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Analog Devices Inc./Maxim Integrated MAX1776EUA+
- Part No.:
- MAX1776EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1776EUA+.pdf
- Description:
- IC REG BUCK ADJ/5V 600MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,338
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Product details
Overview
The MAX1776EUA+ from Maxim Integrated is a high-efficiency, 24V-input, 600mA step-down DC-DC converter with internal P-channel MOSFET (RDS(ON) = 0.4Ω), 100% duty cycle operation for ultra-low dropout (240mV at 600mA), and adjustable output voltage range of 1.25V to VIN. It delivers stable power in space-constrained battery-powered systems such as notebook computers and handheld devices.
For engineers reviewing the MAX1776EUA+ datasheet, MAX1776EUA+ pinout, MAX1776EUA+ application, or MAX1776EUA+ equivalent, key selection criteria include its 4.5V–24V input range, 15µA quiescent current, thermal shutdown protection, and dual-mode feedback (fixed 5V or adjustable) - all critical for low-power, wide-input industrial and portable designs.
Technical Context
The MAX1776EUA+ employs a proprietary current-limited control architecture with variable-frequency operation, eliminating unnecessary switching under light loads to maximize efficiency. Its 100% duty cycle capability enables continuous conduction down to minimal input-output differential, directly supporting end-of-battery-life operation.
It integrates dual current-limit configuration pins (ILIM/ILIM2) enabling four selectable peak switch current limits (150mA–1200mA), and features Dual Mode™ feedback allowing either preset 5V output (FB = GND) or resistor-divider-adjustable regulation (VFB = 1.25V). Thermal shutdown activates at +160°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide-range industrial and battery inputs including 12V/24V rails and multi-cell Li-ion stacks. |
| Max Output Current | 600mA - determined by ILIM/ILIM2 configuration (IN/GND = 600mA peak switch current); sufficient for core logic and I/O rails. |
| Quiescent Current | 15µA - enables >1-year battery life in keep-alive supplies with microamp-level standby draw. |
| Dropout Voltage | 240mV at 600mA - achieved via 100% duty cycle and 0.4Ω internal P-MOSFET, extending usable battery voltage down to ~5.24V for 5V output. |
| Feedback Reference | 1.25V (±3%) - precise internal bandgap reference enables ±1% output accuracy over temperature and line/load. |
| Shutdown Current | 3µA - isolates input from output during deep sleep, preserving system battery charge. |
| Switching Frequency | Variable, up to 200kHz - self-adjusting frequency reduces EMI and enables compact 10µH–100µH inductors without external compensation. |
Pinout & Package
The MAX1776EUA+ is housed in an 8-pin µMAX package (3.05mm × 3.05mm × 0.8mm), occupying half the area of standard 8-pin SOIC and optimized for high-density portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Dual-Mode Feedback Input | Connect to GND for fixed 5V output; connect resistive divider (OUT–GND) for adjustable 1.25V–VIN regulation - sets output via 1.25V reference. |
| 2 GND | Power & Signal Ground | Common return for internal circuitry, LX freewheel path, and feedback reference - must be star-connected to minimize noise coupling. |
| 3 ILIM | Peak Current Limit Control | Configures current limit with ILIM2 (GND/IN); e.g., ILIM = IN, ILIM2 = GND → 600mA peak switch current → 300mA max continuous output. |
| 4 LX | Switch Node | Drives external inductor and Schottky diode; high dv/dt node requiring tight layout and ground shielding to prevent feedback instability. |
| 5 IN | Main Power Input | Accepts 4.5V–24V; requires local 10µF ceramic input capacitor to suppress ripple and supply peak switch current. |
| 6 ILIM2 | Secondary Current Limit Control | Works with ILIM to select one of four peak current limits (150/300/600/1200mA); determines inductor saturation margin and transient response. |
| 7 SHDN | Active-Low Shutdown | Pull low to reduce supply current to 3µA and disable LX switching; tie to IN for always-on operation - prevents floating-state malfunction. |
| 8 OUT | High-Z Output Sense | Internally connected to internal resistor divider; leave unconnected for outputs ≤5.5V; tie to GND if unused to avoid leakage-induced offset. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables dropout voltage as low as ILOAD × (RDS(ON) + RINDUCTOR), extending battery runtime in low-VIN conditions without regulation loss. |
| Current-Limited Control Architecture | Eliminates fixed-frequency PWM losses; switching occurs only when needed, reducing light-load current to 15µA and improving partial-load efficiency >95%. |
| Dual-Mode Feedback (Dual Mode™) | Single-pin FB supports both preset 5V (GND tie) and precision adjustable output (resistor divider), simplifying BOM across multiple voltage requirements. |
| Thermal Shutdown with Hysteresis | Shuts down at +160°C junction temperature and re-enables at +150°C, preventing thermal runaway while allowing safe recovery without system reset. |
| 8-Pin µMAX Package | 3.05mm × 3.05mm footprint saves >50% board area vs. SOIC-8, enabling compact power solutions in ultraportable and IoT edge devices. |
Applications
| Notebook Computers | Distributed Power Systems |
|---|---|
Use Scenario: Regulating 5V or adjustable core/I/O rail from 12V–24V main battery or adapter input in thin-and-light notebooks. IC Role / Device Role / Timing Role: Primary step-down regulator delivering up to 600mA with ultra-low quiescent current to extend battery life between charges. Use Value: 15µA IQ and 100% duty cycle enable >12-hour standby on single-cell Li-ion; µMAX package fits constrained motherboard layouts. | Use Scenario: Local point-of-load conversion in industrial PLCs or telecom equipment where 24V backplane supplies require isolated 3.3V/5V rails. IC Role / Device Role / Timing Role: Efficient, thermally robust buck converter handling wide input transients and load steps without external controller complexity. Use Value: 24V absolute max rating and thermal shutdown ensure reliability in noisy 24V industrial environments; adjustable VOUT supports mixed-voltage subsystems. |
