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Analog Devices Inc./Maxim Integrated MAX757CSA+T
- Part No.:
- MAX757CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX757CSA+T.pdf
- Description:
- IC REG BOOST ADJ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,678
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Product details
Overview
MAX757CSA+T 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 via external feedback resistors, achieves >87% efficiency at 200mA, features 60µA quiescent current, and supports up to 500kHz switching frequency. It is used in glucose meters and portable data-collection equipment requiring compact, high-efficiency voltage boosting.
For engineers reviewing the MAX757CSA+T datasheet, MAX757CSA+T pinout, MAX757CSA+T application, or MAX757CSA+T equivalent, this page provides verified technical context, package mapping, real-world design meaning of key specs, and validated alternative options for adjustable boost converter selection.
Technical Context
The MAX757CSA+T integrates a 1A/0.5Ω N-channel power MOSFET, precision 1.25V reference (±1.5% over temperature), low-battery detector with LBI/LBO pins, and constant-off-time pulse-frequency modulation (PFM) control-no oscillator required. Its PFM architecture self-oscillates under load while maintaining ultra-low 20µA shutdown current.
It uses bootstrapped operation powered from the OUT pin, enabling start-up from as low as 0.7V and stable regulation even as input sags below 1V post-start. The FB pin accepts external resistor dividers to set output voltage per VOUT = 1.25V × (R1 + R2)/R2, with FB input bias ≤100nA ensuring accuracy with 10kΩ–200kΩ dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 2.7V to 5.5V, set precisely via external FB resistor divider-enables flexible system rail generation without changing IC. |
| Input Voltage Range (Start-Up) | 0.7V minimum, allowing direct operation from single alkaline, NiMH, or LiFePO₄ cells at end-of-life. |
| Efficiency | >87% at 200mA load, reducing thermal stress and extending battery life in portable medical and handheld devices. |
| Quiescent Current | 60µA typical in active mode, minimizing standby drain in always-on battery systems like glucose monitors. |
| Switching Frequency | Up to 500kHz, enabling use of small surface-mount inductors (<5mm diameter) and compact PCB layouts. |
| Reference Voltage | 1.25V ±1.5% over –40°C to +85°C, providing stable feedback for accurate output regulation across industrial temperature range. |
| Shutdown Current | 20µA with active reference and LBI detector enabled, preserving battery charge while retaining system monitoring capability. |
Pinout & Package
MAX757CSA+T is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body size, 1.27mm lead pitch, JEDEC MS-012AC compliant. GND (pin 7) must be soldered directly to a low-impedance ground plane to minimize noise and maximize efficiency.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Puts regulator in ultra-low 20µA state while keeping reference and LBI comparator operational-ideal for host-controlled sleep modes. |
| 2 FB | Feedback input | Connects to voltage divider between OUT and GND; sets output per VOUT = 1.25V × (R1 + R2)/R2-no internal DAC or trim required. |
| 3 REF | 1.25V precision reference output | Supplies 250µA max source / 20µA sink; remains active in shutdown-can drive ADC references or external comparators. |
| 4 LBO | Open-drain low-battery output | Sinks current when LBI falls below 1.25V; requires external pull-up to VOUT-enables system-level battery alert without extra IC. |
| 5 LBI | Low-battery input | Monitors input voltage via external resistor divider; threshold fixed at 1.25V-no calibration needed for consistent battery cutoff. |
| 6 OUT | Regulated output connection | Provides bootstrapped supply to internal circuitry and senses output voltage-must connect directly to output capacitor. |
| 7 GND | Power ground | Primary return path for switch current and feedback; requires low-inductance connection to ground plane to prevent instability. |
| 8 LX | Switch node | Drain of internal 1A/0.5Ω N-MOSFET; connects to inductor and Schottky diode-high dv/dt node requiring short, direct routing. |
Key Features
| Feature | Design Value |
|---|---|
| 0.7V start-up capability | Enables reliable operation from deeply discharged single-cell batteries-critical for long-life portable medical devices. |
| Constant-off-time PFM control | Eliminates fixed-frequency switching noise while maintaining high efficiency across 0.1mA–200mA loads-reduces EMI filtering burden. |
| Integrated 1.25V reference with 250µA drive | Supports direct interfacing to external ADCs or comparators without buffering-saves board space and BOM cost. |
| On-chip low-battery detection | Removes need for discrete voltage monitor IC; LBI/LBO pair works with two resistors to set precise cutoff-reduces component count by 3–4 parts. |
| Bootstrapped internal supply | Derives gate drive and bias from OUT pin-allows full functionality even when VIN drops below 1V after startup. |
Applications
| Glucose Meters | Portable Data Collectors |
|---|---|
|
Use Scenario: Battery-powered handheld device measuring blood glucose with LCD display and microcontroller requiring stable 3.3V or 5V rail. IC Role / Device Role / Timing Role: Step-up DC-DC converter generating regulated output from 1.8–3.0V battery input; provides clean, efficient power to analog front-end and digital logic. Use Value: 0.7V start-up ensures operation until battery reaches 0.9V, extending usable battery life by ~15% versus higher-VIN(min) alternatives. |
