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Analog Devices Inc./Maxim Integrated MAX761EPA+
- Part No.:
- MAX761EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX761EPA+.pdf
- Description:
- IC REG BOOST ADJ/5V 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,263
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Product details
Overview
MAX761EPA+ 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 2V to 16.5V input range. It delivers up to 150mA at 12V from a 5V input and integrates low-battery detection (LBI/LBO) and 1.5V reference output - optimized for flash memory programming in battery-powered systems.
For engineers reviewing the MAX761EPA+ datasheet, MAX761EPA+ pinout, MAX761EPA+ application, or MAX761EPA+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (bootstrapped/non-bootstrapped), real-world efficiency curves, and two rigorously cross-checked alternative parts for 12V boost applications requiring low quiescent current and integrated power FET.
Technical Context
The MAX761EPA+ employs a proprietary current-limited PFM control scheme that combines ultra-low 110µA supply current (vs. 2–10mA in PWM converters) with 86% peak efficiency across 0–150mA loads. Its internal 1A N-channel FET enables CCM operation under heavy load while supporting discontinuous conduction at light loads via adaptive half-current pulses.
It operates in two distinct power modes: bootstrapped (IC powered from VOUT, enabling 2.0V start-up and higher efficiency below 4V input) and non-bootstrapped (IC powered from V+, minimizing supply current but requiring external resistors for output setting). The LBI/LBO comparator uses 1.5V internal reference with 20mV hysteresis and supports programmable trip points via resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% (guaranteed over -40°C to +85°C); adjustable 5V–16.5V with external resistors |
| Max Output Current | 150mA at 12V with 5V input; derates per input voltage and thermal conditions |
| Supply Current | 110µA max (typ. 300µA at 5V), enabling >1000-hour battery life in low-duty-cycle flash programming |
| Shutdown Current | 5µA max (typ. 1µA), preserving battery during idle periods |
| Switching Frequency | Up to 300kHz - allows use of compact 18µH surface-mount inductors (e.g., Sumida CD54-180) |
| Input Voltage Range | 2.0V min start-up (bootstrapped mode), 2V–16.5V operating range - supports single-cell Li-ion, NiMH, and alkaline sources |
| Reference Voltage | 1.50V ±30mV (−40°C to +85°C), stable enough to set precise LBI trip points and feedback ratios |
Pinout & Package
MAX761EPA+ is housed in an 8-pin plastic DIP package (0.300" wide), rated for -40°C to +85°C operation. Pin numbering follows standard DIP top-view layout with pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBI | Low-battery comparator input | Accepts voltage divider from V+ to GND; triggers LBO when <1.5V (with 20mV hysteresis) |
| SHDN | Active-high shutdown control | TTL/CMOS-compatible; pulls internal bias off when high, reducing ICC to <5µA |
| V+ | Main power input / output sense node | In bootstrapped mode, also serves as output voltage feedback reference point |
| FB | Feedback input | Connected to GND for fixed 12V output; tied to resistor divider for adjustable output |
| REF | 1.5V precision reference output | Sources up to 100µA; requires ≥0.1µF ceramic bypass capacitor at pin |
| LX | Drain of internal N-channel power FET | Switching node with 1Ω on-resistance (typ.), 1A peak current limit, and 1.5A absolute max rating |
| GND | Analog/digital ground reference | Star-ground connection point for C1, C2, C4, and PCB return paths to minimize noise coupling |
| LBO | Open-drain low-battery output | Must be pulled up to V+ or VOUT via 100kΩ; floats high when LBI >1.5V, sinks when active |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables 86% efficiency from 1mA to 150mA load while maintaining <110µA quiescent current - eliminates need for separate PWM/PFM mode switching logic |
| Integrated 1A N-channel power FET | Eliminates external switch and gate driver; reduces BOM count and PCB area - supports full 150mA output with only 18µH inductor and 1N5817 Schottky diode |
| Bootstrapped operation mode | Allows reliable start-up from 2.0V input and improves efficiency below 4V by powering IC from regulated output - critical for single-cell battery systems |
| Low-battery detector with hysteresis | Provides system-level battery monitoring using internal 1.5V reference and 20mV hysteresis - avoids false triggers during transient load dips |
| 1.5V precision reference output | Stable ±30mV over temperature and line; usable for external ADC references or precision resistor-divider setting without additional voltage source |
Applications
| Flash Memory Programming | PCMCIA Card Power Supply |
|---|---|
Use Scenario: Erasing and programming NAND/NOR flash in portable test equipment or embedded programmers. IC Role / Device Role / Timing Role: Primary 12V high-current boost supply delivering 150mA pulses synchronized to flash command cycles. Use Value: Enables direct battery-powered flash programming without external charge pumps or transformers - reduces system cost and footprint by 40% vs. discrete solutions. |
Use Scenario: Providing regulated 12V to Type II PCMCIA cards in handheld data loggers or field diagnostic tools. IC Role / Device Role / Timing Role: Standby-ready boost converter with <5µA shutdown current, activated only during card insertion and configuration. Use Value: Extends single-AA battery life beyond 12 months in intermittent-use applications due to ultra-low IQ and fast wake-up (<100µs). |
| Battery-Powered Medical Sensors | Industrial Handheld Terminals |
Use Scenario: Powering 12V analog front-end circuits (e.g., photodiode transimpedance amps) in wearable glucose monitors. IC Role / Device Role / Timing Role: Always-on, low-noise boost stage with REF used as precision bias for sensor signal conditioning. Use Value: Maintains 12V rail stability within ±1% during 10–200mA dynamic loads - ensures consistent sensor gain and ADC accuracy across battery discharge curve. |
Use Scenario: Generating 12V for RS-232 transceivers and display backlight drivers in warehouse barcode scanners. IC Role / Device Role / Timing Role: Dual-function power IC: boost converter + low-battery monitor (LBI/LBO) feeding microcontroller's wake-up interrupt. Use Value: Integrates power conversion and battery health signaling in one 8-pin DIP - eliminates separate supervisor IC and saves 22mm² PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12V step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX761CSA+ | Same electrical specs, but in 8-pin SO package (0.150" wide); −40°C to +85°C rating matches MAX761EPA+ | SO package enables higher-density SMT assembly; lacks through-hole mounting option | Select MAX761CSA+ for automated PCB assembly where space and reflow compatibility are prioritized over manual prototyping or socketing. |
| TPS61040DRVR | 3.3V–5.5V input only; 28V max output; 0.5A switch; no integrated LBI/LBO or REF; 26µA IQ | Requires external battery monitor and reference; better suited for fixed-input, high-efficiency mid-power apps (e.g., OLED displays) | Choose TPS61040DRVR only if input is strictly 3.3V/5V and LBI/LBO/REF integration is unnecessary - not drop-in compatible with MAX761EPA+. |
Compared with MAX761CSA+, MAX761EPA+ offers through-hole reliability and thermal mass for lab/industrial environments; compared with TPS61040DRVR, it provides wider input range, integrated monitoring functions, and proven flash-programming drive capability - making it uniquely suitable for battery-powered programmable memory systems.
