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Analog Devices Inc./Maxim Integrated MAX757CPA+
- Part No.:
- MAX757CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX757CPA+.pdf
- Description:
- IC REG BOOST ADJ 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:136
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Product details
Overview
MAX757CPA+ from Maxim Integrated is an adjustable-output, CMOS step-up DC-DC switching regulator optimized for low-input-voltage battery-powered systems. It accepts input voltages as low as 0.7V, delivers 2.7V to 5.5V output via external feedback (FB pin), achieves >87% efficiency at 200mA load, features 60µA quiescent current, and operates up to 500kHz switching frequency. It is used in glucose meters and portable medical instrumentation requiring stable boost conversion from 2–3-cell alkaline or NiMH batteries.
For engineers reviewing the MAX757CPA+ datasheet, MAX757CPA+ pinout, MAX757CPA+ application, or MAX757CPA+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, real-world application constraints, and two rigorously cross-checked alternative parts with documented functional and layout implications.
Technical Context
The MAX757CPA+ implements a constant-off-time pulse-frequency modulation (PFM) control scheme with no oscillator - switching frequency varies dynamically (up to 500kHz) based on load and input voltage. Its internal 1A/0.5Ω N-channel MOSFET power switch enables start-up from 0.7V and supports bootstrapped operation powered from the OUT pin.
It integrates a precision 1.25V reference (±1.5% over temperature), active low-battery detection (LBI/LBO with 1.25V threshold and 25mV hysteresis), and shutdown mode retaining reference and LBI functionality while drawing only 20µA. The FB pin accepts external resistor dividers for precise output programming per VOUT = 1.25V × (1 + R1/R2).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.7V minimum start-up; 0.7V to VOUT − VF (Schottky drop) during operation - enables single-cell alkaline/NiMH use. |
| Output Voltage Range | 2.7V to 5.5V, set externally via FB pin - supports custom rail generation without fixed-output variants. |
| Switching Frequency | Up to 500kHz - permits compact 22µH inductors and reduces EMI filtering burden vs. lower-frequency boosters. |
| Quiescent Current | 60µA typical - extends battery life in always-on portable devices like glucose meters. |
| Reference Voltage | 1.25V ±1.5% over −40°C to +85°C - ensures stable feedback across industrial temperature range. |
| Efficiency | >87% at 200mA load - minimizes thermal rise and extends runtime in space-constrained handhelds. |
| Shutdown Current | 20µA - maintains reference and LBI monitoring while disabling regulation for ultra-low-power sleep states. |
Pinout & Package
MAX757CPA+ is housed in an 8-pin plastic DIP package (0.300" wide, JEDEC MS-001), with through-hole mounting and 0.1" pin pitch. 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 |
|---|---|---|
| SHDN (1) | Active-low shutdown control | Pulls internal regulator offline while keeping REF and LBI active; requires logic-level drive (0.4V low / 1.6V high threshold). |
| FB (2) | Feedback input | Connects to voltage divider between OUT and GND; sets output via VOUT = 1.25V × (1 + R1/R2); max 100nA bias current allows high-value resistors. |
| REF (3) | 1.25V precision reference output | Supplies external circuitry (e.g., ADC reference); 250µA source / 20µA sink capability; bypass with 0.22µF if loaded. |
| LBO (4) | Open-drain low-battery output | Sinks current when LBI < 1.25V; requires external pull-up to VOUT (not >VOUT) for CMOS interfacing. |
| LBI (5) | Low-battery input | Monitors input voltage via resistor divider; threshold = 1.25V with 25mV hysteresis; connect to VIN if unused. |
| OUT (6) | Regulated output connection | Delivers boosted voltage; also supplies bootstrapped power to internal circuitry - must be decoupled with ≥100µF tantalum. |
| GND (7) | Power ground | Primary return path for switch current and output ripple; must have lowest possible impedance - direct ground-plane solder required. |
