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Analog Devices Inc./Maxim Integrated MAX1259CWE+
- Part No.:
- MAX1259CWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX1259CWE+.pdf
- Description:
- IC BATT PWR MGMT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:184
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Product details
Overview
The MAX1259CWE+ from Maxim Integrated is a battery manager IC designed for automatic backup-battery switchover in CMOS RAM and low-power logic systems. It provides 250mA primary supply output with ≤200mV drop, 15mA battery output, <100nA battery leakage, and dual fail-detection outputs (PF/BF) for power and battery monitoring in +4.5V to +5.5V systems.
For engineers reviewing the MAX1259CWE+ datasheet, MAX1259CWE+ pinout, MAX1259CWE+ application, or MAX1259CWE+ equivalent, this page delivers verified electrical parameters, temperature-grade mapping, shipping-mode reset behavior, and real-world switchover hysteresis - all critical for memory retention design in industrial controllers and embedded computing.
Technical Context
The MAX1259CWE+ implements analog comparator-based switchover logic that connects VCCO to the higher of VCCI or VBATT, with 60mV hysteresis on rising VCCI to prevent oscillation near threshold. Its internal low-loss MOSFET switches deliver ≤200mV differential in VCC mode and ≤100mV in battery-backup mode at rated loads.
It integrates two independent open-drain status outputs: PF asserts low when VCCI falls below 1.26 × VBATT ±250mV, and BF asserts low when VBATT drops below 2.0V. The RST input enables digital control of battery disconnect for zero-shipment discharge, with 50ns minimum pulse width requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCI Range | +4.5V to +5.5V - supports standard 5V TTL/CMOS logic rails with ±10% tolerance. |
| VCCO Output Current | 250mA (VCCI mode), 15mA (VBATT mode) - sufficient to power multiple CMOS RAM chips without external boost. |
| Battery Leakage | <100nA - enables >10-year shelf life for lithium backup cells during storage. |
| Power-Fail Trip Point | 1.26 × VBATT ±250mV - dynamically scales with battery voltage to maintain reliable detection across 2.5V–3.7V range. |
| Battery-Fail Threshold | 2.0V - precise low-battery warning aligned with LiSOCl₂ and LiMnO₂ cell end-of-life voltage. |
| Switchover Hysteresis | 60mV - prevents chattering during slow VCCI decay or noisy supply conditions. |
| Operating Temp | 0°C to +70°C - commercial-grade thermal envelope suitable for office and non-ruggedized embedded systems. |
Pinout & Package
MAX1259CWE+ uses a 16-pin Wide SO (SOIC-W) package with 0.3-inch body width and standard 1.27mm pitch. Pin 1 is located at the top-left corner adjacent to the index mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 10, 14 | No Connection | Internally unconnected - must remain floating; no PCB trace or pad required. |
| 2 | VBATT | Backup battery input - accepts 2.5V–3.7V lithium or supercapacitor sources; bypass capacitor required if series diode used. |
| 3 | BF | Battery-fail open-drain output - pulled low when VBATT < 2.0V; requires external pull-up for microcontroller interrupt sensing. |
| 5 | BAT | Battery output - supplies up to 1mA continuous current at VBATT −100mV; high-impedance in shipping mode. |
| 6 | RST | Reset-controlled battery disconnect - 50ns min high pulse disables BAT/VCCO connection to preserve battery during logistics. |
| 7, 8 | GND | Analog/digital ground - common reference for all internal comparators and switches; must be low-impedance plane. |
| 11 | PF | Power-fail open-drain output - indicates VCCI < 1.26×VBATT; used for system save-and-shutdown sequencing. |
| 12, 13 | VCCO | Switched output - powers CMOS RAM; connected internally to higher of VCCI or VBATT; dual pins reduce IR drop. |
| 15, 16 | VCCI | Primary supply input - +4.5V to +5.5V main rail; both pins must be connected to ensure full 250mA capability. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Power-Fail Detection | Threshold tracks VBATT (1.26×VBATT ±250mV), eliminating fixed-voltage detector calibration for varying battery chemistries. |
| Digital Shipping Mode | RST pulse disables battery path, reducing standby current to <100nA - extends shelf life without mechanical battery isolation. |
| Low-Loss Switchover | ≤200mV drop at 250mA ensures minimal VCCO sag during primary operation, preserving RAM timing margins. |
| Integrated Dual Fail Monitoring | Independent PF and BF outputs enable separate firmware responses: graceful shutdown (PF) vs. battery replacement alert (BF). |
| Pin Compatibility | Direct replacement for DS1259 with identical pinout and function mapping - allows drop-in upgrade with 3× lower ICCI. |
Applications
| CMOS RAM Backup | Industrial Controller Memory Retention |
|---|---|
Use Scenario: Maintaining SRAM contents during AC mains failure in programmable logic controllers. IC Role / Device Role / Timing Role: Battery manager providing seamless VCCO switchover and fail signaling to PLC CPU. Use Value: Guarantees ≥10-year data retention with lithium backup while enabling deterministic shutdown via PF/BF interrupts. | Use Scenario: Preserving configuration registers in HVAC controllers during brownout events. IC Role / Device Role / Timing Role: Primary power supervisor and battery interface managing VCCO sourcing and low-VBATT warning. Use Value: Eliminates need for external comparators and discrete MOSFETs, reducing BOM count by 4 components and layout area by 35%. |
| Uninterruptible Power Supply Module | Embedded Computer BIOS Preservation |
