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Analog Devices Inc./Maxim Integrated MAX1776EUA+T
- Part No.:
- MAX1776EUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1776EUA+T.pdf
- Description:
- IC REG BUCK ADJ/5V 600MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,422
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Product details
Overview
MAX1776EUA+T from Maxim Integrated is a high-efficiency, 24V-input, 600mA step-down DC-DC converter with internal P-channel MOSFET (0.4Ω RDS(ON)), 100% duty cycle operation for ultra-low dropout (240mV at 600mA), and adjustable output (1.25V–VIN) or fixed 5V mode. It targets battery-powered systems requiring extended runtime and wide input range, such as notebook computers and handheld devices.
For engineers reviewing the MAX1776EUA+T datasheet, MAX1776EUA+T pinout, MAX1776EUA+T application, or MAX1776EUA+T equivalent, key selection criteria include its 15µA quiescent current, thermal shutdown protection, dual-mode feedback (FB pin), configurable peak current limit via ILIM/ILIM2 pins, and µMAX-8 package compatibility with space-constrained portable designs.
Technical Context
The MAX1776EUA+T employs a proprietary current-limited control architecture with variable-frequency operation-switching only as needed to maintain regulation-eliminating unnecessary switching losses at light loads. Its 100% duty cycle capability enables continuous conduction down to minimal VIN–VOUT differential, directly supporting end-of-battery-life operation.
Feedback is implemented via Dual Mode™: grounding FB selects fixed 5V output; connecting FB to a resistive divider enables precise output adjustment from 1.25V to VIN. Peak current limit is set by combinations of ILIM and ILIM2 logic inputs (150mA–1200mA), allowing optimization for inductor sizing and transient response without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports single-cell Li-ion up to 24V industrial rails without pre-regulation. |
| Max Output Current | 600mA - determined by internal MOSFET RDS(ON) and thermal design; limited by peak switch current (up to 1200mA) and inductor saturation. |
| Quiescent Current | 15µA - enables >1000-hour standby in keep-alive supplies with minimal battery drain. |
| Shutdown Current | 3µA - ensures near-zero power loss during system sleep states. |
| Dropout Voltage | 240mV at 600mA - achieved via 100% duty cycle; enables usable output down to VIN − 0.24V. |
| Switching On-Resistance | 0.4Ω (typ.) - defines conduction loss and thermal rise; varies with ILIM/ILIM2 configuration and input voltage. |
| Feedback Reference | 1.25V (typ.) - sets output accuracy in adjustable mode; ±1.5% over temperature ensures stable regulation. |
Pinout & Package
MAX1776EUA+T is housed in an 8-pin µMAX package (3.05mm × 3.05mm × 0.8mm), occupying half the area of standard 8-pin SOIC. The thermally enhanced exposed pad improves power dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Dual-mode feedback input | Ground for 5V preset; connects to resistor divider for adjustable output (1.25V–VIN); bias current <±25nA minimizes divider error. |
| 2 GND | Power and signal ground reference | Must be connected to low-impedance star ground node; separates power and feedback return paths to avoid noise coupling. |
| 3 ILIM | Peak current limit control input | Logic input (GND/IN) paired with ILIM2 to select 150/300/600/1200mA peak switch current; sets inductor sizing and overload protection threshold. |
| 4 LX | Switch node connection | Drives external inductor and catch diode; high dv/dt node requiring short, low-inductance routing to minimize EMI and ringing. |
| 5 IN | Main input supply | Accepts 4.5V–24V; requires local 10µF ceramic input capacitor to suppress ripple and supply peak switch current. |
| 6 ILIM2 | Secondary peak current limit control | Logic input (GND/IN) used with ILIM to configure four discrete current-limit settings; no pull-up/down required. |
| 7 SHDN | Active-low shutdown enable | Pull low to reduce supply current to 3µA; high-impedance LX output isolates load; must not float-tie to IN if unused. |
