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Analog Devices Inc./Maxim Integrated MAX1734EUK15
- Part No.:
- MAX1734EUK15
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX1734EUK15.pdf
- Description:
- IC REG BUCK 1.5V 250MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,172
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Product details
Overview
MAX1734EUK15 from Maxim Integrated is a fixed-output, synchronous step-down DC-DC converter delivering 250mA at 1.5V with ±3% output voltage accuracy over 0–250mA load, 2.7–5.5V input range, and 40µA quiescent current-designed for powering low-voltage logic rails in battery-powered handheld devices.
For engineers reviewing the MAX1734EUK15 datasheet, MAX1734EUK15 pinout, MAX1734EUK15 application, or MAX1734EUK15 equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency behavior at 1.5V output, and real-world alternative selection guidance for space-constrained portable power designs.
Technical Context
The MAX1734EUK15 implements a proprietary current-limited control scheme with minimum on/off times of 0.25–0.55µs, enabling stable operation across light to heavy loads while maintaining up to 1.2MHz switching frequency. Its internal synchronous rectifier eliminates external Schottky diodes and improves efficiency beyond 90% at 250mA into 1.5V.
It features digital soft-start limiting inrush current, active-low shutdown reducing supply current to 0.01µA, and factory-trimmed 1.5V output sensed via dedicated OUT pin-distinct from the adjustable MAX1733's FB pin architecture. UVLO triggers at 1.55–1.65V with 200mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±3% over 0–250mA load and -40°C to +85°C - enables direct replacement of LDOs without feedback resistor network. |
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li+ (2.7–4.2V), alkaline, or regulated 3.3V/5V rails without external pre-regulation. |
| Quiescent Current | 40µA typical - preserves battery life in always-on or low-duty-cycle portable systems. |
| Shutdown Current | 0.01µA - reduces system standby power to nanoampere level when SHDN is pulled low. |
| Switching Frequency | Up to 1.2MHz - allows use of compact 10µH inductor and 2.2µF ceramic input capacitor, minimizing board area. |
| Output Current | Guaranteed 250mA continuous - sufficient for powering core logic, RF ICs, or microcontrollers in PDAs and cordless handsets. |
| Efficiency | >90% at 250mA (VIN = 3.6V, VOUT = 1.5V) - reduces thermal load vs. linear regulators and extends runtime. |
Pinout & Package
MAX1734EUK15 is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA, footprint U5-1*), with 0.95mm pitch, 2.9mm × 1.6mm body, and exposed pad not electrically connected. Thermal performance supports 571mW at TA = +70°C with 7.1mW/°C derating above.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power input | Accepts 2.7–5.5V; requires local 2.2µF ceramic bypass to GND for stability and EMI suppression. |
| 2 GND | Ground reference | Primary return path for input/output currents; must connect to star ground node near IN/CIN/LX. |
| 3 SHDN | Active-low enable | Pull low to enter 0.01µA shutdown; tie to IN for normal operation; VIH ≥ 1.6V, VIL ≤ 0.4V. |
| 4 OUT | Fixed-output sense | Internal connection to factory-set 1.5V divider; no external components required-unlike FB-based variants. |
| 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, improving efficiency >90% and reducing BOM count and thermal footprint. |
| Digital soft-start | Gradually ramps current limit in 25% steps at startup, limiting inrush and relaxing input capacitor RMS current rating. |
| High-frequency operation | 1.2MHz max switching enables miniature passive components: 10µH inductor and 2.2µF ceramic input cap. |
| Low-noise regulation | ±3% output accuracy over full load/temperature ensures reliable logic-level compliance for 1.5V I/O domains. |
| UVLO with hysteresis | 1.55–1.65V falling threshold with 200mV hysteresis prevents oscillation during brownout recovery. |
Applications
| Cellular Handset Core Supply | PDAs and Palmtop Logic Rail |
|---|---|
|
Use Scenario: Powers baseband processor core voltage (1.5V) from single Li+ cell in GSM/PCS handsets. IC Role / Device Role / Timing Role: Primary step-down regulator replacing inefficient linear regulators to extend talk time. Use Value: Delivers 250mA at >90% efficiency across 2.7–4.2V input, reducing heat and extending battery runtime by ~35% vs. LDO. |
Use Scenario: Supplies 1.5V I/O or memory interface rail in palm-sized computing devices with tight PCB area budgets. IC Role / Device Role / Timing Role: Compact, fixed-output DC-DC converter enabling high-density layout with minimal external components. Use Value: 5-pin SOT23 footprint and 1.2MHz operation allow full solution in <12mm², including inductor and capacitors. |
| Cordless Telephone Baseband | Battery-Powered Industrial Sensor Node |
|
Use Scenario: Provides stable 1.5V supply to DSP and codec in DECT cordless phone handsets operating from 2×AA alkaline cells. IC Role / Device Role / Timing Role: Input-wide buck converter maintaining regulation down to 2.7V, supporting full battery discharge cycle. Use Value: 40µA quiescent current and 0.01µA shutdown minimize self-discharge, enabling multi-month shelf life in standby mode. |
