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Analog Devices Inc./Maxim Integrated MAX1976ETT250
- Part No.:
- MAX1976ETT250
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX1976ETT250.pdf
- Description:
- IC REG LINEAR 300MA LDO REG
- Quantity:
- Payment:
- Shipping:
Inventory:219
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Product details
Overview
The MAX1976ETT250 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 2.50V 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 power management in space-constrained portable electronics such as notebook computers and digital cameras.
For engineers reviewing the MAX1976ETT250 datasheet, MAX1976ETT250 pinout, MAX1976ETT250 application, or MAX1976ETT250 equivalent, key selection criteria include guaranteed 300mA load capability under low-input-voltage conditions (≥1.62V), tight output regulation across load/line/temperature, integrated reset timing, thermal and short-circuit protection, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The MAX1976ETT250 uses an internal P-channel MOSFET pass transistor (RDS(ON) = 0.33Ω) enabling supply current independence from load and dropout voltage - critical for battery runtime optimization. Its error amplifier compares a precision reference against feedback from a fixed internal resistor divider to maintain 2.50V output regulation.
RESET functionality is implemented via a dedicated comparator monitoring VOUT; it asserts low when output falls below 82.5% of nominal (2.06V) and remains asserted 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 2.50V ±0.5% - eliminates external feedback components and ensures stable core voltage for 2.5V logic rails. |
| Max Output Current | 300mA continuous - supports moderate-power subsystems like camera ISPs or USB PHYs without external boost. |
| Dropout Voltage | 100mV at 300mA - enables operation down to 2.60V input, extending usable battery life in single-cell Li-ion systems. |
| Input Voltage Range | +1.62V to +3.6V - compatible with partially discharged Li-ion (≥3.0V), LiFePO4, or dual-AA alkaline supplies. |
| RESET Delay | 70ms (min) - meets microprocessor power-on reset timing requirements for ARM Cortex-M and similar MCUs. |
| Quiescent Current | 90µA typical at 300mA load - maintains low static power in always-on subsystems such as real-time clocks or sensor hubs. |
| PSRR | 70dB @ f < 1kHz - suppresses ripple from noisy DC-DC converters feeding the LDO input. |
Pinout & Package
MAX1976ETT250 is housed in a 6-pin 3mm × 3mm thin DFN package (pkg code T633-2), 0.8mm max height, with exposed paddle (EP) connected to GND for thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EP) | Exposed Pad | Thermal ground plane - must be soldered to PCB ground pour to achieve 1951mW power dissipation rating at +70°C ambient. |
| 2 | RESET | Open-drain active-low reset flag - requires external pull-up; asserts low during power-up, brownout, or shutdown. |
| 3 | SHDN | Active-low enable - drives internal pass transistor gate; logic high enables regulation, logic low disables output and resets RESET. |
| 4 | GND | Analog/digital ground reference - connects internally to EP; forms return path for IN, OUT, and RESET currents. |
| 5 | IN | Input supply rail - accepts 1.62V–3.6V; requires ≥1µF ceramic bypass capacitor placed adjacent to pin. |
| 6 | OUT | Regulated 2.50V output - sources up to 300mA; requires ≥4.7µF low-ESR ceramic capacitor with ESR ≤30mΩ. |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current loss, enabling 90µA quiescent current even at full 300mA load and in dropout. |
| Internally trimmed 2.50V output | Removes need for external resistive feedback network - reduces BOM count and layout area in compact designs. |
| 70ms RESET assertion delay | Guarantees sufficient hold-off time for microcontroller initialization before release, eliminating need for external RC timing. |
| Thermal shutdown with 15°C hysteresis | Prevents latch-up during sustained overload; cycles output on/off to limit junction temperature to ≤+165°C. |
| Logic-controlled shutdown | Reduces supply current to <1µA and actively discharges OUT via 1.5kΩ internal resistor - ideal for system-level power gating. |
Applications
| Smartphone Baseband Power | Digital Camera Image Sensor Bias |
|---|---|
Use Scenario: Supplying 2.50V bias to CMOS image sensor analog front-end in battery-powered digital cameras. IC Role / Device Role / Timing Role: Primary LDO delivering clean, regulated 2.50V with fast transient response to handle pixel readout current spikes. Use Value: 100mV dropout enables operation until battery reaches 2.60V; 70ms RESET ensures sensor firmware initializes fully before exposure control begins. |
Use Scenario: Providing stable 2.50V core voltage to baseband processor in 3G/4G smartphones during RF transmission bursts. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO decoupling switching noise from PMIC outputs to preserve ADC/DAC performance. Use Value: 70dB PSRR at sub-1kHz suppresses PMIC ripple; ±0.5% accuracy maintains processor timing margins across temperature and load. |
| Notebook Computer USB Hub Controller | Industrial Handheld Scanner Logic Rail |
