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Analog Devices Inc./Maxim Integrated MAX756ESA+
- Part No.:
- MAX756ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX756ESA+.pdf
- Description:
- IC REG BOOST PROG 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,692
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Product details
Overview
MAX756ESA+ from Maxim Integrated is a CMOS step-up DC-DC switching regulator designed for low-input-voltage, battery-powered systems. It accepts input down to 0.7V and delivers pin-selectable 3.3V or 5V output at up to 300mA (5V mode) or 200mA (3.3V mode), with 87% typical full-load efficiency and 60µA quiescent current. It integrates an N-channel MOSFET, precision 1.25V reference, and low-battery detector (LBI/LBO), targeting portable medical devices and data collectors.
For engineers reviewing the MAX756ESA+ datasheet, MAX756ESA+ pinout, MAX756ESA+ application, or MAX756ESA+ equivalent, key selection criteria include minimum start-up voltage (0.7V), output voltage selectability via the 3/5 pin, shutdown quiescent current (20µA), and SO-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX756ESA+ employs a constant-off-time pulse-frequency modulation (PFM) control scheme with no oscillator, enabling ultra-low quiescent current and variable switching frequency up to 500kHz. Its internal 1A, 0.5Ω N-channel power MOSFET supports high-efficiency boost conversion without external switch components.
It features a bootstrapped architecture powered from the OUT pin, allowing operation even as input voltage sags below 1V after startup. The integrated 1.25V reference remains active in shutdown mode and drives external circuitry with ±1.5% tolerance over temperature, while the LBI/LBO comparator provides programmable low-battery detection independent of regulation mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.7V min start-up; 0.7V to VOUT–VD operating (VD = Schottky forward drop); enables single-cell alkaline or NiMH operation. |
| Output Voltage | PIN-selectable 3.3V (±3%) or 5V (±4%) - set by logic level on 3/5 pin; no external feedback resistors required. |
| Max Output Current | 300mA at 5V output (VIN ≥ 2V); 200mA at 3.3V output (VIN ≥ 2V); limited by internal 1A peak switch current. |
| Efficiency | 87% typical at full load (200mA/3.3V or 200mA/5V); achieved via low-RDS(on) MOSFET and PFM control minimizing light-load losses. |
| Quiescent Current | 60µA in active mode; 20µA in shutdown - preserves battery life in standby without disabling reference or LBI detection. |
| Switching Frequency | Up to 500kHz - enables use of compact <5mm surface-mount inductors (e.g., 22µH) and reduces output ripple filtering area. |
| Reference Voltage | 1.25V ±1.5% over –40°C to +85°C - stable enough to drive ADC references or external comparators directly. |
Pinout & Package
MAX756ESA+ is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, with 1.27mm pitch, 4.9mm × 3.9mm body, and exposed pad not connected internally. Pin 7 (GND) must be soldered directly to a low-impedance ground plane for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Shutdown control input | Active-low logic input; disables SMPS but keeps REF and LBI comparator operational - enables system-level power sequencing. |
| 2 - 3/5 | Output voltage select | Logic-high = 3.3V output; logic-low = 5V output - eliminates need for external resistor networks or firmware configuration. |
| 3 - REF | 1.25V precision reference output | Supplies 250µA max source / 20µA sink; bypass with 0.22µF if loaded - usable as ADC reference or comparator threshold source. |
| 4 - LBO | Low-battery open-drain output | Sinks current when LBI < 1.25V; requires external pull-up to VOUT - signals battery depletion without additional ICs. |
| 5 - LBI | Low-battery input sense | Monitors input voltage via external resistor divider; threshold fixed at 1.25V - allows programmable cutoff (e.g., 0.9V–2.4V VIN). |
| 6 - OUT | Regulated output & bootstrap supply | Delivers regulated 3.3V/5V; also powers internal circuitry - eliminates need for auxiliary bias supply. |
| 7 - GND | Power ground | Must connect directly to PCB ground plane - critical for EMI suppression, thermal dissipation, and stable regulation. |
| 8 - LX | Switch node | Drives external inductor and Schottky diode (e.g., 1N5817); handles 1A peak current - requires short, low-inductance trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low start-up voltage | 0.7V minimum enables use with nearly depleted single-cell batteries - extends usable runtime in portable instruments. |
| Integrated low-battery detection | LBI/LBO pins provide fully self-contained battery monitoring with 1.25V threshold - removes need for external supervisor IC. |
| Bootstrapped internal supply | OUT pin powers internal circuitry - eliminates separate VCC rail and simplifies BOM for space-constrained designs. |
| CMOS PFM control architecture | 60µA active quiescent current and 20µA shutdown - achieves >10× lower supply current than bipolar-based regulators. |
| High-efficiency monolithic switch | 1A, 0.5Ω internal N-MOSFET - reduces component count and PCB area vs. controller + external FET solutions. |
Applications
| Glucose Meters | Palmtop Computers |
|---|---|
Use Scenario: Portable handheld device measuring blood glucose using electrochemical test strips requiring stable 3.3V or 5V rail from 1.5V alkaline cell. IC Role / Device Role / Timing Role: Step-up DC-DC converter providing regulated output and integrated low-battery warning to prevent erroneous readings. Use Value: 0.7V start-up ensures operation until battery reaches ~0.9V; 87% efficiency maximizes battery life between calibrations. |
