My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1734EUK18+TG104
- Part No.:
- MAX1734EUK18+TG104
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX1734EUK18+TG104.pdf
- Description:
- IC REG BUCK 1.8V 250MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,401
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX1734EUK18+TG104 from Maxim Integrated is a fixed-output 1.8V, 250mA synchronous step-down DC-DC converter in a 5-pin SOT23 package, featuring 40µA quiescent current, 1.2MHz max switching frequency, and internal soft-start-designed for space-constrained battery-powered systems such as cellular handsets and PDAs.
For engineers reviewing the MAX1734EUK18+TG104 datasheet, MAX1734EUK18+TG104 pinout, MAX1734EUK18+TG104 application, or MAX1734EUK18+TG104 equivalent, key selection criteria include guaranteed 250mA output at 1.8V, ±3% output accuracy over load/temperature, shutdown current of 0.01µA, and compatibility with low-ESR tantalum or ceramic output capacitors.
Technical Context
The MAX1734EUK18+TG104 employs a proprietary current-limited control scheme with fixed 1.8V output derived from an internal resistor divider (no external FB network), enabling fast transient response and stable operation across 2.7V–5.5V input. Its high-side and low-side MOSFETs feature on-resistances of 1.1Ω (high-side) and 1.6Ω (low-side) at 5.5V VIN.
It integrates digital soft-start that ramps current limit in 25% steps to limit inrush, and enters high-impedance shutdown when SHDN is pulled low-reducing supply current to 0.01µA while disabling LX, synchronous rectifier, and control logic. Minimum on/off times are 0.25–0.55µs, supporting efficient light-load operation without frequency foldback.
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 replacement of LDOs in core logic rails. |
| Input Voltage Range | 2.7V to 5.5V-supports single-cell Li+ (2.7–4.2V), alkaline, or regulated 3.3V/5V supplies without external pre-regulation. |
| Quiescent Current | 40µA typical-minimizes standby power loss in always-on portable devices like cordless phones. |
| Shutdown Current | 0.01µA-extends battery life during deep sleep modes in handheld terminals. |
| Switching Frequency | Up to 1.2MHz-permits use of compact 10µH inductors and 2.2µF ceramic input capacitors. |
| Output Current | 250mA guaranteed-sufficient for powering DSP cores, RF front-ends, or microcontroller I/O banks. |
| Efficiency | >90% at 200mA with 3.6V input-achieved via internal synchronous rectification, eliminating Schottky diode losses. |
Pinout & Package
Package: 5-pin SOT23-5 (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, Pb-free plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power Input | Accepts 2.7V–5.5V; requires local 2.2µF ceramic bypass to GND for EMI suppression and transient response. |
| 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 low to disable converter and reduce IIN to 0.01µA; tie to IN for continuous operation. |
| 4 OUT | Output Sense | Internal connection to fixed 1.8V divider; no external feedback components required-simplifies layout and BOM. |
| 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 conduction loss and thermal footprint-critical for sealed handheld enclosures. |
| Digital Soft-Start | Ramps current limit in four 25% steps at startup, limiting inrush into 22µF output capacitor and preventing input rail sag. |
| High-Frequency Operation | 1.2MHz max switching enables small passive components: 10µH inductor and 2.2µF/22µF input/output caps fit within <15mm² PCB area. |
| Low Quiescent Current | 40µA supply current at no load extends runtime in intermittent-use devices like remote controls or sensors. |
| Robust Protection | Includes UVLO (1.55–1.65V hysteresis), current limiting (300–565mA high-side), and thermal shutdown-ensures reliability under brownout or overload. |
Applications
| Cellular Handset Core Rail | PDA Processor Supply |
|---|---|
|
Use Scenario: Powers baseband processor core at 1.8V 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 1.8V/250mA with fast load transient response to handle burst-mode TX/RX current demands. Use Value: 90%+ efficiency at 200mA reduces heat generation in thermally constrained clamshell form factors. |
Use Scenario: Supplies 1.8V to ARM-based PDA application processors during active UI navigation and background sync. IC Role / Device Role / Timing Role: High-efficiency buck converter with 0.01µA shutdown mode enabling multi-week standby on 1000mAh battery. Use Value: Internal soft-start prevents input voltage droop during cold boot, avoiding reset glitches in memory subsystems. |
| Cordless Phone Baseband | Handheld Terminal I/O Rail |
|
Use Scenario: Generates 1.8V for DECT cordless phone baseband ICs powered by 3×AA alkaline (4.5V nominal). IC Role / Device Role / Timing Role: Fixed-output DC-DC converter maintaining regulation down to 2.7V input-extending usable battery life beyond LDO limits. Use Value: 40µA quiescent current minimizes drain during idle listening mode, doubling talk-time vs. linear regulators. |
Use Scenario: Provides 1.8V I/O supply for industrial handheld terminals with RS-232/USB interfaces and LCD backlight drivers. IC Role / Device Role / Timing Role: Compact SOT23-5 regulator supporting dynamic load steps from 1mA (sleep) to 250mA (data transmission). Use Value: Synchronous rectification and 1.2MHz switching ensure low output ripple (<30mVp-p) without compromising EMI compliance. |
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 |
|---|---|---|---|
| TPS62231DRYR | 1.8V fixed, 300mA, 2.05–6.0V input, 25µA IQ, 3.6MHz switching-smaller solution size but higher EMI risk. | Requires 0402/0603 passives; less tolerant of high-ESR output caps than MAX1734EUK18+TG104. | Prefer for ultra-compact designs where board area is more critical than conducted EMI filtering effort. |
| AP63202WU-7 | 1.8V fixed, 2A, 4.5–18V input, 350µA IQ, 500kHz–2.5MHz adjustable-higher current, wider VIN, but larger SOT23-6 package. | Over-specified for 250mA loads; requires additional input filtering due to higher peak currents. | Choose only if future design scaling to >500mA or 12V input is anticipated-adds cost and complexity for current needs. |
Compared with TPS62231DRYR and AP63202WU-7, the MAX1734EUK18+TG104 delivers optimal balance of ultra-low IQ (40µA), proven 1.2MHz stability with low-ESR tantalum/ceramic outputs, and minimal BOM count-making it ideal for cost-sensitive, battery-life-critical 250mA applications where layout simplicity and EMI robustness are prioritized over raw current headroom or smallest footprint.
