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Analog Devices Inc./Maxim Integrated MAX757CSA-TG068
- Part No.:
- MAX757CSA-TG068
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX757CSA-TG068.pdf
- Description:
- IC REG BOOST ADJ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
MAX757CSA-TG068 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 integrates a precision 1.25V reference with ±1.5% tolerance over temperature - used in glucose meters and portable medical instrumentation.
For engineers reviewing the MAX757CSA-TG068 datasheet, MAX757CSA-TG068 pinout, MAX757CSA-TG068 application, or MAX757CSA-TG068 equivalent, key selection criteria include its adjustable output architecture, 500kHz max switching frequency, shutdown mode with active reference and LBI detector, low-battery monitoring capability, and SO-8 package compatibility with space-constrained portable designs.
Technical Context
The MAX757CSA-TG068 implements a constant-off-time pulse-frequency modulation (PFM) control scheme with no oscillator, enabling ultra-low quiescent current while maintaining high efficiency across load ranges. Its internal 1A/0.5Ω N-channel MOSFET switch supports self-oscillating operation under heavy loads and fixed minimum off-time (1µs) / maximum on-time (4µs) control under light loads.
It integrates a precision 1.25V reference (±1.5% over temperature), low-battery comparator with 1.25V threshold and 25mV hysteresis, and open-drain LBO output. The FB pin accepts external resistor dividers for output voltage setting, with <100nA input bias current ensuring accuracy with high-value resistors (10kΩ–200kΩ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 2.7V to 5.5V - set externally via FB pin and resistor divider; enables flexible system-level voltage scaling. |
| Input Voltage Range (Start-Up) | 0.7V minimum - allows operation from deeply discharged 1-cell or 2-cell alkaline/NiMH batteries. |
| Quiescent Current | 60µA - minimizes standby power loss in always-on portable devices like glucose meters. |
| Switching Frequency | Up to 500kHz - permits use of compact surface-mount magnetics (<5mm diameter) and reduces output ripple. |
| Reference Voltage | 1.25V ±1.5% over temperature - provides stable feedback reference for accurate output regulation and external ADC biasing. |
| Shutdown Current | 20µA - maintains active reference and LBI detector during shutdown for rapid wake-up and battery monitoring. |
| Efficiency | >87% at 200mA - exceeds bipolar-based regulators by ~10%, extending battery life in 2–3 cell equipment. |
Pinout & Package
MAX757CSA-TG068 is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body size, 1.27mm pitch, with GND pin (7) requiring direct soldering to ground plane for optimal thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Shutdown Input | Active-low logic control; disables SMPS but keeps reference and LBI comparator active - enables low-power battery monitoring without full restart. |
| 2 FB | Feedback Input | Connects to voltage divider between OUT and GND; sets output via VOUT = 1.25V × (R1+R2)/R2 - supports precise, user-defined output voltages. |
| 3 REF | 1.25V Reference Output | Stable, buffered reference with 250µA source/20µA sink capability; remains active in shutdown - usable for external analog circuitry or ADC reference. |
| 4 LBO | Low-Battery Output | Open-drain N-MOS output sinking current when LBI < 1.25V - drives microcontroller interrupt or LED indicator without external pull-up to >VOUT. |
| 5 LBI | Low-Battery Input | Monitors input voltage via external resistor divider; threshold fixed at 1.25V - enables programmable battery depletion detection independent of output voltage. |
| 6 OUT | Regulated Output | Delivers stepped-up DC voltage; also supplies bootstrapped power to internal circuitry - eliminates need for auxiliary supply rail. |
| 7 GND | Power Ground | Low-impedance return path; must be soldered directly to ground plane to minimize ground bounce and ensure stability at 500kHz switching. |
| 8 LX | Switch Node | Drain of internal 1A/0.5Ω N-MOSFET; connects to inductor and Schottky diode - requires short, low-inductance PCB trace to reduce EMI and switching losses. |
Key Features
| Feature | Design Value |
|---|---|
| 0.7V Minimum Start-Up Voltage | Enables reliable startup from single-cell alkaline or NiMH batteries at end-of-life, extending usable battery capacity. |
| Adjustable Output via FB Pin | Supports any output between 2.7V and 5.5V using two standard resistors - eliminates need for multiple fixed-output variants in BOM. |
| Active Reference in Shutdown Mode | Permits continuous low-battery monitoring and fast wake-up without reference re-stabilization delay - critical for medical alert responsiveness. |
| Integrated Low-Battery Detector | On-chip comparator with 1.25V threshold and 25mV hysteresis reduces component count and improves detection accuracy vs. discrete solutions. |
| 500kHz Max Switching Frequency | Allows use of small 22µH surface-mount inductors and 100µF tantalum output capacitors - saves board area in handheld form factors. |
Applications
| Glucose Meters | Portable Data Collectors |
|---|---|
Use Scenario: Battery-powered handheld device measuring blood glucose levels with LCD display and microcontroller. IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3V or 5V from 2-cell alkaline (1.8–3.0V) for MCU, sensor interface, and display driver. Use Value: 0.7V start-up ensures operation until battery reaches 0.9V per cell; 60µA quiescent current extends shelf life and reduces calibration drift between tests. |
