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Analog Devices Inc./Maxim Integrated MAX1976EZT180+T
- Part No.:
- MAX1976EZT180+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MAX1976EZT180+T.pdf
- Description:
- IC REG LINEAR 300MA LDO REG
- Quantity:
- Payment:
- Shipping:
Inventory:32,500
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Product details
Overview
MAX1976EZT180+T from Maxim Integrated is a low-dropout linear regulator delivering 300mA continuous output current with 100mV dropout at full load, ±0.5% output voltage accuracy, and a fixed 1.80V output. It features an active-low open-drain RESET output with 70ms delay, operates from 1.62V to 3.6V input, and is designed for space-constrained portable power rails in notebook computers and handheld devices.
For engineers reviewing the MAX1976EZT180+T datasheet, MAX1976EZT180+T pinout, MAX1976EZT180+T application, or MAX1976EZT180+T equivalent, key selection criteria include guaranteed 300mA load capability under low-input-voltage conditions (≥1.62V), precise 1.80V regulation with ±0.5% accuracy over temperature/load/line, integrated reset timing (70ms), thermal and short-circuit protection, and compatibility with 1µF/4.7µF ceramic bypass capacitors.
Technical Context
The MAX1976EZT180+T uses an internal P-channel MOSFET pass transistor (RDS(ON) = 0.33Ω) enabling supply current independence from load and dropout voltage - critical for battery life in portable systems. Its error amplifier compares a trimmed bandgap reference against a resistive feedback network to regulate the 1.80V output with high DC accuracy.
RESET functionality is implemented via a dedicated comparator monitoring VOUT, asserting low when output falls below 82.5% of nominal (1.485V) and holding for ≥70ms after regulation is achieved. Shutdown is logic-controlled (active-low SHDN), reducing quiescent current to <1µA while pulling OUT to GND via a 1.5kΩ internal resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.80V - precisely trimmed during production; supports core logic and memory rails requiring stable low-voltage bias. |
| Max Output Current | 300mA continuous - sufficient for microcontroller I/O banks or FPGA auxiliary supplies without external boost. |
| Dropout Voltage | 100mV at 300mA - enables operation down to 1.90V input, extending usable battery range in single-cell Li-ion or Li-poly systems. |
| Output Accuracy | ±0.5% over load/line/temp - ensures compliance with tight tolerance requirements for 1.8V digital interfaces (e.g., SDIO, USB PHY). |
| RESET Delay | 70ms (min) - meets JEDEC JESD84-A44B power-on reset timing for embedded controllers and baseband processors. |
| Quiescent Current | 90µA typical at 300mA load - remains constant across dropout, minimizing standby power loss in always-on subsystems. |
| Input Voltage Range | 1.62V to 3.6V - supports direct connection to partially discharged Li-ion cells (≥3.0V) and regulated intermediate rails. |
Pinout & Package
MAX1976EZT180+T is housed in a 6-pin thin SOT23 package (Z6-1), 2.9mm × 2.8mm × 1.1mm, with exposed die 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, leave floating or tie to GND); Pin 6 is OUT.
| 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 reference and thermal path | Serves as primary return and heatsink; must connect to large PCB copper area to sustain 300mA continuous operation. |
| 3 (SHDN) | Active-low shutdown control | Pull low to disable regulator and reduce IQ to <1µA; internal pull-up not provided - external logic or resistor required. |
| 4 (RESET) | Open-drain reset flag | Asserts low during power-up/brownout; rises 70ms after VOUT ≥ 1.485V; requires external pull-up for MCU interface. |
| 5 (I.C.) | Internally connected node | No external connection needed; may be left floating or tied to GND per layout best practice to reduce noise coupling. |
| 6 (OUT) | Regulated output | Delivers 1.80V @ up to 300mA; requires 4.7µF low-ESR ceramic capacitor to GND for transient response and PSRR optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Low-input-voltage operation | Starts regulation at 1.62V input - enables use with single-cell batteries down to ~3.2V pack voltage before cutoff. |
| P-channel MOSFET pass element | RDS(ON) = 0.33Ω - eliminates base-drive current, ensuring 90µA quiescent current regardless of load or dropout condition. |
| Integrated reset supervisor | 70ms delay with 82.5% threshold - provides deterministic power-on sequencing without external RC timing components. |
| Thermal and short-circuit protection | Shuts down at +165°C junction temp with 15°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Stable with small ceramic capacitors | Works with 1µF CIN and 4.7µF COUT (ESR ≤30mΩ) - reduces BOM count and board area vs. tantalum-based LDO solutions. |
Applications
| Mobile Baseband Power | Notebook CPU I/O Rail |
|---|---|
|
Use Scenario: Powers RF transceiver analog front-end and digital baseband logic in 4G/LTE smartphones. IC Role / Device Role / Timing Role: Primary 1.8V LDO supplying sensitive RF circuitry and serial interface blocks. Use Value: Low 100mV dropout extends talk time by maintaining regulation until battery reaches 1.90V; ±0.5% accuracy prevents data corruption on high-speed MIPI D-PHY links. |
Use Scenario: Supplies 1.8V I/O voltage for Intel/AMD mobile CPUs and chipset companion ICs. IC Role / Device Role / Timing Role: Secondary regulated rail decoupled from main VRM, providing clean, low-noise bias for PCIe and SATA interfaces. Use Value: 86µVRMS output noise and 70dB PSRR at 1kHz ensure signal integrity on high-speed differential buses; RESET synchronizes firmware initialization. |
| Digital Camera Sensor Bias | PCMCIA Card Core Logic |
|
