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Analog Devices Inc./Maxim Integrated MAX1733EUK+T
- Part No.:
- MAX1733EUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX1733EUK+T.pdf
- Description:
- IC REG BUCK ADJ 250MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,351
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Product details
Overview
MAX1733EUK+T from Maxim Integrated is a synchronous step-down DC-DC converter delivering 250mA output current with adjustable output voltage (1.25V to 2.0V), 40µA quiescent supply current, and up to 1.2MHz switching frequency in a 5-pin SOT23 package. It serves as a high-efficiency replacement for linear regulators in space-constrained battery-powered systems such as PDAs and cordless telephones.
For engineers reviewing the MAX1733EUK+T datasheet, MAX1733EUK+T pinout, MAX1733EUK+T application, or MAX1733EUK+T equivalent, key selection criteria include its internal synchronous rectification, ±1.5% initial output accuracy, 2.7V–5.5V input range, logic-controlled shutdown (0.01µA), and soft-start functionality for low-input-impedance sources like Li+ cells.
Technical Context
The MAX1733EUK+T employs a proprietary current-limited control scheme with fixed minimum on-time (0.25–0.55µs) and off-time (0.25–0.55µs), enabling fast transient response and stable light-load efficiency. Its architecture integrates a high-side MOSFET (RONP ≤ 1.1Ω at VIN = 5.5V) and synchronous rectifier (RONN ≤ 1.6Ω), eliminating external Schottky diodes.
Feedback regulation is implemented via the FB pin referenced to a 1.25V internal threshold (VFB = 1.210–1.280V), with FB leakage current ≤ 0.2µA. Shutdown mode disables all switching circuitry and places LX in high-impedance state, reducing supply current to 0.01µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 250mA guaranteed - supports moderate-power digital ICs without thermal derating in SOT23. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li+, NiMH, and 3.3V/5V rail inputs. |
| Output Voltage | Adjustable 1.25V–2.0V via external resistor divider - enables precise core voltage tuning for ASICs/FPGAs. |
| Quiescent Current | 40µA typical - extends battery life in always-on portable devices. |
| Switching Frequency | Up to 1.2MHz - allows use of small 10µH inductors and 2.2µF ceramic input capacitors. |
| Feedback Threshold | 1.25V ±1.5% - ensures tight output regulation across load and temperature. |
| Shutdown Current | 0.01µA - enables ultra-low-power sleep modes in handheld equipment. |
Pinout & Package
MAX1733EUK+T is housed in a 5-pin SOT23-5 surface-mount package (JEDEC MO-178AA), optimized for minimal PCB footprint and thermal performance in thin-profile portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN | Supply voltage input | Accepts 2.7V–5.5V; requires local 2.2µF ceramic bypass to GND for stability. |
| 2: GND | Power ground reference | Star-ground connection point for input/output capacitors and inductor to minimize noise coupling. |
| 3: SHDN | Active-low shutdown control | Pull to GND for 0.01µA shutdown; tie to IN for normal operation. |
| 4: FB | Voltage feedback input | Connects to resistor divider; regulates output by holding FB at 1.25V nominal. |
| 5: LX | Switch node | Drives external 10µH inductor; high dv/dt node requiring short, shielded routing away from FB. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, improving efficiency >90% and reducing BOM count and board area. |
| Digital soft-start | Gradually ramps current limit in 25% steps to suppress inrush current and reduce input capacitor stress. |
| High-side + low-side MOSFETs | Integrated 300–565mA high-side and 200–430mA low-side current limits enable robust overload protection. |
| Low-noise FB sensing | FB leakage ≤ 0.2µA and tight 1.25V threshold ensure accurate regulation even with high-resistor-divider networks. |
| Thermal-enhanced SOT23 | 571mW power dissipation at +70°C with 7.1mW/°C derating - supports continuous 250mA operation in ambient ≤ +60°C. |
Applications
| Handheld Communication Devices | Portable Computing Systems |
|---|---|
Use Scenario: Powering baseband processors and RF transceivers in cellular/PCS handsets operating from single Li+ cells (2.7V–4.2V). IC Role / Device Role / Timing Role: Primary step-down regulator generating 1.5V or 1.8V core voltage with fast load-transient response to handle burst-mode transmission. Use Value: 40µA quiescent current extends standby time; 1.2MHz switching minimizes EMI near sensitive RF sections. |
Use Scenario: Supplying configurable I/O or memory interface voltages in PDAs and palmtops using alkaline or rechargeable batteries. IC Role / Device Role / Timing Role: Adjustable-output DC-DC converter enabling dynamic voltage scaling for power-aware firmware execution. Use Value: 1.25V–2.0V range matches common low-voltage logic families; ±1.5% accuracy ensures reliable signal integrity at 250mA loads. |
| Battery-Powered Medical Sensors | Industrial Handheld Terminals |
Use Scenario: Providing stable 1.8V bias to low-power ADCs and wireless transceivers in wearable health monitors. IC Role / Device Role / Timing Role: High-efficiency power stage supporting multi-day battery life while maintaining <30mVp-p output ripple. Use Value: Internal soft-start prevents brownout during cold-start from depleted batteries; shutdown mode enables µA-level system sleep. |
Use Scenario: Regulating processor core voltage in ruggedized barcode scanners and data collection terminals powered by NiMH packs. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC solution meeting extended temperature (-40°C to +85°C) requirements. Use Value: SOT23-5 package withstands mechanical shock; 2.7V startup enables operation down to nearly exhausted battery states. |
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 |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.8V output only; 2.05V–6.0V input; 300mA rating; 3.6MHz switching frequency. | Lacks adjustable output; higher frequency demands tighter layout but enables smaller passives. | Select when fixed 1.8V is sufficient and board space permits aggressive high-frequency design. |
| AP3012KTR-G1 | Adjustable 1.25V–5.0V output; 300mA rating; 1.5MHz max frequency; no integrated soft-start. | Requires external soft-start circuitry; wider VOUT range trades off precision for flexibility. | Choose when broader output range is needed and system-level soft-start can be implemented externally. |
Compared with TPS62231DRYR and AP3012KTR-G1, the MAX1733EUK+T offers unique combination of adjustable low-VOUT (1.25V), ultra-low 40µA quiescent current, and integrated digital soft-start - making it optimal for Li+-powered portable devices where battery life, startup reliability, and compactness are critical.
