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Analog Devices Inc./Maxim Integrated MAX756CSA+T
- Part No.:
- MAX756CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX756CSA+T.pdf
- Description:
- IC REG BOOST PROG 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,379
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Product details
Overview
MAX756CSA+T from Maxim Integrated is a CMOS step-up DC-DC switching regulator in 8-pin SO package, designed for low-input-voltage battery-powered systems. It accepts input as low as 0.7V and delivers pin-selectable 3.3V or 5V output with up to 300mA at 3.3V / 200mA at 5V, 87% typical efficiency, and 60µA quiescent current - used in glucose meters and portable data collectors.
For engineers reviewing the MAX756CSA+T datasheet, MAX756CSA+T pinout, MAX756CSA+T application, or MAX756CSA+T equivalent, key selection criteria include minimum start-up voltage (0.7V), output voltage selectability via 3/5 pin, integrated low-battery detector (LBI/LBO), shutdown mode quiescent current (20µA), and SO-8 thermal performance (471mW at +70°C).
Technical Context
The MAX756CSA+T implements a constant-off-time pulse-frequency modulation (PFM) control scheme with no external oscillator, enabling variable switching frequency up to 500kHz and ultra-low quiescent current. Its internal 1A, 0.5Ω N-channel MOSFET power switch features low gate threshold for reliable start-up under deep battery discharge.
It integrates a precision 1.25V reference (±1.5% over temperature), active low-battery comparator with open-drain LBO output, and bootstrapped operation powered from OUT - eliminating need for auxiliary supply while supporting output voltages exceeding input during regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.7V min start-up; 0.7V–3V operating - enables single-cell alkaline or NiMH operation down to end-of-life. |
| 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 @ 3.3V / 200mA @ 5V - limited by internal 1A peak switch current and thermal dissipation in SO-8 package. |
| Efficiency | 87% typical @ full load - achieved via CMOS design, low-RDS(on) switch, and PFM architecture minimizing light-load losses. |
| Quiescent Current | 60µA active mode; 20µA shutdown - preserves battery life in standby without disabling reference or LBI detection. |
| Switching Frequency | Up to 500kHz - enables use of compact 22µH surface-mount inductors (<5mm diameter) and reduces output ripple. |
| Reference Voltage | 1.25V ±1.5% over –40°C to +85°C - stable enough to drive external ADCs or comparators without additional buffering. |
Pinout & Package
MAX756CSA+T is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, 3.9mm × 4.9mm body, 1.75mm max height, with 1.27mm pitch. GND (pin 7) must be soldered directly to PCB ground plane for optimal thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SHDN | Active-low shutdown control | Disables SMPS but keeps reference and LBI comparator active; logic-compatible with 3.3V/5V systems. |
| 2: 3/5 | Output voltage select | Low = 5V output; high = 3.3V output; internal pull-down ensures default 5V if left unconnected. |
| 3: REF | 1.25V precision reference output | Supplies up to 250µA; bypass with 0.22µF if loaded; remains active in shutdown mode. |
| 4: LBO | Open-drain low-battery indicator | Sinks current when LBI < 1.25V; requires external pull-up to VOUT (not >VOUT) for CMOS interfacing. |
| 5: LBI | Low-battery input sense | Monitors input via external resistor divider; threshold fixed at 1.25V; connect to VIN if unused. |
| 6: OUT | Regulated output & bootstrap supply | Delivers regulated voltage; also powers internal circuitry - eliminates need for auxiliary bias rail. |
| 7: GND | Power ground | Low-impedance return path; must be connected directly to solid ground plane to minimize noise and thermal resistance. |
| 8: LX | Switch node | Drain of internal 1A N-MOSFET; connects to inductor and Schottky diode anode; high dv/dt node requiring short trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low start-up voltage | 0.7V minimum enables operation from single-cell alkaline/NiMH batteries at end-of-discharge. |
| Integrated low-battery detection | On-chip comparator with LBI input and open-drain LBO output - eliminates external supervisor IC in portable medical devices. |
| Bootstrapped operation | Internal circuitry powered from OUT pin - removes need for separate bias supply and simplifies BOM. |
| CMOS PFM control architecture | Combines PWM-like efficiency at full load with PFM-like 20µA shutdown current - optimizes battery runtime across load range. |
| Thermally enhanced SO package | SO-8 footprint with 471mW power dissipation at +70°C - supports 200–300mA output without heatsink in compact layouts. |
Applications
| Glucose Meters | Palm-Sized Medical Sensors |
|---|---|
Use Scenario: Portable blood glucose monitoring devices powered by single AA/AAA alkaline cells. IC Role / Device Role / Timing Role: Primary 3.3V/5V step-up regulator supplying MCU, LCD backlight, and analog front-end. Use Value: 0.7V start-up extends usable battery life by >25%; integrated LBI eliminates discrete supervisor, reducing component count by one. | Use Scenario: Handheld ECG or SpO₂ sensors using 2-cell NiMH batteries with tight space constraints. IC Role / Device Role / Timing Role: Compact, efficient DC-DC converter delivering stable 3.3V to low-power ARM Cortex-M0+ MCU and signal chain. Use Value: 87% efficiency at 100mA minimizes heat rise in sealed plastic enclosure; SO-8 footprint fits sub-15mm² PCB area budget. |
