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Analog Devices Inc./Maxim Integrated MAX1589AEZT250+T
- Part No.:
- MAX1589AEZT250+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MAX1589AEZT250+T.pdf
- Description:
- IC REG LIN 2.5V 500MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,910
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Product details
Overview
MAX1589AEZT250+T from Maxim Integrated is a low-dropout linear regulator with preset 2.5V output, delivering guaranteed 500mA continuous current from 1.62V–3.6V input, featuring ±0.5% initial accuracy, 175mV dropout at full load, and active-low open-drain RESET output asserted for ≥70ms after regulation-used in notebook computers, digital still cameras, and cellular handsets for core voltage regulation.
For engineers reviewing the MAX1589AEZT250+T datasheet, MAX1589AEZT250+T pinout, MAX1589AEZT250+T application, or MAX1589AEZT250+T equivalent, key selection criteria include input voltage headroom down to 1.62V, thermal-overload and short-circuit protection, logic-controlled shutdown, ground current independence from load/dropout, and compatibility with 1µF input / 4.7µF low-ESR ceramic output capacitors.
Technical Context
The MAX1589AEZT250+T employs an internal p-channel MOSFET pass transistor (RDS(ON) = 0.33Ω) enabling low quiescent current (90µA typ at 500mA) independent of load and dropout voltage. Its error amplifier compares a precision bandgap reference against internal feedback to regulate output voltage.
RESET functionality uses a power-good comparator monitoring VOUT; it asserts low when VOUT falls below 82.5% of nominal and remains asserted ≥70ms after recovery. Shutdown disconnects OUT from IN, pulls OUT to GND via 1.5kΩ, and reduces supply current to <1µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V - no external resistors required; matches common I/O or core rail requirements. |
| Max Output Current | 500mA continuous - supports moderate-power processors, memory, and peripherals in portable systems. |
| Dropout Voltage | 175mV at 500mA - enables operation down to ~2.675V input for 2.5V output, extending battery life in Li-ion/Li-poly systems. |
| Output Accuracy | ±0.5% initial tolerance - ensures reliable logic-level compliance and stable ADC reference supply. |
| RESET Delay | 70ms minimum assertion time - meets microprocessor reset timing requirements for clean boot sequencing. |
| Quiescent Current | 90µA typical at full load - minimizes standby power loss without sacrificing regulation performance. |
| Input Voltage Range | 1.62V to 3.6V - compatible with single-cell Li-ion (2.7–4.2V), LiFePO₄ (2.0–3.6V), and regulated 3.3V/2.5V rails. |
Pinout & Package
MAX1589AEZT250+T is packaged in a 6-pin thin SOT23-6 (1.1mm height) with exposed pad not present; pin 1 is IN, pin 2 is GND, pin 3 is SHDN, pin 4 is RESET, pin 5 is I.C. (internally connected, float or tie to GND), and pin 6 is OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator input supply | Accepts 1.62V–3.6V; requires ≥1µF ceramic bypass to GND close to pin for stability. |
| 2 (GND) | Power and signal ground | Serves as thermal path; must connect to large copper area to manage 727mW max dissipation at +70°C. |
| 3 (SHDN) | Active-low enable control | Pull low to disable regulator; draws <1µA in shutdown; internal pull-up not provided. |
| 4 (RESET) | Open-drain reset flag | Asserts low during power-up/brownout; rises 100ms after VOUT reaches regulation; requires external pull-up. |
| 5 (I.C.) | Internally connected node | No external connection required; may be left floating or tied to GND per layout best practice. |
| 6 (OUT) | Regulated output | Delivers up to 500mA; requires 4.7µF low-ESR ceramic capacitor to GND for transient response and stability. |
Key Features
| Feature | Design Value |
|---|---|
| pMOS pass transistor | Eliminates base-drive current; enables 90µA quiescent current at 500mA load and maintains low IQ in dropout. |
| Logic-controlled shutdown | Reduces total supply current to <1µA and actively discharges OUT via 1.5kΩ resistor for fast turn-off. |
| Thermal-overload protection | Shuts down pass transistor at +165°C junction temperature; restarts after 15°C hysteresis for fault-safe operation. |
| Short-circuit protection | Limits output current to 850mA typ; prevents damage during sustained overload or output-to-ground faults. |
| Reset threshold accuracy | 82.5% of VOUT nominal with 1.7% hysteresis - ensures robust brownout detection without chatter. |
Applications
| Smartphone Baseband Power | Digital Still Camera Core Rail |
|---|---|
Use Scenario: Powers baseband processor core in dual-SIM smartphones operating from single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary 2.5V LDO supplying CPU core; provides RESET signal for SoC initialization sequence. Use Value: 175mV dropout extends usable battery range to ~2.675V, while ±0.5% accuracy ensures stable core voltage across temperature and load. |
Use Scenario: Supplies image sensor and ISP core in compact digital still cameras with tight board space. IC Role / Device Role / Timing Role: Fixed-output LDO with integrated RESET for deterministic boot; supports rapid on/off cycling. Use Value: 90µA quiescent current minimizes standby drain; 500mA capability handles burst-mode sensor readout without droop. |
| Notebook Platform I/O Rail | PCMCIA Card Interface Regulator |
Use Scenario: Generates 2.5V I/O supply for embedded controller and touchpad interface in ultra-thin notebooks. IC Role / Device Role / Timing Role: Secondary LDO with RESET used for peripheral power sequencing and fault reporting. Use Value: 1.62V min input allows direct connection to buck-boost converter output; RESET flag synchronizes firmware initialization. |
