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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:1,102
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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 (0.4Ω RDS(ON)), 100% duty cycle operation for ultra-low dropout (240mV at 600mA), adjustable or fixed 5V output, and 15µA quiescent current-designed for battery-powered notebook computers and keep-alive supplies.
For engineers reviewing the MAX1776EUA datasheet, MAX1776EUA pinout, MAX1776EUA application, or MAX1776EUA equivalent, key selection criteria include input voltage range (4.5V–24V), peak current limit configuration via ILIM/ILIM2 pins, thermal shutdown (160°C), dropout behavior under light load, and µMAX package footprint constraints.
Technical Context
The MAX1776EUA implements a proprietary current-limited control architecture with variable-frequency operation-switching only as needed to maintain regulation-eliminating unnecessary switching losses at light loads. It features dual-mode feedback (fixed 5V or adjustable 1.25V–VIN) and programmable peak current limits (150mA–1200mA) via two logic-configurable pins (ILIM, ILIM2).
Its 100% duty-cycle capability enables true dropout operation: when VIN ≤ VOUT, the internal P-MOSFET remains fully on, reducing conduction loss to ILOAD × (RDS(ON) + RINDUCTOR). Thermal shutdown with 10°C hysteresis and LX zero-crossing detection (±75mV threshold) ensure robust protection during overload or startup.
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 - achievable with ILIM = IN, ILIM2 = GND; maximum continuous load in typical PCB layout with thermal derating. |
| Quiescent Current | 15µA - enables >1-year battery life in always-on keep-alive applications with microamp-level standby draw. |
| Dropout Voltage | 240mV at 600mA - determined by RDS(ON) + inductor DCR; allows usable output down to VIN = VOUT + 0.24V. |
| Feedback Reference | 1.25V (typ) - sets output via external resistor divider; ±1.5% accuracy over temperature ensures stable regulation. |
| Shutdown Current | 3µA - isolates input from output and disables switching; critical for zero-power sleep modes in portable systems. |
| Switch On-Resistance | 0.4Ω (typ, VIN = 12V, ILIM/ILIM2 = IN) - directly determines conduction loss and thermal rise at full load. |
| Thermal Shutdown | 160°C with 10°C hysteresis - protects against sustained overload or poor heatsinking without latch-up. |
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 space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Dual-mode feedback input | Connect to GND for fixed 5V output; connect to resistive divider for adjustable 1.25V–VIN output-sets regulation point with 1.25V reference. |
| 2 GND | Analog/digital ground reference | Star-ground connection point for power components (CIN, COUT, L1, D1); must be low-impedance to avoid noise coupling into FB path. |
| 3 ILIM | Peak current limit control (MSB) | Logic input (GND/IN) that, with ILIM2, selects one of four current-limit thresholds: 150/300/600/1200mA. |
| 4 LX | Switch node | Drives external inductor and catch diode; carries pulsed high-current waveform-requires short, wide trace and tight loop with CIN/D1. |
| 5 IN | Main power input | Accepts 4.5V–24V; supplies internal circuitry and switch; requires local 10µF ceramic decoupling placed near pin. |
| 6 ILIM2 | Peak current limit control (LSB) | Second logic input (GND/IN); combined with ILIM, configures peak switch current limit per Table 1 in datasheet. |
| 7 SHDN | Enable/shutdown control | Active-low logic input; pulls supply current to 3µA and places LX in high-impedance state when driven low. |
| 8 OUT | High-impedance output sense | Internally connected to internal resistor divider; leave unconnected for outputs >5.5V; tie to GND if unused to prevent floating node. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables true dropout mode-MOSFET stays fully on when VIN ≤ VOUT, minimizing voltage headroom and extending battery runtime. |
| Current-limited control architecture | Eliminates fixed-frequency PWM switching losses at light loads; frequency scales with load, improving efficiency across 10µA–600mA range. |
| Dual-mode feedback (FB pin) | Supports both preset 5V output (FB = GND) and precision-adjustable output (1.25V reference) without external op-amps or compensation networks. |
| Programmable peak current limit | Four discrete current limits (150/300/600/1200mA) set via two logic pins-enables optimal inductor selection and overcurrent protection tuning. |
| Thermal shutdown with hysteresis | Shuts down at 160°C junction temperature and re-enables at 150°C-prevents thermal runaway while allowing recovery without system reset. |
| µMAX package footprint | 3.05mm × 3.05mm body with 0.65mm pitch-reduces PCB area by 50% vs. SOIC-8, enabling compact handheld and IoT power designs. |
Applications
| Hand-Held Devices | Notebook Computers |
|---|---|
Use Scenario: Powering low-voltage logic (3.3V/5V) and RF modules in GPS trackers, medical sensors, and barcode scanners operating from single/dual Li-ion cells. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated output from varying battery voltage (4.5V–24V), maintaining stability during deep discharge and load transients. Use Value: 15µA quiescent current extends shelf life and operational runtime; 100% duty cycle sustains output down to 3.74V input for 3.5V systems. | Use Scenario: Supplying auxiliary rails (e.g., USB port power, keyboard controller, fan bias) in ultrabooks where space and thermal budget are constrained. IC Role / Device Role / Timing Role: Secondary step-down converter replacing discrete solutions-integrates switch, current sensing, and control in one µMAX package. Use Value: Internal 0.4Ω P-MOSFET eliminates external FET and gate driver; small footprint reduces layer count and BOM cost versus controller+MOSFET combos. |
