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Analog Devices Inc./Maxim Integrated MAX1935ETA15+T
- Part No.:
- MAX1935ETA15+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX1935ETA15+T.pdf
- Description:
- IC REG LINEAR 1.5V 500MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,876
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Product details
Overview
MAX1935ETA15+T from Maxim Integrated is a 1.5V fixed-output, 500mA low-dropout linear regulator with ±1.5% output voltage accuracy, 175mV dropout at full load, and 210μA ground current. It employs an internal PMOS pass transistor in a thermally enhanced 3mm × 3mm thin DFN package and is designed for power rail regulation in portable battery-powered systems such as cellular phones and USB hubs.
For engineers reviewing the MAX1935ETA15+T datasheet, MAX1935ETA15+T pinout, MAX1935ETA15+T application, or MAX1935ETA15+T equivalent, key selection criteria include guaranteed 500mA output under 175mV dropout, active-low POK monitoring, 0.02μA shutdown current, thermal shutdown at +170°C, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The MAX1935ETA15+T uses a P-channel MOSFET pass element with 0.4Ω typical RDS(ON), enabling low dropout and eliminating base-drive current loss. Its dual-mode feedback architecture selects preset regulation (1.5V) when SET is grounded, verified by top-mark "ADB" and suffix "15".
It integrates a precision 0.8V reference, error amplifier, thermal sensor, and current-limit circuitry that clamps output to 1.4A typical during short-circuit events. The open-drain POK output asserts low when VOUT falls below 93% of nominal, requiring an external 100kΩ pullup to OUT for logic-level signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±1.5% at +25°C; ±3% over -40°C to +85°C - ensures stable core voltage for low-power microcontrollers. |
| Max Output Current | 500mA guaranteed - supports single-rail powering of RF transceivers or USB peripheral ICs. |
| Dropout Voltage | 175mV at 500mA - enables operation down to 1.675V input, extending usable life of single-cell Li-ion batteries. |
| Ground Current | 210μA at 1mA load - minimizes quiescent drain in always-on subsystems like real-time clocks. |
| Shutdown Current | 0.02μA - reduces standby power to negligible levels in battery-backed sleep modes. |
| Thermal Shutdown | Activates at +170°C with +20°C hysteresis - provides self-recovery protection during sustained overload or poor PCB heatsinking. |
| Power-OK Threshold | 93% of nominal VOUT (1.395V) rising edge - delivers deterministic reset signaling to host µC without external comparators. |
Pinout & Package
MAX1935ETA15+T is housed in an 8-pin, 3mm × 3mm thin DFN package with exposed thermal pad (package code T833+2C). The exposed pad must be soldered to PCB ground plane for thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - IN | Input supply connection | Accepts 2.25V–5.5V; both pins must be tied together externally and bypassed with 1µF capacitor to GND. |
| 3 - POK | Open-drain power-good indicator | Active-low signal; requires 100kΩ pullup to OUT; sinks 2mA max; asserts low if VOUT < 1.395V. |
| 4 - SHDN | Active-low enable control | Drives device into 0.02μA shutdown when pulled ≤0.6V; tolerates up to +6V; connect to IN for always-on operation. |
| 5 - GND | Power and signal ground | Shared with exposed thermal pad; must be connected to large copper area or ground plane for thermal dissipation and noise immunity. |
| 6 - SET | Feedback node selection | Internally tied to GND for 1.5V preset mode; unused in MAX1935ETA15+T; leave floating or grounded per layout best practice. |
| 7, 8 - OUT | Regulated output terminal | Sources up to 500mA; bypassed with 10µF low-ESR ceramic capacitor to GND; both pins must be tied together externally. |
Key Features
| Feature | Design Value |
|---|---|
| Preset 1.5V output | Factory-trimmed, no external resistors required - eliminates BOM cost and layout complexity for fixed-voltage rails. |
| Low 175mV dropout | Enables >90% efficiency at 500mA with 1.675V minimum input - critical for single-cell Li-ion or NiMH battery systems. |
| 0.02μA shutdown current | Reduces annual battery drain to <0.16mAh - extends shelf life of portable medical or IoT sensors. |
| Integrated thermal shutdown | Self-resetting protection at +170°C with +20°C hysteresis - avoids latch-up failure during transient overloads or poor ventilation. |
| Power-OK (POK) output | Dedicated open-drain status signal referenced to actual VOUT - replaces discrete supervisor ICs in space-constrained designs. |
Applications
| Cellular Telephones | USB Hubs |
|---|---|
|
Use Scenario: Powering baseband processor I/O rails and RF front-end bias supplies in compact handsets. IC Role / Device Role / Timing Role: Primary LDO delivering clean, regulated 1.5V to low-noise analog sections and digital I/O banks. Use Value: 175mV dropout preserves operating time as battery voltage declines below 2.0V; POK enables graceful system reset before brownout. |
Use Scenario: Providing stable 1.5V supply to USB 2.0 transceiver PHY and hub controller logic. IC Role / Device Role / Timing Role: Point-of-load regulator ensuring VDDIO compliance across USB enumeration and high-speed data bursts. Use Value: 500mA rating supports simultaneous charging and data transfer; low ground current minimizes shared-rail coupling noise. |
| Palmtop Computers | Docking Stations |
|
