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Analog Devices Inc./Maxim Integrated MAX1920ETT+T
- Part No.:
- MAX1920ETT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX1920ETT+T.pdf
- Description:
- IC REG BUCK ADJ 400MA 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,933
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Product details
Overview
The MAX1920ETT+T from Maxim Integrated is a high-efficiency, adjustable-output synchronous step-down DC-DC converter delivering up to 400mA at output voltages from 1.25V to 4.0V, operating from a 2.5V–5.5V input, featuring 50μA quiescent current, 1.2MHz max switching frequency, and internal synchronous rectification for >90% efficiency-ideal for space-constrained battery-powered handheld devices.
For engineers reviewing the MAX1920ETT+T datasheet, MAX1920ETT+T pinout, MAX1920ETT+T application, or MAX1920ETT+T equivalent, key selection considerations include its TDFN-6 package footprint, adjustable feedback (FB) architecture, ±1.5% initial output voltage accuracy, shutdown current of 0.1μA, and compatibility with ceramic output capacitors in voltage-positioning topologies.
Technical Context
The MAX1920ETT+T 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 and stable operation across light-to-heavy loads without external compensation. Its internal synchronous rectifier eliminates the need for an external Schottky diode.
This device integrates digital soft-start (25% incremental current-limit ramp), logic-controlled active-low shutdown (SHDN), and FB regulation to 1.25V nominal with ±1.5% initial accuracy. It supports voltage positioning via feed-forward capacitor (CFF) when used with ceramic output capacitors, reducing load-transient undershoot/overshoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 400mA continuous-supports power rails for baseband processors and RF amplifiers in compact portable systems. |
| Input Voltage Range | 2.5V to 5.5V-compatible with single-cell Li+ (2.7–4.2V), 3.3V rails, and dual-AA alkaline sources. |
| Output Voltage Range | Adjustable 1.25V to 4.0V via external resistor divider on FB pin-enables precise rail tuning for ASICs, FPGAs, and memory interfaces. |
| Quiescent Current | 50μA typical-minimizes standby power loss in always-on subsystems like real-time clocks or sensor hubs. |
| Switching Frequency | Up to 1.2MHz-permits use of small 4.7μH–10μH inductors and 2.2μF–10μF ceramic capacitors, reducing board area and BOM cost. |
| Shutdown Current | 0.1μA-enables ultra-low-power system sleep modes without external load switches. |
| Feedback Threshold | 1.25V ±1.5% (25°C), 1.25V ±2.5% (–40°C to +85°C)-ensures tight output regulation across temperature for precision analog supplies. |
Pinout & Package
MAX1920ETT+T is housed in a thermally enhanced, lead-free 6-pin TDFN package (2mm × 2mm × 0.75mm, 0.5mm pitch), optimized for high-power-density layouts and improved thermal dissipation over SOT23-6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Power Input | Primary supply input (2.5V–5.5V); requires local 2.2μF ceramic bypass capacitor to PGND. |
| 2 - AGND | Analog Ground | Reference ground for internal error amplifier and feedback circuitry; must be connected to PGND at a single point. |
| 3 - SHDN | Active-Low Enable | Logic-controlled shutdown input; <0.4V disables regulator and reduces IIN to 0.1μA; >1.6V enables operation. |
| 4 - LX | Switch Node | Connection to external inductor; carries high-frequency pulsed current; requires short, low-inductance routing. |
| 5 - PGND | Power Ground | High-current return path for internal MOSFETs and inductor; must be tied to AGND at star point near device. |
| 6 - FB | Feedback Input | Resistive divider input regulating output to 1.25V; determines VOUT = 1.25V × (1 + R1/R2); sensitive to noise-must be routed away from LX. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Integrated high-side and low-side MOSFETs eliminate external Schottky diode, improving efficiency by ≥5% and simplifying layout. |
| Digital Soft-Start | Internal 25%-step current-limit ramp prevents input surge during startup, reducing required CIN size and avoiding brownout in weak battery sources. |
| Voltage Positioning Topology | Feed-forward compensation (CFF) enables ceramic-capacitor-based designs with minimized load-transient voltage excursions (<±15mV typical). |
| Thermal Performance | TDFN package delivers 1454.5mW continuous power dissipation at +70°C (derated 18.2mW/°C above), supporting higher ambient operation than SOT23-6. |
| Robust Protection | Includes UVLO (1.95V rising threshold), 730mA typical high-side current limit, and 550mA inductor saturation margin for reliable 400mA delivery. |
Applications
| Mobile Baseband Power | RF Power Amplifier Bias |
|---|---|
Use Scenario: Powers baseband processor core and I/O rails in next-generation wireless handsets and PDAs using single Li+ cell input. IC Role / Device Role / Timing Role: Adjustable synchronous buck regulator providing stable 1.8V/2.5V/3.3V rails with fast load-step response to handle burst-mode processing. Use Value: 50μA quiescent current extends standby time; 1.2MHz switching allows miniaturized 4.7μH inductor and 4.7μF ceramic output capacitor. | Use Scenario: Supplies CDMA/WCDMA power amplifier stages requiring tightly regulated, low-noise 2.5V or 3.3V bias under dynamic RF envelope conditions. IC Role / Device Role / Timing Role: High-efficiency step-down converter with voltage positioning to suppress load-induced ripple during PA transmit bursts. Use Value: Internal soft-start limits inrush during PA enable; ±1.5% output accuracy ensures consistent amplifier gain and linearity. |
| Portable Medical Sensors | Industrial Handheld Terminals |
