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Analog Devices Inc./Maxim Integrated MAX1615EUK-T
- Part No.:
- MAX1615EUK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX1615EUK-T.pdf
- Description:
- IC REG LIN 3.3V/5V 30MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,608
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Product details
Overview
MAX1615EUK-T from Maxim Integrated is a micropower, fixed-output linear regulator in SOT23-5 package, delivering 3.3V or 5V at up to 30mA output current with 4V–28V input range, 8µA max quiescent current, and ±2% initial output accuracy. It powers CMOS RAM and microcontrollers in high-voltage battery systems such as notebook computers and smart-battery packs.
For engineers reviewing the MAX1615EUK-T datasheet, MAX1615EUK-T pinout, MAX1615EUK-T application, or MAX1615EUK-T equivalent, key selection criteria include dropout voltage (350mV @ 30mA), shutdown supply current (<1µA), thermal shutdown at +150°C, and pin-selectable output configuration for low-power always-on subsystems.
Technical Context
The MAX1615EUK-T employs a PNP pass transistor architecture enabling low dropout operation across its wide 4V–28V input range while maintaining ultra-low ground current. Its internal resistor divider and 5/3 pin select logic determine fixed 3.3V or 5V output without external feedback components.
Shutdown is activated by pulling SHDN low, disabling all internal circuitry including reference and bias networks to achieve sub-1µA supply current. Thermal protection triggers at +150°C junction temperature with +20°C hysteresis, causing pulsating output under sustained overload rather than permanent latch-off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 28V - supports direct connection to high-voltage batteries (e.g., 3S Li-ion, 12V lead-acid) without pre-regulation |
| Output Voltage | Pin-selectable 3.3V or 5V - set by connecting 5/3 pin to GND (3.3V) or OUT (5V); no external resistors required |
| Quiescent Supply Current | 8µA (max) - enables multi-year backup runtime for RTC/CMOS RAM in battery-only mode |
| Dropout Voltage | 350mV @ 30mA - ensures regulation down to VIN = VOUT + 0.35V, critical during battery discharge |
| Output Accuracy | ±2% initial tolerance - guarantees stable logic-level supply for microcontrollers and memory interfaces |
| Thermal Shutdown | +150°C with +20°C hysteresis - provides self-recovering fault protection without external supervision |
| Package Power Dissipation | 571mW @ TA = +70°C - enables 30mA continuous output at elevated ambient temperatures with standard PCB layout |
Pinout & Package
SOT23-5 package with exposed pad not electrically connected; compact 2.9mm × 1.6mm footprint optimized for space-constrained portable systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Positive Input Supply | Accepts 4V–28V unregulated input; must be decoupled with ≥0.1µF ceramic capacitor |
| 2 GND | Ground Reference & Thermal Path | Primary ground return and main heat conduction path; requires large copper pour for thermal performance |
| 3 OUT | Regulated Output | Delivers fixed 3.3V or 5V; requires ≥4.7µF output capacitance for full 30mA load stability |
| 4 5/3 | Output Voltage Select | Connect to GND for 3.3V output; connect to OUT for 5V output - defines internal feedback ratio |
| 5 SHDN | Active-Low Shutdown Control | Pull low to reduce supply current to <1µA; tie to IN for automatic power-up on input application |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range Support | Operates from 4V to 28V input - eliminates need for intermediate buck stage in high-voltage battery systems |
| Ultra-Low Quiescent Current | 8µA max supply current - extends battery life in always-on keep-alive applications beyond 5 years |
| Pin-Selectable Output | No external resistors needed - simplifies BOM and layout for dual-voltage system variants |
| Integrated Thermal Protection | +150°C shutdown with +20°C hysteresis - prevents damage during sustained overload without external circuitry |
| Low Dropout Architecture | 350mV dropout at 30mA - maintains regulation even as battery voltage drops near end-of-discharge |
Applications
| CMOS/RTC Backup Power | Microcontroller Keep-Alive Supply |
|---|---|
Use Scenario: Maintaining timekeeping and SRAM state during main system power loss in notebooks and PDAs. IC Role / Device Role / Timing Role: Always-on linear regulator providing clean, low-noise 3.3V or 5V to real-time clock and nonvolatile memory. Use Value: 8µA quiescent current enables >10-year coin-cell battery life; ±2% output accuracy ensures reliable logic-level interface. | Use Scenario: Powering microcontroller reset circuitry and brown-out detection during AC adapter switchover. IC Role / Device Role / Timing Role: High-voltage input regulator sustaining MCU core voltage during transient input dips. Use Value: 350mV dropout and fast line-transient response prevent MCU reset during battery-to-adapter transitions. |
| Notebook Computer Auxiliary Rail | Smart-Battery Pack Management |
Use Scenario: Generating dedicated 3.3V rail for embedded controller (EC) and keyboard controller in clamshell laptops. IC Role / Device Role / Timing Role: Low-noise, low-quiescent regulator powering EC firmware and sensor interfaces independent of main CPU rail. Use Value: 50mV load-transient overshoot at 30mA step enables stable EC operation during sudden peripheral wake events. | Use Scenario: Supplying power to fuel-gauge IC and protection circuitry inside lithium-ion battery packs. IC Role / Device Role / Timing Role: Primary regulator converting pack voltage (e.g., 9–12.6V) to 3.3V for analog front-end and SMBus interface. Use Value: 28V absolute maximum input rating accommodates full 4S Li-ion stack transients without clamping or derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-quiescent linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A0533PDBVR | 3.3V fixed, 1.5µA IQ, 24V max input, SOT23-5 - lower quiescent current but narrower input range | Optimized for ultra-low-power IoT sensors; lacks 28V rating for high-voltage battery use | Select when battery voltage stays ≤24V and sub-2µA IQ is mandatory |
| MCP1703T-3302E/MB | 3.3V fixed, 3.5µA IQ, 24V max input, SOT23-5 - higher accuracy (±0.5%) but no 5V option | Better for precision analog subsystems; not pin-compatible due to different shutdown threshold | Choose for high-accuracy 3.3V rails where 5V flexibility is unnecessary |
Compared with TPS7A0533PDBVR and MCP1703T-3302E/MB, the MAX1615EUK-T uniquely supports 28V input and pin-selectable 3.3V/5V outputs in the same SOT23-5 footprint, making it irreplaceable in dual-rail, high-voltage portable designs requiring long-term battery backup.
