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Analog Devices Inc./Maxim Integrated MAX8868EUK33
- Part No.:
- MAX8868EUK33
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8868EUK33.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:2,162
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Product details
Overview
MAX8868EUK33 from Maxim Integrated is a low-noise, low-dropout linear regulator with 3.3V preset output, 150mA output current capability, 30µVRMS output noise, and 165mV dropout at full load. It features auto-discharge on shutdown, reverse battery protection, and operates from 2.5V to 6.5V input - ideal for powering RF sections and precision analog circuitry in portable battery-powered devices.
For engineers reviewing the MAX8868EUK33 datasheet, MAX8868EUK33 pinout, MAX8868EUK33 application, or MAX8868EUK33 equivalent, key selection criteria include its 10nA shutdown current, BP-pin noise filtering architecture, thermal/short-circuit protection, and SOT23-5 thin-package compatibility with space-constrained handheld designs.
Technical Context
The MAX8868EUK33 uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling ultra-low quiescent current (100µA across all load and dropout conditions) and eliminating base-drive losses inherent in PNP-based regulators. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin.
Unlike the MAX8867, the MAX8868EUK33 integrates active auto-discharge via internal NMOS between OUT and GND during SHDN assertion, reducing output voltage to ground within microseconds. The BP pin connects to an internal 200kΩ resistor forming an 80Hz low-pass filter with an external 0.01µF capacitor to suppress reference noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±1.4% - factory-preset, eliminates external feedback resistors and layout sensitivity. |
| Max Output Current | 150mA - sufficient for powering microcontrollers, sensors, and RF ICs without thermal derating in SOT23-5. |
| Dropout Voltage | 165mV at 150mA - enables operation down to 3.465V input when regulating 3.3V, extending battery life in single-cell Li-ion systems. |
| Output Noise | 30µVRMS (10Hz–100kHz) - achieved via BP pin filtering; critical for noise-sensitive ADCs, PLLs, and VCOs. |
| Quiescent Current | 100µA (operating), 10nA (shutdown) - maintains efficiency across light-load and standby modes in always-on subsystems. |
| Protection Features | Thermal shutdown (155°C), short-circuit limit (≥160mA), reverse battery protection (<1mA reverse current) - ensures robustness in unattended portable deployments. |
| Input Voltage Range | 2.5V to 6.5V - supports single-cell Li-ion (2.7–4.2V), dual-cell alkaline (2.4–3.2V), and 5V rail inputs. |
Pinout & Package
SOT23-5 regular package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, exposed pad not present. GND pin serves dual role as electrical return and thermal path - requires soldering to ≥25mm² copper area for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low enable control | Pulls supply current to 10nA; on MAX8868EUK33, also activates NMOS discharge path from OUT to GND. |
| 2 - GND | Power ground and thermal sink | Reference for all internal circuitry; must be connected to large PCB copper area to maintain TJ ≤ +150°C at 150mA. |
| 3 - IN | Unregulated input supply | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass to GND close to pin for stability and line-transient immunity. |
| 4 - OUT | Regulated 3.3V output | Sources up to 150mA; requires ≥1µF low-ESR ceramic capacitor to GND; BP-filtering reduces noise propagation. |
| 5 - BP | Bandgap reference bypass | Connects to internal 200kΩ resistor; 0.01µF ceramic capacitor here reduces output noise by filtering reference voltage ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge on shutdown | Active NMOS discharges OUT to GND in <10µs - prevents floating outputs and unintended wake-up in multi-rail systems. |
| Reverse battery protection | Limits reverse current to <1mA when VIN or SHDN falls below GND - protects device and system during incorrect battery insertion. |
| Stable with low-ESR ceramics | Operates stably with 1µF X7R/X5R capacitors (ESR <0.2Ω) - eliminates need for tantalum or electrolytic output caps. |