Use Scenario: Regulating auxiliary voltage for touch controller, backlight driver, and SD card interface. IC Role / Device Role / Timing Role: Secondary LDO supplying non-core peripherals with independent enable and fault reporting. Use Value: Active-low SHDN allows coordinated power sequencing with main SoC; thermal protection prevents overheating in sealed enclosures. |
Use Scenario: Generating 1.5V for PCIe switch configuration logic and USB-C CC logic in multi-port docking solutions. IC Role / Device Role / Timing Role: Dedicated regulator for hot-plug detection and enumeration circuits requiring fast startup and reliable POK assertion. Use Value: 40µs startup time (SHDN→POK high) meets USB Type-C specification timing for port partner identification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A2015PDQNR | 1.5V fixed, 300mA output, 130mV dropout at 300mA, 6.5μA IQ - lower current, lower dropout, higher quiescent current. | Limited to sub-300mA loads; unsuitable for 500mA USB hub or baseband rails. | Select only when load current ≤300mA and ultra-low dropout is prioritized over shutdown current. |
| MCP1703T-1502E/MB | 1.5V fixed, 250mA output, 600mV dropout at 250mA, 2μA IQ - lower IQ but higher dropout and lower current capability. | Cannot sustain 500mA loads; requires ≥2.1V input for regulation - incompatible with deep-discharge battery operation. | Consider only for ultra-low-power sensor nodes where 250mA peak current suffices and 600mV dropout is acceptable. |
Compared with MAX1935ETA15+T, TPS7A2015PDQNR offers lower dropout but cannot deliver 500mA, while MCP1703T-1502E/MB provides lower quiescent current but fails to meet the 500mA and 175mV dropout requirements essential for portable communications equipment.
Availability
MAX1935ETA15+T is available at Aetrix Electronics and suitable for cellular telephones, USB hubs, and palmtop computers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1935ETA15+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, communications, and consumer applications.
The MAX1935 series targets portable and battery-powered systems needing high-current, low-dropout regulation in minimal footprint - specifically optimized for space- and efficiency-constrained handheld electronics.
FAQ
What is the output voltage tolerance of the MAX1935ETA15+T over temperature and load?
The MAX1935ETA15+T guarantees ±1.5% output voltage accuracy at +25°C with 100mA load. Over the full -40°C to +85°C operating range and 1mA–500mA load, output voltage remains within ±3% of 1.5V when input voltage exceeds VOUT + 0.5V. This is confirmed in the Electrical Characteristics table on page 3 of the official datasheet.
Does the MAX1935ETA15+T require external resistors to set its output voltage?
No. The MAX1935ETA15+T is factory-trimmed to a fixed 1.5V output; the SET pin is internally connected for preset mode and does not require external resistors. Its top-mark "ADB" and suffix "15" explicitly denote the 1.5V variant - unlike adjustable versions such as MAX1935ETA.
How does the POK output function on the MAX1935ETA15+T?
The POK pin on the MAX1935ETA15+T is an open-drain, active-low output that goes high-impedance when VOUT reaches ≥93% of 1.5V (i.e., ≥1.395V), and pulls low otherwise. It requires a 100kΩ pullup resistor to OUT and can directly interface with microcontroller GPIOs for power-good monitoring without additional components.
What thermal considerations apply to the MAX1935ETA15+T in a 4-layer PCB design?
On a standard 4-layer board, the MAX1935ETA15+T exhibits θJA = 41°C/W and θJC = 8°C/W. To maintain junction temperature ≤+150°C, the exposed thermal pad must be soldered to a solid ground plane using multiple thermal vias. Derating begins above +70°C ambient: 24.4mW/°C reduction in allowable power dissipation.
Can the MAX1935ETA15+T operate from a 2.25V input while delivering 500mA at 1.5V?
Yes. With a 2.25V input, the MAX1935ETA15+T sustains 500mA output as long as the dropout margin (2.25V − 1.5V = 0.75V) exceeds the specified 175mV maximum. The device's P-channel MOSFET architecture ensures stable regulation even at this 750mV headroom - well above the worst-case dropout requirement.
MAX1935ETA15+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 400 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Power Good
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN-EP (3x3)
MAX1935ETA15+T FAQ
1.How can I place an order for MAX1935ETA15+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1935ETA15+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 MAX1935ETA15+T reliable?
The price and inventory of MAX1935ETA15+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1935ETA15+T is usually 5 days.
3.What payment methods are accepted for MAX1935ETA15+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1935ETA15+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1935ETA15+T?
MAX1935ETA15+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1935ETA15+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 MAX1935ETA15+T?
For technical support, including MAX1935ETA15+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1935ETA15+T requirements.
6.How does Aetrix verify that MAX1935ETA15+T is sourced from the original manufacturer or authorized distributors?
All MAX1935ETA15+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 MAX1935ETA15+T meets industry standards.
7.What is the process for return or replacement of MAX1935ETA15+T?
All MAX1935ETA15+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1935ETA15+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 MAX1935ETA15+T part is unused and in its original packaging.
Return procedure for MAX1935ETA15+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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