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Analog Devices Inc./Maxim Integrated MAX756CPA+
- Part No.:
- MAX756CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX756CPA+.pdf
- Description:
- IC REG BOOST PROG 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,899
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Product details
Overview
MAX756CPA+ from Maxim Integrated is a CMOS step-up DC-DC switching regulator designed for low-input-voltage, battery-powered systems. It accepts input as low as 0.7V and delivers a pin-selectable 3.3V or 5V output with up to 300mA at 3.3V or 200mA at 5V, 87% typical efficiency, 60µA quiescent current, and operates in 0°C to +70°C temperature range using an 8-pin plastic DIP package - deployed in glucose meters and palmtop computers.
For engineers reviewing the MAX756CPA+ datasheet, MAX756CPA+ pinout, MAX756CPA+ application, or MAX756CPA+ equivalent, this page provides verified functional identity, validated pin roles, confirmed operating parameters (including start-up voltage, reference tolerance, LBI threshold), real-world load-transient behavior, and direct alternative options for 3.3V/5V boost conversion in space-constrained portable instrumentation.
Technical Context
The MAX756CPA+ integrates an N-channel MOSFET power switch (1A peak, 0.5Ω RDS(ON)), precision 1.25V reference (±1.5% over temperature), low-battery comparator (LBI/LBO), and constant-off-time pulse-frequency modulation (PFM) control - eliminating external oscillator while enabling self-oscillating operation across 100kHz–500kHz depending on load and input voltage.
It uses internal bootstrapping from the OUT pin to power its control circuitry, allowing operation even when input sags below 1V after startup. The 3/5 pin selects fixed 3.3V (high) or 5V (low) output without external feedback components, distinguishing it from the adjustable MAX757 variant which requires FB resistor divider network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Pin-selectable 3.3V (3/5 = high) or 5V (3/5 = low); no external resistors required. |
| Input Voltage Range | 0.7V minimum start-up; 0.7V to VOUT − VF (Schottky drop) during operation. |
| Efficiency | 87% typical at full load (200mA @ 5V or 300mA @ 3.3V), enabling extended battery life in portable devices. |
| Quiescent Current | 60µA in active mode; 20µA in shutdown with reference and LBI detector still operational. |
| Switching Frequency | Up to 500kHz (load- and input-dependent); enables use of compact <5mm surface-mount inductors. |
| Reference Voltage | 1.25V ±1.5% over 0°C to +70°C; capable of sourcing 250µA for external ADC biasing. |
| LBI Threshold | 1.25V with 25mV hysteresis; supports accurate low-battery detection with minimal external components. |
Pinout & Package
MAX756CPA+ is housed in an 8-pin plastic DIP (dual in-line package) with 0.3" wide body, 0.1" pin pitch, and through-hole mounting compatibility. Pin 7 (GND) must be soldered directly to a low-impedance ground plane to minimize noise and ensure stable regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Shutdown control input | Active-low logic input; disables SMPS but keeps reference and LBI comparator active in shutdown mode. |
| 2 (3/5) | Output voltage select | High = 3.3V output; low = 5V output; ties internally to logic threshold (~1V) independent of output mode. |
| 3 (REF) | Precision voltage reference output | 1.25V ±1.5%, supplies external circuits (e.g., ADCs); bypass with 0.22µF if loaded, 0.1µF if unloaded. |
| 4 (LBO) | Low-battery open-drain output | Sinks current when LBI < 1.25V; requires external pull-up (≥10kΩ to VOUT) for CMOS interfacing. |
| 5 (LBI) | Low-battery input sense | Compares VIN-derived voltage against internal 1.25V reference; connect to VIN via resistor divider if used. |
| 6 (OUT) | Regulated output and bootstrap supply | Delivers final 3.3V/5V output; also powers internal control circuitry via bootstrapping - critical for low-VIN operation. |
| 7 (GND) | Power ground | Must be low-impedance connection to ground plane; all high-current return paths converge here. |
| 8 (LX) | Switch node | Drain of internal 1A, 0.5Ω N-MOSFET; connects to inductor and Schottky diode anode; high dv/dt node requiring short PCB trace. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low start-up voltage | Operates from 0.7V input - enables use with single-cell alkaline or NiMH batteries down to end-of-life. |
| Integrated low-battery detection | On-chip LBI/LBO comparator eliminates need for external supervisor IC in portable medical and data-collection devices. |
| CMOS PFM control architecture | Combines PWM-like efficiency at heavy loads with PFM-like 20µA shutdown current - no external oscillator required. |
| Internal bootstrapped power | Derives gate drive and bias from OUT pin, sustaining regulation even when input drops below 1V post-startup. |
| Fixed-output simplicity | No feedback resistors needed - 3/5 pin selection replaces external divider network required by adjustable regulators like MAX757. |
Applications
| Glucose Meters | Palmtop Computers |
|---|---|
Use Scenario: Portable handheld device measuring blood glucose levels using electrochemical sensor requiring stable 3.3V rail from single AA/AAA cell. IC Role / Device Role / Timing Role: Step-up DC-DC converter providing regulated 3.3V output while maintaining ultra-low quiescent current between measurements. Use Value: Enables >1000 tests per battery set by delivering 300mA at 3.3V with 87% efficiency and 60µA active-mode supply current. |
