My Inquiry
My Account
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 SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:2,230
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1920EUT+T from Maxim Integrated is a high-efficiency, adjustable-output synchronous step-down DC-DC converter delivering up to 400mA at 1.25V–4.0V output with 50μA quiescent current, 1.2MHz max switching frequency, and internal soft-start - designed for space-constrained battery-powered systems such as 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), ±1.5% initial output accuracy, SOT23-6 package footprint, shutdown current (0.1μA), and synchronous rectification eliminating external Schottky diodes.
Technical Context
The MAX1920EUT+T employs a proprietary current-limited control scheme with fixed minimum on/off times (400ns typ) to maintain regulation across load currents from light to full 400mA while sustaining >90% efficiency. It integrates both high-side and low-side MOSFETs with on-resistances of 0.6Ω (high-side) and 0.5Ω (rectifier), enabling self-contained buck conversion without external power switches.
Feedback is implemented via the FB pin referenced to a 1.25V internal threshold (±1.5% initial accuracy), supporting external resistor-divider programming. The device features logic-controlled active-low shutdown (SHDN), analog ground (AGND) and power ground (PGND) separation, and LX node for inductor connection - all optimized for ceramic-capacitor-based compact designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 400mA continuous - supports single-core microcontrollers and RF power amplifiers without thermal derating in SOT23-6. |
| Input Voltage Range | 2.5V to 5.5V - compatible with single Li+ cells (2.7V–4.2V), 3.3V rails, and 5V USB-supplied systems. |
| Output Voltage Range | Adjustable 1.25V to 4.0V via external resistor divider - enables precise core voltage tuning for ASICs, FPGAs, and DSPs. |
| Quiescent Current | 50μA typical - extends battery life in always-on or low-duty-cycle portable devices. |
| Switching Frequency | Up to 1.2MHz - permits use of small 4.7μH–10μH inductors and 2.2μF–10μF ceramic capacitors, reducing board area by >40% vs. lower-frequency converters. |
| Shutdown Current | 0.1μA - ensures negligible drain during system sleep modes, critical for multi-week standby in handheld instruments. |
| FB Threshold Voltage | 1.25V ±1.5% (25°C), 1.21V–1.28V (–40°C to +85°C) - defines precision of externally set output voltage under temperature variation. |
Pinout & Package
MAX1920EUT+T is housed in a RoHS-compliant, lead-free 6-pin SOT23-6 package (JEDEC MO-178AA), with 1.3mm pitch, 2.9mm × 1.6mm body size, and exposed pad not present - suitable for reflow soldering and high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Power input | Supplies 2.5V–5.5V; requires local 2.2μF ceramic bypass capacitor to PGND for EMI suppression and transient response. |
| 2 - AGND | Analog reference ground | Must be connected to PGND at single point; separates noise-sensitive feedback circuitry from high-current power return paths. |
| 3 - SHDN | Active-low enable control | Pull to GND for 0.1μA shutdown; tie to IN for normal operation; 1.6V VIH threshold ensures compatibility with 1.8V/3.3V logic. |
| 4 - FB | Feedback input | Regulates output by comparing divided output voltage to 1.25V internal reference; connects to resistor divider between VOUT and GND. |
| 5 - PGND | Power ground return | Carries high-frequency inductor current and switch node return; must be routed with low-inductance path to IN capacitor ground. |
| 6 - LX | Switch node | Connects to inductor; carries pulsed current up to 730mA peak; requires short, wide trace to minimize EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, improving efficiency by 8–12% and reducing thermal load in confined spaces. |
| Internal digital soft-start | Gradually ramps current limit in 25% steps to limit inrush current and prevent input rail collapse during startup. |
| Voltage positioning architecture | Uses feed-forward compensation (CFF) with ceramic output caps to halve peak-to-peak output excursions during load transients. |
| High-side current limit | 730mA typical - provides robust overcurrent protection without external sensing, preserving reliability under short-circuit conditions. |
| Low-side current limit | 550mA typical - complements high-side limit to ensure safe operation during light-load discontinuous conduction mode. |
Applications
| Wireless Handset Power Management | Portable Medical Instrumentation |
|---|---|
Use Scenario: Regulating Li+ battery voltage (3.0V–4.2V) to 1.8V for baseband processor and 3.3V for display interface in slim-form-factor smartphones. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable, low-noise supply with fast transient response to handle burst-mode RF transmission. Use Value: 400mA output capability and 50μA quiescent current extend talk time by >12% versus linear regulators; SOT23-6 footprint saves >25mm² PCB area. | Use Scenario: Powering low-power microcontroller, OLED display, and sensor signal chain in handheld glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Single-chip DC-DC solution replacing discrete buck controller + MOSFETs, simplifying BOM and layout validation. Use Value: Internal soft-start prevents brownout during cold-start from alkaline batteries; 0.1μA shutdown current enables multi-month shelf life without battery removal. |