Use Scenario: Powers low-power microcontrollers and analog front-ends in battery-operated glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting 3.0V–4.2V Li+ voltage to 1.25V–3.3V rails for mixed-signal SoCs and ADC references. Use Value: 0.1μA shutdown current enables multi-month shelf life; TDFN-6 footprint saves PCB area in compact enclosures. | Use Scenario: Delivers regulated power to ARM Cortex-M based controllers and display drivers in ruggedized field terminals. IC Role / Device Role / Timing Role: Main system supply with robust UVLO (1.95V) and wide input range (2.5V–5.5V) tolerating brownouts and battery sag. Use Value: 1454.5mW thermal rating supports operation up to +85°C ambient; synchronous design avoids external diode thermal derating. |
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/2.5V/3.3V outputs only; no adjustable FB pin; 3.6V max input; 300mA rated. | Limited to preset voltages; unsuitable for custom rail generation; lower current capability. | Select only if fixed 3.3V/2.5V output and <300mA load suffice and TDFN-6 footprint compatibility is verified. |
| RT8059GJ6 | Adjustable output (0.6V–5.5V); 600mA rated; 2.5V–5.5V input; 30μA IQ; but uses SOT23-6, not TDFN. | Higher current and lower IQ, but larger thermal resistance (8.7mW/°C vs. 18.2mW/°C) limits high-temp performance. | Prefer when higher output current is needed and board layout accommodates SOT23-6; avoid in thermally constrained TDFN-only footprints. |
Compared with TPS62231DRYR and RT8059GJ6, the MAX1920ETT+T uniquely combines adjustable output, TDFN-6 thermal performance, and voltage-positioning support for ceramic capacitors-making it optimal for compact, battery-sensitive designs requiring custom rail voltages and robust transient behavior.
Availability
MAX1920ETT+T is available at Aetrix Electronics and suitable for mobile baseband power, RF power amplifier bias, portable medical sensors, and industrial handheld terminals requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX1920ETT+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX1920/MAX1921 product line was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered handheld electronics-emphasizing low IQ, small external components, and robust transient response in minimal PCB area.
FAQ
What is the maximum output current capability of the MAX1920ETT+T?
The MAX1920ETT+T guarantees 400mA continuous output current across its full operating temperature range (–40°C to +85°C). This rating assumes proper thermal management using the TDFN-6 package and recommended external components (e.g., 4.7μH inductor, 4.7μF ceramic output capacitor). Peak current capability reaches 730mA due to internal high-side current limiting, but sustained delivery beyond 400mA may cause thermal shutdown or reduced regulation accuracy.
Does the MAX1920ETT+T require an external Schottky diode?
No, the MAX1920ETT+T does not require an external Schottky diode. It integrates both high-side and low-side synchronous MOSFETs, enabling fully synchronous rectification. This architecture improves conversion efficiency to over 90%, eliminates reverse recovery losses, and reduces thermal stress compared to asynchronous buck converters-directly confirmed in the device's General Description and Pin Description sections.
What is the function of the FB pin on the MAX1920ETT+T?
The FB (Feedback) pin on the MAX1920ETT+T is the voltage-sense input for the internal error amplifier. It regulates the output voltage by comparing a divided-down sample of VOUT to a precise 1.25V reference. The device sets VOUT = 1.25V × (1 + R1/R2), where R1 and R2 form an external resistive divider from VOUT to GND. This adjustable architecture distinguishes the MAX1920ETT+T from the fixed-output MAX1921 series.
Can the MAX1920ETT+T operate from a 2.0V input source?
No, the MAX1920ETT+T cannot reliably operate from a 2.0V input. Its specified input voltage range is 2.5V to 5.5V, as stated in the Electrical Characteristics table. While the MAX1921 variants (e.g., MAX1921EUT15) support 2.0V minimum input, the MAX1920 family-including MAX1920ETT+T-requires ≥2.5V to ensure proper UVLO release (1.95V rising threshold) and stable switching operation. Attempting 2.0V input will result in undervoltage lockout and no output regulation.
Is the MAX1920ETT+T pin-compatible with the MAX1920EUT+T?
No, the MAX1920ETT+T is not pin-compatible with the MAX1920EUT+T. The MAX1920ETT+T uses a 6-pin TDFN package with pin 1 = IN, pin 2 = AGND, pin 3 = SHDN, pin 4 = LX, pin 5 = PGND, pin 6 = FB. In contrast, the MAX1920EUT+T uses a 6-pin SOT23-6 package with pin 1 = IN, pin 2 = AGND, pin 3 = SHDN, pin 4 = OUT/FB, pin 5 = PGND, pin 6 = LX. The pin assignments for LX and FB differ, and the land patterns are incompatible-requiring separate PCB layouts.
MAX1920ETT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TDFN (3x3)
MAX1920ETT+T FAQ
1.How can I place an order for MAX1920ETT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1920ETT+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 MAX1920ETT+T reliable?
The price and inventory of MAX1920ETT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1920ETT+T is usually 5 days.
3.What payment methods are accepted for MAX1920ETT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1920ETT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1920ETT+T?
MAX1920ETT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1920ETT+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 MAX1920ETT+T?
For technical support, including MAX1920ETT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1920ETT+T requirements.
6.How does Aetrix verify that MAX1920ETT+T is sourced from the original manufacturer or authorized distributors?
All MAX1920ETT+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 MAX1920ETT+T meets industry standards.
7.What is the process for return or replacement of MAX1920ETT+T?
All MAX1920ETT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1920ETT+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 MAX1920ETT+T part is unused and in its original packaging.
Return procedure for MAX1920ETT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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