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Analog Devices Inc./Maxim Integrated MAX1935ETA
- Part No.:
- MAX1935ETA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX1935ETA.pdf
- Description:
- IC REG LINEAR 500MA
- Quantity:
- Payment:
- Shipping:
Inventory:17,741
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Product details
Overview
MAX1935ETA from Maxim Integrated is an adjustable-output, 500mA low-dropout linear regulator with ±1.5% output voltage accuracy, 175mV dropout at full load, and 210µA ground current - designed for space-constrained portable power rails in USB hubs, docking stations, and handheld computing devices.
For engineers reviewing the MAX1935ETA datasheet, MAX1935ETA pinout, MAX1935ETA application, or MAX1935ETA equivalent, key selection criteria include its 0.8V–4.5V adjustable output range, active-low POK indicator, 0.02µA shutdown current, thermal shutdown at +170°C, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The MAX1935ETA uses an internal PMOS pass transistor with ~0.4Ω RDS(ON), enabling low dropout and eliminating base-drive current loss typical of PNP-based regulators. Its Dual Mode™ architecture selects between preset and adjustable operation based on SET pin voltage (threshold: 35–125mV).
Regulation relies on a precision 0.8V internal reference and error amplifier comparing feedback from either internal resistors (SET = GND) or external divider (SET floating). The open-drain POK output asserts low when VOUT falls below 89–97% of nominal, with 100kΩ pullup to OUT recommended.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 500mA guaranteed - supports high-current digital loads without derating at +85°C ambient. |
| Dropout Voltage | 175mV at 500mA - enables operation down to VIN = VOUT + 0.175V, extending battery runtime in 2.25V–5.5V input systems. |
| Output Accuracy | ±1.5% at +25°C, ±3% over -40°C to +85°C - ensures stable core/logic rail compliance for microcontrollers and FPGAs. |
| Adjustable Range | 0.8V to 4.5V - covers I/O voltages (1.2V, 1.8V, 2.5V, 3.3V) and analog subsystems via external resistor divider. |
| Ground Current | 210µA at 100mA load - minimizes quiescent loss in always-on subsystems like real-time clocks or wake-up circuitry. |
| Shutdown Current | 0.02µA - reduces standby power to negligible levels in battery-backed applications such as PDAs and cordless handsets. |
| POK Threshold | 93% of nominal VOUT (±4%) - provides reliable power-good signaling for µC reset sequencing without external comparators. |
Pinout & Package
MAX1935ETA is housed in an 8-pin, 3mm × 3mm thin QFN package with exposed thermal pad (T833-1), optimized for PCB heat dissipation via soldered GND connection to large copper area or multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 IN | Input supply connection | Dual pins reduce trace inductance and IR drop; requires ≥1µF ceramic bypass to GND close to package. |
| 3 POK | Open-drain power-ok output | Active-low signal indicating VOUT ≥93% of regulation; needs 100kΩ pullup to OUT for logic-level interface. |
| 4 SHDN | Active-low shutdown control | Drives <0.02µA quiescent current when pulled low; tolerates up to +6V independent of VIN/VOUT. |
| 5 GND | Power and signal ground | Shared with exposed thermal pad; must be soldered to PCB ground plane for thermal performance and noise immunity. |
| 6 SET | Voltage-setting input | Dual-mode selector: ≤35mV → preset mode; 0.8V reference → adjustable mode with external R-divider. |
| 7, 8 OUT | Regulated output | Dual pins lower output impedance; requires ≥10µF low-ESR (<0.1Ω) ceramic capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ SET input | Automatically selects preset (SET = GND) or adjustable (SET = 0.8V) operation - eliminates BOM variants and simplifies design reuse. |
| Thermal shutdown | +170°C trip with +20°C hysteresis - enables safe fault recovery during sustained overload without latch-off or manual reset. |
| Short-circuit protection | 1.4A typical current limit - sustains indefinite output short to GND while limiting junction temperature rise. |
| Low-noise regulation | 300µVRMS (10Hz–1MHz) - meets noise-sensitive analog supply requirements without additional LDO filtering stages. |
| High PSRR | 60dB at 1kHz, 40dB at 100kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
Applications
| USB Hub Power Management | Docking Station Auxiliary Rails |
|---|---|
|
Use Scenario: Providing clean, regulated 3.3V/1.8V rails to USB 2.0 transceivers and controller logic in compact hub ICs. IC Role / Device Role / Timing Role: Primary post-regulator delivering low-noise, fast-transient power with POK signaling to host controller. Use Value: 40mV load-step overshoot and 300µVRMS noise ensure USB signal integrity and meet USB-IF EMI limits without added ferrite beads. |
Use Scenario: Generating configurable auxiliary voltages (e.g., 2.5V for card readers, 1.2V for FPGA I/O) in multi-port docking stations. IC Role / Device Role / Timing Role: Adjustable LDO supplying isolated subsystems with independent enable/shutdown control per port. Use Value: 0.02µA shutdown current and dual-mode SET allow dynamic rail enablement, reducing system standby power by >90%. |
| Handheld PDA Core Supply | Base Station Control Module |
|