| Industrial Handheld Terminals | Wearable Sensor Nodes |
Use Scenario: Generating 2.5V for ADC reference and 3.3V for Wi-Fi module in ruggedized barcode scanners operating across –20°C to +70°C ambient. IC Role / Device Role / Timing Role: Dual-rail power source with tight line/load regulation (±3% over temperature) ensuring measurement accuracy and radio link stability. Use Value: ±1.5% initial output accuracy and 0.2%/V line regulation minimize calibration drift; SOT23-6 withstands mechanical shock better than TDFN in drop-prone environments. | Use Scenario: Supplying 1.25V to ultra-low-power BLE SoC and 3.0V to MEMS accelerometer in coin-cell–powered fitness trackers. IC Role / Device Role / Timing Role: Adjustable-output buck converter enabling dynamic voltage scaling to match processing load and extend battery cycle count. Use Value: 1.25V–4.0V programmability allows optimal core voltage selection; 1.2MHz switching avoids audible noise and simplifies EMI filtering. |
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 version in same package; 30μA IQ; 3.6V max VIN. | Not suitable where output voltage flexibility (e.g., 1.25V, 2.8V) is required; limited to narrow input range. | Select only when fixed-voltage, ultra-low-IQ operation below 3.6V input is prioritized over adjustability. |
| RT8059GJ6 | Adjustable 0.6V–5.0V output; 25μA IQ; 5.5V max VIN; but requires external MOSFETs and lacks integrated soft-start. | Higher BOM cost and layout complexity; no internal current limiting or soft-start necessitates additional design validation. | Choose only if sub-1V output or higher current (>500mA) is needed and external component count is acceptable. |
Compared with TPS62231DRYR and RT8059GJ6, the MAX1920EUT+T uniquely combines adjustable output, 400mA capability, integrated soft-start, and SOT23-6 packaging - making it optimal for compact, battery-powered systems requiring design flexibility and rapid time-to-market.
Availability
MAX1920EUT+T is available at Aetrix Electronics and suitable for wireless handset power management, portable medical instrumentation, industrial handheld terminals, wearable sensor nodes, and battery-powered embedded controllers requiring stable component supply with full RoHS compliance and extended temperature support (–40°C to +85°C).
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 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 engineered specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered portable electronics - emphasizing minimal external components, low quiescent current, and robust transient performance in SOT23 packaging.
FAQ
What is the maximum output current supported by the MAX1920EUT+T?
The MAX1920EUT+T guarantees 400mA continuous output current across its full operating temperature range (–40°C to +85°C). This rating is validated with proper thermal layout and 2.2μF input/10μF output ceramic capacitors. Peak current capability reaches 730mA due to internal high-side current limiting, enabling reliable operation during transient loads without external current-sense circuitry.
Does the MAX1920EUT+T require an external Schottky diode?
No, the MAX1920EUT+T does not require an external Schottky diode. It integrates both high-side and low-side MOSFETs with synchronous rectification, achieving >90% efficiency and eliminating the forward-voltage drop and thermal losses associated with external diodes. This integration reduces component count, board area, and thermal management complexity in space-constrained designs.
What is the purpose of the FB pin on the MAX1920EUT+T?
The FB (feedback) pin on the MAX1920EUT+T senses the output voltage through an external resistor divider and compares it to an internal 1.25V reference. This closed-loop control maintains regulated output across line, load, and temperature variations. The FB pin's 0.2μA bias current and 5mV hysteresis ensure stable operation with standard 1% resistors, enabling precise output programming from 1.25V to 4.0V.
Can the MAX1920EUT+T operate from a single alkaline cell?
Yes, the MAX1920EUT+T can operate from a single alkaline cell (nominal 1.5V, fresh ~1.6V) when configured for low output voltages (e.g., 1.25V) and using the 2.0V startup voltage specification of the MAX1921 variants - however, the MAX1920EUT+T itself specifies a 2.5V minimum input. For true single-cell alkaline support, the MAX1921EUT15 (1.5V fixed) variant is recommended, as its 2.0V startup threshold accommodates declining cell voltage down to end-of-life (~0.9V under load).
How does the soft-start function work in the MAX1920EUT+T?
The MAX1920EUT+T implements internal digital soft-start by initializing the current limit at 25% of full scale and incrementing it in four 25% steps until reaching 100%. This staged ramp limits inrush current during startup, reducing stress on input capacitors and preventing input rail collapse - especially critical with high-impedance sources like Li+ or alkaline batteries. Soft-start duration is fixed and does not require external components.
MAX1920EUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- 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:
- SOT-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.
MAX1920EUT+T Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