Use Scenario: Compact computing platform powered by two or three alkaline cells, needing clean 5V supply for microcontroller and display backlight. IC Role / Device Role / Timing Role: Primary boost regulator generating 5V output from declining 2–3V battery stack, with LBO signaling battery depletion. Use Value: Supports continuous operation down to 0.7V input and provides early low-battery warning via LBI/LBO without adding discrete comparators. |
| Portable Data-Collection Equipment | Medical Instrumentation |
Use Scenario: Handheld barcode scanner or RFID reader operating from 2-cell battery pack, requiring 5V for laser diode driver and 3.3V for MCU. IC Role / Device Role / Timing Role: Single-chip boost solution delivering either 3.3V or 5V output on demand, with shutdown control for sleep/wake cycles. Use Value: Reduces BOM count by integrating reference, LBI comparator, and 1A switch - simplifying layout and improving reliability in field-deployed units. |
Use Scenario: Battery-powered patient monitor with analog front-end, ADC, and LCD requiring isolated, low-noise 3.3V supply. IC Role / Device Role / Timing Role: High-efficiency boost converter supplying precision 3.3V rail while keeping EMI low via variable-frequency PFM operation. Use Value: Delivers 1.25V reference with ±1.5% tolerance and 250µA sourcing capability - directly powering ADC reference without external buffer. |
Availability
MAX756CPA+ is available at Aetrix Electronics and suitable for glucose meters, palmtop computers, and portable data-collection equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX756CPA+ 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 MAX756CPA+ belongs to Maxim's legacy high-efficiency boost converter product line, engineered specifically for ultra-low-voltage battery-powered instrumentation where start-up voltage, quiescent current, and integration density are critical.
FAQ
What is the minimum input voltage required for MAX756CPA+ to start up?
The MAX756CPA+ starts up from as low as 0.7V input under light load conditions, verified per datasheet Figure 1 and Electrical Characteristics table. This capability allows reliable operation with nearly depleted alkaline or NiMH cells. Once started, the device continues regulating even if input sags below 1V due to internal bootstrapping from the OUT pin. The exact start-up voltage varies slightly with load and temperature but remains ≤0.7V across the 0°C to +70°C range specified for MAX756CPA+.
Can MAX756CPA+ be used in shutdown mode while retaining low-battery monitoring?
Yes - when SHDN is pulled low, the MAX756CPA+ enters shutdown mode drawing only 20µA, yet the internal 1.25V reference and LBI/LBO comparator remain fully active. This allows continuous low-battery monitoring without waking the main system, making MAX756CPA+ ideal for always-on supervision in medical and portable instrumentation. The LBO output sinks current when LBI falls below 1.25V, and the reference can still source up to 250µA for external circuitry.
How does the 3/5 pin determine output voltage in MAX756CPA+?
In MAX756CPA+, the 3/5 pin is a logic-controlled selector: pulling it high (≥1.8V) configures the output to 3.3V ±3.5%, while pulling it low (≤0.4V) sets output to 5.0V ±4%. This selection is implemented internally - no external resistors are needed, unlike the MAX757 which uses FB feedback. The logic threshold is approximately 1V and is independent of output voltage mode, ensuring robust operation across battery discharge profiles.
What is the maximum output current capability of MAX756CPA+ at 3.3V and 5V?
The MAX756CPA+ delivers up to 300mA at 3.3V output (with 3/5 = high) and up to 200mA at 5V output (with 3/5 = low), as confirmed in the Typical Operating Circuit and Electrical Characteristics tables. These values assume VIN ≥ 2.0V for 3.3V mode and VIN ≥ 3.3V for 5V mode, with proper layout, low-ESR capacitors, and a 22µH inductor. Output current decreases as input voltage drops, especially near the 0.7V start-up threshold.
Does MAX756CPA+ require an external Schottky diode, and why?
Yes - MAX756CPA+ requires an external Schottky diode (e.g., 1N5817) connected between LX and OUT pins. The internal N-MOSFET switch lacks body diode conduction capability in boost topology, so the external diode provides the freewheeling path during switch off-time. Schottky type is mandatory due to its low forward voltage (~0.3V), minimizing conduction loss and preserving efficiency; a standard PN diode like 1N4148 increases losses significantly and is only acceptable in very low-power applications.
MAX756CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX756CPA+ FAQ
1.How can I place an order for MAX756CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX756CPA+ 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 MAX756CPA+ reliable?
The price and inventory of MAX756CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX756CPA+ is usually 5 days.
3.What payment methods are accepted for MAX756CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX756CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX756CPA+?
MAX756CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX756CPA+ 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 MAX756CPA+?
For technical support, including MAX756CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX756CPA+ requirements.
6.How does Aetrix verify that MAX756CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX756CPA+ 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 MAX756CPA+ meets industry standards.
7.What is the process for return or replacement of MAX756CPA+?
All MAX756CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX756CPA+, 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 MAX756CPA+ part is unused and in its original packaging.
Return procedure for MAX756CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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