My Inquiry
My Account
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 LOW VOLT 500MA
- Quantity:
- Payment:
- Shipping:
Inventory:79,625
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX1935ETA+ from Maxim Integrated is a 500mA low-dropout linear regulator with ±1.5% output voltage accuracy, 175mV dropout at full load, and operation from 2.25V to 5.5V input. It features an internal PMOS pass transistor, adjustable output (0.8V–4.5V) or preset 1.5V option, and active-low power-OK flag-designed for space-constrained portable power rails in PDAs, USB hubs, and docking stations.
For engineers reviewing the MAX1935ETA+ datasheet, MAX1935ETA+ pinout, MAX1935ETA+ application, or MAX1935ETA+ equivalent, key selection criteria include guaranteed 500mA output under 175mV dropout, 0.02µA shutdown current, thermal shutdown at 170°C, POK threshold at 93% of nominal VOUT, and compatibility with 10µF low-ESR ceramic output capacitors.
Technical Context
The MAX1935ETA+ uses an internal 0.8V reference and error amplifier to regulate output via either factory-trimmed feedback (SET = GND) or external resistive divider (SET floating). Its dual-mode comparator selects regulation path based on SET voltage (<35mV for preset mode).
It integrates a 0.4Ω P-channel MOSFET pass transistor-eliminating base-drive current and minimizing quiescent loss-alongside short-circuit protection (1.4A typical limit), thermal shutdown with 20°C hysteresis, and open-drain POK output referenced to 93% of nominal VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 500mA RMS continuous output-supports high-current microprocessor core or I/O rails without derating. |
| Dropout Voltage | 175mV at 500mA-enables stable 3.3V output from a 3.475V Li-ion cell near end-of-discharge. |
| Output Accuracy | ±1.5% over temperature and load-meets tight tolerance requirements for ADC references or FPGA I/O banks. |
| Quiescent Current | 210µA at 100mA load-minimizes battery drain in always-on subsystems like real-time clocks or sensor interfaces. |
| Shutdown Current | 0.02µA-reduces standby power to negligible levels in battery-backed systems during deep sleep. |
| POK Threshold | 93% of nominal VOUT rising edge-provides reliable power-good signaling before system logic enters invalid states. |
| Thermal Shutdown | 170°C junction temperature with 20°C hysteresis-prevents permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
MAX1935ETA+ is housed in a thermally enhanced 8-pin 3mm × 3mm thin QFN package with exposed thermal pad. The package supports high-power dissipation (1.95W at +70°C) when the exposed pad and GND pin are soldered to a large PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 IN | Input supply connection | Accepts 2.25V–5.5V; both pins must be connected externally to reduce impedance and improve transient response. |
| 3 POK | Open-drain power-good output | Active-low signal indicating VOUT < 93% nominal; requires 100kΩ pullup to OUT for logic-level interface with µC. |
| 4 SHDN | Active-low shutdown control | Pulls supply current to 0.02µA when grounded; tolerates up to 6V regardless of VIN/VOUT. |
| 5 GND | Ground and thermal sink | Primary return path and thermal conduction node-must be connected to large copper area or ground plane. |
| 6 SET | Voltage-setting input | Connect to GND for 1.5V preset; connect external divider for 0.8V–4.5V adjustment with 800mV internal reference. |
| 7, 8 OUT | Regulated output | Sources up to 500mA; both pins must be connected externally to reduce IR drop and improve current sharing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode output configuration | Factory-preset 1.5V or user-adjustable 0.8V–4.5V via external resistor divider-enables single BOM for multiple voltage variants. |
| P-channel MOSFET pass element | 0.4Ω RDS(ON) eliminates base-drive current and avoids saturation losses-maintains low IQ across full load range. |
| Power-OK monitoring | Internally referenced 93% VOUT threshold with open-drain output-simplifies system power sequencing without external comparators. |
| Thermal protection with hysteresis | 170°C trip point and 20°C cooldown gap-prevents thermal oscillation during sustained overload while enabling self-recovery. |
| Low-ESR capacitor compatibility | Stable with ≤0.1Ω ESR output capacitors-supports compact, high-frequency ceramic caps (e.g., 10µF X5R 0603) without external compensation. |
Applications
| Notebook Computers | USB Hubs |
|---|---|