| LX (8) | Switch node | Drain of internal 1A/0.5Ω N-MOSFET; connects to inductor and Schottky diode anode; high dI/dt node requiring shortest possible trace. |
Key Features
| Feature | Design Value |
|---|---|
| 0.7V minimum start-up voltage | Enables operation from deeply discharged 1-cell alkaline or NiMH batteries - critical for long-life portable medical devices. |
| 60µA quiescent supply current | Reduces standby power loss by >5× vs. bipolar-based boost converters, extending shelf life in battery-backed equipment. |
| Integrated 1.25V reference with 250µA drive | Eliminates need for external reference IC in systems requiring ADC or comparator references - saves board space and BOM cost. |
| Active low-battery detection with hysteresis | Provides reliable end-of-life warning using only two external resistors - avoids premature shutdown during transient load dips. |
| Constant-off-time PFM architecture | Maintains high efficiency (>80%) down to µA-level loads - unlike PWM converters that suffer efficiency collapse at light loads. |
Applications
| Glucose Meters | Portable Data Collectors |
|---|---|
Use Scenario: Handheld blood glucose analyzers powered by two AA alkaline cells, requiring stable 3.3V for microcontroller and sensor interface under varying battery discharge. IC Role / Device Role / Timing Role: Step-up DC-DC converter generating regulated 3.3V from 1.8–3.2V input; provides bootstrapped gate drive and reference for analog front-end. Use Value: Enables full device operation down to 0.7V/cell (1.4V total), extending usable battery life by >30% versus fixed 3.3V regulators with higher dropout. |
Use Scenario: Ruggedized barcode scanners used in warehouse logistics, operating from three NiMH cells with frequent deep discharge cycles. IC Role / Device Role / Timing Role: Adjustable boost regulator delivering 5V to image sensor and USB transceiver; LBI monitors pack voltage to trigger low-power alert before shutdown. Use Value: 87% efficiency at 200mA reduces thermal stress in sealed enclosures; 500kHz switching allows use of miniature 22µH shielded inductors. |
| Palmtop Computers | Medical Instrumentation |
Use Scenario: Legacy palmtop PDAs with monochrome LCD and flash memory, powered by two AAA alkaline cells needing clean 5V rail. IC Role / Device Role / Timing Role: Primary boost converter supplying 5V system rail; FB pin configured for exact 5.00V output; REF powers touch-screen controller reference. Use Value: 60µA quiescent current preserves battery charge during extended suspend modes; shutdown mode retains reference for wake-up circuitry. |
Use Scenario: Portable ECG monitors with analog signal chain and Bluetooth LE radio, running from two lithium coin cells (3V nominal). IC Role / Device Role / Timing Role: Generates 3.3V for MCU and BLE SoC; LBO drives LED indicator for battery status; REF stabilizes ADC reference for accurate biopotential measurement. Use Value: ±1.5% reference tolerance ensures <0.5% gain error in analog front-end; low-noise PFM operation avoids interference with sensitive analog signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | Fixed 500kHz PWM (not PFM); 0.3V start-up; 1.8A switch; requires external compensation. | Better light-load efficiency than PWM competitors but lacks MAX757CPA+'s ultra-low 60µA quiescent current and integrated LBI/LBO. | Choose for higher output current (up to 1.2A) and tighter output regulation; avoid where sub-100µA standby is mandatory. |
| LT1945EMS8#TRPBF | 0.5V start-up; dual-output (boost + inverting); 1.1A switch; 1.22V reference; no integrated LBI. | Supports dual-rail generation in same footprint but lacks low-battery detection and has higher 100µA quiescent current. | Choose when both positive and negative rails are needed; MAX757CPA+ preferred for single-rail, battery-monitoring-critical designs. |
Compared with TPS61200DRCT and LT1945EMS8#TRPBF, the MAX757CPA+ uniquely combines 0.7V start-up, 60µA quiescent current, integrated LBI/LBO, and 1.25V reference in an 8-pin DIP - making it optimal for cost-sensitive, battery-life-critical medical and handheld applications where PCB area and external component count must be minimized.
