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Analog Devices Inc./Maxim Integrated MAX761ESA+T
- Part No.:
- MAX761ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX761ESA+T.pdf
- Description:
- IC REG BOOST ADJ/5V 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,823
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Product details
Overview
MAX761ESA+T 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, 12V fixed or adjustable output, 2V–16.5V input range, and 110µA max supply current. 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+T datasheet, MAX761ESA+T pinout, MAX761ESA+T application, or MAX761ESA+T equivalent, key selection considerations include its ultra-low quiescent current, integrated low-battery comparator (LBI/LBO), bootstrapped vs. non-bootstrapped operation modes, and SO-8 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The MAX761ESA+T employs a proprietary current-limited PFM control scheme that combines 86% peak efficiency at full load with sub-110µA quiescent current under light loads. Its dual-mode operation-bootstrapped (V+ powered from VOUT) and non-bootstrapped (V+ powered directly from VIN)-enables flexible trade-offs between efficiency, start-up voltage (as low as 2.0V in bootstrapped mode), and output drive capability.
It integrates a 1.5V reference (±30mV over temperature), LBI/LBO low-battery detection with 20mV hysteresis, and a 300kHz switching frequency enabling compact 18µH surface-mount inductors. The internal 1Ω LX on-resistance and 1A peak current limit support continuous-conduction mode (CCM) operation under heavy loads while maintaining fast transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12V fixed (internal resistors) or adjustable from 5V to 16.5V (external divider); enables single-part flexibility across multiple rail requirements. |
| Input Voltage Range | 2.0V to 16.5V; supports direct operation from single Li-ion, multi-cell alkaline, or wide-range industrial supplies. |
| Max Output Current | 150mA at 12V with 5V input; sufficient for flash memory programming pulses without external boost stages. |
| Supply Current | 110µA max (typ. 300µA at 5V); enables >1-year battery life in intermittent-use portable applications. |
| Shutdown Current | 5µA max; reduces system standby power to negligible levels during sleep states. |
| Switching Frequency | Up to 300kHz; allows use of small 18µH SMT inductors and minimizes EMI compared to lower-frequency alternatives. |
| Operating Temperature | –40°C to +85°C; qualified for industrial and extended-temperature embedded environments. |
| Reference Voltage | 1.50V ±30mV (–40°C to +85°C); provides stable feedback and low-battery threshold reference across full temp range. |
Pinout & Package
MAX761ESA+T is housed in an 8-pin SO (Small Outline) package with standard 1.27mm pitch, JEDEC MS-012AC compliant, and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBI | Low-battery comparator input | Accepts voltage divider from V+ to set trip point (e.g., 3.0V); 20mV hysteresis prevents chatter near threshold. |
| SHDN | Active-high shutdown control | TTL/CMOS-compatible; pulls internal bias off when high, reducing ICC to <5µA and disconnecting REF/LBO. |
| V+ | Main power input / output sense node | In bootstrapped mode, also serves as output voltage feedback reference; supports 2V–16.5V input range. |
| FB | Feedback input | Connect to GND for fixed 12V bootstrapped output; connect resistor divider for adjustable output or non-bootstrapped operation. |
| REF | 1.5V precision reference output | Sources up to 100µA; requires 0.1µF bypass capacitor; used for external circuitry or LBI threshold setting. |
| LX | Internal N-FET drain node | Switching node driving external inductor/diode; 1Ω on-resistance, 1A peak current limit, 1.5A absolute max. |
| GND | Analog/digital ground reference | Star-ground connection point for C1, C2, C4; critical for noise immunity and stability in high-di/dt switching paths. |
| LBO | Open-drain low-battery output | Asserts low when LBI < 1.5V; requires external pull-up to V+ or VOUT; high-impedance during SHDN. |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables 86% efficiency across 0.1–150mA load range while holding IQ <110µA - eliminates need for separate light-load and heavy-load topologies. |
| Integrated 1A N-channel power FET | Eliminates external switch, gate driver, and associated layout complexity; reduces BOM count and PCB area by ≥30% vs. controller-based solutions. |
| Bootstrapped operation mode | Allows start-up from as low as 2.0V input and improves gate drive efficiency - essential for single-cell Li-ion or depleted alkaline battery operation. |
| On-chip low-battery detector (LBI/LBO) | Provides system-level battery monitoring without external comparators or references; 20mV hysteresis ensures robustness against supply noise. |
| 1.5V precision reference (REF) | Stable ±30mV over –40°C to +85°C; usable for external ADC references, sensor biasing, or programmable thresholds - reduces need for discrete references. |
| 300kHz switching frequency | Permits use of tiny 18µH SMT inductors (e.g., Sumida CD54-180) and low-ESR 33µF OS-CON output capacitors - enables <100mm² total solution size. |
Applications
| Flash Memory Programming | PCMCIA Card Power |
|---|---|
Use Scenario: Generating 12V programming voltage for NOR/NAND flash erase/write cycles in portable data loggers or handheld terminals. IC Role / Device Role / Timing Role: Primary step-up regulator supplying regulated 12V/150mA pulses synchronized to memory command timing. Use Value: Ultra-low 110µA quiescent current extends battery life between programming events; fast start-up (<100µs) ensures immediate voltage availability upon command. |
Use Scenario: Providing isolated 12V auxiliary supply for PCMCIA Type II card interface logic and I/O buffers in laptop expansion slots. IC Role / Device Role / Timing Role: Standby-capable boost converter delivering clean 12V rail only when card is inserted and active. Use Value: 5µA shutdown current prevents parasitic drain on host battery; LBO signal alerts host OS of low main battery before card operation fails. |
