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Analog Devices Inc./Maxim Integrated MAX757ESA+
- Part No.:
- MAX757ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX757ESA+.pdf
- Description:
- IC REG BOOST ADJ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,968
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Product details
Overview
MAX757ESA+ from Maxim Integrated is an adjustable-output, CMOS step-up DC-DC switching regulator designed for low-input-voltage battery-powered systems. It operates down to 0.7V input, delivers 2.7V–5.5V output (set via external feedback resistors), achieves >87% efficiency at 200mA, features 60µA quiescent current, and integrates a low-battery detector with LBI/LBO pins. It is used in glucose meters and portable medical instrumentation where compact size and ultra-low startup voltage are critical.
For engineers reviewing the MAX757ESA+ datasheet, MAX757ESA+ pinout, MAX757ESA+ application, or MAX757ESA+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply support details specific to the MAX757ESA+ SO-8 package variant.
Technical Context
The MAX757ESA+ implements a constant-off-time pulse-frequency modulation (PFM) control scheme with no oscillator-switching frequency varies from ~100kHz to 500kHz depending on load and input voltage. Its internal 1A/0.5Ω N-channel MOSFET power switch enables high-efficiency boost conversion without external gate drivers.
It integrates a precision 1.25V reference (±1.5% over temperature), active low-battery detection (1.25V threshold with 25mV hysteresis), and shutdown mode retaining reference and LBI functionality. The FB pin accepts external resistor dividers for precise output setting, while REF supplies up to 250µA source current for external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 2.7V to 5.5V - set by external R1/R2 divider on FB pin; supports flexible system rail generation |
| Min Startup Input Voltage | 0.7V - enables operation from deeply discharged single-cell alkaline or NiMH batteries |
| Quiescent Current | 60µA - minimizes standby drain in always-on portable devices like glucose meters |
| Switching Frequency | Up to 500kHz - allows use of small surface-mount inductors (<5mm diameter) |
| Reference Voltage | 1.25V ±1.5% - stable, temperature-compensated reference usable for ADC bias or external regulation |
| LBI Threshold | 1.25V with 25mV hysteresis - enables reliable low-battery warning without external comparators |
| Efficiency | >87% at 200mA - reduces thermal load and extends battery life in 2–3 cell equipment |
| Shutdown Current | 20µA - preserves battery during sleep modes while keeping reference and LBI active |
Pinout & Package
MAX757ESA+ is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, with 1.27mm pitch, body dimensions 4.9mm × 3.9mm × 1.75mm max, and GND pin (7) requiring direct soldering to ground plane for optimal EMI and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Shutdown control input | Active-low logic input; disables SMPS but keeps REF and LBI functional - enables system-level power sequencing |
| 2 FB | Feedback input | Connects to voltage divider between OUT and GND; sets output via VOUT = 1.25V × (R1+R2)/R2 - enables precise adjustable regulation |
| 3 REF | 1.25V reference output | Supplies up to 250µA; bypassed with 0.22µF if loaded - powers external analog circuitry without additional references |
| 4 LBO | Low-battery open-drain output | Sinks current when LBI < 1.25V; requires external pull-up to VOUT - drives microcontroller interrupt or LED indicator |
| 5 LBI | Low-battery input | Monitors input voltage via resistor divider; threshold fixed at 1.25V - eliminates need for discrete voltage monitor IC |
| 6 OUT | Regulated output | Delivers boosted DC voltage; also bootstraps internal circuitry - must connect directly to output capacitor with minimal trace length |
| 7 GND | Power ground | Low-impedance return path; must be soldered directly to ground plane - critical for stability, efficiency, and EMI control |
| 8 LX | Switch node | Drain of internal 1A/0.5Ω N-MOSFET; connects to inductor and Schottky diode - high di/dt node requiring shortest possible layout |
Key Features
| Feature | Design Value |
|---|---|
| 0.7V minimum start-up voltage | Enables reliable operation from single-cell alkaline/NiMH batteries even below 1.0V under load |
| 60µA quiescent supply current | Extends shelf life and runtime in intermittently powered devices such as handheld diagnostics |
| Integrated 1.25V reference with 250µA drive | Eliminates external reference IC in systems needing precision bias for sensors or ADCs |
| On-chip low-battery comparator with LBI/LBO | Reduces BOM count and PCB area by replacing discrete voltage monitor + comparator + reference |
| Constant-off-time PFM control | Maintains high efficiency (>80%) across 10µA–200mA load range without switching noise spikes |
| SO-8 package with exposed pad option | Supports automated assembly and offers thermal performance suitable for sealed medical enclosures |
Applications
| Glucose Meters | Portable Data Collectors |
|---|---|
Use Scenario: Battery-powered handheld device measuring blood glucose concentration with LCD display and Bluetooth connectivity. IC Role / Device Role / Timing Role: Primary step-up regulator generating stable 3.3V rail from 1.5–2.4V alkaline battery stack. Use Value: 0.7V startup ensures full functionality even with weak batteries; 60µA quiescent current extends calibration interval and shelf life. | Use Scenario: Ruggedized field instrument capturing sensor data, storing logs, and transmitting via RS-232 or USB. IC Role / Device Role / Timing Role: Adjustable boost converter powering 5V logic and interface circuits from 2-cell NiMH pack. Use Value: FB-based output flexibility supports multiple peripheral voltages; integrated LBI/LBO replaces discrete battery monitor IC. |
| Palmtop Computers | Medical Instrumentation |
