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Analog Devices Inc./Maxim Integrated MAX1734EUK18+T
- Part No.:
- MAX1734EUK18+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX1734EUK18+T.pdf
- Description:
- IC REG BUCK 1.8V 250MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,532
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Product details
Overview
MAX1734EUK18+T from Maxim Integrated is a fixed-output, synchronous step-down DC-DC converter delivering 250mA at 1.8V from a 2.7V–5.5V input. It uses proprietary current-limited control with internal synchronous rectification, achieves >90% efficiency at 1.2MHz max switching frequency, and maintains only 40µA quiescent current-ideal for Li+-powered handheld devices requiring compact, high-efficiency regulation.
For engineers reviewing the MAX1734EUK18+T datasheet, MAX1734EUK18+T pinout, MAX1734EUK18+T application, or MAX1734EUK18+T equivalent, key selection criteria include guaranteed 250mA output, ±3% output accuracy over load/temperature, 0.01µA shutdown current, SOT23-5 footprint compatibility, and absence of external diode requirement due to integrated synchronous rectifier.
Technical Context
The MAX1734EUK18+T implements a proprietary current-limited control architecture with fixed 1.8V output derived from an internal resistor divider connected to the OUT pin. It features digital soft-start that ramps current limit in 25% steps, minimizing inrush and reducing input capacitor requirements.
Its control loop operates with minimum on-time and off-time of 0.25–0.55µs, enabling stable light-load operation without pulse-skipping, while maintaining near-constant frequency under medium-to-heavy loads. The LX pin drives an integrated high-side MOSFET (RONP ≤ 1.1Ω) and low-side synchronous rectifier (RONN ≤ 1.6Ω), eliminating external diode losses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% over 0–250mA load and -40°C to +85°C - enables direct powering of 1.8V core logic without external feedback components. |
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li+, NiMH, or 3.3V/5V system rails without pre-regulation. |
| Max Output Current | 250mA guaranteed - sufficient for baseband processors, RF ICs, or sensor subsystems in portable electronics. |
| Quiescent Current | 40µA typical - extends battery life in always-on standby modes (e.g., Bluetooth LE receivers). |
| Shutdown Current | 0.01µA - reduces system leakage to negligible levels during deep sleep states. |
| Switching Frequency | Up to 1.2MHz - allows use of 10µH inductors and 2.2µF ceramic input capacitors, minimizing PCB area. |
| Efficiency | >90% at 250mA with VIN = 3.6V - exceeds linear regulator performance while avoiding thermal derating issues. |
Pinout & Package
MAX1734EUK18+T is housed in a space-saving 5-pin SOT23-5 package (JEDEC MO-178AA), with 1.3mm pitch and 2.9mm × 1.6mm footprint. Thermal pad is not present; power dissipation is managed via PCB copper area under the exposed drain tab (Pin 5, LX).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Power Input | Accepts 2.7V–5.5V supply; requires local 2.2µF ceramic bypass to GND for EMI suppression and transient response. |
| 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 | Pulled high to IN for operation; driven low to enter 0.01µA shutdown - no external pull-up needed. |
| 4 - OUT | Fixed-Voltage Sense | Internally connected to 1.8V divider; no external resistors required - distinguishes MAX1734 from adjustable MAX1733. |
| 5 - LX | Switch Node | Drives external 10µH inductor; high dv/dt node - must be routed short and away from FB/OUT traces to avoid coupling noise. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Eliminates external Schottky diode, reducing BOM count and thermal loss - improves efficiency by ≥12% vs. asynchronous designs at 100mA. |
| Digital Soft-Start | Gradually increases current limit in 25% steps at startup - limits peak inrush to <150mA and avoids input rail collapse on weak batteries. |
| High-Side MOSFET RON | ≤1.1Ω at VIN = 5.5V - minimizes conduction loss at full load, supporting 250mA with <280mW junction rise. |
| UVLO with Hysteresis | 1.6V threshold with 200mV hysteresis - prevents oscillation during brownout and ensures clean restart after low-voltage events. |
| Light-Load Efficiency Optimization | Maintains >85% efficiency down to 1mA load - achieved via adaptive minimum on-time control, not pulse-skipping. |
Applications
| Cellular Handset Power Rail | Bluetooth Audio SoC Supply |
|---|---|
|
Use Scenario: Powers 1.8V I/O and memory interface in GSM/UMTS handset baseband processors during active call mode. IC Role / Device Role / Timing Role: Primary buck regulator supplying regulated 1.8V from single-cell Li+ (2.7V–4.2V). Use Value: Delivers 250mA with <30mVp-p ripple and 40µA quiescent current - extends talk time by 18% vs. LDO alternatives. |
Use Scenario: Supplies clean 1.8V to Bluetooth 5.0 audio SoC (e.g., CSR8675) in wireless earbuds with tight thermal constraints. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter replacing discrete FET+diode buck stage. Use Value: Enables 100% duty-cycle operation at low VIN (2.7V) with >87% efficiency - avoids thermal throttling in sealed enclosures. |
| PDA Application Processor Core | Industrial Sensor Node MCU |
|
Use Scenario: Provides 1.8V core voltage to ARM9-based PDA application processor during burst-mode data processing. IC Role / Device Role / Timing Role: Fast-transient buck regulator supporting dynamic voltage scaling between 10mA idle and 250mA peak loads. Use Value: Load-transient response settles within 4µs (±20mV), preventing processor reset during clock domain transitions. |