| Portable Data Collectors | Personal Digital Assistants (PDAs) |
Use Scenario: Rugged barcode scanners or RFID readers operating from 2-cell primary lithium batteries. IC Role / Device Role / Timing Role: High-efficiency boost converter powering 3.3V logic and 5V peripheral interface (e.g., USB UART bridge). Use Value: Pin-selectable output avoids redesign when migrating between 3.3V and 5V peripheral requirements; 500kHz switching allows tiny 22µH inductor. | Use Scenario: Legacy PDAs with monochrome LCDs and flash memory requiring dual-rail supplies. IC Role / Device Role / Timing Role: Main system regulator generating 3.3V core voltage and 5V I/O voltage from declining battery input. Use Value: 60µA quiescent current extends standby time to >1 week; REF pin provides accurate 1.25V reference for ADC-based battery gauge. |
Availability
MAX756CSA+T is available at Aetrix Electronics and suitable for glucose meters, portable data-collection equipment, and palm-sized medical instrumentation requiring stable component supply across industrial temperature ranges (0°C to +70°C).
Supply support for MAX756CSA+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, sensing, and communication applications.
The MAX756 product line was designed specifically for ultra-low-voltage, battery-critical portable systems - prioritizing start-up capability below 1V, minimal quiescent current, and integration of supervision functions to reduce bill-of-materials.
FAQ
What is the minimum input voltage required for MAX756CSA+T to start regulation?
The MAX756CSA+T starts regulation at a minimum input voltage of 0.7V - verified across temperature and load conditions. This enables reliable operation from single-cell alkaline, NiMH, or Li-FeS₂ batteries even at end-of-discharge. Once started, it continues regulating down to 0.7V under load, making MAX756CSA+T ideal for deeply discharged battery scenarios in portable medical devices.
How does the 3/5 pin select output voltage on MAX756CSA+T?
On MAX756CSA+T, the 3/5 pin sets output voltage: logic low (≤0.4V) selects 5V output; logic high (≥1.6V) selects 3.3V output. The pin has high-impedance MOS input with ESD protection. If left unconnected, its internal pull-down defaults MAX756CSA+T to 5V mode. No external resistors or configuration registers are needed - voltage selection is purely hardware-driven and immediate.
Does MAX756CSA+T remain functional in shutdown mode?
Yes - in shutdown mode (SHDN = low), MAX756CSA+T disables the switching regulator but maintains active 1.25V reference (REF) and low-battery comparator (LBI/LBO). This allows external circuits to monitor battery status or perform wake-up sequencing without re-enabling the main converter. Shutdown quiescent current is only 20µA, preserving battery energy while retaining supervision capability.
What is the maximum continuous output current for MAX756CSA+T at 3.3V?
MAX756CSA+T delivers up to 300mA continuously at 3.3V output, as specified in the Typical Operating Circuit and confirmed in Electrical Characteristics tables. This assumes ambient temperature ≤+70°C, proper PCB layout with GND pin soldered to ground plane, and use of recommended components (22µH inductor, 100µF tantalum output capacitor, 1N5817 Schottky diode). Derating applies above +70°C per SO-8 thermal spec (5.88mW/°C).
Can MAX756CSA+T be used with adjustable-output configurations like MAX757?
No - MAX756CSA+T is a fixed-output variant with pin-selectable 3.3V/5V operation only. It lacks the FB (feedback) pin and internal architecture required for adjustable output. For adjustable designs, MAX757CSA+T is the direct family counterpart, featuring FB pin and 2.7V–5.5V programmable output via external resistor divider. MAX756CSA+T and MAX757CSA+T share pinout compatibility except for pin 2 (3/5 vs. FB), but are not functionally interchangeable.
MAX756CSA+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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX756CSA+T FAQ
1.How can I place an order for MAX756CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX756CSA+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 MAX756CSA+T reliable?
The price and inventory of MAX756CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX756CSA+T is usually 5 days.
3.What payment methods are accepted for MAX756CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX756CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX756CSA+T?
MAX756CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX756CSA+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 MAX756CSA+T?
For technical support, including MAX756CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX756CSA+T requirements.
6.How does Aetrix verify that MAX756CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX756CSA+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 MAX756CSA+T meets industry standards.
7.What is the process for return or replacement of MAX756CSA+T?
All MAX756CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX756CSA+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 MAX756CSA+T part is unused and in its original packaging.
Return procedure for MAX756CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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