Use Scenario: Provides stable 1.8V supply to CMOS image sensor digital backend and ADC driver stages. IC Role / Device Role / Timing Role: Precision analog/digital co-rail regulator with fast load-transient response (20mV overshoot for 20mA→200mA step). Use Value: 20µs load-step response and low ground-current variation (<10µA shift from 0–300mA) minimize image artifacts during auto-exposure bursts. |
Use Scenario: Powers 1.8V core logic of legacy PCMCIA/ExpressCard peripherals in industrial laptops. IC Role / Device Role / Timing Role: Hot-swap compatible LDO with controlled turn-on delay (90µs) and logic-level SHDN for card-detect sequencing. Use Value: Active-low SHDN allows host controller to disable rail before card ejection; RESET ensures proper state recovery after hot-insertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B182MR-G | 1.8V fixed output, 300mA, 150mV dropout at 300mA, no RESET output | Lacks integrated reset supervision - requires external reset IC or µC GPIO monitoring for power-on sequencing | Select when RESET is handled elsewhere and lowest possible cost is prioritized over integration. |
| Analog Devices ADP160ACBZ-1.8-R7 | 1.8V fixed output, 150mA max, 195mV dropout at 150mA, no RESET, 1.6V min input | Lower current rating and no reset function - unsuitable for 300mA loads or systems requiring guaranteed reset timing | Choose only for ultra-low-power sub-systems where 150mA suffices and reset is externally managed. |
Compared with MAX1976EZT180+T, the XC6219B182MR-G offers lower cost but forfeits reset integration, while the ADP160ACBZ-1.8-R7 lacks both current capacity and reset - making MAX1976EZT180+T the sole option among these three that delivers 300mA, 100mV dropout, and 70ms RESET in a single thin SOT23 package.
Availability
MAX1976EZT180+T is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and handheld computing devices requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MAX1976EZT180+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 MAX1963/MAX1976 product line targets battery-powered equipment needing high-accuracy, low-input-voltage LDOs with integrated power-good signaling - specifically optimized for PDAs, cell phones, and notebooks where size, efficiency, and sequencing reliability are critical.
FAQ
What is the output voltage tolerance of the MAX1976EZT180+T over temperature and load?
The MAX1976EZT180+T guarantees ±0.5% output voltage accuracy across -40°C to +85°C, 1mA to 300mA load, and 1.8V to 3.6V input voltage. This specification is production-tested at +25°C and ensured by design over the full operating range - critical for maintaining signal integrity in 1.8V digital interfaces like SDIO and USB PHY.
Does the MAX1976EZT180+T require external components for stable operation?
Yes, the MAX1976EZT180+T requires a 1µF ceramic capacitor between IN and GND, and a 4.7µF low-ESR ceramic capacitor between OUT and GND. These are mandatory for stability, transient response, and PSRR performance. The device is unstable with higher-ESR capacitors or missing bypass elements.
How does the RESET output behave during shutdown or brownout?
During shutdown (SHDN = GND), the RESET output is actively pulled low. During brownout (VOUT falling below 82.5% of 1.80V = 1.485V), RESET asserts low immediately and remains asserted until VOUT rises above 1.485V and holds for ≥70ms - ensuring reliable microprocessor reset under all fault conditions.
Can the MAX1976EZT180+T operate from a single-cell Li-ion battery?
Yes - the MAX1976EZT180+T operates from 1.62V to 3.6V input, supporting discharge down to ~1.90V (1.80V + 100mV dropout). This enables full utilization of a single-cell Li-ion battery (nominal 3.7V, cutoff ~3.0V), extending system runtime beyond regulators requiring higher minimum input.
What thermal considerations apply to the MAX1976EZT180+T in SOT23 package?
In the thin SOT23 package, MAX1976EZT180+T delivers 300mA only when (VIN – 1.80V) ≤ 2.0V at +70°C ambient. At +85°C, derating applies: maximum output current drops to ~220mA at 2.0V differential. PCB copper area connected to Pin 2 (GND) is essential for heat dissipation - insufficient copper causes thermal shutdown at ~165°C junction temperature.
MAX1976EZT180+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:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 3.6V
- Voltage - Output (Min/Fixed):
- 1.8V
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
MAX1976EZT180+T FAQ
1.How can I place an order for MAX1976EZT180+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1976EZT180+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 MAX1976EZT180+T reliable?
The price and inventory of MAX1976EZT180+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1976EZT180+T is usually 5 days.
3.What payment methods are accepted for MAX1976EZT180+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1976EZT180+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1976EZT180+T?
MAX1976EZT180+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1976EZT180+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 MAX1976EZT180+T?
For technical support, including MAX1976EZT180+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1976EZT180+T requirements.
6.How does Aetrix verify that MAX1976EZT180+T is sourced from the original manufacturer or authorized distributors?
All MAX1976EZT180+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 MAX1976EZT180+T meets industry standards.
7.What is the process for return or replacement of MAX1976EZT180+T?
All MAX1976EZT180+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1976EZT180+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 MAX1976EZT180+T part is unused and in its original packaging.
Return procedure for MAX1976EZT180+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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