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Analog Devices Inc./Maxim Integrated MAX1920ETT
- Part No.:
- MAX1920ETT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX1920ETT.pdf
- Description:
- IC REG BUCK ADJ 400MA 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,332
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Product details
Overview
The MAX1920ETT from Maxim Integrated is a 400mA, adjustable-output synchronous step-down DC-DC converter in a 6-pin TDFN package, delivering regulated output voltages from 1.25V to 4.0V with ±1.5% initial accuracy, 1.2MHz max switching frequency, and 50μA quiescent current-designed for space-constrained battery-powered equipment such as PDAs and wireless handsets.
For engineers reviewing the MAX1920ETT datasheet, MAX1920ETT pinout, MAX1920ETT application, or MAX1920ETT equivalent, key selection considerations include its adjustable feedback architecture (FB pin), internal synchronous rectification, 2V–5.5V input range, 0.1μA shutdown current, and TDFN thermal performance (1454.5mW at +70°C).
Technical Context
The MAX1920ETT employs a proprietary current-limited control scheme with fixed minimum on-time (0.4μs typ) and off-time (0.4μs typ), enabling fast transient response across load currents from 20mA to 400mA while maintaining high efficiency (>90%) via integrated high-side (0.6Ω RONHS) and synchronous rectifier (0.5Ω RONSR) MOSFETs.
Its voltage regulation relies on a precision 1.25V FB threshold (1.231–1.269V at +25°C), supported by internal soft-start that ramps current limit in 25% steps, and logic-controlled shutdown (SHDN pin) that reduces supply current to 0.1μA while placing LX in high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 400mA continuous-supports compact power rails for microcontrollers and RF ICs without external current-sense resistors. |
| Input Voltage Range | 2.5V to 5.5V-compatible with single Li+ cells (2.7–4.2V), 3.3V/5V system rails, and dual-AA alkaline sources. |
| Output Voltage Range | Adjustable 1.25V to 4.0V via external resistor divider on FB pin-enables precise core voltage tuning for ASICs and FPGAs. |
| Switching Frequency | Up to 1.2MHz-permits use of small 4.7μH–10μH inductors and 4.7μF–10μF ceramic output capacitors, reducing board area. |
| Quiescent Current | 50μA typical-minimizes battery drain during light-load operation in always-on portable devices. |
| Shutdown Current | 0.1μA-enables ultra-low-power sleep modes in handheld instrumentation and sensor nodes. |
| Feedback Threshold | 1.25V ±1.5% (±1.231–1.269V at +25°C)-ensures tight output regulation under varying load and temperature conditions. |
Pinout & Package
MAX1920ETT uses a thermally enhanced 6-pin TDFN package (2mm × 2mm × 0.75mm, 0.5mm pitch) with exposed thermal pad for improved power dissipation (1454.5mW at +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AGND) | Analog Ground | Reference node for internal error amplifier and FB comparator; must be connected to PGND at single-point star ground. |
| 2 (IN) | Power Input | Primary supply input (2.5V–5.5V); requires local 2.2μF ceramic bypass capacitor to minimize high-frequency noise. |
| 3 (SHDN) | Active-Low Enable | Pull low to enter 0.1μA shutdown; pull high to IN for normal operation; 0.4V/1.6V logic thresholds ensure robust noise immunity. |
| 4 (LX) | Switch Node | Connection to external inductor; carries high di/dt switching current-requires short, wide trace and separation from sensitive analog paths. |
| 5 (PGND) | Power Ground | Return path for high-current switching loop; must be tied to AGND at single point near device to avoid ground bounce. |
| 6 (FB) | Voltage Feedback | Regulates output via external resistor divider; 0.01–0.20μA bias current enables high-impedance dividers without significant error. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Integrated high-side and low-side MOSFETs eliminate external Schottky diode, improving efficiency >90% and reducing BOM count. |
| Internal Soft-Start | Gradually ramps current limit in 25% steps at startup-limits inrush current and avoids input rail collapse on weak batteries. |
| Voltage Positioning Architecture | Feed-forward compensation (CFF) and LX-sensed feedback enable controlled load regulation-halves peak-to-peak output excursions during transients. |
| TDFN Thermal Performance | 18.2mW/°C derating above +70°C supports sustained 400mA operation in compact enclosures without forced airflow. |
| Logic-Controlled Shutdown | 0.1μA shutdown current and high-impedance LX state enable seamless integration into host MCU power management sequences. |
Applications
| Wireless Handset Power Management | Portable Medical Sensor Node |
|---|---|
Use Scenario: Supplies 1.8V to CDMA power amplifier and 3.3V to baseband processor from single Li+ cell in next-generation handset designs. IC Role / Device Role / Timing Role: Primary buck regulator providing dynamically scaled, low-noise VPA and VBB rails with fast load-transient response. Use Value: 1.2MHz switching enables <10mm² total solution size; 50μA quiescent current extends standby time beyond 72 hours. | Use Scenario: Powers ultra-low-power ECG front-end ASIC and BLE radio in disposable wearable patch monitors. IC Role / Device Role / Timing Role: Adjustable-output step-down converter delivering stable 1.25V core voltage and 3.0V analog rail from coin-cell or thin-film battery. Use Value: 0.1μA shutdown current and voltage positioning reduce output ripple during sensor sampling bursts, improving ADC SNR by ≥3dB. |
| PDA System Power Rail | Industrial Handheld Terminal |
Use Scenario: Generates 1.5V for ARM9 core and 2.5V for LCD driver in palm-sized PDA with dual-battery backup. IC Role / Device Role / Timing Role: Dual-rail DC-DC controller supporting independent enable sequencing and brownout protection. Use Value: ±1.5% output accuracy ensures reliable CPU operation across -40°C to +85°C; TDFN package fits beneath display bezel. | Use Scenario: Supplies 3.3V to RFID reader IC and 1.8V to secure element in ruggedized warehouse terminal operating on 4xAA alkaline. IC Role / Device Role / Timing Role: High-efficiency buck converter maintaining regulation down to 2.5V input-critical for end-of-battery-life operation. Use Value: Internal synchronous rectification sustains >85% efficiency at 20mA load, extending field service life by 2.3× versus linear regulators. |
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 | Fixed 1.8V output only; 3MHz switching; 20μA quiescent current; 300mA rated. | Not adjustable; unsuitable for multi-voltage systems requiring 1.25V–4.0V tuning. | Select when fixed 1.8V rail and ultra-low IQ outweigh need for output flexibility. |
| RT8059GJ6 | Adjustable 0.6V–5.5V; 2.5MHz switching; 30μA IQ; 600mA rated; SOT23-6 package. | Larger footprint than TDFN; lower thermal performance (695mW vs. 1454.5mW at +70°C). | Prefer for higher current or cost-sensitive SOT23 layouts-but verify thermal margin at 400mA continuous. |
Compared with TPS62231DRYR and RT8059GJ6, the MAX1920ETT uniquely balances adjustability (1.25V–4.0V), TDFN thermal capability, and proven 400mA delivery in harsh industrial environments-making it optimal where board space, thermal headroom, and voltage flexibility are jointly constrained.