| Battery-Powered Medical Sensors | Industrial Handheld Scanners |
Use Scenario: Powering 12V analog front-end circuits (e.g., photodiode transimpedance amps) in wearable glucose monitors or pulse oximeters. IC Role / Device Role / Timing Role: Low-noise, low-IQ boost stage feeding precision analog signal chain; REF pin supplies bias for sensor conditioning. Use Value: 1.5V reference accuracy (±30mV) enables calibrated sensor gain; SO-8 package supports automated assembly in compact wearable PCBs. |
Use Scenario: Supplying 12V to laser diode drivers and CCD image sensors in ruggedized barcode scanners operating from 3.6V Li-ion packs. IC Role / Device Role / Timing Role: High-reliability boost converter supporting repeated 150mA pulsed loads during scan bursts. Use Value: –40°C to +85°C rating ensures operation in cold warehouses or hot factory floors; CCM mode delivers stable output during rapid load transients. |
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+ | Drives external MOSFET; no internal switch; higher output voltage capability (up to 28V); 200µA IQ. | Used where >150mA output or >16.5V output is required; needs external FET, gate driver, and more board space. | Select MAX771CPA+ only if output current exceeds 150mA or output voltage must exceed 16.5V - not a drop-in replacement. |
| TPS61040DRVR | 3.6V–5.5V input only; 28V max output; 500kHz switching; 25µA IQ; no integrated LBI/LBO or REF. | Optimized for single Li-ion input with ultra-low IQ; lacks battery monitoring and reference functions present in MAX761ESA+T. | Choose TPS61040DRVR for lowest possible quiescent current in narrow-input applications where LBI/LBO/REF are handled externally. |
Compared with MAX771CPA+ and TPS61040DRVR, the MAX761ESA+T uniquely integrates power switch, low-battery detection, and precision reference in one SO-8 package - simplifying design for 12V flash programming and industrial battery-powered systems requiring moderate output current and wide input range.
Availability
MAX761ESA+T is available at Aetrix Electronics and suitable for flash memory programming, PCMCIA card power, and battery-powered medical sensors requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX761ESA+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) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The MAX761ESA+T belongs to Maxim's legacy high-efficiency, low-IQ DC-DC converter family, engineered specifically for battery-critical applications like flash memory programming and portable instrumentation where minimal quiescent current and integrated system functions are essential.
FAQ
What is the minimum input voltage required for MAX761ESA+T to start up?
The MAX761ESA+T achieves no-load start-up at 2.0V in bootstrapped mode (with internal feedback resistors). In non-bootstrapped mode or with external resistors, start-up requires ~2.7V due to undervoltage lockout. This makes the MAX761ESA+T suitable for deeply discharged single-cell Li-ion or multi-cell alkaline sources where other converters fail to initialize.
Can MAX761ESA+T be used to generate an adjustable output voltage?
Yes, the MAX761ESA+T supports adjustable output from 5V to 16.5V using two external resistors on the FB pin. For bootstrapped operation, connect R1 between V+ and FB, and R2 between FB and GND. The formula is R2 = R1 × (VOUT − 1.5V)/1.5V. Fixed 12V output is achieved by tying FB to GND - a configuration exclusive to bootstrapped mode.
How does the low-battery detector (LBI/LBO) function in MAX761ESA+T?
The MAX761ESA+T's LBI pin compares applied voltage to its internal 1.5V reference; when LBI falls below 1.5V, the open-drain LBO pin pulls low (with 20mV hysteresis). A resistor divider from V+ to GND sets the trip point (e.g., 3.0V). During SHDN, LBO goes high-impedance and LBI is ignored - ensuring clean system-level battery monitoring independent of regulator state.
What is the purpose of the REF pin on MAX761ESA+T, and how should it be used?
REF provides a buffered 1.5V ±30mV reference output capable of sourcing up to 100µA. It must be bypassed with a 0.1µF ceramic capacitor placed close to the pin. REF can power external comparators, bias sensor circuits, or set LBI trip points - eliminating need for discrete references and improving system accuracy and integration density in space-constrained designs.
Does MAX761ESA+T support both continuous and discontinuous conduction modes?
Yes, the MAX761ESA+T automatically operates in continuous-conduction mode (CCM) under heavy loads (e.g., 150mA) for high efficiency and fast transient response, and transitions to discontinuous-conduction mode (DCM) at light loads to maintain regulation with minimal ripple. Its current-limited PFM control ensures seamless mode transition without external intervention or performance degradation.
MAX761ESA+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:
- 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+T FAQ
1.How can I place an order for MAX761ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX761ESA+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 MAX761ESA+T reliable?
The price and inventory of MAX761ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX761ESA+T is usually 5 days.
3.What payment methods are accepted for MAX761ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX761ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX761ESA+T?
MAX761ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX761ESA+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 MAX761ESA+T?
For technical support, including MAX761ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX761ESA+T requirements.
6.How does Aetrix verify that MAX761ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX761ESA+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 MAX761ESA+T meets industry standards.
7.What is the process for return or replacement of MAX761ESA+T?
All MAX761ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX761ESA+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 MAX761ESA+T part is unused and in its original packaging.
Return procedure for MAX761ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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