Use Scenario: Ruggedized field instrument collecting sensor data on 2-cell alkaline batteries, transmitting via RS-232 or Bluetooth. IC Role / Device Role / Timing Role: Adjustable boost regulator powering 5V USB interface and 3.3V MCU core; dynamically configured via firmware. Use Value: 60µA quiescent current minimizes self-discharge during idle periods, enabling multi-month shelf life without battery replacement. |
| Palmtop Computers | Medical Instrumentation |
|
Use Scenario: Compact computing device with flash memory, touchscreen controller, and backlight requiring multiple regulated rails. IC Role / Device Role / Timing Role: Primary boost converter supplying main system voltage; coordinated with LBO signal to trigger low-power warning before shutdown. Use Value: Integrated LBI/LBO eliminates need for separate supervisor IC-reducing solution size by 25% and bill-of-materials complexity. |
Use Scenario: Portable diagnostic tool (e.g., pulse oximeter) operating from coin cell or AAA batteries with strict EMC and reliability requirements. IC Role / Device Role / Timing Role: High-efficiency boost stage powering analog signal chain and low-noise ADC reference; PFM architecture avoids fixed-frequency interference. Use Value: >87% efficiency at 200mA reduces thermal rise in sealed enclosures, meeting IEC 60601-1 patient-accessible temperature limits. |
Availability
MAX757CSA+T is available at Aetrix Electronics and suitable for glucose meters, portable data collectors, and palmtop computers requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX757CSA+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, medical, and consumer applications.
The MAX756/MAX757 product line was engineered specifically for ultra-low-voltage, battery-critical portable systems-prioritizing start-up margin, quiescent power, and integration to minimize external components.
FAQ
What is the minimum input voltage required for MAX757CSA+T to start up?
The MAX757CSA+T starts up from as low as 0.7V input, verified across temperature and process corners. This enables reliable operation from a single NiMH or alkaline cell at end-of-discharge. Once started, it continues regulating even if input sags below 1V due to its bootstrapped architecture-confirmed in Figure 1 and Typical Operating Characteristics section of the datasheet.
How do I set the output voltage for MAX757CSA+T?
Set the output voltage of MAX757CSA+T using two external resistors (R1 and R2) forming a divider from OUT to GND, connected to the FB pin. Use VOUT = 1.25V × (R1 + R2)/R2. For example, 10kΩ (R2) and 22kΩ (R1) yield 3.6V. FB input bias is ≤100nA, so resistor values from 10kΩ to 200kΩ maintain accuracy without loading error.
Does MAX757CSA+T include a low-battery detection function?
Yes, MAX757CSA+T integrates a precision low-battery detector with a fixed 1.25V threshold on the LBI pin and open-drain LBO output. Connect LBI to VIN via a resistor divider to set the detection point (e.g., 2.5V → R3/R4 = 1:1). LBO sinks current when triggered and remains functional in shutdown mode-no external comparator needed.
What is the switching frequency behavior of MAX757CSA+T?
MAX757CSA+T uses constant-off-time pulse-frequency modulation (PFM), not fixed-frequency PWM. Switching frequency varies with load and input voltage-from ~100kHz at light loads to 500kHz maximum under heavy load. This eliminates beat frequencies and reduces EMI filtering requirements compared to fixed-frequency converters.
Can MAX757CSA+T operate in shutdown mode while retaining reference functionality?
Yes, MAX757CSA+T draws only 20µA in shutdown (SHDN = low) while keeping the 1.25V REF output active and the LBI comparator functional. This allows external circuits to monitor battery status or provide wake-up signals without waking the entire system-verified in Electrical Characteristics table (Shutdown Quiescent Current row).
MAX757CSA+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:
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX757CSA+T FAQ
1.How can I place an order for MAX757CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX757CSA+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 MAX757CSA+T reliable?
The price and inventory of MAX757CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX757CSA+T is usually 5 days.
3.What payment methods are accepted for MAX757CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX757CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX757CSA+T?
MAX757CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX757CSA+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 MAX757CSA+T?
For technical support, including MAX757CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX757CSA+T requirements.
6.How does Aetrix verify that MAX757CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX757CSA+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 MAX757CSA+T meets industry standards.
7.What is the process for return or replacement of MAX757CSA+T?
All MAX757CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX757CSA+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 MAX757CSA+T part is unused and in its original packaging.
Return procedure for MAX757CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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