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Analog Devices Inc./Maxim Integrated MAX1920EUT
- Part No.:
- MAX1920EUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1920EUT.pdf
- Description:
- IC REG BUCK ADJ 400MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:324
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Product details
Overview
MAX1920EUT from Maxim Integrated is an adjustable-output, synchronous step-down DC-DC converter delivering up to 400mA at 1.25V–4.0V with ±1.5% initial output voltage accuracy, 50µA quiescent current, and operation up to 1.2MHz switching frequency in a 6-pin SOT23 package. It targets space-constrained battery-powered systems requiring high efficiency and low standby power.
For engineers reviewing the MAX1920EUT datasheet, MAX1920EUT pinout, MAX1920EUT application, or MAX1920EUT equivalent, key selection criteria include its adjustable feedback architecture (FB pin), internal synchronous rectification, 2V–5.5V input range, soft-start functionality, and compatibility with ceramic output capacitors in compact layouts.
Technical Context
The MAX1920EUT 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 light-load efficiency optimization. Its internal synchronous rectifier eliminates external Schottky diodes and supports >90% peak efficiency across load ranges.
It integrates digital soft-start (25% incremental current limit ramp), logic-controlled shutdown (0.1µA), and voltage positioning via feed-forward compensation (CFF) for reduced load-transient overshoot/undershoot-critical for Li+-powered handheld devices with dynamic load profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 400mA continuous delivery into regulated output |
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li+ (2.7V–4.2V) and 3.3V/5V rails |
| Output Voltage Range | Adjustable 1.25V to 4.0V via external FB resistive divider |
| Quiescent Current | 50µA - enables multi-week standby in always-on portable devices |
| Switching Frequency | Up to 1.2MHz - permits use of sub-10µH inductors and <10µF ceramic output caps |
| FB Threshold Voltage | 1.25V ±3% over –40°C to +85°C - defines regulation setpoint for external resistor network |
| Shutdown Current | 0.1µA - ensures negligible battery drain during system sleep |
Pinout & Package
MAX1920EUT is housed in a lead-free-compatible 6-pin SOT23-6 package (JEDEC MO-178AA, footprint 2.9mm × 2.8mm × 1.3mm). Thermal pad not present; standard SOT23 thermal performance applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Power input supply | Accepts 2.5V–5.5V; requires local 2.2µF ceramic bypass capacitor |
| 2 (AGND) | Analog ground reference | Must be connected to PGND at single-point star ground to minimize noise coupling into FB path |
| 3 (SHDN) | Active-low enable control | Pulled high to IN for operation; driven low for 0.1µA shutdown mode |
| 4 (LX) | Switch node | Connects to inductor; high dv/dt node requiring short, direct routing away from FB/AGND |
| 5 (PGND) | Power ground return | Carries high pulsed currents; must tie to AGND near device to avoid ground bounce |
| 6 (FB) | Feedback voltage sense | Regulates to 1.25V; connects to resistive divider from VOUT to GND for adjustable output setting |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous rectification | Eliminates external Schottky diode, reducing BOM count and improving efficiency by ~5–10% vs. asynchronous designs |
| Digital soft-start | Gradually ramps current limit in 25% steps to suppress inrush current and minimize input capacitor stress |
| Voltage positioning architecture | Uses feed-forward compensation (CFF) to halve peak-to-peak output excursions during load transients |
| High-frequency operation (up to 1.2MHz) | Enables use of 4.7µH–10µH inductors and 4.7µF–10µF X5R/X7R ceramics, shrinking total solution size by >40% vs. 500kHz converters |
| Low quiescent current (50µA) | Extends battery life in always-on applications such as Bluetooth headsets and sensor nodes |
Applications
| Wireless Handset Power Management | Portable Medical Sensor Node |
|---|---|
Use Scenario: Powers baseband processor core rail in next-generation CDMA/GSM handsets with dynamic load from 1mA to 400mA. IC Role / Device Role / Timing Role: Adjustable synchronous buck regulator providing stable 1.8V/2.5V core supply with fast line/load transient response. Use Value: Voltage positioning reduces output deviation to ±15mV during 100mA–400mA load steps, preventing processor brownouts. | Use Scenario: Supplies ultra-low-power microcontroller and analog front-end in wearable ECG patch operating from coin cell. IC Role / Device Role / Timing Role: High-efficiency step-down converter delivering 3.0V at up to 400mA while maintaining 50µA quiescent draw in idle state. Use Value: Enables >6-month battery life with intermittent 200ms active bursts, leveraging soft-start and low-IQ to minimize energy waste. |
| PDAs and Palmtop Systems | Industrial Handheld Terminal |
Use Scenario: Generates 3.3V I/O rail for touch controller, display interface, and SD card slot in palm-sized computing devices. IC Role / Device Role / Timing Role: Compact SOT23 buck converter supporting wide input (2.5V–5.5V) to accommodate aging Li+ cells and USB charging. Use Value: 1.2MHz operation allows 6.8µH inductor and 6.8µF ceramic cap - reducing solution height to <1.2mm and footprint to <12mm². | Use Scenario: Provides regulated 2.5V supply for barcode scanner ASIC and RF transceiver in ruggedized warehouse terminals. IC Role / Device Role / Timing Role: Robust DC-DC converter with –40°C to +85°C operation, internal current limiting, and shutdown control for system-level power sequencing. Use Value: Withstands 1000-cycle thermal cycling and maintains ±3% output accuracy across temperature, ensuring reliable scan engine timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 3.0V output only; no FB pin; 300mA rated; 2.05V–6.5V input | Not adjustable - unsuitable where variable VOUT required | Select only if fixed 3.0V output suffices and 400mA headroom is not needed |
| RT8059GJ6 | Adjustable (0.6V–5.5V); 600mA rated; 2.5V–5.5V input; 1.5MHz max freq | Higher current capability and wider VOUT range but lacks integrated soft-start and voltage positioning | Prefer when higher output current or lower feedback threshold is critical; accept trade-off in transient performance |
Compared with TPS62231DRYR and RT8059GJ6, the MAX1920EUT uniquely combines adjustable output, voltage positioning for tight transient control, and ultra-low 50µA quiescent current - making it optimal for battery-sensitive, dynamically loaded portable systems where layout space and efficiency are co-constrained.