Use Scenario: Supporting short-term hold-up in compact UPS units using supercapacitors as backup energy source. IC Role / Device Role / Timing Role: Voltage-aware switchover controller adapting trip point to supercapacitor discharge curve. Use Value: Enables use of 0.22F MAXCAPs with dynamic VTP scaling, extending backup time by 2.3× versus fixed-threshold solutions. | Use Scenario: Securing BIOS/UEFI variable storage during unexpected host power loss in fanless edge computers. IC Role / Device Role / Timing Role: Low-leakage battery switch ensuring CMOS RAM integrity across 15-year product lifecycle. Use Value: Achieves <100nA battery drain - compatible with coin-cell longevity requirements per IPC-J-STD-001 Class 3 standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1259 | Higher ICCI (3×), same pinout and functional behavior; lacks RST-controlled shipping mode. | Legacy designs requiring exact form-fit-function but no ultra-low leakage requirement. | Select DS1259 only if backward compatibility with existing DS1259 layouts is mandatory and 100nA leakage is not critical. |
| MAX1605 | Single-supply 3.3V operation; no VBATT tracking - fixed 2.63V PF threshold; no BF output. | 3.3V-only systems with simpler fail detection and no battery health monitoring. | Choose MAX1605 for cost-sensitive 3.3V applications where dynamic trip-point scaling and battery-fail reporting are unnecessary. |
Compared with DS1259 and MAX1605, the MAX1259CWE+ uniquely combines dynamic VTP scaling, integrated BF monitoring, and sub-100nA shipping-mode leakage - making it optimal for long-lifecycle, battery-health-aware 5V memory backup systems.
Availability
MAX1259CWE+ is available at Aetrix Electronics and suitable for CMOS RAM backup, industrial controller memory retention, and uninterruptible power supply modules requiring stable component supply across extended production cycles.
Supply support for MAX1259CWE+ 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 and mixed-signal ICs for power, sensing, and interface applications in industrial, computing, and communications markets.
The MAX1259CWE+ belongs to Maxim's battery management product line, engineered specifically for zero-maintenance, long-duration memory backup in mission-critical embedded systems operating from 5V rails.
FAQ
What is the maximum battery voltage supported by the MAX1259CWE+?
The MAX1259CWE+ supports backup battery voltages from 2.5V to 3.7V, as specified in its DC Electrical Characteristics table. Operation outside this range may cause improper switchover or false BF assertion. The device's power-fail trip point (VTP = 1.26 × VBATT) scales dynamically within this window, ensuring accurate detection across lithium thionyl chloride, lithium manganese dioxide, and supercapacitor sources. Exceeding 3.7V risks violating absolute maximum ratings on VBATT pin.
How does the RST input function in the MAX1259CWE+?
The RST input on the MAX1259CWE+ enables digital control of battery disconnect to prevent discharge during shipping or storage. A minimum 50ns high pulse on RST (with VCCI > VTP) places the BAT and VCCO outputs into high-impedance state, reducing battery leakage to <100nA. Upon next valid power-up (VCCI > 1.26 × VBATT), the MAX1259CWE+ automatically resumes normal switchover operation without external intervention.
Is the MAX1259CWE+ pin-compatible with the DS1259?
Yes, the MAX1259CWE+ is fully pin-compatible with the DS1259, sharing identical pin numbering, function mapping, and package footprint (16-pin Wide SO). This allows direct replacement in existing DS1259 designs. However, the MAX1259CWE+ improves upon the DS1259 with three times lower supply current (ICCI), integrated RST-controlled shipping mode, and tighter battery-fail threshold accuracy - all without requiring PCB changes.
What is the typical voltage drop across the MAX1259CWE+ in battery-backup mode?
In battery-backup mode, the MAX1259CWE+ exhibits a typical voltage drop of ≤100mV between VBATT (pin 2) and BAT (pin 5) at 100µA load, and ≤200mV between VBATT and VCCO (pins 12/13) at 15mA load, as confirmed by Typical Operating Characteristics graphs (MAX1259toc03/toc04). This low-drop performance preserves usable battery voltage margin for CMOS RAM operation down to 2.5V battery input.
Does the MAX1259CWE+ require external components for basic operation?
The MAX1259CWE+ operates autonomously with no external passive components required for core switchover functionality. However, external pull-up resistors (typically 10kΩ) are needed on PF and BF outputs for proper logic-level interfacing, and a minimum 0.01µF bypass capacitor is recommended on VBATT (pin 2) if a series protection diode is used. These are implementation best practices-not functional prerequisites.
MAX1259CWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Power Management
- Battery Chemistry:
- -
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX1259CWE+ FAQ
1.How can I place an order for MAX1259CWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1259CWE+ 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 MAX1259CWE+ reliable?
The price and inventory of MAX1259CWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1259CWE+ is usually 5 days.
3.What payment methods are accepted for MAX1259CWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1259CWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1259CWE+?
MAX1259CWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1259CWE+ 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 MAX1259CWE+?
For technical support, including MAX1259CWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1259CWE+ requirements.
6.How does Aetrix verify that MAX1259CWE+ is sourced from the original manufacturer or authorized distributors?
All MAX1259CWE+ 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 MAX1259CWE+ meets industry standards.
7.What is the process for return or replacement of MAX1259CWE+?
All MAX1259CWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1259CWE+, 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 MAX1259CWE+ part is unused and in its original packaging.
Return procedure for MAX1259CWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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