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Analog Devices Inc./Maxim Integrated MAX1734EUK15+
- Part No.:
- MAX1734EUK15+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX1734EUK15+.pdf
- Description:
- IC REG BUCK 1.5V 250MA SOT23-5
- Quantity:
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Inventory:4,469
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Product details
Overview
The MAX1734EUK15+ 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, featuring 40µA quiescent current, 1.2MHz max switching frequency, and internal soft-start-designed for battery-powered handheld devices requiring compact, high-efficiency power conversion.
For engineers reviewing the MAX1734EUK15+ datasheet, MAX1734EUK15+ pinout, MAX1734EUK15+ application, or MAX1734EUK15+ equivalent, key selection criteria include guaranteed 250mA output, ±3% output voltage accuracy over load/temperature, shutdown current of 0.01µA, SOT23-5 package compatibility, and absence of external diode requirement due to integrated synchronous rectification.
Technical Context
The MAX1734EUK15+ employs a proprietary current-limited control scheme with fixed 1.5V output derived from an internal resistor divider connected to the OUT pin-not adjustable via external feedback. Its operation relies on minimum on-time (0.25–0.55µs) and off-time (0.25–0.55µs) constraints to maintain regulation across light-to-heavy loads while enabling up to 1.2MHz switching.
Internal synchronous rectification replaces the external Schottky diode, using complementary high-side (RONP ≤ 1.1Ω) and low-side (RONN ≤ 1.6Ω) MOSFETs. Shutdown mode disables all switching and reduces supply current to 0.01µA, with LX entering high-impedance state-critical for ultra-low-power standby in portable systems.
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 network redesign. |
| 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 without external pre-regulation. |
| Quiescent Current | 40µA typical-minimizes battery drain during active operation, extending runtime in always-on subsystems. |
| Shutdown Current | 0.01µA-reduces system standby power to negligible levels, essential for long-duration sleep modes. |
| Switching Frequency | Up to 1.2MHz-permits use of small 10µH inductors and 2.2µF ceramic input capacitors, shrinking total solution size. |
| Output Current | 250mA guaranteed-sufficient for powering core logic, RF front-ends, or display drivers in space-constrained PDAs and handsets. |
| Efficiency | >90% typical at 250mA (VIN = 3.6V, VOUT = 1.5V)-reduces thermal load and improves battery life versus linear regulators. |
Pinout & Package
Package: 5-pin SOT23-5 (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, 0.95mm pitch.
| 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 input/output currents; must connect to star ground node near IN and OUT capacitors. |
| 3 - SHDN | Active-low enable | Pull to GND for shutdown (0.01µA IQ); tie to IN for normal operation; VIH ≥ 1.6V, VIL ≤ 0.4V. |
| 4 - OUT | Output voltage sense | Internally connected to fixed 1.5V divider; no external feedback required-simplifies layout and eliminates resistor tolerance error. |
| 5 - LX | Switch node | Connects to inductor; carries high di/dt switching current; requires short, wide trace and separation from sensitive analog nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing BOM count, board area, and conduction losses-directly enabling >90% efficiency. |
| Digital soft-start | Gradually ramps current limit in 25% steps at startup, limiting inrush into input capacitors and preventing brownout in high-impedance battery sources. |
| High-frequency operation | 1.2MHz max switching allows 10µH inductor and 2.2µF input capacitor-cutting solution footprint by >40% vs. 500kHz converters. |
| Ultra-low shutdown current | 0.01µA shutdown IQ enables multi-week standby in remote sensors or wearable devices without battery replacement. |
| Integrated current limiting | High-side limit (300–565mA) and low-side limit (200–430mA) protect against short-circuit and overload without external sensing components. |
Applications
| Cellular Handset Core Power | PDAs and Palmtop Processors |
|---|---|
|
Use Scenario: Powers baseband processor core rail in GSM/PCS handsets operating from single Li+ cell (2.7–4.2V). IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 1.5V/250mA with fast transient response to handle burst-mode processing loads. Use Value: Replaces inefficient linear regulator, improving talk-time by >25% and eliminating thermal derating concerns in sealed handset enclosures. |
Use Scenario: Supplies 1.5V logic rail for ARM-based palmtop CPUs and SRAM during active computing sessions. IC Role / Device Role / Timing Role: High-efficiency buck converter with soft-start, ensuring clean power-up sequencing and avoiding reset glitches. Use Value: Enables use of smaller 10µH inductor and 2.2µF ceramic input cap-reducing total power stage area to <12mm² on dense PDA PCBs. |
