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Analog Devices Inc./Maxim Integrated MAX1259EWE+
- Part No.:
- MAX1259EWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX1259EWE+.pdf
- Description:
- IC BATT PWR MGMT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,344
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Product details
Overview
The MAX1259EWE+ 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, battery-fail (BF) and power-fail (PF) monitoring, and shipping-mode disconnect via RST pulse. Used in industrial controllers and memory backup circuits requiring extended-temperature operation.
For engineers reviewing the MAX1259EWE+ datasheet, MAX1259EWE+ pinout, MAX1259EWE+ application, or MAX1259EWE+ equivalent, key selection criteria include VCCI/VCCO switching hysteresis, 2.0V BF trip point, -40°C to +85°C operating range, and 150nA max battery leakage current under extended temperature conditions.
Technical Context
The MAX1259EWE+ implements dual-path analog switching between VCCI (primary +4.5V to +5.5V) and VBATT (2.5V–3.7V), with hysteresis of 60mV to prevent oscillation during slow VCCI transitions. Switchover occurs at VCCI = VBATT (falling) and VCCI = VBATT + 60mV (rising).
It integrates two open-drain status outputs: PF asserts low when VCCI falls below 1.26 × VBATT ±250mV; BF asserts low when VBATT drops below 2.0V. The RST input enables digital control of battery disconnection, placing BAT and VCCO in high-impedance state during shipping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCI Range | +4.5V to +5.5V - supports standard 5V logic rails with ±10% tolerance |
| VBATT Range | 2.5V to 3.7V - compatible with lithium coin cells and supercapacitors |
| VCCO Output Current | 250mA (VCCI mode), 15mA (battery mode) - sufficient for multi-chip CMOS RAM banks |
| Battery Leakage | ≤150nA at -40°C to +85°C - ensures >10-year shelf life for shipped systems |
| Switch Voltage Drop | ≤200mV at 250mA - minimizes voltage loss on primary path, preserving RAM retention margin |
| BF Trip Point | 2.0V (fixed) - triggers early warning before lithium cell reaches end-of-life cutoff |
| PF Trip Accuracy | ±250mV around 1.26×VBATT - enables precise power-fail detection across battery voltage range |
Pinout & Package
MAX1259EWE+ 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 or grounded per layout best practice |
| 2 | VBATT | Backup battery input; accepts 2.5V–3.7V sources; bypass capacitor required if series diode used |
| 3 | BF | Battery-fail open-drain output; pulled low when VBATT < 2.0V or VCCI < VTP |
| 5 | BAT | Battery output; supplies up to 1mA; high-impedance in shipping mode |
| 6 | RST | Reset input; ≥50ns pulse disconnects battery; requires VIH ≥2.4V (E-grade) |
| 7, 8 | GND | Analog/digital ground reference; both pins must be connected to common system ground plane |
| 11 | PF | Power-fail open-drain output; pulled low when VCCI < 1.26×VBATT ±250mV |
| 12, 13 | VCCO | Switched output to RAM/load; dual pins reduce IR drop and improve current sharing |
| 15, 16 | VCCI | Primary +5V input; both pins must be connected to minimize impedance and ensure stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Automatic switchover with 60mV hysteresis | Prevents chattering during brownout conditions and extends battery life by eliminating repeated transitions |
| Digital battery disconnect via RST | Enables zero-current shipping mode without external switches or PCB modifications |
| 1.26×VBATT power-fail threshold | Tracks battery voltage dynamically, ensuring reliable fail detection across aging and temperature |
| 2.0V fixed battery-fail threshold | Provides consistent low-battery warning independent of VCCI variation or load transients |
| 16-pin Wide SO package with lead-free finish | RoHS-compliant, industry-standard footprint compatible with automated SMT assembly and reflow profiles |
Applications
| Industrial Controllers | Uninterruptible Power Supplies |
|---|---|
Use Scenario: PLCs and RTUs retaining configuration and process data during AC mains interruption. IC Role / Device Role / Timing Role: Battery manager providing seamless VCCO switchover and real-time BF/PF status to controller firmware. Use Value: Guarantees ≥10-year data retention with 150nA max battery drain and eliminates need for external supervision circuitry. | Use Scenario: Small-footprint UPS modules backing up microcontroller and SRAM during grid failure. IC Role / Device Role / Timing Role: Dual-monitoring switch delivering clean VCCO and asserting PF/BF flags for graceful shutdown sequencing. Use Value: Enables deterministic shutdown within 100µs of PF assertion, using only internal hysteresis-no external comparators required. |
| Computers & Embedded Systems | CMOS RAM Backup Circuits |
Use Scenario: BIOS/UEFI firmware storage in ruggedized edge computing devices operating from -40°C to +85°C. IC Role / Device Role / Timing Role: Temperature-hardened battery manager maintaining RAM voltage during cold-start and thermal cycling. Use Value: Qualified for extended industrial range; maintains 200mV max switch drop across full temperature span, preserving RAM VCC margin. | Use Scenario: Legacy and modern CMOS RAM modules requiring long-term nonvolatile data hold with minimal board space. IC Role / Device Role / Timing Role: Integrated switchover, monitoring, and disconnect controller replacing discrete MOSFET + comparator solutions. Use Value: Reduces BOM count by 4–6 components while improving reliability and reducing PCB area by >30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1259 | Pin-compatible but consumes ~3× more supply current (≥300nA vs. 150nA); no extended-temp grade available | Limited to commercial temp range (0°C to +70°C); lacks RST-controlled shipping mode | Select DS1259 only for legacy designs where MAX1259EWE+ footprint compatibility is unnecessary and temperature range is not critical. |
| MAX1605 | Single-supply supervisor with reset generator; no battery switchover or BF/PF monitoring; no RST-controlled disconnect | Designed for reset-only functions-not suitable for RAM backup; requires external switching FETs and comparators | Choose MAX1605 only when system already includes discrete battery switching and only needs power monitoring/reset generation. |
Compared with DS1259 and MAX1605, the MAX1259EWE+ uniquely combines extended-temperature operation, ultra-low battery leakage, integrated switchover, and programmable shipping mode in a single 16-pin SO package-enabling compact, high-reliability memory backup without design compromises.