| 8 OUT | High-impedance output sense | Internally connected to internal divider; connect to GND only when unused; do not use for outputs >5.5V to avoid damage. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables dropout voltage as low as ILOAD × (RDS(ON) + RINDUCTOR), extending usable battery voltage range beyond conventional buck converters. |
| Current-Limited Control Architecture | Eliminates fixed-frequency PWM losses; switching occurs only when regulation error exceeds threshold-reducing light-load current to 15µA. |
| Dual-Mode Feedback (FB Pin) | Single-pin configurability: grounded = 5V fixed; resistor divider = adjustable output-no external op-amp or reference needed. |
| Thermal Shutdown with Hysteresis | Shuts down at +160°C junction temperature and re-enables after 10°C cooldown-prevents thermal runaway without external circuitry. |
| Configurable Peak Current Limit | Four discrete limits (150/300/600/1200mA) via ILIM/ILIM2 logic inputs-enables inductor optimization for size, cost, and transient response. |
Applications
| Portable Medical Monitor Power | Notebook CPU Core Supply |
|---|---|
Use Scenario: Compact, battery-operated vital sign monitor requiring stable 3.3V rail across declining Li-ion voltage (4.2V → 3.0V). IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 3.3V from main battery; operates in 100% duty cycle below 3.55V input to sustain output until battery depletion. Use Value: 240mV dropout and 15µA quiescent current extend usable battery life by >18% versus comparable converters with higher dropout or quiescent draw. | Use Scenario: Low-noise, high-efficiency 5V supply for embedded microcontroller and peripheral ICs in ultraportable notebooks. IC Role / Device Role / Timing Role: Fixed 5V output configured via FB-to-GND; provides clean, well-regulated power with fast transient response to CPU activity bursts. Use Value: Internal 0.4Ω MOSFET and optimized control loop achieve >92% efficiency at 500mA, reducing thermal load on PCB and enabling fanless design. |
| Industrial IoT Sensor Node Keep-Alive | Handheld Barcode Scanner Power |
Use Scenario: Remote wireless sensor node powered by primary lithium thionyl chloride cell (3.6V nominal, 20-year shelf life), requiring microamp-level standby current. IC Role / Device Role / Timing Role: Always-on 3.3V regulator in shutdown-aware mode; wakes system on interrupt while maintaining <3µA total system sleep current. Use Value: 3µA shutdown current and undervoltage lockout (3.5V–4.3V threshold) prevent deep discharge and preserve cell longevity over multi-year deployments. | Use Scenario: Intermittent-use handheld scanner with alkaline AA batteries, needing robust 5V rail despite input sag under pulse load. IC Role / Device Role / Timing Role: Adjustable-output buck converter set to 5.0V; uses ILIM/ILIM2 to configure 600mA peak limit matching motor + laser diode surge demands. Use Value: Configurable current limit prevents false OCP trips during brief 400mA motor startup pulses while maintaining tight output regulation during decode cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | 3MHz fixed-frequency PWM; 0.6V–6V output; 300mA max; 2.5µA quiescent current; 2x2mm DSBGA package. | Higher switching frequency enables smaller inductors but lacks 100% duty cycle-dropout ~300mV at 300mA limits low-VIN usability. | Prefer for ultra-compact, high-frequency designs where input never drops below 5.5V; avoid where battery end-of-life voltage is critical. |
| LT1935ES5#TRMPBF | Hysteretic 1.25MHz converter; 3.6V–36V input; 1.5A output; 100µA quiescent current; SOT-23-5 package. | No 100% duty cycle; higher quiescent current reduces battery life in always-on applications; wider input supports 24V industrial rails. | Prefer for higher-current (>600mA), higher-input (>24V) needs; avoid in long-duration battery applications due to 100× higher light-load current. |
Compared with TPS62231DRYT and LT1935ES5#TRMPBF, MAX1776EUA+T uniquely balances ultra-low quiescent current (15µA), true 100% duty cycle for minimum dropout, and integrated current limiting-making it optimal for battery-powered systems operating near end-of-life voltage with strict standby current budgets.