| Distributed Power Systems | Keep-Alive Supplies |
Use Scenario: Local point-of-load conversion in industrial PLCs or telecom line cards where 24V backplane feeds multiple isolated subsystems. IC Role / Device Role / Timing Role: Non-isolated buck stage converting 24V to 5V/3.3V for microcontrollers, ADCs, and interface ICs-operating across wide ambient temperature (-40°C to +85°C). Use Value: Input undervoltage lockout (3.5V–4.4V) prevents erratic behavior during brownout; thermal shutdown protects during field-replaceable module failure. | Use Scenario: Maintaining real-time clock (RTC), SRAM, or security FPGA configuration during main system power-off in smart meters and automotive ECUs. IC Role / Device Role / Timing Role: Always-on regulator powered from backup battery or supercapacitor-delivering stable 5V with minimal self-discharge. Use Value: 3µA shutdown current minimizes backup source depletion; adjustable output allows precise match to RTC/SRAM VDD requirements (e.g., 3.0V, 3.3V). |
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, 300mA max, 2.05V–6.5V input, 1.5µA IQ, 1.2mm × 1.6mm DSBGA | Better suited for ultra-small footprint and higher switching frequency; lacks 100% duty cycle and wide 4.5V–24V input range. | Select when board space is <1.5mm² and input is limited to ≤6.5V; not suitable for 12V/24V battery or industrial rails. |
| LT1935ES5#TRMPBF | Hysteretic 1.25MHz buck, 1.2A max, 3.6V–36V input, 100µA IQ, SOT-23-5 | Higher input voltage ceiling and output current, but higher quiescent current and no programmable current limit. | Choose for 36V industrial inputs or >600mA loads; trade-off is 7× higher light-load IQ and less precise current limiting. |
Compared with TPS62231DRYT and LT1935ES5#TRMPBF, the MAX1776EUA uniquely balances ultra-low IQ (15µA), 24V input support, 100% dropout, and µMAX size-making it optimal for long-life, wide-input, space-sensitive battery systems where efficiency at microamp loads is critical.
Availability
The MAX1776EUA is available at Aetrix Electronics and suitable for notebook computers, distributed power systems, and keep-alive supplies requiring stable component supply, extended temperature operation (-40°C to +85°C), and long-term obsolescence management.
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 DC-DC converter product line, designed specifically for battery-powered and space-constrained systems requiring low quiescent current, wide input range, and minimal external components.
FAQ
What is the maximum output current supported by the MAX1776EUA?
The MAX1776EUA delivers up to 600mA continuous output current when configured with ILIM = IN and ILIM2 = GND. This rating assumes proper thermal management on a standard 2-layer PCB with 1oz copper and adequate airflow. At higher ambient temperatures or with reduced copper area, derating applies-e.g., ~450mA at +70°C ambient. The peak switch current limit is 1200mA, but maximum sustainable output is half that value due to duty cycle and thermal constraints. The MAX1776EUA datasheet specifies 600mA as the guaranteed maximum under typical operating conditions.
How does the MAX1776EUA achieve 100% duty cycle operation?
The MAX1776EUA achieves 100% duty cycle by holding its internal P-channel MOSFET fully on when the input voltage drops to or below the regulated output voltage-eliminating switching entirely. This mode minimizes dropout voltage to ILOAD × (RDS(ON) + RINDUCTOR), enabling operation down to VIN = VOUT + 0.24V at 600mA. Unlike PWM converters that require minimum off-time, the MAX1776EUA's current-limited architecture allows indefinite on-time when regulation error persists. This behavior is confirmed in the "Input-Output (Dropout) Voltage" section of the MAX1776EUA datasheet.
Can the MAX1776EUA be used with an adjustable output voltage?
Yes, the MAX1776EUA supports adjustable output from 1.25V to VIN using the FB pin in conjunction with an external resistor divider. When FB is tied to GND, the device defaults to a fixed 5.0V output. For adjustable operation, connect FB between the top (R1) and bottom (R2) resistors of a divider from OUT to GND, where VOUT = 1.25V × (1 + R1/R2). The MAX1776EUA's 1.25V feedback reference has ±1.5% tolerance over temperature, ensuring stable regulation. Recommended R2 values range from 10kΩ to 100kΩ to minimize bias current error.
What is the purpose of the OUT pin on the MAX1776EUA?
The OUT pin on the MAX1776EUA is a high-impedance output sense node internally connected to the upper resistor of the internal feedback divider. It is not a power output pin. When using the fixed 5V mode (FB = GND), leave OUT unconnected. For outputs exceeding 5.5V, do not connect OUT to avoid overstress. If unused, tie OUT to GND to prevent floating-this avoids leakage-induced regulation errors. The MAX1776EUA datasheet explicitly warns against connecting OUT for VOUT > 5.5V and confirms its role solely as a sensing node, not a current-carrying output terminal.
Does the MAX1776EUA include thermal protection?
Yes, the MAX1776EUA incorporates thermal-overload protection that activates at a junction temperature of +160°C, shutting off the internal P-channel MOSFET to prevent damage. After shutdown, the device remains off until the junction cools by 10°C (to +150°C), at which point it automatically resumes operation-creating a pulsed output under sustained overload. This hysteresis prevents thermal cycling instability. The protection is fully integrated and requires no external components. Thermal shutdown behavior is characterized across -40°C to +85°C ambient and is guaranteed per the MAX1776EUA absolute maximum ratings table.
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:
- Obsolete
- 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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