Use Scenario: Rugged field instrument capturing barcode, RFID, or sensor data on rechargeable NiMH packs. IC Role / Device Role / Timing Role: Adjustable 3.3V/5V power source for mixed-signal SoC, wireless transceiver, and memory subsystem. Use Value: FB-based output flexibility accommodates varying SoC core/I/O voltage requirements; integrated LBI/LBO simplifies battery health reporting without extra comparators. |
| Palmtop Computers | Medical Instrumentation |
Use Scenario: Compact PDA-style computing device with flash storage, touchscreen, and serial interfaces. IC Role / Device Role / Timing Role: Primary DC-DC converter supplying regulated 3.3V to processor and peripherals from 2–3 cell primary batteries. Use Value: >87% efficiency at 200mA minimizes heat generation in sealed plastic enclosures; SO-8 package fits tight layout constraints near battery connector. |
Use Scenario: Portable diagnostic tool (e.g., pulse oximeter, ECG monitor) requiring FDA-compliant power integrity and low EMI. IC Role / Device Role / Timing Role: Isolated, low-noise 5V supply for analog front-end and isolated digital communication. Use Value: Constant-off-time PFM control avoids fixed-frequency switching noise that could interfere with sensitive analog measurements; GND pin grounding directive ensures signal integrity. |
Availability
MAX757CSA-TG068 is available at Aetrix Electronics and suitable for portable medical instrumentation, glucose meters, and battery-powered data collectors requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX757CSA-TG068 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 connectivity applications.
The MAX757CSA-TG068 belongs to Maxim's legacy step-up DC-DC converter family, engineered specifically for ultra-low-voltage battery operation in portable medical, industrial, and consumer devices where efficiency, small size, and reliability are critical.
FAQ
What is the minimum input voltage required for MAX757CSA-TG068 to start up?
The MAX757CSA-TG068 starts up from as low as 0.7V input voltage, enabling operation from nearly depleted single-cell alkaline or NiMH batteries. This specification is verified across temperature and load conditions per Maxim's Electrical Characteristics table, and is critical for maximizing battery utilization in glucose meters and similar portable devices where MAX757CSA-TG068 serves as the primary power source.
How is the output voltage set on the MAX757CSA-TG068?
The MAX757CSA-TG068 uses the FB (feedback) pin to set output voltage via an external resistor divider between OUT and GND. The formula is VOUT = 1.25V × (R1 + R2) / R2, where R1 connects to OUT and R2 to GND. With <100nA FB input bias, standard 1% resistors (e.g., 100kΩ/31.6kΩ for 5.0V) maintain accuracy without trimming - a key design advantage of MAX757CSA-TG068 over fixed-output alternatives.
Does the MAX757CSA-TG068 retain functionality in shutdown mode?
Yes - when SHDN is pulled low, the MAX757CSA-TG068 disables the switching regulator but keeps the 1.25V reference and low-battery comparator fully active. This allows continuous battery monitoring and fast wake-up without reference stabilization delay, making MAX757CSA-TG068 ideal for applications like medical alert devices where responsiveness and low standby power are essential.
What package type is used for the MAX757CSA-TG068?
The MAX757CSA-TG068 is supplied in an 8-pin SO (Small Outline) package, measuring 3.9mm × 4.9mm with 1.27mm lead pitch. Its GND pin (pin 7) must be soldered directly to a solid ground plane to ensure thermal stability and minimize noise - a requirement explicitly documented in the MAX757CSA-TG068 typical operating circuit and PC layout guidelines.
Can the MAX757CSA-TG068 replace the MAX756 in existing designs?
No - the MAX757CSA-TG068 is not a drop-in replacement for the MAX756. While both share the same SO-8 pinout, MAX756 uses the 3/5 pin for fixed 3.3V/5V selection, whereas MAX757CSA-TG068 repurposes that pin as FB for adjustable output. Swapping them requires redesigning the feedback network and verifying LBI/LBO behavior, so MAX757CSA-TG068 is intended for new adjustable-output designs, not MAX756 retrofits.
MAX757CSA-TG068 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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-TG068 FAQ
1.How can I place an order for MAX757CSA-TG068 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX757CSA-TG068 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-TG068 reliable?
The price and inventory of MAX757CSA-TG068 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX757CSA-TG068 is usually 5 days.
3.What payment methods are accepted for MAX757CSA-TG068?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX757CSA-TG068 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX757CSA-TG068?
MAX757CSA-TG068 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX757CSA-TG068 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-TG068?
For technical support, including MAX757CSA-TG068 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX757CSA-TG068 requirements.
6.How does Aetrix verify that MAX757CSA-TG068 is sourced from the original manufacturer or authorized distributors?
All MAX757CSA-TG068 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-TG068 meets industry standards.
7.What is the process for return or replacement of MAX757CSA-TG068?
All MAX757CSA-TG068 units undergo pre-shipment inspection (PSI). If there is an issue with MAX757CSA-TG068, 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-TG068 part is unused and in its original packaging.
Return procedure for MAX757CSA-TG068:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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