Availability
MAX1920ETT is available at Aetrix Electronics and suitable for battery-powered equipment, wireless handsets, and portable medical devices requiring stable component supply across extended temperature ranges (-40°C to +85°C) and long production lifecycles.
Supply support for MAX1920ETT 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, automotive, and consumer applications.
The MAX1920ETT belongs to Maxim's low-voltage, high-efficiency DC-DC converter product line-designed specifically for space- and power-constrained portable electronics needing reliable sub-1V to 4V regulation from single-cell sources.
FAQ
What is the maximum output current capability of the MAX1920ETT?
The MAX1920ETT delivers a guaranteed 400mA continuous output current across its full operating temperature range (-40°C to +85°C). This rating is validated under standard test conditions with proper PCB layout, thermal management, and recommended external components (e.g., 4.7μH inductor, 10μF ceramic output capacitor). Peak current capability reaches 730mA due to internal high-side current limiting, but sustained operation above 400mA requires careful thermal design using the TDFN package's exposed pad.
Does the MAX1920ETT require an external Schottky diode?
No, the MAX1920ETT does not require an external Schottky diode. It integrates both high-side and synchronous rectifier MOSFETs internally, eliminating the need for an external diode and improving conversion efficiency to over 90%. This integration also reduces solution size, component count, and potential failure points-key advantages in portable and space-constrained applications where the MAX1920ETT is commonly deployed.
How is output voltage set on the MAX1920ETT?
The MAX1920ETT uses an adjustable feedback architecture: output voltage is set externally via a resistor divider connected between VOUT, FB pin, and GND. The internal reference is 1.25V, so VOUT = 1.25V × (1 + R1/R2). For example, using R2 = 100kΩ and R1 = 150kΩ yields 3.125V. The FB pin draws only 0.01–0.20μA, allowing high-impedance dividers without significant regulation error-enabling precise, flexible voltage scaling not possible with fixed-output alternatives like the MAX1921 series.
What is the purpose of the CFF capacitor in MAX1920ETT circuits?
The CFF (feed-forward) capacitor in MAX1920ETT circuits provides dynamic compensation for load transients when using ceramic output capacitors. Connected between the LX node and FB pin, CFF injects a feed-forward signal proportional to switching node dv/dt, enabling voltage positioning behavior that halves peak-to-peak output excursions during rapid load changes. Its value is calculated as CFF ≈ 2.5×10⁻⁵ / Req, where Req is the parallel resistance of the FB divider-ensuring stability and minimal overshoot/undershoot in applications like microcontroller power rails.
Can the MAX1920ETT operate from a 2.0V input source?
No, the MAX1920ETT cannot reliably operate from a 2.0V input. Its specified input voltage range is 2.5V to 5.5V, with a UVLO threshold of 1.85V (rising) and 1.50V (falling). At 2.0V input, the device may fail to start or drop out of regulation due to insufficient headroom for internal circuitry and gate drive. For 2.0V–2.5V operation, consider the MAX1921EUT15 or MAX1921EUT18 variants, which are explicitly rated for 2.0V minimum input-confirming that the MAX1920ETT's 2.5V lower limit is a hard specification, not a recommendation.
MAX1920ETT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 4V
- Current - Output:
- 400mA
- Frequency - Switching:
- Up to 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TDFN-EP (3x3)
MAX1920ETT FAQ
1.How can I place an order for MAX1920ETT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1920ETT 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 MAX1920ETT reliable?
The price and inventory of MAX1920ETT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1920ETT is usually 5 days.
3.What payment methods are accepted for MAX1920ETT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1920ETT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1920ETT?
MAX1920ETT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1920ETT 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 MAX1920ETT?
For technical support, including MAX1920ETT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1920ETT requirements.
6.How does Aetrix verify that MAX1920ETT is sourced from the original manufacturer or authorized distributors?
All MAX1920ETT 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 MAX1920ETT meets industry standards.
7.What is the process for return or replacement of MAX1920ETT?
All MAX1920ETT units undergo pre-shipment inspection (PSI). If there is an issue with MAX1920ETT, 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 MAX1920ETT part is unused and in its original packaging.
Return procedure for MAX1920ETT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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