Availability
MAX1776EUA+T is available at Aetrix Electronics and suitable for notebook computers, distributed power systems, and hand-held devices requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for MAX1776EUA+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) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, automotive, and consumer applications.
The MAX1776EUA+T belongs to Maxim's high-efficiency DC-DC converter product line, designed specifically for battery-powered portable electronics where extended runtime, wide input range, and minimal board space are critical.
FAQ
What output voltage options does the MAX1776EUA+T support?
The MAX1776EUA+T supports two output configurations: fixed 5V (by grounding the FB pin) or adjustable output from 1.25V to VIN (by connecting FB to a resistive divider between OUT and GND). In adjustable mode, the internal 1.25V reference ensures ±1.5% accuracy over temperature. The MAX1776EUA+T does not support negative or split-rail outputs, and OUT pin voltage must not exceed 5.5V.
How does the MAX1776EUA+T achieve 100% duty cycle operation?
The MAX1776EUA+T achieves 100% duty cycle by holding the internal P-channel MOSFET continuously on when the input voltage approaches the output voltage-eliminating switching and minimizing dropout to ILOAD × (RDS(ON) + RINDUCTOR). This behavior is intrinsic to its current-limited control architecture and requires no external components. The MAX1776EUA+T maintains regulation down to VIN = VOUT + 0.24V at full load.
What is the purpose of the ILIM and ILIM2 pins on the MAX1776EUA+T?
The ILIM and ILIM2 pins on the MAX1776EUA+T configure the peak switch current limit in four discrete steps (150mA, 300mA, 600mA, or 1200mA) using simple logic-level connections (GND or IN). This adjusts the maximum inductor current, enabling optimization of inductor size, saturation margin, and transient response. The MAX1776EUA+T does not require external current-sense resistors or compensation networks for this function.
Does the MAX1776EUA+T include thermal protection?
Yes, the MAX1776EUA+T includes thermal shutdown protection that activates at +160°C junction temperature and re-enables after a 10°C hysteresis cooldown. During sustained overload, this results in pulsed output operation to prevent permanent damage. The thermal sensor is fully integrated-no external components or PCB copper area adjustments are required for basic protection. The MAX1776EUA+T also includes current limiting and undervoltage lockout for comprehensive fault coverage.
Can the MAX1776EUA+T be used with input voltages below 4.5V?
No, the MAX1776EUA+T has a specified minimum input voltage of 4.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 4.5V may result in failure to start, erratic regulation, or undefined behavior-including potential violation of the 3.5V undervoltage lockout (UVLO) lower threshold. For sub-4.5V applications, alternative regulators such as the MAX17503 or TPS61099 should be evaluated. The MAX1776EUA+T is not characterized or guaranteed for operation below 4.5V.
MAX1776EUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 1.25V (5V)
- Voltage - Output (Max):
- 24V
- Current - Output:
- 600mA
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX1776EUA+T FAQ
1.How can I place an order for MAX1776EUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1776EUA+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 MAX1776EUA+T reliable?
The price and inventory of MAX1776EUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1776EUA+T is usually 5 days.
3.What payment methods are accepted for MAX1776EUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1776EUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1776EUA+T?
MAX1776EUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1776EUA+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 MAX1776EUA+T?
For technical support, including MAX1776EUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1776EUA+T requirements.
6.How does Aetrix verify that MAX1776EUA+T is sourced from the original manufacturer or authorized distributors?
All MAX1776EUA+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 MAX1776EUA+T meets industry standards.
7.What is the process for return or replacement of MAX1776EUA+T?
All MAX1776EUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1776EUA+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 MAX1776EUA+T part is unused and in its original packaging.
Return procedure for MAX1776EUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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