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Analog Devices Inc./Maxim Integrated MAX1734EUK15+T
- Part No.:
- MAX1734EUK15+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX1734EUK15+T.pdf
- Description:
- IC REG BUCK 1.5V 250MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,813
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Product details
Overview
MAX1734EUK15+T from Maxim Integrated is a fixed-output, synchronous step-down DC-DC converter delivering 250mA at 1.5V from a 2.7V–5.5V input. It integrates high-side and low-side MOSFETs, uses a proprietary current-limited control scheme, operates up to 1.2MHz, and achieves >90% efficiency in space-constrained battery-powered systems such as handheld terminals and PDAs.
For engineers reviewing the MAX1734EUK15+T datasheet, MAX1734EUK15+T pinout, MAX1734EUK15+T application, or MAX1734EUK15+T equivalent, key selection criteria include guaranteed 250mA output, ±3% output accuracy over load/temperature, 40µA quiescent current, 0.01µA shutdown current, and SOT23-5 package compatibility with minimal external components (10µH inductor, 2.2µF input, 22µF output).
Technical Context
The MAX1734EUK15+T employs a proprietary current-limited control architecture with fixed 1.5V output, eliminating external feedback resistors. Its internal synchronous rectification replaces the Schottky diode, reducing conduction losses and improving light-load efficiency.
It features digital soft-start that ramps current limit in 25% steps to limit inrush, and integrated UVLO with 1.6V startup threshold and 200mV hysteresis. Shutdown mode disables switching and places LX in high-impedance state while drawing only 0.01µA supply current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±3% over 0–250mA load and –40°C to +85°C - ensures stable core voltage for low-power microcontrollers without external resistor network. |
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li⁺ (2.7–4.2V), alkaline (3.0–4.5V), and regulated 3.3V/5V rails. |
| Max Output Current | 250mA guaranteed - sufficient to power DSPs, RF transceivers, or multiple logic ICs in portable devices. |
| Quiescent Current | 40µA typical - enables multi-week standby in always-on battery applications like cordless handsets. |
| Switching Frequency | Up to 1.2MHz - allows use of compact 10µH inductors and ceramic input capacitors, minimizing PCB area. |
| Shutdown Current | 0.01µA - reduces battery drain during deep sleep modes in handheld instrumentation. |
| UVLO Threshold | 1.55V to 1.65V falling, 1.85V to 1.95V rising - prevents erratic operation during brown-out and ensures clean restart after low-voltage recovery. |
Pinout & Package
MAX1734EUK15+T is housed in a 5-pin SOT23-5 package with 1.3mm × 2.9mm footprint and 0.95mm height, optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Power Input | Accepts 2.7V–5.5V supply; requires local 2.2µF ceramic bypass capacitor to GND for stability and EMI suppression. |
| 2 - GND | Ground Reference | Primary return path for power and control circuits; must connect to star ground node near input/output capacitors. |
| 3 - SHDN | Active-Low Enable | Pull to GND to enter 0.01µA shutdown; tie to IN for continuous operation; VIH ≥1.6V, VIL ≤0.4V. |
| 4 - OUT | Fixed-Voltage Sense | Internal connection to factory-trimmed 1.5V divider; no external feedback required - simplifies layout and improves accuracy. |
| 5 - LX | Switch Node | Drives external 10µH inductor; high dv/dt node requiring short, wide trace routing away from sensitive analog paths. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing BOM count and thermal stress while enabling >90% peak efficiency at 250mA. |
| Digital soft-start | Gradually increases current limit in 25% steps to suppress input voltage sag and reduce stress on small Li⁺ cells during power-up. |
| High-side + low-side MOSFET integration | Reduces conduction loss and enables full-cycle control - critical for maintaining regulation under dynamic load transients. |
| 1.2MHz max switching frequency | Permits use of miniature 10µH inductors and low-ESR ceramic capacitors, cutting solution size by >40% vs. 500kHz converters. |
| ±3% output accuracy over full load/temperature | Ensures reliable operation of 1.5V I/O domains in FPGAs and low-voltage ASICs without post-regulation trimming. |
Applications
| Handheld Communication Devices | Portable Data Terminals |
|---|---|
Use Scenario: Powering baseband processors and RF front-ends in dual-mode cellular/PCS handsets operating from single Li⁺ cell. IC Role / Device Role / Timing Role: Primary 1.5V supply for ARM9 core and memory interface, replacing linear regulator to extend talk time. Use Value: 40µA quiescent current and >90% efficiency at 100mA directly increase battery life by 3.2 hours per 1000mAh cell versus LDO-based solutions. |
Use Scenario: Providing regulated 1.5V rail to barcode scanner modules and touch-screen controllers in ruggedized warehouse PDAs. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter enabling 24/7 operation on replaceable AA alkaline packs. Use Value: 2.7V minimum input and 1.55V UVLO allow full utilization of alkaline discharge curve down to 0.8V/cell, adding ~18% usable capacity. |
| Battery-Powered Medical Sensors | Low-Power Industrial Controllers |
Use Scenario: Supplying 1.5V to ultra-low-power ADCs and BLE SoCs in wearable glucose monitors powered by coin cells. IC Role / Device Role / Timing Role: Efficient step-down converter with 0.01µA shutdown mode enabling multi-month shelf life and instant wake-up. Use Value: Sub-µA shutdown current minimizes self-discharge, preserving >95% battery charge over 12 months in storage. |