Availability
MAX761EPA+ is available at Aetrix Electronics and suitable for flash memory programming, PCMCIA card power, and battery-powered medical sensors requiring stable component supply, long-lifecycle support, and guaranteed -40°C to +85°C performance.
Supply support for MAX761EPA+ 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 - emphasizing high integration, low power, and rugged performance.
The MAX761EPA+ belongs to Maxim's legacy high-efficiency DC-DC converter family, engineered specifically for battery-constrained systems needing reliable 12V generation with minimal external components and built-in battery monitoring.
FAQ
What is the minimum input voltage required for MAX761EPA+ to start up?
The MAX761EPA+ achieves guaranteed start-up at 2.0V in bootstrapped mode (with internal feedback resistors), as confirmed in the Electrical Characteristics table and Typical Operating Characteristics Figure MAX761-07. This is enabled by dedicated start-up circuitry that fixes 50% duty cycle until V+ reaches 2.5V. In non-bootstrapped mode with external resistors, undervoltage lockout raises the effective start-up threshold to ~2.7V. The MAX761EPA+ datasheet specifies 2.0V as the absolute minimum start-up voltage under bootstrapped conditions.
Can MAX761EPA+ be used to generate an adjustable output voltage?
Yes, MAX761EPA+ supports adjustable output from 5V to 16.5V using external resistors R1 and R2 connected to FB and GND, as detailed in the Design Procedure section and Figure 5. The formula R2 = R1 × (VOUT − 1.5)/1.5 (with VREF = 1.5V) must be applied. Fixed 12V operation requires FB tied to GND only in bootstrapped mode; non-bootstrapped mode mandates external resistors for all output settings. MAX761EPA+ does not support fixed outputs in non-bootstrapped configuration.
How does the low-battery detection function work on MAX761EPA+?
The MAX761EPA+ integrates a precision low-battery comparator comparing LBI voltage to its internal 1.5V reference. When LBI falls below 1.5V, LBO (open-drain) pulls low - requiring an external pull-up resistor to V+ or VOUT. The comparator includes 20mV hysteresis to prevent chatter during battery sag. Trip voltage is set via resistor divider (R3/R4) between V+ and GND on LBI; MAX761EPA+ datasheet Figure 3 and Applications Information section provide exact calculation methods and layout guidance.
What is the purpose of the REF pin on MAX761EPA+?
The REF pin on MAX761EPA+ delivers a precision 1.50V ±30mV reference output capable of sourcing up to 100µA. It serves dual roles: (1) as the feedback reference for output voltage regulation when used with external resistors, and (2) as a stable bias source for external circuitry such as ADC references or comparator thresholds. The datasheet mandates a minimum 0.1µF ceramic capacitor directly at the REF pin to ensure stability and noise immunity - a requirement explicitly stated in the Pin Description and Design Procedure sections.
Does MAX761EPA+ support both bootstrapped and non-bootstrapped operation?
Yes, MAX761EPA+ supports both modes. Bootstrapped operation powers the IC from VOUT, enabling 2.0V start-up and higher efficiency below 4V input - ideal for single-cell battery systems. Non-bootstrapped operation powers the IC from V+, minimizing supply current but requiring external resistors for output setting and raising start-up voltage to ~2.7V. The MAX761EPA+ datasheet clearly distinguishes these configurations in Figures 2 (bootstrapped) and 3 (non-bootstrapped), with explicit guidance on trade-offs in the Detailed Description section.
MAX761EPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX761EPA+ FAQ
1.How can I place an order for MAX761EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX761EPA+ 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 MAX761EPA+ reliable?
The price and inventory of MAX761EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX761EPA+ is usually 5 days.
3.What payment methods are accepted for MAX761EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX761EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX761EPA+?
MAX761EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX761EPA+ 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 MAX761EPA+?
For technical support, including MAX761EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX761EPA+ requirements.
6.How does Aetrix verify that MAX761EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX761EPA+ 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 MAX761EPA+ meets industry standards.
7.What is the process for return or replacement of MAX761EPA+?
All MAX761EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX761EPA+, 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 MAX761EPA+ part is unused and in its original packaging.
Return procedure for MAX761EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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