Availability
MAX1734EUK18+TG104 is available at Aetrix Electronics and suitable for cellular handsets, PDAs, and cordless telephones requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MAX1734EUK18+TG104 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 ICs for industrial, communications, and consumer applications.
The MAX1734EUK18+TG104 belongs to Maxim's low-voltage DC-DC converter product line, engineered specifically for battery-powered portable electronics demanding high efficiency, minimal quiescent current, and ultra-compact packaging.
FAQ
What is the output voltage tolerance of the MAX1734EUK18+TG104 over temperature and load?
The MAX1734EUK18+TG104 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 Maxim's production test flow and reflects worst-case deviation from nominal 1.8V under combined thermal and loading stress-not just room-temperature initial calibration. The MAX1734EUK18+TG104 achieves this using a factory-trimmed internal resistor divider, eliminating external component drift effects.
Can the MAX1734EUK18+TG104 operate from a single alkaline cell?
Yes-the MAX1734EUK18+TG104 supports input voltages from 2.7V to 5.5V, making it compatible with fresh single alkaline cells (up to ~1.6V) in series configurations (e.g., two cells = 3.2V min). Its UVLO threshold of 1.55–1.65V ensures reliable startup and graceful shutdown as the battery discharges below 2.7V. The MAX1734EUK18+TG104 maintains regulation down to 2.7V input while delivering full 250mA at 1.8V, extending usable battery capacity beyond linear regulator alternatives.
Does the MAX1734EUK18+TG104 require external feedback resistors?
No-the MAX1734EUK18+TG104 features a factory-preset 1.8V output implemented via an internal precision resistor divider connected to the OUT pin. Unlike the adjustable MAX1733, it does not use the FB pin and requires no external resistors, reducing BOM count, layout area, and potential errors from resistor tolerance or placement. This fixed architecture simplifies design validation and improves long-term output stability by removing external component drift variables from the regulation loop.
What is the minimum recommended output capacitor for the MAX1734EUK18+TG104?
Maxim specifies a minimum 22µF tantalum output capacitor (with 200–300mΩ ESR) for stable operation of the MAX1734EUK18+TG104. Ceramic capacitors may be used with modified compensation (e.g., LX-sensing topology per Figure 3 in the datasheet), but standard configuration requires the ESR-dependent damping provided by tantalum. Using less than 22µF or excessively low-ESR ceramics without compensation risks subharmonic oscillation or poor transient response-verified in Maxim's typical operating characteristics plots for the MAX1734EUK18+TG104.
How does the MAX1734EUK18+TG104 achieve 90%+ efficiency without an external Schottky diode?
The MAX1734EUK18+TG104 achieves >90% efficiency through integrated synchronous rectification: its internal low-side MOSFET replaces the external Schottky diode found in conventional buck converters. With RONN ≤1.6Ω at 5.5V input, conduction losses are significantly lower than typical 0.3V Schottky forward drop-especially at 250mA load. This architecture eliminates reverse recovery losses and enables continuous conduction mode operation across the full load range, directly contributing to the MAX1734EUK18+TG104's high efficiency claim under real-world conditions.
MAX1734EUK18+TG104 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):
- 1.8V
- 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+TG104 FAQ
1.How can I place an order for MAX1734EUK18+TG104 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1734EUK18+TG104 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+TG104 reliable?
The price and inventory of MAX1734EUK18+TG104 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1734EUK18+TG104 is usually 5 days.
3.What payment methods are accepted for MAX1734EUK18+TG104?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1734EUK18+TG104 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1734EUK18+TG104?
MAX1734EUK18+TG104 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1734EUK18+TG104 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+TG104?
For technical support, including MAX1734EUK18+TG104 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1734EUK18+TG104 requirements.
6.How does Aetrix verify that MAX1734EUK18+TG104 is sourced from the original manufacturer or authorized distributors?
All MAX1734EUK18+TG104 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+TG104 meets industry standards.
7.What is the process for return or replacement of MAX1734EUK18+TG104?
All MAX1734EUK18+TG104 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1734EUK18+TG104, 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+TG104 part is unused and in its original packaging.
Return procedure for MAX1734EUK18+TG104:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1734EUK18+TG104 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
