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Analog Devices Inc./Maxim Integrated MAX756CSA+
- Part No.:
- MAX756CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX756CSA+.pdf
- Description:
- IC REG BOOST PROG 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
MAX756CSA+ 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, palmtop computers, and portable data-collection equipment.
For engineers reviewing the MAX756CSA+ datasheet, MAX756CSA+ pinout, MAX756CSA+ application, or MAX756CSA+ 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 (20µA), and SO-8 thermal performance (471mW at +70°C).
Technical Context
The MAX756CSA+ employs a constant-off-time pulse-frequency modulation (PFM) control scheme with no oscillator, enabling ultra-low quiescent current and variable switching frequency up to 500kHz. Its internal 1A/0.5Ω N-channel MOSFET switch and bootstrapped gate drive allow reliable start-up below 1V after initial turn-on.
It integrates a precision 1.25V reference (±1.5% over temperature), active low-battery comparator (1.25V threshold), and logic-controlled output selection (3/5 pin). The reference remains active in shutdown, supporting external ADC biasing while consuming only 20µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.7V min start-up; 2V–VOUT operating range - enables single-cell alkaline or NiMH operation down to end-of-life. |
| Output Voltage | PIN-selectable 3.3V (±3%) or 5V (±3%) - 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% typ @ full load - achieved via CMOS process, low-RDS(on) switch, and PFM architecture minimizing light-load losses. |
| Quiescent Current | 60µA active, 20µA shutdown - supports long battery life in intermittent-use medical and handheld devices. |
| Switching Frequency | Up to 500kHz - enables use of compact 22µH surface-mount inductors <5mm diameter. |
| Reference Voltage | 1.25V ±1.5% over –40°C to +85°C - stable enough for external ADC reference or precision divider networks. |
Pinout & Package
MAX756CSA+ is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, 150 mil width, with 1.27mm pitch and exposed pad not present. Thermal resistance θJA = 170°C/W; max power dissipation = 471mW at TA = +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low shutdown control | Drives internal SMPS off while keeping reference and LBI comparator active; 0.4V/1.6V logic thresholds. |
| 2 - 3/5 | Output voltage select | Low = 5V output, high = 3.3V output; must be tied to GND or OUT for fixed-mode operation. |
| 3 - REF | 1.25V precision reference output | Supplies 250µA max source / 20µA sink; bypass with 0.22µF if loaded, 0.1µF if unloaded. |
| 4 - LBO | Open-drain low-battery indicator | Sinks current when LBI < 1.25V; requires external pull-up to VOUT (≤7V); active in shutdown. |
| 5 - LBI | Low-battery input sense | Monitors input via external resistor divider; threshold = 1.25V; connect to VIN if unused. |
| 6 - OUT | Regulated output connection | Provides bootstrapped gate drive for internal MOSFET; connects to output capacitor and feedback path. |
| 7 - GND | Power ground | Must be low-impedance; solder directly to PCB ground plane to minimize noise and thermal rise. |
| 8 - LX | Switch node | Connects to inductor and Schottky diode anode; carries high di/dt; requires short, wide trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low start-up voltage | 0.7V minimum - enables operation from deeply discharged 1-cell alkaline or NiMH batteries. |
| Integrated low-battery detection | Dedicated LBI/LBO pins with 1.25V threshold and hysteresis - eliminates need for external supervisor IC in portable medical devices. |
| Bootstrapped gate drive | Internal charge pump powered from OUT pin - ensures strong MOSFET turn-on even at low input voltages. |
| CMOS PFM control | No oscillator; self-oscillating peak-current limit + one-shot timing - achieves 60µA IQ without sacrificing transient response. |
| Thermally optimized SO package | SO-8 footprint with 471mW power rating at +70°C - supports 200–300mA loads without heatsink in space-constrained layouts. |
Applications
| Glucose Meters | Palmtop Computers |
|---|---|
Use Scenario: Battery-powered handheld device requiring stable 3.3V rail for microcontroller, LCD, and analog front-end during intermittent glucose strip measurement cycles. IC Role / Device Role / Timing Role: Primary step-up regulator generating clean 3.3V from single 1.5V alkaline cell; provides reference voltage for ADC and drives LBO for battery alert. Use Value: 0.7V start-up extends usable battery life by >25%; 60µA quiescent current enables multi-week standby without recharge. | Use Scenario: Compact computing platform using dual 1.5V AA cells, needing regulated 5V for USB peripherals and 3.3V for CPU core, with battery-level monitoring. IC Role / Device Role / Timing Role: Dual-output-capable DC-DC converter selected via 3/5 pin; supplies both rails from same input; LBI monitors declining cell voltage. Use Value: Eliminates need for separate regulators or discrete supervisor; 500kHz switching allows miniaturized 22µH inductor and 100µF tantalum output cap. |
| Portable Data-Collection Terminals | Medical Instrumentation |
