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Analog Devices Inc./Maxim Integrated MAX1735EUK25
- Part No.:
- MAX1735EUK25
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX1735EUK25.pdf
- Description:
- IC REG LIN NEG ADJ 200MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,668
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Product details
Overview
MAX1735EUK25 from Maxim Integrated is a negative-output, low-dropout linear regulator delivering a guaranteed -2.5V output at up to 200mA with 80mV dropout at full load, ±1% output voltage accuracy, and 85µA quiescent current - designed for GaAsFET bias, mobile wireless data modems, and portable instrumentation requiring stable negative rail generation.
For engineers reviewing the MAX1735EUK25 datasheet, MAX1735EUK25 pinout, MAX1735EUK25 application, or MAX1735EUK25 equivalent, key selection criteria include preset -2.5V output, SOT23-5 package thermal performance, shutdown threshold compatibility with TTL/CMOS logic, stability with 1µF ceramic output capacitor, and PSRR >60dB at 100Hz for noise-sensitive analog circuits.
Technical Context
The MAX1735EUK25 uses an internal N-channel MOSFET pass element with -1.25V precision reference and Dual Mode™ feedback architecture, enabling either fixed -2.5V output (SET tied to GND) or adjustable operation (-1.25V to -5.5V) via external resistor divider. Its error amplifier compares SET voltage against the -1.25V reference to regulate OUT.
Shutdown control accepts bipolar logic: device enables when |VSHDN| > 1.6V (positive or negative), disables below |0.4V|, drawing <1nA in shutdown. Thermal protection activates at +160°C junction temperature with 15°C hysteresis, cycling output during sustained overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset -2.5V (±1% accuracy over -40°C to +85°C); no external resistors required for fixed mode |
| Max Output Current | Guaranteed -200mA continuous output under specified thermal conditions |
| Dropout Voltage | 80mV at -200mA load - enables operation down to VIN = -2.58V for -2.5V output |
| Quiescent Current | 85µA typical at no load; increases to 125µA at -200mA - optimized for battery runtime |
| PSRR | >60dB at 100Hz - suppresses input ripple in analog signal chains and RF bias rails |
| Shutdown Current | <1nA at VSHDN = 0V - preserves battery charge during system sleep modes |
| Stability | Stable with ≥1µF ceramic COUT (ESR ≤0.2Ω) - eliminates need for tantalum or electrolytic capacitors |
Pinout & Package
MAX1735EUK25 is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), with exposed pad not electrically connected. The IN pin serves as thermal path; soldering to large copper area improves θJA by up to 30%.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference and thermal sink | Common return for all internal circuitry; must connect to low-impedance ground plane for stability and thermal performance |
| IN (Pin 2) | Negative input supply | Accepts -2.5V to -6.5V; requires 1µF ceramic bypass to GND; also functions as primary thermal conduction path |
| SHDN (Pin 3) | Bipolar enable/disable control | Drives to GND for shutdown (<1nA IQ); >+1.6V or <-1.6V enables regulation - compatible with 3.3V/5V logic without level shift |
| SET (Pin 4) | Dual Mode™ feedback node | Tied to GND for -2.5V fixed output; connects to external resistor divider for adjustable mode (VSET = -1.25V reference) |
| OUT (Pin 5) | Regulated negative output | Delivers up to -200mA; requires 1µF ceramic capacitor to GND; ESR ≤0.2Ω ensures stability across full operating range |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Feedback | Single pin (SET) selects between factory-trimmed -2.5V output or user-adjustable range (-1.25V to -5.5V) - reduces BOM count and design complexity |
| N-Channel MOSFET Pass | Eliminates base-drive current loss; maintains 85µA quiescent current even at full load and near dropout - extends battery life in portable systems |
| Bipolar Shutdown Logic | Accepts either positive or negative enable signals (|VSHDN| > 1.6V) - simplifies interface with mixed-voltage microcontrollers and analog controllers |
| Thermal Cycling Protection | +160°C trip point with 15°C hysteresis - prevents permanent damage during sustained short-circuit while maintaining functional safety |
| Low-ESR Stability | Guaranteed stable with 1µF ceramic COUT (ESR ≤0.2Ω) - avoids costly tantalum capacitors and enables compact PCB layouts |
Applications
| GaAsFET Bias Supply | Mobile Wireless Data Modem |
|---|---|
Use Scenario: Providing clean, low-noise negative gate bias for GaAs FET power amplifiers in cellular base station front-ends and satellite transceivers. IC Role / Device Role / Timing Role: Negative LDO regulator generating precise -2.5V bias rail independent of varying battery or DC-DC converter output. Use Value: PSRR >60dB at 100Hz and 160µVRMS output noise prevent AM-to-PM distortion and adjacent channel leakage in RF power stages. | Use Scenario: Powering analog front-end circuitry (mixers, IF amplifiers, ADC drivers) in handheld LTE/WiMAX modems operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Low-quiescent-current negative rail generator supporting deep-sleep modes and fast wake-up response. Use Value: 85µA IQ and <1nA shutdown current extend standby time; 80mV dropout allows usable battery life down to 2.6V cell voltage. |
| Portable Instrumentation Amplifier | Notebook Computer Subsystem |
