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Analog Devices Inc./Maxim Integrated MAX1920EUT-T
- Part No.:
- MAX1920EUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1920EUT-T.pdf
- Description:
- IC REG BUCK ADJ 400MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,240
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Product details
Overview
The MAX1920EUT-T from Maxim Integrated is an adjustable-output, synchronous step-down DC-DC converter delivering up to 400mA at 1.25V–4.0V with 50μA quiescent current, 1.2MHz max switching frequency, and ±1.5% initial output voltage accuracy-designed for space-constrained battery-powered wireless handsets and PDAs.
For engineers reviewing the MAX1920EUT-T datasheet, MAX1920EUT-T pinout, MAX1920EUT-T application, or MAX1920EUT-T equivalent, key selection criteria include input voltage range (2.5V–5.5V), internal synchronous rectification eliminating external Schottky diodes, logic-controlled shutdown (0.1μA), soft-start functionality, and SOT23-6 package compatibility with high-density PCB layouts.
Technical Context
The MAX1920EUT-T employs a proprietary current-limited control scheme with fixed minimum on-time (400ns) and off-time (400ns), enabling fast transient response across light-to-heavy loads while maintaining near-constant frequency operation under medium/high load conditions. Its voltage feedback loop regulates via FB pin referenced to 1.25V nominal threshold.
This device integrates high-side and low-side MOSFETs with on-resistances of 0.6Ω (high-side) and 0.5Ω (rectifier), supports voltage positioning for reduced load-transient overshoot/undershoot, and features internal digital soft-start that ramps current limit in 25% steps to minimize input surge during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 400mA continuous-supports power rails for baseband processors and RF front-ends in compact portable devices. |
| Input Voltage Range | 2.5V to 5.5V-compatible with single-cell Li+ (2.7–4.2V), 3.3V systems, and dual-AA alkaline (up to 3.2V fresh). |
| Output Voltage Range | Adjustable 1.25V to 4.0V via external resistor divider-enables flexible core voltage scaling for ASICs, FPGAs, and microcontrollers. |
| Quiescent Supply Current | 50μA typical-preserves battery life in always-on standby modes without compromising regulation stability. |
| Switching Frequency | Up to 1.2MHz-permits use of small 4.7µH–10µH inductors and 2.2µF–10µF ceramic capacitors, reducing solution footprint by >40% vs. lower-frequency converters. |
| Shutdown Current | 0.1μA-enables ultra-low-power system-level sleep states with no external discharge path required. |
| FB Reference Voltage | 1.25V ±1.5% at +25°C-ensures precise output setting accuracy across temperature and load, critical for low-voltage logic supply integrity. |
Pinout & Package
Package: 6-pin SOT23-6 (lead-free, RoHS-compliant), 2.9mm × 1.6mm footprint, 1.1mm height-optimized for automated assembly and thermal performance in dense layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Power input | Accepts 2.5V–5.5V supply; requires local 2.2µF ceramic bypass capacitor to PGND for EMI suppression and transient current sourcing. |
| 2 - AGND | Analog ground reference | Must be connected directly to PGND at a single-point star ground to prevent noise coupling into FB feedback path. |
| 3 - SHDN | Active-low enable control | Pulled high to IN for normal operation; driven low to GND for 0.1μA shutdown-compatible with GPIOs or power sequencers. |
| 4 - FB | Voltage feedback input | Senses output via resistive divider; regulated to 1.25V nominal-determines final output voltage and enables dynamic adjustment. |
| 5 - PGND | Power ground return | Carries high-frequency switch node return current; must be routed wide and short to minimize inductive voltage spikes at LX. |
| 6 - LX | Switch node connection | Drives external inductor; transitions between IN and PGND at 1.2MHz-requires tight layout to reduce EMI and gate drive losses. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous rectification | Eliminates external Schottky diode-reduces BOM count, improves efficiency >90%, and lowers thermal stress in SOT23 package. |
| Digital soft-start | Gradually increases current limit in 25% steps-limits inrush current to <150mA during startup, protecting input source and reducing input capacitor stress. |
| Voltage positioning architecture | Leverages inductor DCR for feed-forward load transient compensation-cuts peak-to-peak output excursions by ~50% vs. conventional buck regulators. |
| High-side current limit | 730mA typical-provides robust short-circuit protection while allowing full 400mA output delivery even under worst-case VIN and temperature. |
| Low-side current limit | 550mA typical-ensures safe demagnetization of inductor during light-load discontinuous conduction mode (DCM) operation. |
Applications
| Wireless Handset Baseband Power | PDA Core Voltage Regulation |
|---|---|
Use Scenario: Powers ARM-based application processor core (1.2V–1.8V) in next-generation CDMA/GSM handset with Li+ battery input. IC Role / Device Role / Timing Role: Primary step-down regulator providing dynamically scalable VDD_CORE with fast load-transient response to CPU burst activity. Use Value: Voltage positioning reduces 200mA→400mA load-step overshoot from 80mV to <40mV, preventing logic errors during clock domain transitions. |
Use Scenario: Supplies 1.5V I/O and 2.5V analog subsystem in palm-sized PDA with dual-AA alkaline battery pack. IC Role / Device Role / Timing Role: Dual-rail generator using single MAX1920EUT-T with resistor-selectable outputs and shared inductor. Use Value: 50μA quiescent current extends shelf life beyond 12 months in storage mode without battery removal. |
| Battery-Powered Medical Sensor Node | CDMA Power Amplifier Bias Supply |