Use Scenario: Rugged handheld scanner with barcode imager, Bluetooth radio, and flash memory - all powered from two NiMH cells (1.2V nominal). IC Role / Device Role / Timing Role: High-efficiency boost converter delivering 5V@200mA to imager and radio; uses SHDN for power-gating between scans. Use Value: 87% efficiency minimizes heat in sealed enclosure; 20µA shutdown current preserves battery during 90% idle time. | Use Scenario: Portable ECG or pulse oximeter operating from coin-cell or AAA battery, requiring precise 3.3V for analog signal chain and digital processing. IC Role / Device Role / Timing Role: Primary power source with integrated 1.25V reference feeding ADC reference input and LBI comparator for battery warning. Use Value: ±1.5% reference tolerance over temperature ensures consistent ADC accuracy; REF remains active in shutdown for fast wake-up. |
Availability
MAX756CSA+ is available at Aetrix Electronics and suitable for glucose meters, palmtop computers, and portable data-collection terminals requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX756CSA+ 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 MAX756CSA+ belongs to Maxim's legacy low-voltage DC-DC converter product line, engineered specifically for battery-powered portable instrumentation where start-up voltage, quiescent current, and integration of battery monitoring are critical.
FAQ
What is the minimum input voltage required for the MAX756CSA+ to start up?
The MAX756CSA+ starts up from as low as 0.7V input, verified across temperature and load conditions. This capability is enabled by its low-threshold N-channel MOSFET and bootstrapped gate drive. Once started, it continues regulating down to ~1.0V under load. The exact start-up voltage varies slightly with output setting (3.3V vs. 5V) and load, but 0.7V is the guaranteed minimum per datasheet specification for MAX756CSA+.
Can the MAX756CSA+ generate an adjustable output voltage?
No, the MAX756CSA+ does not support adjustable output. It is a fixed-output variant that provides only 3.3V or 5V, selected by the logic level on the 3/5 pin. For adjustable output, the MAX757CSA+ is the functional counterpart - it replaces the 3/5 pin with FB (feedback) and uses an external resistor divider to set VOUT from 2.7V to 5.5V. The MAX756CSA+ lacks FB functionality and internal circuitry for voltage programming.
How does the low-battery detection work on the MAX756CSA+?
The MAX756CSA+ implements low-battery detection using the LBI and LBO pins. LBI is compared internally to the 1.25V reference; when LBI falls below this threshold, LBO (an open-drain N-MOSFET) pulls low. An external resistor divider from VIN to GND sets the detection point - e.g., 2.5V threshold uses R3/R4 = 1:1. Critically, both the comparator and reference remain active during SHDN mode, allowing battery monitoring even when the regulator is off. This behavior is confirmed in the MAX756CSA+ datasheet's "Detailed Description" and "Electrical Characteristics" sections.
What is the maximum continuous output current for MAX756CSA+ at 3.3V output?
The MAX756CSA+ delivers up to 300mA continuously at 3.3V output, as specified in the "Typical Operating Circuit" and "Ordering Information" tables. This assumes TA ≤ +70°C, proper PCB layout (ground plane, short traces), and recommended components (22µH inductor, 100µF tantalum output cap, 1N5817 Schottky diode). At higher ambient temperatures or with less optimal thermal design, current must be derated per the SO-8 package's 5.88mW/°C thermal derating curve above +70°C.
Does the MAX756CSA+ require an external compensation network?
No, the MAX756CSA+ does not require external compensation. Its constant-off-time PFM control architecture is internally compensated and stable with the standard application circuit: 22µH inductor, 100µF output capacitor, and 1N5817 Schottky diode. The datasheet provides no compensation pin, no stability guidelines, and no Bode plot - confirming full internal compensation. Adding external RC networks is unnecessary and may degrade transient response or efficiency. This is a key differentiator from voltage-mode PWM controllers that require loop compensation.
MAX756CSA+ 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:
- 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+ FAQ
1.How can I place an order for MAX756CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX756CSA+ 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+ reliable?
The price and inventory of MAX756CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX756CSA+ is usually 5 days.
3.What payment methods are accepted for MAX756CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX756CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX756CSA+?
MAX756CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX756CSA+ 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+?
For technical support, including MAX756CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX756CSA+ requirements.
6.How does Aetrix verify that MAX756CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX756CSA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX756CSA+?
All MAX756CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX756CSA+, 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+ part is unused and in its original packaging.
Return procedure for MAX756CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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