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Analog Devices Inc./Maxim Integrated MAX756ESA+T
- Part No.:
- MAX756ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX756ESA+T.pdf
- Description:
- IC REG BOOST PROG 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,076
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Product details
Overview
MAX756ESA+T 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 with up to 300mA at 3.3V or 200mA at 5V, 87% typical efficiency, and 60µA quiescent current - used in glucose meters, palmtop computers, and portable data-collection equipment.
For engineers reviewing the MAX756ESA+T datasheet, MAX756ESA+T pinout, MAX756ESA+T application, or MAX756ESA+T equivalent, key selection considerations include input start-up voltage (as low as 0.7V), shutdown mode current (20µA), ±1.5% reference tolerance, 500kHz max switching frequency, and integrated low-battery detection with LBI/LBO pins.
Technical Context
The MAX756ESA+T implements a constant-off-time pulse-frequency modulation (PFM) control scheme without an oscillator, enabling ultra-low quiescent current while maintaining high efficiency across load ranges. Its internal 1A/0.5Ω N-channel MOSFET switch operates with self-oscillating current limiting under heavy loads and fixed minimum off-time (1µs) under light loads.
It integrates a precision 1.25V reference (±1.5% over temperature), active low-battery comparator (1.25V threshold), and bootstrapped power supply derived from the OUT pin - all functional during shutdown. The 3/5 pin selects fixed 3.3V (high) or 5V (low) output without external feedback components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.7V min start-up; 2V–VOUT operating range - enables operation from single-cell alkaline or NiMH batteries near end-of-life. |
| Output Voltage | Pin-selectable 3.3V (±3%) or 5V (±4%) - no external resistors required; set by logic level on 3/5 pin. |
| Max Output Current | 300mA @ 3.3V / 200mA @ 5V - limited by internal 1A peak switch current and thermal dissipation in SO package. |
| Efficiency | 87% typical at full load - achieved via CMOS process, low-RDS(on) switch, and optimized PFM architecture. |
| Quiescent Current | 60µA in operation; 20µA in shutdown - preserves battery life in standby without disabling reference or LBI detector. |
| Switching Frequency | Up to 500kHz - allows use of compact <5mm surface-mount inductors and reduces output ripple filtering requirements. |
| Reference Voltage | 1.25V ±1.5% over –40°C to +85°C - stable enough to drive external ADCs or serve as system reference. |
Pinout & Package
MAX756ESA+T is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, 150 mil body width, with exposed pad not present. Pin 7 (GND) must be soldered directly to a low-impedance ground plane to minimize noise and maximize thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Shutdown control input | Active-low logic input; disables SMPS but keeps reference and LBI comparator active - enables fast wake-up with no re-start delay. |
| 2 - 3/5 | Output voltage select | Logic-high = 3.3V output; logic-low = 5V output - eliminates need for external resistor dividers or configuration jumpers. |
| 3 - REF | Precision voltage reference output | 1.25V ±1.5%, 250µA source capability - usable as system reference; requires 0.22µF bypass if loaded. |
| 4 - LBO | Low-battery open-drain output | Sinks current when LBI < 1.25V; requires external pull-up to VOUT - signals battery depletion to host microcontroller. |
| 5 - LBI | Low-battery input sense | Compares VIN-derived voltage against internal 1.25V reference - connect to voltage divider from input rail for programmable threshold. |
| 6 - OUT | Regulated output and bootstrap supply | Delivers regulated 3.3V/5V; also powers internal circuitry - must be connected before startup and decoupled with ≥100µF capacitor. |
| 7 - GND | Power ground | Main return path for switch current and load; requires direct low-inductance connection to ground plane - critical for EMI and thermal performance. |
| 8 - LX | Switch node | Drain of internal 1A N-MOSFET; connects to inductor and Schottky diode - high dv/dt node requiring short, direct routing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low start-up voltage | 0.7V minimum - enables use with deeply discharged single-cell batteries in medical and portable devices. |
| Integrated low-battery detection | Dedicated LBI/LBO pins with 1.25V threshold - eliminates external comparator and reduces BOM count in battery-operated systems. |
| Bootstrapped internal supply | Powered from OUT pin - removes need for auxiliary bias supply and simplifies layout in space-constrained designs. |
| CMOS PFM control architecture | 60µA operating / 20µA shutdown current - extends battery runtime significantly versus bipolar-based regulators. |
| Fixed-output flexibility | No external feedback resistors required for 3.3V/5V modes - reduces design complexity and improves production yield. |
Applications
| Glucose Meters | Palmtop Computers |
|---|---|
Use Scenario: Portable handheld device measuring blood glucose using electrochemical sensor requiring stable 3.3V MCU and analog front-end supply from 2-cell alkaline battery. IC Role / Device Role / Timing Role: Step-up regulator providing regulated 3.3V output and low-battery warning signal to microcontroller via LBO pin. Use Value: Enables reliable operation down to 0.7V input, extending usable battery life by >25% compared to higher-VIN(min) alternatives. |