Use Scenario: Powers ultra-low-power microcontroller and wireless transceiver (e.g., BLE SoC) in remote sensor nodes powered by coin cell or small Li+. IC Role / Device Role / Timing Role: High-efficiency, low-IQ DC-DC stage boosting usable energy from marginal input sources. Use Value: Maintains >85% efficiency even at 10mA load, extracting maximum runtime from limited battery capacity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62231DRYR | 1.5V fixed, 300mA, 2.05–6.0V input, 17µA IQ, 3.8MHz switching - smaller IQ but higher fSW demands tighter layout. | Requires 0402/0603 passives; better for high-density wearables where size outweighs cost. | Choose for lower quiescent current and higher frequency if PCB layout supports fast switching noise control. |
| Analog Devices ADP2301AUJZ-1.5-R7 | 1.5V fixed, 600mA, 3.0–20V input, 2.5mA IQ, 700kHz fSW - wider VIN but much higher IQ and larger SOT23-6 package. | Targets industrial inputs (e.g., 12V rails); unsuitable for single-cell battery due to 3V min VIN. | Choose only if input exceeds 3.0V and higher output current or input voltage range is required. |
Compared with MAX1734EUK15, the TPS62231DRYR offers lower IQ and higher integration at the cost of stricter layout constraints, while the ADP2301AUJZ-1.5-R7 trades battery compatibility for industrial input flexibility and higher current capability-neither is pin-compatible, and both require schematic and layout revision.
Availability
MAX1734EUK15 is available at Aetrix Electronics and suitable for cellular handsets, PDAs, cordless telephones, and battery-powered sensor nodes requiring stable component supply with long lifecycle visibility and RoHS-compliant sourcing options.
Supply support for MAX1734EUK15 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 solutions for portable, industrial, and communications systems.
The MAX1733/MAX1734 product line was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered handheld equipment where board space and energy efficiency are critical constraints.
FAQ
What is the guaranteed output current capability of the MAX1734EUK15?
The MAX1734EUK15 guarantees 250mA continuous output current into a 1.5V load across the full operating temperature range (-40°C to +85°C) and input voltage range (2.7V to 5.5V), as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.
Does the MAX1734EUK15 require external feedback resistors to set its output voltage?
No, the MAX1734EUK15 does not require external feedback resistors. It features a factory-preset 1.5V output implemented via an internal resistor divider connected to the OUT pin-unlike the adjustable MAX1733, which uses the FB pin and external resistors.
What is the shutdown current specification for the MAX1734EUK15?
The MAX1734EUK15 draws only 0.01µA (10nA) typical supply current in shutdown mode when the SHDN pin is pulled low, as specified in the Electrical Characteristics table under "Shutdown Supply Current" at TA = +25°C.
Can the MAX1734EUK15 operate from a single Li+ cell across its full discharge curve?
Yes, the MAX1734EUK15 operates from 2.7V to 5.5V input, covering the entire useful discharge range of a single Li+ cell (2.7V–4.2V). Its 1.95V startup voltage and 1.55–1.65V UVLO ensure reliable turn-on and graceful shutdown during battery depletion.
Is the MAX1734EUK15 pin-compatible with the MAX1734EUK18?
Yes, the MAX1734EUK15 and MAX1734EUK18 share identical pinout, package (SOT23-5), and electrical interface-only the factory-set output voltage differs (1.5V vs. 1.8V). Both use the same OUT pin configuration and require no PCB changes for substitution within compatible voltage-margin designs.
MAX1734EUK15 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Up to 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX1734EUK15 FAQ
1.How can I place an order for MAX1734EUK15 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1734EUK15 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 reliable?
The price and inventory of MAX1734EUK15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1734EUK15 is usually 5 days.
3.What payment methods are accepted for MAX1734EUK15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1734EUK15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1734EUK15?
MAX1734EUK15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1734EUK15 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?
For technical support, including MAX1734EUK15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1734EUK15 requirements.
6.How does Aetrix verify that MAX1734EUK15 is sourced from the original manufacturer or authorized distributors?
All MAX1734EUK15 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 meets industry standards.
7.What is the process for return or replacement of MAX1734EUK15?
All MAX1734EUK15 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1734EUK15, 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 part is unused and in its original packaging.
Return procedure for MAX1734EUK15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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