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Analog Devices Inc./Maxim Integrated MAX1935ETA-T
- Part No.:
- MAX1935ETA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX1935ETA-T.pdf
- Description:
- IC REG LIN POS ADJ 500MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,769
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Product details
Overview
The MAX1935ETA-T from Maxim Integrated is a low-dropout linear regulator with PMOS pass transistor architecture, delivering guaranteed 500mA output current at ≤175mV dropout (at 500mA), ±1.5% output voltage accuracy, and adjustable output range from 0.8V to 4.5V via external resistor divider. It serves as a primary power rail regulator in portable battery-powered systems requiring tight voltage tolerance and ultra-low quiescent current.
For engineers reviewing the MAX1935ETA-T datasheet, MAX1935ETA-T pinout, MAX1935ETA-T application, or MAX1935ETA-T equivalent, key selection criteria include dropout performance at full load, thermal shutdown threshold (170°C), POK output logic behavior, shutdown current (0.02µA), and compatibility with low-ESR ceramic output capacitors (≤0.1Ω).
Technical Context
The MAX1935ETA-T implements a dual-mode feedback architecture: when SET pin voltage falls below 35mV, it engages internal preset regulation (factory-trimmed); above that threshold, it switches to adjustable mode using an external resistive divider referenced to 800mV SET threshold. Its P-channel MOSFET pass element eliminates base-drive current, enabling 210µA ground current at light load.
Regulation stability relies on strict output capacitor ESR ≤0.1Ω and minimum 10µF capacitance; the open-drain POK output asserts low when VOUT drops below 93% of nominal, requiring external 100kΩ pull-up to OUT. Thermal protection activates at 170°C junction temperature with 20°C hysteresis, forcing pulsed operation under sustained overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 500mA continuous - supports single-rail powering of core logic or RF sections without derating. |
| Dropout Voltage | 175mV at 500mA - enables >95% battery utilization down to 2.25V input, critical for Li-ion end-of-discharge operation. |
| Output Accuracy | ±1.5% at +25°C, ±3% over -40°C to +85°C - meets tight tolerance requirements for DSP, FPGA I/O, or memory rails. |
| Quiescent Current | 210µA typical at 1mA load - minimizes standby power loss in always-on subsystems like USB suspend states. |
| Shutdown Current | 0.02µA maximum - extends shelf life and battery hold time in storage or deep-sleep modes. |
| POK Threshold | 93% of nominal VOUT rising edge - provides precise undervoltage detection for system reset sequencing or brown-out warning. |
| Thermal Shutdown | 170°C activation with 20°C hysteresis - prevents permanent damage during transient overloads while allowing recovery without manual reset. |
Pinout & Package
The MAX1935ETA-T is housed in an 8-pin 3mm × 3mm thin DFN package with exposed thermal pad, rated for 1.95W dissipation at +70°C ambient (θJA = 41°C/W on four-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 IN | Input supply connection | Accepts 2.25V–5.5V; must be bypassed with ≥1µF ceramic capacitor; both pins tied externally for current sharing. |
| 3 POK | Open-drain power-good indicator | Active-low signal asserting when VOUT < 93% nominal; requires 100kΩ pull-up to OUT for logic-level output. |
| 4 SHDN | Active-low enable control | Drives low to enter 0.02µA shutdown; tolerates up to +6V regardless of VIN/VOUT; ties to IN for always-on operation. |
| 5 GND | Power and signal reference | Shared ground return and thermal path; exposed pad must be soldered to PCB ground plane for thermal integrity. |
| 6 SET | Voltage-setting feedback node | 0.8V reference threshold; grounded for preset mode; connected to resistor divider for adjustable output (0.8V–4.5V). |
| 7, 8 OUT | Regulated output terminal | Sources up to 500mA; requires ≥10µF low-ESR (≤0.1Ω) ceramic capacitor to GND for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode feedback selection | Automatic switch between factory-preset (SET < 35mV) and adjustable (SET > 35mV) modes - eliminates BOM variants for same footprint. |
| P-channel MOSFET pass element | 0.4Ω RDS(ON) enables low dropout and zero base-drive current - reduces ground current by >50% vs. PNP-based LDOs at light loads. |
| Integrated thermal protection | 170°C shutdown with 20°C hysteresis - sustains safe pulsed operation during fault conditions without latch-up or external circuitry. |
| Low-noise output stage | 300µVRMS integrated noise (10Hz–1MHz) with 10µF COUT - suitable for noise-sensitive analog rails (ADC references, PLL supplies). |
| Robust short-circuit handling | Continuous short-to-ground capability with 1.4A typical current limit - protects against accidental board shorts without shutdown or damage. |
Applications
| Notebook Computers | Cellular Telephones |
|---|---|
Use Scenario: Core voltage regulation for Intel Atom or ARM Cortex-A series SoCs during active and dynamic frequency scaling. IC Role / Device Role / Timing Role: Primary 1.2V/1.8V/3.3V LDO supplying processor I/O and memory interface rails with fast load-transient response. Use Value: 40mV typical overshoot during 5mA→500mA load step ensures stable SoC operation without reset or data corruption. | Use Scenario: Powering RF transceiver modules (e.g., Qualcomm QTRU series) requiring clean, low-noise 2.8V supply. IC Role / Device Role / Timing Role: Noise-suppressed post-regulator for RF front-end biasing, decoupling switching noise from PA/LNA stages. Use Value: 300µVRMS output noise and 60dB PSRR at 100kHz prevent reciprocal mixing and adjacent-channel interference. |
| USB Hubs | Docking Stations |