Use Scenario: Powering USB 2.0 hub controller IC requiring tightly regulated 2.50V I/O rail in ultraportable notebooks. IC Role / Device Role / Timing Role: Secondary LDO generating isolated 2.50V from main 3.3V rail, with RESET synchronized to system power sequencing. Use Value: Active-low RESET signals host controller only after VOUT stabilizes, preventing enumeration failures during cold boot. |
Use Scenario: Delivering 2.50V logic supply to barcode scanner ASIC in ruggedized handheld terminals operating from 2xAA or Li-ion batteries. IC Role / Device Role / Timing Role: Main system LDO supporting wide input range (1.62V–3.6V) to accommodate battery discharge curve without brownout resets. Use Value: 1.62V minimum input allows >95% battery utilization; thermal protection prevents failure during extended scanning sessions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B252MR-G | 2.50V fixed output, 300mA, 150mV dropout at 300mA, no integrated RESET. | Lacks built-in reset function - requires external supervisor IC for power-on sequencing. | Select when RESET is managed elsewhere in system; lower cost where reset timing is non-critical. |
| Analog Devices ADP160AUJZ-2.5-R7 | 2.50V fixed output, 150mA max, 195mV dropout at 150mA, 1.8V min input, no RESET. | Lower current rating and no reset - unsuitable for 300mA loads or MCU supervision. | Only viable for low-power 2.5V rails where current demand ≤150mA and reset is externally handled. |
Compared with the MAX1976ETT250, the XC6219B252MR-G offers identical output voltage and current but requires external reset circuitry, while the ADP160AUJZ-2.5-R7 lacks both current headroom and reset functionality - making MAX1976ETT250 uniquely suited for compact, self-contained 2.5V power-supply-and-supervision solutions.
Availability
MAX1976ETT250 is available at Aetrix Electronics and suitable for notebook computers, digital cameras, and handheld industrial scanners requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX1976ETT250 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, computing, and portable applications.
The MAX1963/MAX1976 product line was engineered to deliver ultra-low-input-voltage regulation with integrated power-good signaling for space- and power-constrained battery-operated devices.
FAQ
What is the output voltage tolerance of the MAX1976ETT250 over temperature and load?
The MAX1976ETT250 guarantees ±0.5% output voltage accuracy across -40°C to +85°C, 1mA to 300mA load, and input voltages from (VOUT + 0.5V) to +3.6V. This specification is confirmed in the Electrical Characteristics table and validated by design over the full operating range - not just at +25°C.
Does the MAX1976ETT250 require external components to operate?
Yes - the MAX1976ETT250 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 noise suppression per the datasheet's Capacitor Selection section.
How does the RESET output behave during shutdown?
When SHDN is pulled low, the MAX1976ETT250 actively pulls RESET low immediately. RESET remains asserted (low) throughout shutdown and only releases high ≥70ms after VOUT rises above 82.5% of 2.50V (i.e., ≥2.06V) upon subsequent enable.
Can the MAX1976ETT250 be used with input voltages below 1.62V?
No - the absolute minimum input voltage for regulation is +1.62V. Below this, the device enters undervoltage lockout (UVLO) and disables regulation. The UVLO threshold is specified at 1.30V to 1.60V with ~180mV hysteresis, ensuring reliable turn-on only when VIN exceeds 1.62V.
What thermal derating applies to the MAX1976ETT250 in its TDFN package?
The MAX1976ETT250 in the 3mm × 3mm TDFN package has a thermal derating factor of 24.4mW/°C above +70°C ambient. Its maximum continuous power dissipation is 1951mW at +70°C, decreasing linearly as ambient temperature rises - requiring adequate PCB copper area under the exposed pad for thermal management.
MAX1976ETT250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 3.6V
- Voltage - Output (Min/Fixed):
- 2.5V
- 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:
- 6-TDFN-EP (3x3)
MAX1976ETT250 FAQ
1.How can I place an order for MAX1976ETT250 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1976ETT250 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 MAX1976ETT250 reliable?
The price and inventory of MAX1976ETT250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1976ETT250 is usually 5 days.
3.What payment methods are accepted for MAX1976ETT250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1976ETT250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1976ETT250?
MAX1976ETT250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1976ETT250 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 MAX1976ETT250?
For technical support, including MAX1976ETT250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1976ETT250 requirements.
6.How does Aetrix verify that MAX1976ETT250 is sourced from the original manufacturer or authorized distributors?
All MAX1976ETT250 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 MAX1976ETT250 meets industry standards.
7.What is the process for return or replacement of MAX1976ETT250?
All MAX1976ETT250 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1976ETT250, 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 MAX1976ETT250 part is unused and in its original packaging.
Return procedure for MAX1976ETT250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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