Use Scenario: Compact PDA-style device with touch screen, flash memory, and real-time OS requiring clean 3.3V core and 5V I/O rails. IC Role / Device Role / Timing Role: Dual-rail generator using two MAX757ESA+ units-one for 3.3V core, one for 5V peripherals. Use Value: 500kHz switching enables miniature 22µH inductors; SO-8 footprint fits tight board space constraints. | Use Scenario: Portable ECG or pulse oximeter operating from coin-cell or AAA batteries with strict EMC and reliability requirements. IC Role / Device Role / Timing Role: Single-rail boost converter powering analog front-end and microcontroller from 1.2–2.0V input. Use Value: -40°C to +85°C industrial temp grade (ESA) ensures clinical-grade reliability; REF pin powers precision op-amp bias networks. |
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 |
|---|---|---|---|
| TPS61040DRBT | Fixed 5V output only; 0.9V min input; 500kHz fixed-frequency PWM; 28µA quiescent current | Lacks adjustable output and integrated low-battery detection; requires external comparator for battery monitoring | Select when fixed 5V output suffices and lowest quiescent current is prioritized over flexibility |
| LT1930ES5#TRMPBF | Adjustable output (1.25–15V); 0.7V min input; 1.2MHz fixed-frequency PWM; 100µA quiescent current | Higher switching frequency enables smaller magnetics but higher EMI; no integrated LBI/LBO or REF output | Select when higher output voltage range and faster transient response are needed, accepting added external components |
Compared with MAX757ESA+, TPS61040DRBT offers lower quiescent current but sacrifices output adjustability and battery monitoring integration, while LT1930ES5#TRMPBF extends output range and speed at the cost of higher idle consumption and missing reference/monitoring functions-making MAX757ESA+ optimal for space-constrained, battery-sensitive medical and portable instrumentation.
Availability
MAX757ESA+ is available at Aetrix Electronics and suitable for glucose meters, portable data collectors, and palmtop computers requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX757ESA+ 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 MAX757ESA+ belongs to Maxim's legacy high-efficiency boost converter product line, engineered specifically for ultra-low-voltage battery operation in portable medical and handheld instrumentation.
FAQ
What is the minimum input voltage required for the MAX757ESA+ to start up?
The MAX757ESA+ starts up from as low as 0.7V input voltage, enabling operation from nearly depleted single-cell alkaline or NiMH batteries. This specification is guaranteed across the full -40°C to +85°C operating temperature range and is independent of output voltage setting. Once started, the MAX757ESA+ continues regulating down to lower input levels due to its bootstrap architecture, making it ideal for battery-gauging and low-power medical devices.
How is the output voltage set on the MAX757ESA+?
The output voltage of the MAX757ESA+ is set externally using two resistors (R1 and R2) connected between OUT, FB, and GND. The formula is VOUT = 1.25V × (R1 + R2) / R2. Typical values range from 10kΩ to 200kΩ to minimize loading error from FB's ≤100nA input bias current. Unlike the pin-selectable MAX756, the MAX757ESA+ requires this feedback network for all output configurations, including 3.3V and 5V.
Does the MAX757ESA+ include a low-battery detection feature?
Yes, the MAX757ESA+ integrates a precision low-battery detector with a fixed 1.25V threshold on the LBI pin and an open-drain LBO output. When LBI falls below 1.25V, LBO sinks current to signal low battery condition. The detector remains active during shutdown mode, and its 25mV hysteresis prevents chatter. No external comparator or reference is needed-only two resistors (R3, R4) form the input divider from VIN to LBI.
What package type and temperature range does the MAX757ESA+ use?
The MAX757ESA+ uses an 8-pin SO (Small Outline) package per JEDEC MS-012, with 1.27mm lead pitch and body size 4.9mm × 3.9mm. It is rated for industrial temperature operation from -40°C to +85°C, as indicated by the "ESA" suffix. This makes it suitable for demanding environments such as portable medical equipment and field-deployed instrumentation where extended thermal reliability is required.
Can the MAX757ESA+ operate without an external Schottky diode?
No-the MAX757ESA+ requires an external Schottky diode (e.g., 1N5817) connected between LX and OUT to complete the boost converter topology. The IC contains only the N-channel MOSFET switch and control circuitry; it does not integrate a synchronous rectifier. Using a Schottky diode minimizes forward voltage drop and conduction loss, preserving the >87% efficiency claim. Substituting a standard PN diode degrades efficiency significantly due to higher VF.
MAX757ESA+ 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.7V
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 5.5V
- 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
MAX757ESA+ FAQ
1.How can I place an order for MAX757ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX757ESA+ 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 MAX757ESA+ reliable?
The price and inventory of MAX757ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX757ESA+ is usually 5 days.
3.What payment methods are accepted for MAX757ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX757ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX757ESA+?
MAX757ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX757ESA+ 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 MAX757ESA+?
For technical support, including MAX757ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX757ESA+ requirements.
6.How does Aetrix verify that MAX757ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX757ESA+ 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 MAX757ESA+ meets industry standards.
7.What is the process for return or replacement of MAX757ESA+?
All MAX757ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX757ESA+, 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 MAX757ESA+ part is unused and in its original packaging.
Return procedure for MAX757ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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