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Analog Devices Inc./Maxim Integrated MAX1976AEZT285+T
- Part No.:
- MAX1976AEZT285+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MAX1976AEZT285+T.pdf
- Description:
- IC REG LIN 2.85V 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
MAX1976AEZT285+T from Maxim Integrated is a low-dropout linear regulator with preset 2.85V output, delivering guaranteed 300mA continuous current from 1.62V–3.6V input, featuring 100mV dropout at full load and active-low open-drain RESET with 70ms delay-designed for power management in space-constrained portable electronics such as smartphones and DSCs.
For engineers reviewing the MAX1976AEZT285+T datasheet, MAX1976AEZT285+T pinout, MAX1976AEZT285+T application, or MAX1976AEZT285+T equivalent, key selection criteria include input voltage range (1.62V–3.6V), ±0.5% output accuracy over temperature, thermal shutdown at +165°C, and compatibility with 1µF/4.7µF ceramic bypass capacitors for stable operation.
Technical Context
The MAX1976AEZT285+T integrates a p-channel MOSFET pass transistor (RDS(ON) = 0.33Ω) enabling load-independent quiescent current (90µA typ) and low dropout performance. Its internal error amplifier compares feedback against a precision reference to regulate output voltage across line, load, and temperature variations.
RESET functionality uses a dedicated comparator monitoring VOUT, asserting low when output falls below 82.5% of nominal value and holding for ≥70ms after regulation is achieved. Shutdown control via SHDN pin reduces supply current to <1µA while actively pulling OUT to GND through a 1.5kΩ resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.85V preset, trimmed internally-no external resistors required for regulation. |
| Max Output Current | 300mA continuous-supports core logic rails in handheld devices without derating at +70°C in SOT23 package. |
| Dropout Voltage | 100mV at 300mA-enables operation down to 2.95V input for 2.85V rail, extending battery life in Li-ion systems. |
| Output Accuracy | ±0.5% at +25°C, ±2.5% over -40°C to +85°C-ensures reliable microprocessor core voltage compliance. |
| RESET Delay | 70ms minimum after VOUT reaches regulation-meets boot sequencing requirements for ARM-based SoCs. |
| Quiescent Current | 90µA typical at full load-remains constant regardless of dropout or load, critical for standby power budgeting. |
| Thermal Shutdown | +165°C activation with 15°C hysteresis-prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
MAX1976AEZT285+T is housed in a 6-pin thin SOT23-6 package (1.6mm × 2.9mm × 1.1mm), optimized for high-density PCB layouts in portable equipment. The exposed pad is not present in this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply connection | Accepts 1.62V–3.6V; requires ≥1µF ceramic capacitor to GND for stability and noise suppression. |
| 2 (GND) | Power ground reference | Serves as thermal path; must connect to large copper area to sustain 300mA under worst-case thermal conditions. |
| 3 (SHDN) | Active-low shutdown control | Pull low to disable regulator, reduce IQ to <1µA, and force OUT to GND via internal 1.5kΩ resistor. |
| 4 (RESET) | Open-drain reset flag output | Asserts low during power-up/brownout; rises 70ms after VOUT ≥ 2.85V × 0.825 = 2.351V. |
| 5 (I.C.) | Internally connected node | No external connection required; leave floating or tie to GND per layout best practice. |
| 6 (OUT) | Regulated output terminal | Delivers up to 300mA; requires ≥4.7µF low-ESR ceramic capacitor to GND for transient response and PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| pMOS pass transistor | RDS(ON) = 0.33Ω enables 100mV dropout at 300mA and eliminates base-drive current loss seen in PNP regulators. |
| Load-independent quiescent current | 90µA typical remains fixed across 0–300mA load and all dropout conditions-simplifies battery life estimation. |
| Reset threshold accuracy | 82.5% of VOUT (±2.5%) ensures deterministic system reset timing independent of output tolerance drift. |
| Thermal-overload protection | Hysteretic shutdown at +165°C prevents thermal runaway during sustained short-circuit or high ambient conditions. |
| Logic-controlled shutdown | SHDN pin accepts 0.6V/1.4V logic thresholds compatible with 1.8V/3.3V I/O domains without level-shifting. |
Applications
| Smartphone Core Power | Digital Still Camera (DSC) Sensor Bias |
|---|---|
|
Use Scenario: Powers application processor core voltage (e.g., ARM Cortex-A series) in battery-operated smartphones with tight input voltage headroom. IC Role / Device Role / Timing Role: Primary LDO providing stable 2.85V rail; RESET signals boot ROM initialization sequence after power stabilization. Use Value: 100mV dropout extends usable battery range by ~120mV compared to legacy 200mV-dropout regulators, delaying brownout shutdown. |
Use Scenario: Supplies bias voltage to CMOS image sensor analog front-end in compact DSCs where board space limits capacitor count. IC Role / Device Role / Timing Role: Low-noise 2.85V source with 86µVRMS output noise; RESET coordinates sensor initialization with main SoC boot. Use Value: 1µF/4.7µF ceramic-only BOM eliminates tantalum capacitors, reducing cost and improving reliability in consumer-grade cameras. |
| PCMCIA Card Interface Rail | Handheld Medical Monitor Display Driver |
|
Use Scenario: Generates 2.85V interface voltage for PCMCIA/CardBus peripherals operating from variable host supply (e.g., 3.3V ±10%). IC Role / Device Role / Timing Role: Input-supply tolerant LDO with 1.62V min VIN; RESET flags card insertion/removal events to host controller. Use Value: ±2.5% total accuracy over temperature ensures consistent signal integrity across -40°C to +85°C industrial operating range. |