Use Scenario: Supplying dual-rail op-amps and precision ADC references in handheld multimeters, oscilloscope probes, and portable spectrum analyzers. IC Role / Device Role / Timing Role: Stable -2.5V reference rail for signal conditioning stages requiring high PSRR and low drift over temperature. Use Value: ±1% output accuracy over -40°C to +85°C and <0.004%/mA load regulation ensure measurement repeatability across operating conditions. | Use Scenario: Generating auxiliary negative bias for display backlight drivers, USB PHY termination, and audio codec analog sections in ultra-thin notebooks. IC Role / Device Role / Timing Role: Compact SOT23-5 negative LDO integrated into space-constrained motherboard power tree. Use Value: Tiny footprint and thermal performance with standard PCB copper pour enable placement near noise-sensitive analog ICs without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1963AES5-2.5#TRPBF | Positive-output LDO (2.5V); no negative capability; higher IQ (1.1mA); 350mV dropout at 1.5A | Cannot replace MAX1735EUK25 in negative-rail applications; suitable only where system architecture permits positive bias redesign | Select only if redesigning entire bias network to positive domain and requiring >1A output |
| TPS72325DBVR | Positive-output LDO (2.5V); 250mA rating; 150mV dropout; 250µA IQ; no shutdown | Lacks bipolar shutdown, negative output, and low-IQ - incompatible with battery-powered negative-rail use cases | Not recommended as direct alternative; consider only for non-portable, positive-rail-only systems with relaxed quiescent current requirements |
Compared with LT1963AES5-2.5#TRPBF and TPS72325DBVR, the MAX1735EUK25 uniquely delivers verified -2.5V output, sub-100µA quiescent current, and bipolar shutdown in SOT23-5 - making it the only viable option for space- and power-constrained negative-bias applications without architectural changes.
Availability
MAX1735EUK25 is available at Aetrix Electronics and suitable for GaAsFET bias, mobile wireless data modems, and portable instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and medical-grade designs.
Supply support for MAX1735EUK25 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 MAX1735 series belongs to Maxim's precision negative LDO regulator product line, engineered specifically for battery-powered portable equipment requiring ultra-low quiescent current, bipolar logic compatibility, and robust thermal protection in miniature packages.
FAQ
What is the exact output voltage tolerance of the MAX1735EUK25 over temperature?
The MAX1735EUK25 guarantees ±2% output voltage accuracy over the full -40°C to +85°C operating temperature range, with ±1% typical at +25°C. This is confirmed in the Electrical Characteristics table under "Output Voltage Accuracy" for ILOAD = -100µA to -200mA, where min/max limits are -3% and +2% respectively.
Can the MAX1735EUK25 be used with a 1µF output capacitor for all output voltages?
Yes - the MAX1735EUK25 is stable with a 1µF ceramic output capacitor for its preset -2.5V output. The datasheet explicitly states "Stable with 1µF COUT" and specifies ESR ≤0.2Ω for outputs between -2.5V and -5.5V, which applies directly to the MAX1735EUK25.
Does the MAX1735EUK25 require an input capacitor, and what value is recommended?
Yes - a 1µF ceramic capacitor is required between IN and GND per the Typical Operating Circuit and Applications Information section. It lowers source impedance during transients; smaller values may be used only when powered from a low-impedance source like another regulator or fresh battery.
What is the maximum allowable input voltage for the MAX1735EUK25?
The absolute maximum input voltage for the MAX1735EUK25 is -7.0V relative to GND, as stated in the Absolute Maximum Ratings table. However, the recommended operating range is -2.5V to -6.5V per the General Description - exceeding -6.5V risks violating safe operating area limits under load.
How does the shutdown function behave when driven by a negative voltage?
When driven by a negative voltage, the MAX1735EUK25 enters shutdown if |VSHDN| < 0.4V (e.g., -0.3V), and enables regulation if |VSHDN| > 1.6V (e.g., -2.0V). This bipolar behavior is documented in Note 3 of the Electrical Characteristics table and Pin Description for SHDN.
MAX1735EUK25 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Negative
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -6.5V
- Voltage - Output (Min/Fixed):
- -1.25V (-2.5V)
- Voltage - Output (Max):
- -5.5V
- Voltage Dropout (Max):
- 0.24V @ 200mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 85 µA
- Current - Supply (Max):
- 125 µA
- PSRR:
- 60dB (100Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX1735EUK25 FAQ
1.How can I place an order for MAX1735EUK25 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1735EUK25 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 MAX1735EUK25 reliable?
The price and inventory of MAX1735EUK25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1735EUK25 is usually 5 days.
3.What payment methods are accepted for MAX1735EUK25?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1735EUK25 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1735EUK25?
MAX1735EUK25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1735EUK25 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 MAX1735EUK25?
For technical support, including MAX1735EUK25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1735EUK25 requirements.
6.How does Aetrix verify that MAX1735EUK25 is sourced from the original manufacturer or authorized distributors?
All MAX1735EUK25 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 MAX1735EUK25 meets industry standards.
7.What is the process for return or replacement of MAX1735EUK25?
All MAX1735EUK25 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1735EUK25, 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 MAX1735EUK25 part is unused and in its original packaging.
Return procedure for MAX1735EUK25:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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