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Analog Devices Inc./Maxim Integrated MAX1976EZT285+
- Part No.:
- MAX1976EZT285+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MAX1976EZT285+.pdf
- Description:
- IC REG LINEAR 300MA LDO REG
- Quantity:
- Payment:
- Shipping:
Inventory:4,307
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Product details
Overview
MAX1976EZT285+ from Maxim Integrated is a low-dropout linear regulator (LDO) with integrated active-low reset output, designed for battery-powered portable electronics. It delivers 300mA continuous output current with ±0.5% output voltage accuracy at 2.85V, 100mV dropout at full load, and operates from a 1.62V–3.6V input supply - enabling use in single-cell Li-ion or multi-cell alkaline systems.
For engineers reviewing the MAX1976EZT285+ datasheet, MAX1976EZT285+ pinout, MAX1976EZT285+ application, or MAX1976EZT285+ equivalent, key selection criteria include guaranteed 300mA output under low-input conditions, 70ms reset delay timing, thermal-overload protection, logic-controlled shutdown, and compatibility with compact 6-pin thin SOT23 packaging.
Technical Context
The MAX1976EZT285+ employs an internal P-channel MOSFET pass transistor (RDS(ON) = 0.33Ω) to achieve low dropout and supply-current independence from load or dropout voltage. Its error amplifier compares a trimmed bandgap reference against feedback from the internal voltage divider to regulate the 2.85V output.
Reset functionality is implemented via a dedicated comparator monitoring VOUT; RESET asserts when output falls below 82.5% of nominal (2.35V) and remains asserted for ≥70ms after regulation is achieved. Shutdown is controlled by an active-low SHDN pin with <1µA off-state current and 90µs turn-on delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.85V fixed - internally trimmed, no external resistors required; enables stable core or I/O rail generation in space-constrained designs. |
| Max Output Current | 300mA continuous - sufficient for powering baseband processors, RF transceivers, or display drivers in handheld devices. |
| Dropout Voltage | 100mV at 300mA - allows operation down to ~2.75V input with 2.85V output, extending usable battery life in Li-ion discharge profiles. |
| Output Accuracy | ±0.5% over load/line/temp - ensures reliable voltage margining for sensitive digital loads without external calibration. |
| RESET Delay | 70ms (typ), 100ms (max) - meets microprocessor power-on reset timing requirements for ARM Cortex-M or similar SoCs. |
| Quiescent Current | 90µA (typ) at 300mA load - maintains ultra-low standby consumption even under heavy load, critical for always-on subsystems. |
| Input Voltage Range | 1.62V to 3.6V - supports direct connection to single-cell Li-ion (2.7–4.2V) or two/three-cell alkaline/NiMH batteries. |
Pinout & Package
MAX1976EZT285+ is housed in a RoHS-compliant 6-pin thin SOT23 package (Z6-1 footprint), height <1.1mm, suitable for high-density PCB layouts. Thermal performance is enhanced by soldering Pin 2 (GND) to a large copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator Input | Accepts 1.62V–3.6V supply; requires ≥1µF ceramic bypass to GND for stability and noise suppression. |
| 2 (GND) | Ground / Thermal Pad | Primary ground return and heatsink; must be connected to large PCB copper area to sustain 300mA continuous operation. |
| 3 (SHDN) | Active-Low Shutdown Control | Pull low to reduce quiescent current to <1µA; compatible with 1.62V–3.6V logic levels and draws <5nA bias current. |
| 4 (RESET) | Open-Drain Reset Output | Asserts low during power-up/brownout; releases after ≥70ms once VOUT ≥ 2.35V; requires external pull-up for µP interface. |
| 5 (I.C.) | Internally Connected | No external connection required; leave floating or tie to GND per layout best practice. |
| 6 (OUT) | Regulated Output | Delivers 2.85V @ 300mA; requires 4.7µF low-ESR ceramic capacitor to GND for transient response and PSRR optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Low 1.62V minimum input | Enables direct regulation from partially discharged Li-ion cells (down to ~2.75V) without intermediate buck stage. |
| 70ms reset delay | Guarantees sufficient hold-off time for microcontroller initialization before releasing reset, eliminating need for external RC timing. |
| Thermal-overload protection | Shuts down pass transistor at +165°C junction temperature with 15°C hysteresis, preventing permanent damage during overload or poor heatsinking. |
| Logic-controlled shutdown | Reduces total system standby current to sub-µA level, supporting long-term battery retention in IoT sensors or wearables. |
| Supply current independence | Ground current remains ~90µA regardless of load or dropout condition - simplifies battery life estimation and eliminates load-dependent leakage. |
Applications
| Smartphone Baseband Power | Digital Camera Sensor Rail |
|---|---|
|
Use Scenario: Powering application processor I/O banks or modem subsystems in smartphones operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary 2.85V LDO with integrated reset, providing clean, regulated voltage and synchronized power-on sequencing. Use Value: Eliminates need for discrete reset IC and reduces BOM count; 100mV dropout extends runtime by >15 minutes at end-of-discharge. |
Use Scenario: Supplying image sensor analog front-end (AFE) or ISP core logic requiring tight voltage tolerance and fast transient response. IC Role / Device Role / Timing Role: Low-noise 2.85V regulator with 86µVRMS output noise and 70dB PSRR at 1kHz, ensuring minimal image artifacts. Use Value: Maintains SNR integrity during burst capture; 4.7µF output capacitor ensures <20mV load-step deviation (20mA→200mA). |
| PCMCIA Card Interface | Handheld Medical Monitor |
|
