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Analog Devices Inc./Maxim Integrated MAX8868EUK33-T
- Part No.:
- MAX8868EUK33-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8868EUK33-T.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:4,800
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Product details
Overview
MAX8868EUK33-T from Maxim Integrated is a low-noise, low-dropout linear regulator with a factory-preset 3.3V output, 150mA maximum output current, 30µVRMS output noise, and 165mV dropout at full load. It features an internal P-channel MOSFET pass transistor, 10nA logic-controlled shutdown, and auto-discharge functionality - designed for space-constrained, battery-powered portable electronics requiring clean, stable voltage rails.
For engineers reviewing the MAX8868EUK33-T datasheet, MAX8868EUK33-T pinout, MAX8868EUK33-T application, or MAX8868EUK33-T equivalent, key selection criteria include its 3.3V fixed output accuracy (±1.4%), ultra-low quiescent current (100µA in operation, 10nA in shutdown), SOT23-5 package footprint, and integrated reverse-battery protection for robust power management in handheld instruments and communication devices.
Technical Context
The MAX8868EUK33-T employs a 1.25V bandgap reference and error amplifier to regulate output via an internal P-channel MOSFET pass transistor (typical RDS(ON) = 1.1Ω). Its BP pin connects to an internal 200kΩ resistor forming an 80Hz low-pass filter with an external 0.01µF capacitor, enabling precise noise reduction.
Unlike the MAX8867, the MAX8868EUK33-T integrates active auto-discharge: during SHDN assertion, it sinks output current through an internal discharge path to ground. Thermal shutdown activates at +155°C with +15°C hysteresis, and current limiting is set to 160–390mA (min/max) to protect against sustained short circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.4% - ensures stable MCU core or RF front-end bias without external feedback components. |
| Max Output Current | 150mA - sufficient for powering low-power microcontrollers, sensors, or RF ICs in portable systems. |
| Dropout Voltage | 165mV at 150mA - enables operation down to VIN = 3.465V, extending usable battery life in single-cell Li-ion or alkaline applications. |
| Output Noise | 30µVRMS (10Hz–100kHz) - critical for noise-sensitive analog circuits like ADC references or RF synthesizers. |
| Quiescent Current | 100µA (active), 10nA (shutdown) - minimizes standby power loss in always-on or wake-on-event designs. |
| Input Voltage Range | 2.5V to 6.5V - supports single-cell Li-ion (2.7–4.2V), dual-cell alkaline (3–6V), and regulated 5V rails. |
| Auto-Discharge | Active discharge to GND on SHDN assertion - prevents residual output voltage from interfering with system reset sequencing or downstream logic states. |
Pinout & Package
SOT23-5 regular package (JEDEC MO-178AA), 2.9mm × 1.6mm footprint, 1.1mm height, thermal pad connected to GND for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low enable input | Logic low (≤0.4V) disables regulator and initiates auto-discharge; tie to IN for always-on operation. |
| 2 - GND | Power and thermal ground | Provides return path for load current and serves as primary heat sink - must be soldered to large PCB copper area. |
| 3 - IN | Input supply connection | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass capacitor close to pin for stability and line-transient suppression. |
| 4 - OUT | Regulated output | Delivers up to 150mA at 3.3V; requires ≥1µF low-ESR ceramic capacitor to maintain stability across temperature and load. |
| 5 - BP | Noise-reduction bypass node | Connects to internal 200kΩ resistor; 0.01µF ceramic capacitor reduces output noise by filtering reference noise - critical for low-noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Internally sinks OUT to GND during shutdown - eliminates need for external discharge FET or resistor network in reset-critical systems. |
| Reverse battery protection | Limits reverse current to ≤1mA when VIN or SHDN falls below GND - prevents damage during incorrect battery insertion in consumer handhelds. |
| P-channel MOSFET pass element | 1.1Ω typical RDS(ON) - eliminates base-drive current loss, enabling constant 100µA IQ regardless of load or dropout condition. |
| Thermal and short-circuit protection | Shuts down at +155°C junction temp with +15°C hysteresis; survives indefinite output short to GND - ensures reliability in unattended embedded deployments. |
| Preset 3.3V output | Factory-trimmed ±1.4% accuracy - removes external resistor divider, saving board space and eliminating drift-related calibration in volume production. |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
Use Scenario: Powering baseband processor I/O banks and RF transceiver bias rails in compact GSM/UMTS handsets. IC Role / Device Role / Timing Role: Low-noise 3.3V LDO supplying noise-sensitive analog sections while maintaining tight regulation during burst-mode transmission. Use Value: 30µVRMS noise and 165mV dropout extend talk time and prevent RF desense caused by supply ripple or brownout during peak current draw. | Use Scenario: Providing isolated, stable 3.3V supply for PCMCIA card controllers and interface logic in laptop expansion slots. IC Role / Device Role / Timing Role: Regulator ensuring clean power during hot-plug insertion and dynamic bus arbitration sequences. Use Value: Auto-discharge clears residual VOUT within microseconds after card ejection, preventing backfeeding into host controller and meeting PCMCIA electrical compliance. |
| Palmtop Computers | Electronic Planners |
