family, engineered specifically for ultra-low-power, wide-input-range DC-DC conversion in space-constrained, battery-operated systems.
FAQ
What is the minimum input voltage required for MAX761ESA to start up?
The MAX761ESA achieves guaranteed no-load start-up at 2.0V when operated in bootstrapped mode with internal feedback resistors. This is enabled by dedicated start-up circuitry that fixes 50% duty cycle until V+ reaches 2.5V. In non-bootstrapped mode or with external resistors, undervoltage lockout raises the effective start-up threshold to approximately 2.7V.
Can MAX761ESA be used to generate an adjustable output voltage?
Yes, the MAX761ESA supports adjustable output from 5V to 16.5V using an external resistor divider on the FB pin. The formula is R2 = R1 × (VOUT − 1.5V) / 1.5V, with R1 selected between 10kΩ and 250kΩ. For fixed 12V operation, FB must be tied directly to GND - this configuration is only valid in bootstrapped mode.
How does the LBI/LBO low-battery detector function in MAX761ESA?
The MAX761ESA's LBI pin compares applied voltage against its internal 1.5V reference. When LBI falls below 1.5V, the open-drain LBO pin pulls low (with 20mV hysteresis). LBO requires an external pull-up resistor (e.g., 100kΩ to VOUT) and is placed in high-impedance state during shutdown. LBI leakage must be minimized by keeping R3 ≤500kΩ in the divider network.
What are the key differences between bootstrapped and non-bootstrapped operation of MAX761ESA?
In bootstrapped mode, the MAX761ESA powers itself from VOUT, enabling 2.0V start-up, higher efficiency below 4V input, and fixed 12V output (FB = GND). In non-bootstrapped mode, it draws power from V+, reducing supply current but requiring external resistors for all output settings and disabling fixed-output capability. Efficiency drops at low VIN due to reduced gate drive.
Which external components are mandatory for basic MAX761ESA operation?
A functional MAX761ESA circuit requires four mandatory components: an 18µH power inductor (e.g., Sumida CD54-180), a Schottky catch diode (e.g., 1N5817), a 33µF low-ESR output capacitor (e.g., Sanyo OS-CON), and a 0.1µF ceramic bypass capacitor on REF. Additional components - including input capacitor, feedback resistors, and LBI/LBO network - depend on operating mode and feature usage.
MAX761ESA 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:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 5V (12V)
- Voltage - Output (Max):
- 16.5V
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX761ESA FAQ
1.How can I place an order for MAX761ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX761ESA 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 MAX761ESA reliable?
The price and inventory of MAX761ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX761ESA is usually 5 days.
3.What payment methods are accepted for MAX761ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX761ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX761ESA?
MAX761ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX761ESA 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 MAX761ESA?
For technical support, including MAX761ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX761ESA requirements.
6.How does Aetrix verify that MAX761ESA is sourced from the original manufacturer or authorized distributors?
All MAX761ESA 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 MAX761ESA meets industry standards.
7.What is the process for return or replacement of MAX761ESA?
All MAX761ESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX761ESA, 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 MAX761ESA part is unused and in its original packaging.
Return procedure for MAX761ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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