Availability
MAX1259EWE+ is available at Aetrix Electronics and suitable for industrial controllers, uninterruptible power supplies, and embedded computers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX1259EWE+ 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, automotive, and communications applications.
The MAX1259EWE+ belongs to Maxim's battery management product line, engineered specifically for reliable, low-leakage switchover in mission-critical memory backup systems operating across harsh environmental conditions.
FAQ
What is the operating temperature range for the MAX1259EWE+?
The MAX1259EWE+ is rated for operation from -40°C to +85°C, making it suitable for extended industrial environments. This range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the official datasheet. Unlike the commercial-grade MAX1259CWE+, the E-grade variant guarantees performance across this full span, including leakage current ≤150nA and switch drop ≤200mV at temperature extremes. The MAX1259EWE+ achieves this through process and design optimizations specific to the E-suffix device family.
How does the MAX1259EWE+ handle battery disconnection during shipping?
The MAX1259EWE+ uses its RST input to enter shipping mode: a ≥50ns high pulse disconnects the backup battery from VCCO and places BAT in high-impedance state. This reduces battery leakage to ≤150nA, enabling multi-year shelf life. When VCCI is reapplied above 1.26×VBATT, the device automatically resumes normal operation. This feature eliminates the need for mechanical battery removal or external switches-critical for automated manufacturing and field-deployed equipment where physical access is limited. The MAX1259EWE+ implements this entirely internally with no external components required.
What is the power-fail detection threshold of the MAX1259EWE+?
The MAX1259EWE+ power-fail (PF) output asserts low when VCCI falls below 1.26 × VBATT ±250mV. This dynamic threshold tracks the backup battery voltage, ensuring accurate fail detection regardless of VBATT aging or temperature drift. For example, with VBATT = 3.0V, PF trips at 3.78V ±0.25V. The PF signal is open-drain and requires an external pull-up; it drives low within 0 µs of crossing the threshold (tPF = 0 µs). This behavior is specified in the DC Electrical Characteristics table and verified across all E-grade operating conditions. The MAX1259EWE+ does not use a fixed voltage threshold, distinguishing it from simpler supervisors.
Can the MAX1259EWE+ support supercapacitors as backup sources?
Yes, the MAX1259EWE+ supports supercapacitors (e.g., 0.22F MAXCAP) as backup sources, as explicitly shown in Figure 3 of the datasheet. Its VBATT input accepts 2.5V–3.7V, matching typical supercapacitor discharge curves. The device's 15mA battery-mode output current and ≤200mV switch drop ensure efficient energy transfer during short-term backup. Internal hysteresis prevents oscillation during gradual capacitor discharge. No additional external circuitry is needed-only proper decoupling per the Applications Information section. This capability makes the MAX1259EWE+ suitable for maintenance-free, capacitor-based backup where battery replacement is impractical.
Is the MAX1259EWE+ pin-compatible with other variants in the MAX1259 family?
Yes, the MAX1259EWE+ shares identical pinout and function mapping with all 16-pin SO and PDIP variants of the MAX1259 family, including MAX1259CWE+, MAX1259EPE, and MAX1259MJE. Pin assignments-such as VCCI on pins 15/16, VCCO on pins 12/13, and BF on pin 3-are consistent across grades. This allows direct substitution between temperature grades without PCB redesign. However, electrical parameters differ: E-grade specifies 150nA max battery leakage (vs. 100nA for C-grade and 10µA for M-grade), and extended temperature operation. The MAX1259EWE+ maintains full functional and mechanical compatibility while delivering optimized performance for industrial applications.
MAX1259EWE+ 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:
- Obsolete
- Function:
- Power Management
- Battery Chemistry:
- -
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX1259EWE+ FAQ
1.How can I place an order for MAX1259EWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1259EWE+ 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 MAX1259EWE+ reliable?
The price and inventory of MAX1259EWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1259EWE+ is usually 5 days.
3.What payment methods are accepted for MAX1259EWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1259EWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1259EWE+?
MAX1259EWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1259EWE+ 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 MAX1259EWE+?
For technical support, including MAX1259EWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1259EWE+ requirements.
6.How does Aetrix verify that MAX1259EWE+ is sourced from the original manufacturer or authorized distributors?
All MAX1259EWE+ 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 MAX1259EWE+ meets industry standards.
7.What is the process for return or replacement of MAX1259EWE+?
All MAX1259EWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1259EWE+, 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 MAX1259EWE+ part is unused and in its original packaging.
Return procedure for MAX1259EWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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