| Battery-Powered Medical Sensors | Cordless Telephone Baseband ICs |
|
Use Scenario: Powers ultra-low-power ECG sensor ASIC from coin-cell or AAA alkaline batteries (3.0–4.5V). IC Role / Device Role / Timing Role: Main DC-DC converter operating in discontinuous conduction mode at light loads, maintaining 40µA IQ. Use Value: Extends battery life to >12 months in intermittent-readout mode while supporting 250mA peak for wireless transmission bursts. |
Use Scenario: Generates 1.5V supply for DECT cordless phone baseband ICs powered from 5V wall adapter or NiMH pack. IC Role / Device Role / Timing Role: Fixed-output buck regulator with shutdown control synchronized to handset presence detection. Use Value: Reduces standby power to 0.01µA when handset is docked, cutting base station no-load consumption below 5mW. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck 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-requires larger input capacitance due to higher fSW. | Higher switching frequency enables smaller inductors but increases EMI sensitivity; lacks UVLO hysteresis (1.65V/1.45V) vs. MAX1734's 200mV. | Preferred where board space is extreme and EMI filtering is feasible; not drop-in due to different pinout and higher VIN min. |
| Analog Devices ADP2105AUJZ-1.5-R7 | 1.5V fixed, 600mA output, 2.3V–5.5V input, 25µA IQ, 3MHz fSW, integrated compensation-requires no external compensation components. | Higher current capability and faster transient response suit bursty loads; larger 6-pin TSOT-23 package increases footprint by 35%. | Selected when future-proofing for higher load headroom or simplifying design validation; not pin-compatible with SOT23-5. |
Compared with TPS62231DRYR and ADP2105AUJZ-1.5-R7, the MAX1734EUK15+ offers the smallest footprint (SOT23-5), lowest shutdown current (0.01µA), and proven 1.2MHz operation with minimal external components-making it optimal for legacy-replacement and cost-sensitive portable designs where layout simplicity and ultra-low standby power are critical.
Availability
MAX1734EUK15+ is available at Aetrix Electronics and suitable for cellular handsets, PDAs, battery-powered medical sensors, and cordless telephones requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
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 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 space-constrained, battery-operated portable electronics-delivering high-efficiency DC-DC conversion with minimal external components and ultra-low quiescent current to maximize runtime.
FAQ
What is the output voltage tolerance of the MAX1734EUK15+ over temperature and load?
The MAX1734EUK15+ 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 per the Electrical Characteristics table in the official datasheet, with typical deviation under ±1.5% at 25°C and zero load. The fixed 1.5V output is set by an internal precision resistor divider, eliminating external component drift effects.
Does the MAX1734EUK15+ require an external Schottky diode?
No, the MAX1734EUK15+ does not require an external Schottky diode. It integrates synchronous rectification using internal high-side and low-side MOSFETs, which replace the diode in conventional buck topologies. This design achieves over 90% efficiency and eliminates reverse recovery losses, thermal stress, and board space associated with discrete diodes.
What is the minimum input voltage required to start up the MAX1734EUK15+?
The MAX1734EUK15+ has a startup voltage (VSTART) of 2.0V (typical) with 200mV hysteresis. It begins switching when the input voltage rises above 1.95–2.05V and remains operational down to the UVLO falling threshold of 1.55–1.65V. This ensures reliable turn-on from partially discharged Li+ cells or alkaline batteries without external supervision circuitry.
Can the MAX1734EUK15+ be used with ceramic output capacitors?
Yes, the MAX1734EUK15+ supports ceramic output capacitors, though its standard application uses 22µF tantalum for stability. For ceramic use, refer to Maxim's AN6137 or the MAX1733 ceramic-capacitor circuit (Figure 3 in datasheet), which relocates feedback sensing to the LX node. This configuration maintains loop stability with 2.2–4.7µF X7R ceramics and reduces output ripple to <10mVp-p.
What is the thermal performance of the MAX1734EUK15+ in SOT23-5 package?
In the 5-pin SOT23-5 package, the MAX1734EUK15+ has a maximum continuous power dissipation of 571mW at +70°C ambient, derating 7.1mW/°C above that temperature. Junction-to-ambient thermal resistance (θJA) is approximately 175°C/W. At 250mA output and 3.6V input, typical power dissipation is ~125mW, resulting in <22°C junction rise-well within the +150°C absolute maximum rating.
MAX1734EUK15+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
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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