| Keep-Alive Supplies | Hand-Held Devices |
Use Scenario: Maintaining RTC, memory backup, or sensor bias during main system shutdown in medical or metering equipment. IC Role / Device Role / Timing Role: Always-on low-IQ buck converter powering critical circuits from primary battery with minimal drain. Use Value: 3µA shutdown current and 15µA operating IQ allow multi-year operation on coin cells; fixed 5V mode simplifies design. | Use Scenario: Powering DSP, display, or RF modules in ruggedized handheld test instruments or field scanners. IC Role / Device Role / Timing Role: Compact, efficient DC-DC stage converting 2–4 cell Li-ion (8.4V–16.8V) to stable 3.3V or 5V for mixed-signal subsystems. Use Value: Wide 4.5V–24V input accommodates full battery discharge curve; µMAX size fits narrow bezels; thermal protection prevents overheating during extended use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3MHz fixed-frequency PWM, 300mA output, 2.05V–6.5V input, 12µA IQ; no 100% duty cycle or adjustable current limit. | Better for high-frequency, low-ripple apps with tight size constraints; unsuitable for >6.5V inputs or ultra-low dropout. | Select TPS62231DRYR when input is ≤6.5V and high switching frequency is prioritized over dropout performance. |
| LT1935ES5#TRMPBF | 1.25MHz constant-frequency, 1.5A output, 3.6V–36V input, 100µA IQ; includes soft-start and sync capability; no 100% duty cycle. | Higher input range and output current; better for automotive or 24V industrial rails needing robustness, but higher IQ reduces battery life. | Select LT1935ES5#TRMPBF when >24V input or >600mA load is required, accepting higher quiescent current and larger solution size. |
Compared with TPS62231DRYR and LT1935ES5#TRMPBF, the MAX1776EUA+ uniquely balances ultra-low IQ (15µA), 100% duty cycle dropout, and wide 4.5V–24V input in a 3mm² package - making it optimal for battery longevity and space-constrained 5V/adjustable rail generation where variable-frequency operation is acceptable.
Availability
MAX1776EUA+ is available at Aetrix Electronics and suitable for notebook computers, distributed power systems, and hand-held devices requiring stable component supply with long-term lifecycle support and consistent parametric performance.
Supply support for MAX1776EUA+ 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 MAX1776EUA+ belongs to Maxim's high-efficiency, wide-input buck converter product line, designed specifically for battery-powered and space-constrained systems demanding low quiescent current, ultra-low dropout, and minimal external component count.
FAQ
What is the maximum output current capability of the MAX1776EUA+?
The MAX1776EUA+ delivers up to 600mA continuous output current when configured with ILIM = IN and ILIM2 = GND, setting the peak switch current limit to 600mA. This corresponds to a maximum regulated output of 600mA under typical conditions with adequate thermal management and proper inductor selection per Table 3 in the datasheet. The actual achievable current depends on input voltage, ambient temperature, and PCB copper area.
Does the MAX1776EUA+ support fixed 5V output without external resistors?
Yes, the MAX1776EUA+ supports fixed 5V output by connecting the FB pin directly to GND - this engages its internal preset mode. In this configuration, the device regulates to 4.80V–5.20V (typical 5.00V) without any external feedback resistors, simplifying design for standard 5V rail applications and reducing BOM cost and board space.
How does the 100% duty cycle feature improve performance in battery-powered systems using the MAX1776EUA+?
The 100% duty cycle capability of the MAX1776EUA+ allows the internal P-MOSFET to remain continuously on when input voltage approaches output voltage, minimizing dropout to just ILOAD × (RDS(ON) + RINDUCTOR). For example, at 600mA, dropout is only 240mV - enabling usable operation down to ~5.24V input for a 5V output. This extends effective battery life by utilizing more of the cell's discharge curve before regulation is lost.
What package type is used for the MAX1776EUA+, and why is it advantageous?
The MAX1776EUA+ uses an 8-pin µMAX package (3.05mm × 3.05mm × 0.8mm), which occupies approximately half the PCB area of a standard 8-pin SOIC. This compact footprint is critical for space-constrained applications like ultraportable notebooks and handheld instruments, while maintaining robust thermal performance and compatibility with standard surface-mount assembly processes.
Can the MAX1776EUA+ be used in shutdown mode to conserve battery power, and what is its shutdown current?
Yes, the MAX1776EUA+ features an active-low SHDN pin that reduces total supply current to just 3µA when pulled low, effectively disconnecting the output from the input and halting switching. This ultra-low shutdown current makes the MAX1776EUA+ ideal for keep-alive supplies and systems requiring multi-year battery operation in standby - significantly outperforming many competing buck regulators in deep-sleep efficiency.
MAX1776EUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX1776EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1776EUA+ 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+ reliable?
The price and inventory of MAX1776EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1776EUA+ is usually 5 days.
3.What payment methods are accepted for MAX1776EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1776EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1776EUA+?
MAX1776EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1776EUA+ 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+?
For technical support, including MAX1776EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1776EUA+ requirements.
6.How does Aetrix verify that MAX1776EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX1776EUA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1776EUA+?
All MAX1776EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1776EUA+, 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+ part is unused and in its original packaging.
Return procedure for MAX1776EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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