Use Scenario: Supplying real-time clock (RTC), SRAM backup, and touch-screen controller in palm-sized PDAs with coin-cell or rechargeable battery sources. IC Role / Device Role / Timing Role: Always-on LDO delivering ultra-low-quiescent 3.3V rail during deep-sleep modes. Use Value: 10nA shutdown current minimizes battery drain over weeks of standby, while 100µA operating IQ supports rapid wake-up without voltage sag. | Use Scenario: Powering LCD driver ICs and microcontroller peripherals in low-cost electronic organizers with limited PCB area. IC Role / Device Role / Timing Role: Compact, fixed-output regulator replacing discrete solutions to reduce BOM count and layout complexity. Use Value: SOT23-5 footprint and preset 3.3V eliminate trimming resistors and routing overhead, accelerating design-in for cost-sensitive consumer products. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76333DBVR | 3.3V fixed output, 150mA, 120mV dropout at 150mA, 35µVRMS noise, no auto-discharge, 1µA IQ in shutdown | Lacks active output discharge; requires external circuitry for reset-safe shutdown in systems sensitive to floating VOUT | Preferred where lowest possible dropout is critical and auto-discharge is not required. |
| MCP1700T-3302E/MB | 3.3V fixed output, 250mA, 600mV dropout at 250mA, 30µVRMS noise, 1.6µA IQ, no auto-discharge or reverse-battery protection | Higher dropout limits usable input range; lacks reverse-battery and thermal protection features of MAX8868EUK33-T | Suitable for non-battery applications with ample headroom and simplified protection requirements. |
Compared with TPS76333DBVR and MCP1700T-3302E/MB, the MAX8868EUK33-T uniquely combines auto-discharge, reverse-battery protection, and sub-100nA shutdown current - making it optimal for battery-powered portable systems requiring fail-safe power sequencing and extended shelf life.
Availability
MAX8868EUK33-T is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, palmtop computers, and electronic planners requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX8868EUK33-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX8867/MAX8868 product line was designed specifically for battery-powered portable electronics needing ultra-low-noise, low-quiescent-current regulation in minimal PCB area - targeting cellular telephones, modems, and handheld instrumentation.
FAQ
What is the output voltage tolerance of the MAX8868EUK33-T?
The MAX8868EUK33-T has a factory-preset output voltage of 3.3V with a tolerance of ±1.4% over the full operating temperature range (-40°C to +85°C). This specification is guaranteed by production testing and statistical correlation, ensuring consistent performance across units without requiring external trimming components in the MAX8868EUK33-T design.
Does the MAX8868EUK33-T require an external capacitor on the BP pin?
Yes, the MAX8868EUK33-T requires a 0.01µF ceramic capacitor between the BP pin and ground to achieve its specified 30µVRMS output noise performance. This capacitor forms a low-pass filter with an internal 200kΩ resistor, suppressing reference noise. Larger values (e.g., 0.1µF) increase startup time without meaningful noise improvement, and values above 0.1µF are not recommended per the MAX8868EUK33-T datasheet.
How does the auto-discharge feature work in the MAX8868EUK33-T?
When the SHDN pin of the MAX8868EUK33-T is pulled low, the device not only disables regulation but also activates an internal discharge switch between the OUT pin and GND. This actively pulls the output voltage down to ground potential, typically within tens of microseconds. This behavior is exclusive to the MAX8868 series and is absent in the MAX8867EUK33-T, making the MAX8868EUK33-T ideal for systems requiring clean power-down sequencing.
What thermal protection mechanisms are built into the MAX8868EUK33-T?
The MAX8868EUK33-T incorporates thermal-overload protection that disables the pass transistor when the junction temperature exceeds +155°C. After shutdown, the device remains off until the junction cools by approximately +15°C, then resumes regulation. This hysteresis prevents oscillation near the trip point. The GND pin serves as both electrical ground and thermal conduction path - effective PCB layout with a large copper pour is essential for reliable thermal performance in the MAX8868EUK33-T.
Can the MAX8868EUK33-T operate with input voltages below 3.3V?
No, the MAX8868EUK33-T cannot regulate at input voltages below its output voltage plus dropout. With a 3.3V output and 165mV typical dropout at 150mA, the minimum functional input is ~3.465V. At lower inputs, the device enters dropout mode and VOUT drops linearly with VIN. For applications requiring operation down to 2.5V input, the MAX8868EUK33-T is unsuitable - consider adjustable LDOs or lower-VOUT fixed variants instead.
MAX8868EUK33-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.165V @ 150mA (Typ)
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- 63dB (10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX8868EUK33-T FAQ
1.How can I place an order for MAX8868EUK33-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8868EUK33-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 MAX8868EUK33-T reliable?
The price and inventory of MAX8868EUK33-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8868EUK33-T is usually 5 days.
3.What payment methods are accepted for MAX8868EUK33-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8868EUK33-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8868EUK33-T?
MAX8868EUK33-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8868EUK33-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 MAX8868EUK33-T?
For technical support, including MAX8868EUK33-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8868EUK33-T requirements.
6.How does Aetrix verify that MAX8868EUK33-T is sourced from the original manufacturer or authorized distributors?
All MAX8868EUK33-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 MAX8868EUK33-T meets industry standards.
7.What is the process for return or replacement of MAX8868EUK33-T?
All MAX8868EUK33-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8868EUK33-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 MAX8868EUK33-T part is unused and in its original packaging.
Return procedure for MAX8868EUK33-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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