Use Scenario: Powering DDR memory termination or chipset I/O rails requiring stable low-noise 1.5V or 1.8V supplies. IC Role / Device Role / Timing Role: Primary LDO delivering regulated core voltage with fast load-transient response to handle burst memory access. Use Value: 40mV typical overshoot during 5mA→500mA load step ensures memory timing margins remain intact. | Use Scenario: Providing clean 3.3V power to USB 2.0 transceivers and hub controller logic in portable docking stations. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling noisy upstream DC/DC converters and suppressing conducted EMI. Use Value: 300µVRMS integrated noise (10Hz–1MHz) prevents bit errors in high-speed USB data links. |
| Cellular Telephones | PDAs |
Use Scenario: Supplying RF front-end bias or baseband processor I/O banks in multi-voltage smartphone architectures. IC Role / Device Role / Timing Role: Low-quiescent LDO enabling ultra-low-power sleep modes while maintaining rapid wake-up capability. Use Value: 0.02µA shutdown current extends battery life during extended idle periods without compromising boot speed. | Use Scenario: Regulating 1.5V or adjustable 1.2V for ARM-based application processors in handheld computing devices. IC Role / Device Role / Timing Role: High-accuracy voltage source ensuring consistent CPU performance across battery discharge curve. Use Value: ±1.5% output accuracy over −40°C to +85°C maintains processor stability without software calibration. |
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 | Fixed 3.3V output only; 265mV dropout at 500mA; higher 250µA quiescent current | Lacks adjustable output and POK signal-requires external monitoring circuitry for power sequencing | Choose when fixed 3.3V output suffices and POK functionality is not required. |
| MCP1826T-1502E/DB | Fixed 1.5V output; 250mV dropout at 500mA; no POK output; 120µA quiescent current | No power-good indication or shutdown control-unsuitable for systems requiring controlled power sequencing | Select for cost-sensitive designs where POK and SHDN are omitted and thermal margin is adequate. |
Compared with TPS79533DRBR and MCP1826T-1502E/DB, the MAX1935ETA+ uniquely combines adjustable output, integrated POK, sub-µA shutdown, and lowest dropout-making it optimal for compact, feature-rich portable power management where flexibility and reliability are critical.
Availability
MAX1935ETA+ is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and USB hubs requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX1935ETA+ belongs to Maxim's low-dropout linear regulator product line, engineered for portable electronics demanding ultra-low quiescent current, small footprint, and robust protection features in battery-powered environments.
FAQ
What is the maximum output current specification for the MAX1935ETA+?
The MAX1935ETA+ guarantees 500mA continuous output current across its operating temperature range (−40°C to +85°C). This rating holds under worst-case conditions including minimum input voltage (2.25V), maximum dropout (175mV), and full thermal load-verified by design and production testing per Maxim's datasheet specifications.
Does the MAX1935ETA+ support adjustable output voltage, and what is the range?
Yes, the MAX1935ETA+ supports adjustable output voltage from 0.8V to 4.5V using an external resistive divider connected to the SET pin. The internal reference is 800mV, and the device automatically enters adjustable mode when SET voltage exceeds 35mV-enabling precise customization without changing the MAX1935ETA+ part number.
What is the function and electrical behavior of the POK pin on the MAX1935ETA+?
The POK pin on the MAX1935ETA+ is an open-drain, active-low power-good output that goes low when VOUT falls below 93% of its nominal value. It remains low during shutdown and requires a 100kΩ pullup resistor to OUT for proper logic-level signaling-providing deterministic power sequencing feedback to microcontrollers without external components.
How does the MAX1935ETA+ achieve low dropout voltage, and what is its typical value at full load?
The MAX1935ETA+ achieves low dropout voltage through an integrated 0.4Ω P-channel MOSFET pass transistor, eliminating base-drive losses inherent in bipolar designs. At 500mA load and 25°C, its typical dropout is 175mV-defined as VIN − VOUT when VOUT is 100mV below nominal-enabling efficient operation even with minimal input-output differential.
What thermal protection mechanisms are built into the MAX1935ETA+?
The MAX1935ETA+ incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +170°C. After shutdown, the device remains off until temperature drops by 20°C (hysteresis), then resumes regulation-preventing latch-up and enabling safe self-recovery during transient overloads without requiring external 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.
MAX1935ETA+ Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