Use Scenario: Powers ultra-low-power 32-bit MCU (e.g., MSP432P401R) and analog front-end in battery-operated environmental sensor nodes. IC Role / Device Role / Timing Role: Always-on power supply with 0.01µA shutdown current enabling 10-year battery life in sleep mode. Use Value: Maintains ±3% output accuracy across -40°C to +85°C - ensures ADC reference stability without calibration drift. |
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 | 1.8V fixed, 300mA, 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-tolerant systems or legacy 5V supply rails. | Prefer when board space is constrained and input never exceeds 6.5V; verify UVLO (2.05V) matches battery cutoff. |
| Analog Devices ADP2301ARMZ-1.8-R7 | 1.8V fixed, 600mA, 3.0V–20V input, 1.8mA IQ, 700kHz switching - higher current, wider VIN, but 45× higher quiescent current. | Better for industrial 12V inputs; unsuitable for coin-cell or Li+ standby applications due to 1.8mA shutdown draw. | Choose only if >250mA headroom or >5.5V input is required; otherwise MAX1734EUK18+T offers superior battery runtime. |
Compared with TPS62231DRYR and ADP2301ARMZ-1.8-R7, the MAX1734EUK18+T uniquely balances ultra-low IQ (40µA), 5.5V input tolerance, and SOT23-5 footprint - making it optimal for space- and battery-constrained 1.8V portable designs where 250mA suffices.
Availability
MAX1734EUK18+T is available at Aetrix Electronics and suitable for cellular handsets, Bluetooth audio devices, PDAs, and industrial sensor nodes requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX1734EUK18+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 portable, industrial, and communications applications.
The MAX1733/MAX1734 family was designed specifically for battery-powered handheld equipment needing compact, high-efficiency DC-DC conversion with minimal external components - targeting cellular phones, PDAs, and cordless telephones in the early 2000s.
FAQ
What is the output voltage tolerance of the MAX1734EUK18+T over temperature and load?
The MAX1734EUK18+T guarantees ±3% output voltage accuracy across the full operating range: -40°C to +85°C ambient temperature and 0–250mA load current. This specification is verified per Maxim's production test flow and includes initial trim, line regulation, and load regulation contributions - ensuring reliable 1.8V supply for 1.8V logic interfaces without external trimming.
Does the MAX1734EUK18+T require external feedback resistors?
No, the MAX1734EUK18+T does not require external feedback resistors. Its 1.8V output is factory-preset using an internal resistor divider connected to the OUT pin (Pin 4). This eliminates component count and layout sensitivity associated with external FB networks - unlike the adjustable MAX1733, which requires external R1/R2 on the FB pin.
Can the MAX1734EUK18+T operate from a 2.7V input and still deliver 250mA at 1.8V?
Yes, the MAX1734EUK18+T is fully specified to deliver 250mA at 1.8V output with a 2.7V input. Its proprietary current-limited control and low RON MOSFETs enable >85% efficiency at this condition, and the 1.85V startup voltage (VSTART) ensures reliable turn-on even as Li+ cells discharge to 2.7V nominal.
What is the purpose of the LX pin on the MAX1734EUK18+T, and how should it be routed?
The LX pin (Pin 5) is the switch-node connection to the external inductor. It carries high dv/dt switching current and must be routed as short and wide as possible - ideally directly to the inductor pad with no vias. Keep LX traces >5mm away from sensitive nodes (IN, OUT, GND) and avoid running parallel to FB traces to prevent coupling-induced regulation error in the MAX1734EUK18+T.
How does the MAX1734EUK18+T achieve its 0.01µA shutdown current?
The MAX1734EUK18+T achieves 0.01µA shutdown current by fully disabling its internal oscillator, gate drivers, error amplifier, and bias circuits when SHDN (Pin 3) is pulled low. In this state, only a nanoamp-level leakage path remains - verified across temperature and process corners - enabling multi-year battery life in always-off sensor nodes powered by the MAX1734EUK18+T.
MAX1734EUK18+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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- 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
MAX1734EUK18+T FAQ
1.How can I place an order for MAX1734EUK18+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1734EUK18+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 MAX1734EUK18+T reliable?
The price and inventory of MAX1734EUK18+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1734EUK18+T is usually 5 days.
3.What payment methods are accepted for MAX1734EUK18+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1734EUK18+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1734EUK18+T?
MAX1734EUK18+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1734EUK18+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 MAX1734EUK18+T?
For technical support, including MAX1734EUK18+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1734EUK18+T requirements.
6.How does Aetrix verify that MAX1734EUK18+T is sourced from the original manufacturer or authorized distributors?
All MAX1734EUK18+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 MAX1734EUK18+T meets industry standards.
7.What is the process for return or replacement of MAX1734EUK18+T?
All MAX1734EUK18+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1734EUK18+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 MAX1734EUK18+T part is unused and in its original packaging.
Return procedure for MAX1734EUK18+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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