Availability
MAX1733EUK+T is available at Aetrix Electronics and suitable for handheld communication devices, portable computing systems, battery-powered medical sensors, and industrial handheld terminals requiring stable component supply and long-term manufacturability.
Supply support for MAX1733EUK+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 markets.
The MAX1733EUK+T belongs to Maxim's low-voltage, high-efficiency DC-DC converter product line, designed specifically for space- and power-constrained portable electronics requiring regulated sub-2V outputs from single-cell batteries.
FAQ
What is the maximum output current supported by the MAX1733EUK+T?
The MAX1733EUK+T guarantees 250mA output current across its full operating temperature range (-40°C to +85°C) and input voltage range (2.7V to 5.5V). This rating assumes proper thermal management using the 5-pin SOT23 package and recommended external components including a 10µH inductor and 22µF output capacitor. The device maintains regulation under this load with typical efficiency exceeding 90%.
How does the MAX1733EUK+T achieve its 40µA quiescent current?
The MAX1733EUK+T achieves 40µA quiescent supply current through a proprietary current-limited control architecture that disables switching activity when the output is in regulation under light loads. Its BiCMOS process and optimized bias circuitry minimize static current draw, and internal circuit blocks-including error amplifier, reference, and logic-remain active but operate at minimal current. This enables multi-day battery life in always-on portable applications.
Can the MAX1733EUK+T be used with ceramic output capacitors?
Yes, the MAX1733EUK+T supports ceramic output capacitors when configured per Figure 3 in the datasheet, which routes feedback from the LX pin instead of the OUT/FB node. This compensates for phase lag introduced by low-ESR ceramics, enabling stable operation with 2.2µF–4.7µF X7R/X5R types. Standard configurations require tantalum capacitors (22µF, 200–300mΩ ESR) for loop stability.
What is the purpose of the SHDN pin on the MAX1733EUK+T?
SHDN is an active-low shutdown control input on the MAX1733EUK+T. When pulled to GND, it disables the internal oscillator, high-side and low-side MOSFETs, and synchronous rectifier, placing the LX pin in high-impedance state and reducing total supply current to just 0.01µA. For normal operation, SHDN must be tied to the IN pin. This feature enables system-level power gating in battery-operated devices.
What is the FB pin voltage threshold and how is output voltage set on the MAX1733EUK+T?
The FB pin on the MAX1733EUK+T has a precise 1.25V internal reference threshold (1.210V to 1.280V over temperature), and output voltage is set using an external resistor divider between VOUT and GND. With R2 ≤ 50kΩ, the formula is VOUT = 1.25V × (1 + R1/R2). This configuration allows adjustment from 1.25V to 2.0V and provides ±1.5% initial accuracy at zero load.
MAX1733EUK+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:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 2V
- 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
MAX1733EUK+T FAQ
1.How can I place an order for MAX1733EUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1733EUK+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 MAX1733EUK+T reliable?
The price and inventory of MAX1733EUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1733EUK+T is usually 5 days.
3.What payment methods are accepted for MAX1733EUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1733EUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1733EUK+T?
MAX1733EUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1733EUK+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 MAX1733EUK+T?
For technical support, including MAX1733EUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1733EUK+T requirements.
6.How does Aetrix verify that MAX1733EUK+T is sourced from the original manufacturer or authorized distributors?
All MAX1733EUK+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 MAX1733EUK+T meets industry standards.
7.What is the process for return or replacement of MAX1733EUK+T?
All MAX1733EUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1733EUK+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 MAX1733EUK+T part is unused and in its original packaging.
Return procedure for MAX1733EUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1733EUK+T Tags
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