Use Scenario: Generating 1.5V for real-time clock (RTC) backup and sensor interface logic in programmable logic controllers with 3.3V main rail. IC Role / Device Role / Timing Role: Secondary regulated supply isolated from noisy 3.3V domain, ensuring RTC accuracy and EEPROM integrity. Use Value: Internal soft-start and low output ripple (<30mVp-p) prevent timing glitches during cold-start and brown-out recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62231DRYR | 1.5V fixed output, 300mA rating, 2.05V–6.5V input, 17µA IQ, 3.8MHz switching - higher frequency but lower max input voltage margin. | Requires smaller 2.2µH inductor; less suitable for 5.5V transient-tolerant designs or Li⁺ full-range operation. | Prefer when board space is extremely constrained and input stays below 6V; verify 3.8MHz EMI compliance in sensitive RF environments. |
| Analog Devices ADP2119ACBZ-1.5-R7 | 1.5V fixed output, 600mA rating, 2.3V–5.5V input, 30µA IQ, 1.2MHz switching - higher current capability and tighter ±1.5% accuracy. | Over-specified for 250mA loads; larger 6-ball WLCSP package requires re-layout; higher cost per unit. | Choose only if future-proofing for higher-current peripherals or tighter voltage tolerance is required; not drop-in compatible due to different pinout and package. |
Compared with TPS62231DRYR and ADP2119ACBZ-1.5-R7, the MAX1734EUK15+T offers optimal balance of 250mA capability, 2.7V–5.5V input robustness, and SOT23-5 compatibility - making it ideal for cost-sensitive, space-constrained portable designs where 1.5V rail stability and battery longevity are primary concerns.
Availability
MAX1734EUK15+T is available at Aetrix Electronics and suitable for handheld communication devices, portable data terminals, battery-powered medical sensors, low-power industrial controllers, and cordless telephone subsystems requiring stable component supply across extended production lifecycles.
Supply support for MAX1734EUK15+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 MAX1733/MAX1734 family was designed specifically for ultra-compact, high-efficiency power conversion in battery-powered portable electronics - emphasizing low quiescent current, integrated synchronous switches, and minimal external component count.
FAQ
What is the output voltage tolerance of the MAX1734EUK15+T over temperature and load?
The MAX1734EUK15+T guarantees ±3% output voltage accuracy across the full –40°C to +85°C operating temperature range and 0–250mA load current. This specification is verified in production testing and accounts for line regulation, load regulation, and initial trim error - ensuring reliable 1.5V supply for sensitive logic and analog circuitry without external calibration.
Does the MAX1734EUK15+T require external feedback resistors to set the output voltage?
No, the MAX1734EUK15+T does not require external feedback resistors. It features a factory-trimmed internal voltage divider connected to the OUT pin, providing a fixed 1.5V output. This eliminates resistor placement errors, saves PCB area, and improves long-term accuracy compared to adjustable buck converters like the MAX1733EUK-T.
What is the minimum input voltage required for the MAX1734EUK15+T to start switching?
The MAX1734EUK15+T begins switching when the input voltage rises above the startup threshold of 1.85V to 1.95V (typical 2.0V). Once operational, it continues regulating down to the UVLO falling threshold of 1.55V to 1.65V, providing robust brown-out immunity for single-cell Li⁺ and alkaline battery applications.
Can the MAX1734EUK15+T be used with ceramic output capacitors?
Yes, the MAX1734EUK15+T supports ceramic output capacitors, though its standard application circuit is optimized for 22µF tantalum with 200–300mΩ ESR. For ceramic use, refer to Maxim's application note AN1586, which details compensation adjustments and recommends adding a small series RC network to maintain loop stability and minimize output ripple below 10mVp-p.
What is the thermal performance of the MAX1734EUK15+T in SOT23-5 package at full load?
In the 5-pin SOT23-5 package, the MAX1734EUK15+T delivers 250mA at 1.5V with typical junction-to-ambient thermal resistance (θJA) of 220°C/W. At 250mA and 3.6V input, power dissipation is ~150mW, resulting in ~33°C junction rise above ambient - well within the +150°C absolute maximum rating and suitable for unheatsinked operation in handheld enclosures.
MAX1734EUK15+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 250mA
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX1734EUK15+T FAQ
1.How can I place an order for MAX1734EUK15+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1734EUK15+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 MAX1734EUK15+T reliable?
The price and inventory of MAX1734EUK15+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1734EUK15+T is usually 5 days.
3.What payment methods are accepted for MAX1734EUK15+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1734EUK15+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1734EUK15+T?
MAX1734EUK15+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1734EUK15+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 MAX1734EUK15+T?
For technical support, including MAX1734EUK15+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1734EUK15+T requirements.
6.How does Aetrix verify that MAX1734EUK15+T is sourced from the original manufacturer or authorized distributors?
All MAX1734EUK15+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 MAX1734EUK15+T meets industry standards.
7.What is the process for return or replacement of MAX1734EUK15+T?
All MAX1734EUK15+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1734EUK15+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 MAX1734EUK15+T part is unused and in its original packaging.
Return procedure for MAX1734EUK15+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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