Use Scenario: Powering ARM9/ARM11 application processors and DDR memory interfaces in palm-sized PDAs with Li-ion battery input. IC Role / Device Role / Timing Role: Main core LDO delivering 1.2V/1.3V at 500mA with tight ±1.5% accuracy across temperature. Use Value: 175mV dropout extends usable battery range down to 2.45V input, increasing runtime by ~12% versus higher-dropout alternatives. |
Use Scenario: Supplying FPGA configuration, CPLD logic, and sensor interface circuits in telecom base station control cards. IC Role / Device Role / Timing Role: High-reliability LDO with thermal shutdown and short-circuit protection for unattended industrial environments. Use Value: +170°C thermal shutdown and continuous short-circuit tolerance prevent field failures during surge or miswiring events. |
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 |
|---|---|---|---|
| TPS79533DRBR | Preset 3.3V only; 265mV dropout at 500mA; 250µA IQ; no POK output; SOT-23-5 package. | Lacks adjustable output and power-good signaling - suitable only where fixed 3.3V and minimal feature set suffice. | Choose when board space is critical and system does not require POK monitoring or voltage flexibility. |
| MCP1826-3302E/DB | Preset 3.3V; 350mV dropout at 500mA; 85µA IQ; thermal shutdown; 5-pin SOT-23 package. | No shutdown pin or POK; lower max current (300mA); wider dropout reduces battery efficiency in low-VIN scenarios. | Prefer for cost-sensitive, low-power applications where 300mA load and absence of POK are acceptable. |
Compared with TPS79533DRBR and MCP1826-3302E/DB, MAX1935ETA offers unique value through its adjustable output range (0.8V–4.5V), integrated POK indicator, lowest dropout (175mV), and ultra-low shutdown current (0.02µA), making it optimal for multi-rail, battery-sensitive, and system-monitoring designs.
Availability
MAX1935ETA is available at Aetrix Electronics and suitable for USB hubs, docking stations, and handheld computing applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX1935ETA 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 markets.
The MAX1935ETA belongs to Maxim's low-quiescent-current LDO family, engineered for portable and battery-powered systems where efficiency, small size, and precise voltage regulation are critical.
FAQ
What output voltage does the MAX1935ETA provide?
The MAX1935ETA is an adjustable-output LDO with no factory-preset voltage. Its output is set externally via a resistor divider from OUT to SET, supporting 0.8V to 4.5V. The SET pin senses 0.8V internally, and the output follows VOUT = 0.8V × (1 + R1/R2). This differs from fixed-voltage variants like MAX1935ETA15 (1.5V).
How does the POK pin function on the MAX1935ETA?
The POK pin on the MAX1935ETA is an open-drain, active-low output that goes high-impedance when VOUT reaches ≥93% of its nominal value and pulls low otherwise. It requires a 100kΩ pullup resistor to OUT. During shutdown (SHDN = GND), POK is forcibly held low regardless of output voltage - enabling reliable power sequencing in µC-based systems.
What is the minimum input voltage required for the MAX1935ETA to regulate at 3.3V output?
For 3.3V output, the MAX1935ETA requires a minimum input voltage of 3.475V under full 500mA load (3.3V + 175mV dropout). At lighter loads, dropout decreases - e.g., ~147mV at 500mA and VOUT = 4.0V. Input must also exceed the 2.25V absolute minimum and 1.85V UVLO threshold to enable regulation.
Can the MAX1935ETA be used with ceramic output capacitors?
Yes, the MAX1935ETA is explicitly designed for ceramic output capacitors: a 10µF, low-ESR (<0.1Ω) X5R/X7R type is recommended and validated in the datasheet. Ceramic caps ensure stability, minimize board area, and deliver superior transient response versus tantalum or aluminum electrolytic alternatives.
Does the MAX1935ETA include thermal protection?
Yes, the MAX1935ETA incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +170°C. After cooling by +20°C hysteresis, regulation resumes automatically. This protects against sustained overloads or poor PCB heatsinking without requiring external circuitry or system intervention.
MAX1935ETA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- 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 FAQ
1.How can I place an order for MAX1935ETA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1935ETA 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 reliable?
The price and inventory of MAX1935ETA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1935ETA is usually 5 days.
3.What payment methods are accepted for MAX1935ETA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1935ETA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1935ETA?
MAX1935ETA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1935ETA 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?
For technical support, including MAX1935ETA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1935ETA requirements.
6.How does Aetrix verify that MAX1935ETA is sourced from the original manufacturer or authorized distributors?
All MAX1935ETA 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 meets industry standards.
7.What is the process for return or replacement of MAX1935ETA?
All MAX1935ETA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1935ETA, 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 part is unused and in its original packaging.
Return procedure for MAX1935ETA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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