Availability
MAX1615EUK-T is available at Aetrix Electronics and suitable for notebook computers, smart-battery packs, and microcontroller keep-alive circuits requiring stable component supply across extended product lifecycles.
Supply support for MAX1615EUK-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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, computing, and portable applications.
The MAX1615EUK-T belongs to Maxim's high-voltage linear regulator product line, engineered specifically for battery-backed systems requiring ultra-low IQ, wide input range, and robust thermal protection in miniature packages.
FAQ
What output voltage options does the MAX1615EUK-T support?
The MAX1615EUK-T supports two fixed output voltages: 3.3V and 5V. Selection is made externally via the 5/3 pin - connect it to GND for 3.3V output or to the OUT pin for 5V output. This eliminates the need for external feedback resistors and simplifies design for dual-voltage system variants. The MAX1615EUK-T does not support adjustable output like the MAX1616 family members.
What is the maximum continuous output current of the MAX1615EUK-T?
The MAX1615EUK-T delivers up to 30mA continuous output current under normal operating conditions. Its internal current limit is rated at 100mA typical, allowing safe short-circuit tolerance for up to 30 seconds. Actual deliverable current depends on thermal conditions - at +70°C ambient, the SOT23-5 package supports 571mW dissipation, limiting usable current based on (VIN – VOUT).
How does the MAX1615EUK-T achieve ultra-low quiescent current?
The MAX1615EUK-T achieves 8µA maximum quiescent supply current through optimized PNP pass transistor biasing and minimal internal reference/bias circuitry. In shutdown mode (SHDN = GND), supply current drops below 1µA as the pass transistor, reference, and all control circuitry are fully disabled. This architecture enables multi-year battery life in CMOS RAM and RTC backup applications.
Can the MAX1615EUK-T operate directly from a 3S Li-ion battery pack?
Yes, the MAX1615EUK-T can operate directly from a 3S Li-ion battery pack (nominal 11.1V, max 12.6V). Its 4V–28V input range comfortably covers the full 3S voltage envelope, including charging transients. With 350mV dropout at 30mA, it maintains regulation even as the pack discharges to ~3.65V per cell (10.95V), ensuring uninterrupted power to downstream logic.
What thermal protection features does the MAX1615EUK-T include?
The MAX1615EUK-T includes thermal-overload protection that activates at +150°C junction temperature, turning off the pass transistor to prevent damage. After cooling by +20°C (typical hysteresis), the device automatically resumes regulation. This self-recovering behavior avoids system lockup during temporary overloads and eliminates the need for external thermal monitoring circuitry.
MAX1615EUK-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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 3.3V, 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.35V @ 30mA
- Current - Output:
- 30mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX1615EUK-T FAQ
1.How can I place an order for MAX1615EUK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1615EUK-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 MAX1615EUK-T reliable?
The price and inventory of MAX1615EUK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1615EUK-T is usually 5 days.
3.What payment methods are accepted for MAX1615EUK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1615EUK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1615EUK-T?
MAX1615EUK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1615EUK-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 MAX1615EUK-T?
For technical support, including MAX1615EUK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1615EUK-T requirements.
6.How does Aetrix verify that MAX1615EUK-T is sourced from the original manufacturer or authorized distributors?
All MAX1615EUK-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 MAX1615EUK-T meets industry standards.
7.What is the process for return or replacement of MAX1615EUK-T?
All MAX1615EUK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1615EUK-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 MAX1615EUK-T part is unused and in its original packaging.
Return procedure for MAX1615EUK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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