Use Scenario: Compact computing platform powered by two AA cells needing clean 3.3V for microcontroller and 5V for peripheral interfaces. IC Role / Device Role / Timing Role: Dual-output-capable boost regulator with pin-selectable voltage and shutdown control for system power management. Use Value: Single IC replaces discrete boost + supervisor solution; SO-8 footprint fits tight layout constraints of clamshell form factor. |
| Portable Data-Collection Equipment | Medical Instrumentation |
Use Scenario: Rugged handheld scanner reading barcodes or RFID tags in field environments, powered by 2-cell NiMH pack. IC Role / Device Role / Timing Role: Primary power converter delivering 5V to imaging sensor and 3.3V to MCU, with LBO-driven LED alert for low battery. Use Value: 500kHz switching allows small 22µH inductor; 20µA shutdown current preserves charge during overnight storage. |
Use Scenario: Battery-operated patient monitor requiring reliable 3.3V for analog front-end and digital logic, with fail-safe battery monitoring. IC Role / Device Role / Timing Role: Safety-critical boost regulator with always-active LBI comparator and reference - maintains detection capability even in shutdown. Use Value: ±1.5% reference tolerance ensures accurate ADC measurements; -40°C to +85°C rating supports clinical environment operation. |
Availability
MAX756ESA+ is available at Aetrix Electronics and suitable for portable medical instrumentation, handheld data-collection terminals, and palmtop computing platforms requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX756ESA+ 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) is a U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for power, interface, sensing, and timing applications.
The MAX756ESA+ belongs to Maxim's legacy low-voltage DC-DC converter product line, engineered specifically for battery-powered portable equipment where minimal start-up voltage, high light-load efficiency, and integrated supervision are critical.
FAQ
What is the minimum input voltage required for the MAX756ESA+ to start up?
The MAX756ESA+ starts up from as low as 0.7V input voltage under typical conditions, enabling operation with nearly depleted single-cell alkaline or NiMH batteries. This specification is verified across the full –40°C to +85°C operating range and is independent of output voltage selection (3.3V or 5V mode). Once started, the device continues regulating down to ~0.9V input due to its bootstrapped architecture powered from the OUT pin.
How does the MAX756ESA+ select between 3.3V and 5V output voltages?
The MAX756ESA+ selects output voltage via the logic level applied to pin 2 (3/5): a logic-high signal (≥1.8V) configures the device for 3.3V output, while a logic-low signal (≤0.4V) sets it to 5V output. This selection is implemented entirely within the IC and requires no external resistors or configuration registers. The MAX756ESA+ datasheet specifies ±3% tolerance for 3.3V mode and ±4% for 5V mode at full load.
Does the MAX756ESA+ include a low-battery detection feature, and how is it configured?
Yes, the MAX756ESA+ integrates a low-battery detector with dedicated LBI (pin 5) and LBO (pin 4) terminals. LBI senses input voltage through an external resistor divider; when the divided voltage falls below the internal 1.25V reference, LBO sinks current to indicate low battery. The comparator and reference remain active even in shutdown mode, ensuring continuous monitoring. No additional ICs or firmware are needed to implement this function in the MAX756ESA+ design.
What package type and footprint does the MAX756ESA+ use?
The MAX756ESA+ is supplied in an 8-pin SO (Small Outline) package conforming to JEDEC MS-012, with 1.27mm lead pitch, 4.9mm × 3.9mm body dimensions, and a maximum height of 1.75mm. Its pinout matches industry-standard SO-8 footprints, and pin 7 (GND) must be soldered directly to a solid ground plane to ensure thermal stability and low-noise operation. The "ESA" suffix explicitly denotes this SO-8 variant rated for –40°C to +85°C.
Can the MAX756ESA+ operate with a 1.5V alkaline battery, and what output current is supported?
Yes, the MAX756ESA+ operates reliably from a single 1.5V alkaline cell: its 0.7V start-up voltage and ability to sustain regulation down to ~0.9V enable full functionality across the battery's discharge curve. At 1.5V input, it delivers up to 300mA at 5V output or 200mA at 3.3V output, as confirmed in the Typical Operating Characteristics graphs and Electrical Characteristics table of the MAX756ESA+ datasheet.
MAX756ESA+ 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
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.7V
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 3.3V, 5V
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX756ESA+ FAQ
1.How can I place an order for MAX756ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX756ESA+ 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 MAX756ESA+ reliable?
The price and inventory of MAX756ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX756ESA+ is usually 5 days.
3.What payment methods are accepted for MAX756ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX756ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX756ESA+?
MAX756ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX756ESA+ 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 MAX756ESA+?
For technical support, including MAX756ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX756ESA+ requirements.
6.How does Aetrix verify that MAX756ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX756ESA+ 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 MAX756ESA+ meets industry standards.
7.What is the process for return or replacement of MAX756ESA+?
All MAX756ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX756ESA+, 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 MAX756ESA+ part is unused and in its original packaging.
Return procedure for MAX756ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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