Use Scenario: Provides regulated 2.5V to PCMCIA Type II card slot in industrial handheld terminals. IC Role / Device Role / Timing Role: Hot-swap capable LDO with shutdown control and RESET for card presence detection and safe insertion. Use Value: Logic-controlled SHDN enables dynamic power gating; thermal protection prevents overheating during high-current card operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS79525DBVR | 2.5V fixed, 500mA, 160mV dropout at 500mA, but requires ≥2.7V input; no integrated RESET output. | Lacks built-in RESET - external supervisor IC needed for power-on reset; better suited where input >2.7V is guaranteed. | Select when higher input voltage simplifies system design and RESET can be added externally. |
| MCP1825-2502E/DB | 2.5V fixed, 500mA, 250mV dropout at 500mA, ±2% accuracy, no RESET, 1.7V min input. | Lower accuracy and no RESET limit use in precision or sequenced systems; wider dropout reduces battery runtime. | Choose only for cost-sensitive, non-critical applications where RESET and tight accuracy are unnecessary. |
Compared with TPS79525DBVR and MCP1825-2502E/DB, the MAX1589AEZT250+T uniquely combines 1.62V minimum input, ±0.5% accuracy, integrated RESET, and 175mV dropout-enabling longer battery life and simpler BOM in space-constrained portable designs.
Availability
MAX1589AEZT250+T is available at Aetrix Electronics and suitable for notebook computers, digital still cameras, and cellular handsets requiring stable component supply, long-term lifecycle support, and lead-free packaging compliance.
Supply support for MAX1589AEZT250+T 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 demanding industrial, automotive, and portable applications.
The MAX1589A product line delivers low-input-voltage, high-accuracy LDO regulators with integrated RESET for battery-powered systems where minimal dropout, low quiescent current, and reliable power sequencing are critical.
FAQ
What is the exact output voltage of the MAX1589AEZT250+T?
The MAX1589AEZT250+T has a factory-trimmed fixed output voltage of 2.5V with ±0.5% initial accuracy over temperature and load. This value is confirmed in the Selector Guide (suffix "250") and Electrical Characteristics table under Output Voltage Accuracy, and does not require external resistors or configuration.
Does the MAX1589AEZT250+T include thermal protection?
Yes, the MAX1589AEZT250+T incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C. It automatically recovers after cooling by 15°C, providing pulsed output during sustained overload-verified in the Thermal Protection section of the datasheet with measured TSHDN and ΔTSHDN values.
Can the MAX1589AEZT250+T operate from a single Li-ion cell?
Yes, the MAX1589AEZT250+T supports input voltages as low as 1.62V, making it compatible with discharged single-cell Li-ion batteries (down to ~2.7V nominal, ~2.5V under load). Its 175mV dropout at 500mA ensures regulation remains active until input drops to ~2.675V for 2.5V output.
What capacitor values are required for stable operation of the MAX1589AEZT250+T?
The MAX1589AEZT250+T requires a minimum 1µF ceramic capacitor between IN and GND, and a 4.7µF low-ESR (≤30mΩ) ceramic capacitor between OUT and GND. These values are specified in the Applications Information section and validated across temperature and load for stability, noise suppression, and transient response.
Is the I.C. pin on the MAX1589AEZT250+T functional or unused?
The I.C. pin (pin 5) on the MAX1589AEZT250+T is internally connected and has no external function. The datasheet explicitly states it may be left floating or tied to GND-no current flows through it, and it does not affect regulation, RESET, or shutdown behavior of the MAX1589AEZT250+T.
MAX1589AEZT250+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 3.6V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.35V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 140 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (1kHz)
- Control Features:
- Enable, Reset
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
MAX1589AEZT250+T FAQ
1.How can I place an order for MAX1589AEZT250+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1589AEZT250+T 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 MAX1589AEZT250+T reliable?
The price and inventory of MAX1589AEZT250+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1589AEZT250+T is usually 5 days.
3.What payment methods are accepted for MAX1589AEZT250+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1589AEZT250+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1589AEZT250+T?
MAX1589AEZT250+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1589AEZT250+T 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 MAX1589AEZT250+T?
For technical support, including MAX1589AEZT250+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1589AEZT250+T requirements.
6.How does Aetrix verify that MAX1589AEZT250+T is sourced from the original manufacturer or authorized distributors?
All MAX1589AEZT250+T 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 MAX1589AEZT250+T meets industry standards.
7.What is the process for return or replacement of MAX1589AEZT250+T?
All MAX1589AEZT250+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1589AEZT250+T, 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 MAX1589AEZT250+T part is unused and in its original packaging.
Return procedure for MAX1589AEZT250+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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