Availability
MAX1920EUT is available at Aetrix Electronics and suitable for wireless handsets, portable medical sensors, PDAs, and industrial handheld terminals requiring stable component supply with long-term manufacturability and RoHS-compliant sourcing options.
Supply support for MAX1920EUT 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 demanding industrial, communications, and consumer applications.
The MAX1920 series belongs to Maxim's low-voltage, high-efficiency DC-DC converter product line, designed specifically for space- and power-constrained portable electronics requiring minimal external components and robust transient behavior.
FAQ
What is the maximum output current supported by the MAX1920EUT?
The MAX1920EUT guarantees continuous output current up to 400mA under specified thermal conditions (TA ≤ +70°C, derated above). This rating assumes proper PCB layout with adequate copper area for heat dissipation and use of recommended external components per the datasheet. Peak current capability is limited by the internal high-side switch current limit (730mA typ), but sustained delivery is validated at 400mA with <±3% output voltage deviation across temperature and line variations. The MAX1920EUT delivers this current while maintaining >90% efficiency at mid-load points.
How does the MAX1920EUT achieve low quiescent current, and why is it important?
The MAX1920EUT achieves 50µA quiescent current through proprietary bias circuitry that powers down nonessential blocks during light-load operation, combined with optimized gate drive and low-leakage process technology. This low IQ directly extends battery runtime in always-on or intermittently active devices - for example, enabling multi-week standby in Bluetooth headsets or months of operation in coin-cell-powered sensor nodes. The MAX1920EUT maintains this 50µA spec across its full input range (2.5V–5.5V) and temperature range (–40°C to +85°C).
Can the MAX1920EUT be used with ceramic output capacitors, and what compensation is required?
Yes, the MAX1920EUT is explicitly optimized for ceramic output capacitors using the Figure 2 application circuit. It requires feed-forward compensation via capacitor CFF connected between LX and FB to stabilize the voltage-positioning loop. For a typical 3.3V output with 10µH inductor, CFF ≈ 3300pF is recommended. This configuration reduces output voltage ripple and halves transient excursions compared to conventional buck regulators - a key design advantage confirmed in MAX1920EUT typical operating characteristics graphs.
What is the function of the FB pin on the MAX1920EUT, and how is it configured?
On the MAX1920EUT, the FB pin is the feedback input that regulates the output voltage to a precise 1.25V reference. It is configured using an external resistive divider (R1 from VOUT to FB, R2 from FB to GND), where VOUT = 1.25V × (1 + R1/R2). The MAX1920EUT's FB bias current is extremely low (0.01–0.20µA), minimizing divider current error. This architecture enables accurate, user-adjustable outputs from 1.25V to 4.0V - distinguishing it from the factory-fixed MAX1921 variants and making the MAX1920EUT ideal for prototyping and multi-voltage designs.
Does the MAX1920EUT include built-in protection features, and how do they operate?
Yes, the MAX1920EUT integrates multiple protection functions: current-limit protection triggers at 525–950mA (high-side) and 350–800mA (low-side) to prevent damage during overload or short-circuit events; thermal shutdown activates at +150°C junction temperature; and UVLO disables operation below 1.5V–1.65V (falling) to prevent erratic startup. These protections operate autonomously without external components. During fault recovery, the MAX1920EUT automatically resumes regulation once conditions normalize - no latch-up or manual reset is required. All protections are fully characterized across temperature and process corners in the MAX1920EUT datasheet.
MAX1920EUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX1920EUT FAQ
1.How can I place an order for MAX1920EUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1920EUT 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 MAX1920EUT reliable?
The price and inventory of MAX1920EUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1920EUT is usually 5 days.
3.What payment methods are accepted for MAX1920EUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1920EUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1920EUT?
MAX1920EUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1920EUT 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 MAX1920EUT?
For technical support, including MAX1920EUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1920EUT requirements.
6.How does Aetrix verify that MAX1920EUT is sourced from the original manufacturer or authorized distributors?
All MAX1920EUT 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 MAX1920EUT meets industry standards.
7.What is the process for return or replacement of MAX1920EUT?
All MAX1920EUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX1920EUT, 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 MAX1920EUT part is unused and in its original packaging.
Return procedure for MAX1920EUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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