Use Scenario: Regulating 2.85V for PCMCIA/CardBus controller logic and interface buffers in portable data acquisition modules. IC Role / Device Role / Timing Role: Hot-swap capable LDO with active-low RESET and SHDN, enabling safe insertion/removal under live power. Use Value: Internal 1.5kΩ pull-down on OUT during shutdown prevents backfeeding; RESET flag confirms stable rail before host enumeration. |
Use Scenario: Powering low-power MCU and analog signal chain in battery-operated ECG or pulse oximeter devices. IC Role / Device Role / Timing Role: Safety-critical 2.85V supply with thermal shutdown and brownout detection, meeting IEC 60601-1 auxiliary power requirements. Use Value: ±0.5% accuracy ensures consistent ADC reference scaling; 70ms reset guarantees deterministic boot after battery insertion or recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1976ETT285+ | Same electrical specs and reset timing, but in 3mm × 3mm TDFN package (T633-2); 0.8mm height, higher thermal dissipation (1951mW vs. 727mW). | Better suited for thermally constrained designs needing >300mA sustained output or higher ambient temperatures. | Select MAX1976ETT285+ when board space allows larger footprint and thermal management requires lower junction rise. |
| Torex XC6219B285MR-G | 2.85V fixed LDO; 200mA max output, 150mV dropout at 200mA, 70ms reset delay, SOT-25 package (5-pin, no I.C. pin). | Limited to lower current loads; lacks I.C. pin and has reduced PSRR (60dB vs. 70dB); no thermal shutdown hysteresis spec. | Choose XC6219B285MR-G only for cost-sensitive, low-current (<200mA), non-thermal-critical applications where pin count reduction is prioritized. |
Compared with MAX1976ETT285+, the MAX1976EZT285+ trades thermal headroom for ultra-thin profile; versus XC6219B285MR-G, it delivers 50% higher current, tighter accuracy, and robust thermal protection - making it optimal for compact, high-reliability portable systems.
Availability
MAX1976EZT285+ is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and handheld medical monitors requiring stable component supply across extended production lifecycles.
Supply support for MAX1976EZT285+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX1963/MAX1976 product line was engineered for ultra-low-voltage, high-accuracy regulation in space- and power-constrained portable electronics - emphasizing minimal dropout, integrated supervision, and robust fault protection.
FAQ
What is the output voltage tolerance of the MAX1976EZT285+ over temperature and load?
The MAX1976EZT285+ guarantees ±0.5% output voltage accuracy across -40°C to +85°C, 1mA to 300mA load, and 1.8V to 3.6V input range. This specification is verified in production testing and reflects worst-case deviation - not typical behavior - ensuring design margin for precision analog or digital rails.
Does the MAX1976EZT285+ require external components for stable operation?
Yes, the MAX1976EZT285+ requires a 1µF ceramic capacitor between IN and GND, and a 4.7µF low-ESR (≤30mΩ) ceramic capacitor between OUT and GND. These are mandatory for stability, transient response, and PSRR performance - omitting either risks oscillation or excessive output ripple.
How does the RESET output behave during shutdown or brownout?
During shutdown (SHDN = GND), the MAX1976EZT285+ actively pulls RESET low. During brownout (VOUT falling below 82.5% of 2.85V ≈ 2.35V), RESET also asserts low immediately and remains low until VOUT rises above threshold and sustains regulation for ≥70ms - ensuring reliable µP reset under all fault conditions.
Can the MAX1976EZT285+ operate from a 1.8V input while delivering 2.85V output?
No - the MAX1976EZT285+ cannot regulate 2.85V output from a 1.8V input. Its minimum input is defined by VOUT + dropout; with 100mV dropout at full load, the absolute minimum input is 2.95V. At lighter loads, dropout decreases, but 1.8V is below the 1.62V absolute minimum input rating and will not power the device.
What thermal limitations apply to the MAX1976EZT285+ in the thin SOT23 package?
In the thin SOT23 package, the MAX1976EZT285+ has a maximum power dissipation of 727mW at +70°C ambient. With a 2.85V output and 3.6V input, the worst-case power loss is (3.6V − 2.85V) × 300mA = 225mW - well within limits if GND pin is properly heatsunk. Derating begins above +70°C at 9.1mW/°C.
MAX1976EZT285+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 3.6V
- Voltage - Output (Min/Fixed):
- 2.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.2V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 140 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (1kHz)
- Control Features:
- Enable, Reset
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
MAX1976EZT285+ FAQ
1.How can I place an order for MAX1976EZT285+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1976EZT285+ 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 MAX1976EZT285+ reliable?
The price and inventory of MAX1976EZT285+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1976EZT285+ is usually 5 days.
3.What payment methods are accepted for MAX1976EZT285+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1976EZT285+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1976EZT285+?
MAX1976EZT285+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1976EZT285+ 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 MAX1976EZT285+?
For technical support, including MAX1976EZT285+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1976EZT285+ requirements.
6.How does Aetrix verify that MAX1976EZT285+ is sourced from the original manufacturer or authorized distributors?
All MAX1976EZT285+ 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 MAX1976EZT285+ meets industry standards.
7.What is the process for return or replacement of MAX1976EZT285+?
All MAX1976EZT285+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1976EZT285+, 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 MAX1976EZT285+ part is unused and in its original packaging.
Return procedure for MAX1976EZT285+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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