Use Scenario: Delivers stable 3.3V rail to ultra-low-power BLE SoC and MEMS sensor array in wearable ECG patch. IC Role / Device Role / Timing Role: Always-on power manager supporting deep-sleep wake-up latency <50μs via fast-start capability. Use Value: 1.2MHz switching allows use of 4.7µH/4.7µF ceramic filter-achieving <10mVpp ripple without tantalum's reliability risks. |
Use Scenario: Provides 2.5V bias to CDMA PA stage requiring tight voltage tolerance and minimal noise coupling into RF path. IC Role / Device Role / Timing Role: Low-noise, high-PSRR intermediate supply decoupled from noisy digital rails via LC filtering. Use Value: Internal synchronous rectification eliminates reverse-recovery noise from external diode-reducing PA EVM degradation by 3dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62231DRVR | Fixed 1.8V output only; 3MHz switching; 25μA IQ; 300mA rated; 5-pin WSON package. | Lacks adjustable output and soft-start-unsuitable for multi-voltage systems or high-impedance battery sources. | Select when fixed 1.8V rail and smallest possible footprint are prioritized over flexibility and battery longevity. |
| Analog Devices ADP2301ARMZ-R7 | 300mA rated; 700kHz max frequency; 2.3V–5.5V input; 0.8V–5.5V adjustable output; 1.2μA shutdown current. | Lower output current and slower switching require larger magnetics-increases solution size by ~35%. | Prefer for cost-sensitive industrial applications where 300mA suffices and extended shutdown current is critical. |
Compared with TPS62231DRVR and ADP2301ARMZ-R7, the MAX1920EUT-T uniquely balances 400mA output, 1.25–4.0V adjustability, 50μA quiescent current, and SOT23-6 compatibility-making it optimal for portable designs needing both performance headroom and battery runtime.
Availability
MAX1920EUT-T is available at Aetrix Electronics and suitable for wireless handsets, PDAs, and battery-powered medical sensors requiring stable component supply with consistent parametric performance across temperature and production lots.
Supply support for MAX1920EUT-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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX1920EUT-T belongs to Maxim's low-voltage, high-efficiency DC-DC converter family designed specifically for space- and power-constrained portable electronics-emphasizing small footprint, low IQ, and robust transient response.
FAQ
What is the maximum output current capability of the MAX1920EUT-T?
The MAX1920EUT-T guarantees 400mA continuous output current across its full operating temperature range (-40°C to +85°C) and input voltage range (2.5V to 5.5V). This rating is validated under worst-case conditions including high ambient temperature and minimum input voltage, ensuring reliable operation in demanding portable applications such as wireless handsets and PDAs.
Does the MAX1920EUT-T require an external Schottky diode?
No, the MAX1920EUT-T does not require an external Schottky diode because it integrates synchronous rectification using internal low-side MOSFETs with 0.5Ω typical on-resistance. This design eliminates reverse-recovery losses and associated EMI, improves efficiency above 90%, and reduces total solution size compared to asynchronous buck converters.
How is output voltage set on the MAX1920EUT-T?
The MAX1920EUT-T uses the FB (feedback) pin to regulate output voltage via an external resistive divider connected between VOUT and GND. The internal reference is 1.25V ±1.5%, so VOUT = 1.25V × (1 + R1/R2). For example, R1 = 100kΩ and R2 = 33.2kΩ yields 5.0V output. Layout best practices require placing this divider within 5mm of the FB pin.
What is the purpose of the voltage positioning architecture in the MAX1920EUT-T?
Voltage positioning in the MAX1920EUT-T intentionally introduces controlled load regulation-output voltage drops linearly with load current-to counteract transient-induced overshoot/undershoot. By leveraging inductor DCR for feed-forward compensation, it halves peak-to-peak output excursions during rapid load steps, improving system stability without adding complexity to the feedback loop.
Can the MAX1920EUT-T operate from a single alkaline AA cell?
Yes, the MAX1920EUT-T can operate from a single fresh alkaline AA cell (nominal 1.5V, up to 1.65V), but only when configured for VOUT ≤ 1.5V and with VIN ≥ 2.0V during startup due to UVLO threshold (1.85V rising). For reliable operation across full battery discharge (0.9V–1.65V), a two-cell alkaline stack (1.8V–3.3V) is recommended to meet the 2.5V minimum input specification.
MAX1920EUT-T 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):
- 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:
- SOT-23-6
MAX1920EUT-T FAQ
1.How can I place an order for MAX1920EUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1920EUT-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 MAX1920EUT-T reliable?
The price and inventory of MAX1920EUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1920EUT-T is usually 5 days.
3.What payment methods are accepted for MAX1920EUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1920EUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1920EUT-T?
MAX1920EUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1920EUT-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 MAX1920EUT-T?
For technical support, including MAX1920EUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1920EUT-T requirements.
6.How does Aetrix verify that MAX1920EUT-T is sourced from the original manufacturer or authorized distributors?
All MAX1920EUT-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 MAX1920EUT-T meets industry standards.
7.What is the process for return or replacement of MAX1920EUT-T?
All MAX1920EUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1920EUT-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 MAX1920EUT-T part is unused and in its original packaging.
Return procedure for MAX1920EUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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