Availability
MAX757CPA+ is available at Aetrix Electronics and suitable for glucose meters, portable data collectors, and medical instrumentation requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX757CPA+ 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and consumer applications.
The MAX757CPA+ belongs to Maxim's legacy low-voltage boost converter product line, designed specifically for battery-powered portable equipment requiring high efficiency, minimal quiescent current, and integrated power-monitoring functions.
FAQ
What is the minimum input voltage required for MAX757CPA+ to start switching?
The MAX757CPA+ can start switching with an input voltage as low as 0.7V under typical conditions, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This start-up capability is enabled by its low-threshold N-channel MOSFET and bootstrapped architecture. Once started, it continues regulating down to lower input voltages depending on load and output setting - for example, sustaining 3.3V output from ~1.1V input at light loads. The exact start-up voltage varies slightly with temperature and output current, but 0.7V is the guaranteed minimum across the 0°C to +70°C operating range specified for the MAX757CPA+.
How is the output voltage set on the MAX757CPA+?
The output voltage of the MAX757CPA+ is set externally using a resistor divider connected between OUT and GND, with the midpoint feeding the FB pin. The relationship is defined by VOUT = 1.25V × (1 + R1/R2), where R1 connects OUT to FB and R2 connects FB to GND. The internal 1.25V reference (REF pin) and FB's ≤100nA input bias current allow standard 1% resistors in the 10kΩ–200kΩ range. Unlike the MAX756CPA+, the MAX757CPA+ does not use the 3/5 pin - that pin is absent in MAX757 pinout and replaced by FB.
Does the MAX757CPA+ include low-battery detection, and how is it configured?
Yes, the MAX757CPA+ includes integrated low-battery detection via the LBI and LBO pins. LBI compares input voltage against the internal 1.25V reference; when LBI falls below 1.25V, LBO (an open-drain output) sinks current. Configuration uses a resistor divider (R3, R4) from VIN to LBI, where R3 = [(VINTH/1.25V) − 1] × R4. Typical values are 100kΩ/100kΩ for ~2.5V threshold. The comparator remains active in shutdown mode, and LBI hysteresis is 25mV - both parameters are explicitly specified in the MAX757CPA+ datasheet's Electrical Characteristics table.
What package type and dimensions does the MAX757CPA+ use?
The MAX757CPA+ is supplied in an 8-pin plastic DIP (dual in-line package) with 0.300" body width and 0.1" pin pitch, per JEDEC MS-001. Its outline measures 0.197" × 0.244" (5.00mm × 6.20mm) maximum, with lead length 0.122" (3.10mm). This through-hole package is distinct from the SO variant (MAX757CSA+) and is explicitly listed in the Ordering Information table for MAX757CPA. The DIP variant offers robust mechanical mounting and simplified prototyping versus surface-mount alternatives.
Can the MAX757CPA+ operate without an external inductor or diode?
No - the MAX757CPA+ requires both an external inductor and Schottky diode to function. The internal 1A N-MOSFET switch (LX pin) forms the power stage with these external components: the inductor stores energy during switch-on time, and the Schottky diode (e.g., 1N5817) provides the freewheeling path during switch-off. The datasheet specifies a 22µH inductor with ≥1.2A saturation rating and low DC resistance (<0.03Ω), plus a low-VF Schottky diode. Omitting either component prevents regulation and may damage the IC due to uncontrolled current paths.
MAX757CPA+ 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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX757CPA+ FAQ
1.How can I place an order for MAX757CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX757CPA+ 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 MAX757CPA+ reliable?
The price and inventory of MAX757CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX757CPA+ is usually 5 days.
3.What payment methods are accepted for MAX757CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX757CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX757CPA+?
MAX757CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX757CPA+ 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 MAX757CPA+?
For technical support, including MAX757CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX757CPA+ requirements.
6.How does Aetrix verify that MAX757CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX757CPA+ 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 MAX757CPA+ meets industry standards.
7.What is the process for return or replacement of MAX757CPA+?
All MAX757CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX757CPA+, 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 MAX757CPA+ part is unused and in its original packaging.
Return procedure for MAX757CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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