Use Scenario: Compact computing platform powered by 2–3 NiMH cells, requiring clean 5V rail for display backlight and 3.3V for CPU core. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering dual fixed outputs; 3/5 pin toggled dynamically to optimize efficiency per subsystem load. Use Value: Eliminates need for separate 3.3V/5V regulators, reducing board area by 40% and component count by 3 parts. |
| Portable Data-Collection Terminals | Medical Instrumentation |
Use Scenario: Rugged handheld scanner capturing barcodes and transmitting via Bluetooth, powered by replaceable AA batteries. IC Role / Device Role / Timing Role: Main power supply generating 3.3V for BLE SoC and 5V for laser driver; LBI monitors battery health during field use. Use Value: 87% efficiency at 200mA ensures >10 hours runtime; 20µA shutdown current prevents battery drain during storage. |
Use Scenario: Battery-backed patient monitor with LCD, ECG front-end, and wireless telemetry operating in clinical environments. IC Role / Device Role / Timing Role: Critical power converter supplying isolated 3.3V domain; maintains reference and LBI functionality during shutdown for rapid wake-up. Use Value: –40°C to +85°C industrial temp grade (ESA) ensures reliability across hospital, ambulance, and home-use conditions. |
Availability
MAX756ESA+T is available at Aetrix Electronics and suitable for glucose meters, palmtop computers, and portable data-collection terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX756ESA+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 is a U.S.-based semiconductor company specializing in analog and mixed-signal ICs for power management, interface, sensing, and security applications.
The MAX756ESA+T belongs to Maxim's legacy high-efficiency DC-DC converter product line, engineered specifically for ultra-low-voltage battery-powered instrumentation where start-up voltage, quiescent current, and integration are critical.
FAQ
What is the minimum input voltage required for MAX756ESA+T to start up?
The MAX756ESA+T starts up from as low as 0.7V input - verified across –40°C to +85°C - making it suitable for single-cell alkaline or NiMH batteries nearing end-of-life. Once started, it continues regulating down to lower voltages depending on load and output setting. This start-up specification is guaranteed and tested per Maxim's datasheet Figure 1 and Electrical Characteristics table.
Does MAX756ESA+T require external feedback resistors for 3.3V or 5V output?
No, the MAX756ESA+T does not require external feedback resistors for its fixed 3.3V or 5V outputs. Output voltage is selected solely by the logic level applied to the 3/5 pin: high = 3.3V, low = 5V. This internal selection eliminates resistor matching errors, layout sensitivity, and BOM overhead - a key differentiator from adjustable regulators like the MAX757.
How does the low-battery detection function work on MAX756ESA+T?
The MAX756ESA+T uses dedicated LBI and LBO pins for low-battery detection: LBI compares an external voltage divider from VIN against an internal 1.25V reference; when LBI drops below that threshold, LBO (open-drain) sinks current. The comparator remains active even in shutdown mode - allowing continuous battery monitoring without waking the main system.
What package type and footprint does MAX756ESA+T use?
The MAX756ESA+T is supplied in an 8-pin SO (Small Outline) package per JEDEC MS-012, with 150 mil body width and 1.27mm lead pitch. It has no exposed thermal pad. The pinout matches industry-standard 8-SO layouts, and the GND pin (pin 7) must be soldered directly to a solid ground plane to ensure thermal stability and low-noise operation.
Can MAX756ESA+T operate in shutdown mode while retaining reference and LBI functionality?
Yes, MAX756ESA+T maintains its 1.25V reference and low-battery comparator fully operational during shutdown - confirmed in the datasheet's "Features" and "Detailed Description" sections. When SHDN is pulled low, the SMPS stops switching, but REF continues sourcing up to 250µA and LBI/LBO remain active, enabling real-time battery monitoring with only 20µA total supply current.
MAX756ESA+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:
- 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+T FAQ
1.How can I place an order for MAX756ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX756ESA+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 MAX756ESA+T reliable?
The price and inventory of MAX756ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX756ESA+T is usually 5 days.
3.What payment methods are accepted for MAX756ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX756ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX756ESA+T?
MAX756ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX756ESA+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 MAX756ESA+T?
For technical support, including MAX756ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX756ESA+T requirements.
6.How does Aetrix verify that MAX756ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX756ESA+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 MAX756ESA+T meets industry standards.
7.What is the process for return or replacement of MAX756ESA+T?
All MAX756ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX756ESA+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 MAX756ESA+T part is unused and in its original packaging.
Return procedure for MAX756ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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