Use Scenario: Providing regulated 5V or 3.3V to downstream USB 2.0 ports with hot-plug detection and overcurrent protection. IC Role / Device Role / Timing Role: Secondary power rail generator with POK signaling to host controller for port enumeration readiness. Use Value: POK assertion within 40µs of VOUT stabilization enables deterministic USB enumeration timing per USB 2.0 spec. | Use Scenario: Supplying auxiliary 1.5V/1.8V rails to PCIe switch controllers and SATA bridge ICs in multi-interface docking solutions. IC Role / Device Role / Timing Role: High-current, thermally robust LDO supporting burst-mode data transfers across multiple high-speed interfaces. Use Value: 1.95W max power dissipation and exposed thermal pad allow sustained 500mA delivery without thermal throttling during 4K video streaming. |
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 |
|---|---|---|---|
| TPS79533DCQ | Fixed 3.3V output only; 160mV dropout at 500mA; higher 250µA quiescent current; SOT-223 package (larger footprint, lower thermal performance). | Lacks adjustable output and POK output; unsuitable for systems requiring voltage flexibility or power sequencing signals. | Select only if fixed 3.3V output suffices and board space allows SOT-223; verify thermal margin with θJA = 60°C/W. |
| MCP1825-3302E/DB | Fixed 3.3V output; 250mV dropout at 500mA; no POK output; 100µA shutdown current; 6-pin SOT-23 package. | No power-good signaling or thermal hysteresis; limited to simpler systems without sequencing or fault reporting needs. | Use where cost is primary constraint and POK/thermal features are non-critical; confirm dropout margin at end-of-battery life. |
Compared with TPS79533DCQ and MCP1825-3302E/DB, the MAX1935ETA-T uniquely combines adjustable output, integrated POK, sub-0.1µA shutdown, and superior thermal performance in a 3mm×3mm DFN-enabling compact, feature-rich power designs where voltage flexibility and system-level monitoring are required.
Availability
The MAX1935ETA-T is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and USB hubs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1935ETA-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 MAX1935ETA-T belongs to Maxim's low-quiescent-current LDO family, engineered specifically for portable and battery-operated equipment where extended runtime, small form factor, and reliable power sequencing are essential.
FAQ
What output voltage options does the MAX1935ETA-T support?
Unlike fixed-output variants (e.g., MAX1935ETA15), the MAX1935ETA-T is configured for adjustable operation with output voltage settable from 0.8V to 4.5V using an external resistor divider connected to the SET pin. The internal SET reference voltage is precisely 800mV, and the device enters preset mode only when SET is pulled below 35mV-making MAX1935ETA-T inherently adjustable unless externally forced into preset mode.
How does the POK output of the MAX1935ETA-T behave during shutdown?
During shutdown (SHDN = GND), the MAX1935ETA-T forces the POK output low regardless of output voltage level-this is a hardwired behavior per the datasheet. The POK pin remains low until SHDN is returned high and VOUT rises above 93% of its nominal value, ensuring unambiguous power-fail signaling during entry and exit from low-power states.
Can the MAX1935ETA-T operate with ceramic output capacitors?
Yes-the MAX1935ETA-T is explicitly designed for use with low-ESR ceramic capacitors: a minimum 10µF X5R/X7R ceramic capacitor with ESR ≤0.1Ω is required at the OUT pin for stability and optimal transient response. This eliminates need for tantalum or aluminum electrolytic capacitors, reducing board area and improving reliability in portable applications.
What is the maximum allowable input voltage for the MAX1935ETA-T's SHDN pin?
The SHDN pin of the MAX1935ETA-T tolerates voltages up to +6V independent of VIN and VOUT levels, as specified in Absolute Maximum Ratings. This allows direct interfacing with 5V logic families or microcontroller GPIOs without level-shifting, simplifying system design while maintaining robustness against overvoltage transients.
Does the MAX1935ETA-T require special PCB layout considerations for thermal performance?
Yes-the MAX1935ETA-T's 3mm×3mm thin DFN package includes an exposed thermal pad on the underside that must be soldered to a large copper pour or internal ground plane using multiple thermal vias. Failure to do so degrades θJA from 41°C/W to >60°C/W, risking thermal shutdown under 500mA load at elevated ambient temperatures.
MAX1935ETA-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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 4.5V
- Voltage Dropout (Max):
- 0.275V @ 500mA
- 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 (3x3)
MAX1935ETA-T FAQ
1.How can I place an order for MAX1935ETA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1935ETA-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 MAX1935ETA-T reliable?
The price and inventory of MAX1935ETA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1935ETA-T is usually 5 days.
3.What payment methods are accepted for MAX1935ETA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1935ETA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1935ETA-T?
MAX1935ETA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1935ETA-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 MAX1935ETA-T?
For technical support, including MAX1935ETA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1935ETA-T requirements.
6.How does Aetrix verify that MAX1935ETA-T is sourced from the original manufacturer or authorized distributors?
All MAX1935ETA-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 MAX1935ETA-T meets industry standards.
7.What is the process for return or replacement of MAX1935ETA-T?
All MAX1935ETA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1935ETA-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 MAX1935ETA-T part is unused and in its original packaging.
Return procedure for MAX1935ETA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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