Use Scenario: Powers TFT-LCD display driver IC in portable ECG or pulse oximeter units requiring low EMI and predictable startup behavior. IC Role / Device Role / Timing Role: Low-PSRR (70dB @ <1kHz) regulator with fast line-transient response (<10mV deviation); RESET synchronizes display enable with system boot. Use Value: 70ms RESET delay matches typical display controller power-on reset timing, eliminating need for external RC timing networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B285MR-G | 2.85V fixed output, 200mA max, 150mV dropout at 200mA, no RESET output | Lacks integrated reset function; requires external supervisor for power sequencing | Select when RESET is handled separately and lower cost outweighs reduced integration. |
| Analog Devices ADP125ARHZ-2.85-R7 | 2.85V fixed output, 500mA max, 135mV dropout at 500mA, no RESET, higher IQ (120µA) | Higher current capability but no reset flag; different pinout (SOT23-5 vs SOT23-6) | Choose for higher load margin where board redesign accommodates 5-pin footprint and external reset logic. |
Compared with MAX1976AEZT285+T, XC6219B285MR-G trades integrated RESET for lower unit cost and smaller solution size, while ADP125ARHZ-2.85-R7 offers greater current headroom at the expense of missing power-good signaling and increased quiescent consumption.
Availability
MAX1976AEZT285+T is available at Aetrix Electronics and suitable for smartphone power management, digital camera sensor biasing, PCMCIA interface regulation, and handheld medical monitor applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1976AEZT285+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, communications, and consumer applications.
The MAX1963A/MAX1976A product line delivers ultra-low-input-voltage LDOs with integrated RESET for battery-powered portable electronics where minimal dropout, tight accuracy, and power sequencing are critical.
FAQ
What is the exact output voltage of MAX1976AEZT285+T?
The MAX1976AEZT285+T has a factory-trimmed fixed output voltage of 2.85V. This value is confirmed in the Selector Guide (page 9) and Electrical Characteristics table (page 2), where "285" in the part number suffix directly maps to 2.85V. Output accuracy is ±0.5% at +25°C and ±2.5% over the full -40°C to +85°C operating range.
Does MAX1976AEZT285+T require external resistors to set the output voltage?
No, MAX1976AEZT285+T does not require external resistors. It is a fixed-output LDO with the 2.85V regulation voltage internally trimmed during manufacturing, as stated in the General Description and Selector Guide. The device uses an internal feedback divider, eliminating the need for external components and reducing BOM count and layout area.
What is the RESET delay time for MAX1976AEZT285+T and how is it triggered?
The MAX1976AEZT285+T provides a guaranteed RESET delay of 70ms (minimum) after the output voltage reaches regulation. RESET is asserted low during power-up until VOUT exceeds 82.5% of nominal (2.351V), then remains low for ≥70ms before releasing. It reasserts immediately if VOUT drops below that threshold or during shutdown.
Can MAX1976AEZT285+T operate from a single-cell Li-ion battery?
Yes, MAX1976AEZT285+T supports input voltages from 1.62V to 3.6V, making it compatible with single-cell Li-ion batteries (2.7V–4.2V). Its 100mV dropout allows regulation down to 2.95V input for the 2.85V output, covering >90% of the battery's discharge curve without brownout-confirmed in the Typical Operating Characteristics (Figure 2).
What package type and dimensions does MAX1976AEZT285+T use?
MAX1976AEZT285+T uses the 6-pin thin SOT23-6 package (package code Z6+1), measuring 1.6mm × 2.9mm × 1.1mm. Pin configuration matches the standard MAX1976A top view: IN (1), GND (2), SHDN (3), RESET (4), I.C. (5), OUT (6). Land pattern number 90-0242 applies per Maxim's package documentation.
MAX1976AEZT285+T 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:
- Obsolete
- 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):
- 90 µA
- 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
MAX1976AEZT285+T FAQ
1.How can I place an order for MAX1976AEZT285+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1976AEZT285+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 MAX1976AEZT285+T reliable?
The price and inventory of MAX1976AEZT285+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1976AEZT285+T is usually 5 days.
3.What payment methods are accepted for MAX1976AEZT285+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1976AEZT285+T transactions.
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4.How is shipping managed for MAX1976AEZT285+T?
MAX1976AEZT285+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1976AEZT285+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 MAX1976AEZT285+T?
For technical support, including MAX1976AEZT285+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1976AEZT285+T requirements.
6.How does Aetrix verify that MAX1976AEZT285+T is sourced from the original manufacturer or authorized distributors?
All MAX1976AEZT285+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 MAX1976AEZT285+T meets industry standards.
7.What is the process for return or replacement of MAX1976AEZT285+T?
All MAX1976AEZT285+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1976AEZT285+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 MAX1976AEZT285+T part is unused and in its original packaging.
Return procedure for MAX1976AEZT285+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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