| Ultra-low dropout architecture | P-channel MOSFET pass element avoids saturation losses - maintains 100µA IQ even in dropout, unlike PNP regulators. |
| Integrated current limiting | Guarantees ≥160mA minimum current limit - allows safe short-circuit testing and prevents damage during board bring-up. |
Applications
| Cellular RF Front-End Power | Portable Medical Sensor Bias |
|---|---|
Use Scenario: Powering GSM/UMTS PA bias rails and LNA supplies in compact cellular handsets where EMI and noise coupling are critical. IC Role / Device Role / Timing Role: Low-noise 3.3V local regulator providing clean bias to RF amplifiers and mixers, decoupled from noisy digital supply domains. Use Value: 30µVRMS noise and 63dB PSRR at 1kHz prevent AM-to-PM distortion and phase noise degradation in transmit paths. | Use Scenario: Supplying precision analog front-ends (AFE) in handheld ECG or pulse oximetry units operating from coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Stable 3.3V reference-grade supply for 24-bit delta-sigma ADCs and instrumentation amplifiers requiring sub-µV noise floor. Use Value: Auto-discharge ensures rapid power-down of analog signal chain during sleep mode, reducing leakage-induced baseline drift. |
| Industrial Handheld Terminal Logic Rail | Wearable BLE SoC Core Supply |
Use Scenario: Delivering regulated 3.3V to ARM Cortex-M microcontrollers and touch controllers in ruggedized warehouse scanners. IC Role / Device Role / Timing Role: Primary logic rail regulator with reverse battery protection guarding against field-replaceable battery misinsertion. Use Value: 10nA shutdown current extends shelf life and runtime in intermittent-scan applications; thermal shutdown prevents latch-up during extended barcode reading. | Use Scenario: Powering Nordic nRF52/nRF53 series Bluetooth LE SoCs in fitness trackers where size and battery longevity are paramount. IC Role / Device Role / Timing Role: Compact, low-IQ 3.3V supply enabling deep-sleep currents <1µA while maintaining fast wake-up (<300µs exit delay). Use Value: SOT23-5 footprint and 100µA operating IQ minimize PCB area and extend CR2032 battery life beyond 12 months in typical usage. |
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 |
|---|---|---|---|
| TPS78233DRVT | Lower IQ (500nA shutdown), higher dropout (200mV @150mA), no auto-discharge, 2% accuracy | Lacks active output discharge; less suitable for systems requiring rapid rail collapse during shutdown | Select when ultra-low shutdown current outweighs need for auto-discharge and tighter output tolerance |
| MCP1700T-3302E/TT | Higher noise (95µVRMS), no BP pin, no reverse battery protection, 2% accuracy, 250mA rating | Missing reverse polarity and noise-reduction features; requires external discharge circuitry for safe shutdown | Choose for cost-sensitive, non-battery-reversal environments where noise is secondary to budget |
Compared with TPS78233DRVT and MCP1700T-3302E/TT, the MAX8868EUK33 uniquely combines 30µVRMS noise, 10nA shutdown, and integrated auto-discharge - making it optimal for high-fidelity analog and fast-wake-up portable systems where output rail control is mandatory.
Availability
MAX8868EUK33 is available at Aetrix Electronics and suitable for cellular telephones, handheld medical instruments, industrial barcode scanners, and wearable BLE devices requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX8868EUK33 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, automotive, and communications applications.
The MAX8867/MAX8868 product line targets battery-powered portable electronics requiring ultra-low noise, low dropout, and robust protection - delivering regulated 2.5V–5.0V outputs in space-constrained SOT23 packages.
FAQ
What is the exact output voltage tolerance of the MAX8868EUK33?
The MAX8868EUK33 has a factory-preset output voltage of 3.3V with ±1.4% accuracy over the full temperature range (-40°C to +85°C) and load conditions (0–150mA). This specification is 100% production tested at +25°C and guaranteed across temperature via Statistical Quality Control correlation.
Does the MAX8868EUK33 require an external BP capacitor for stable operation?
Yes - the MAX8868EUK33 requires a 0.01µF ceramic capacitor between the BP pin and GND to achieve its specified 30µVRMS output noise. Omitting this capacitor increases noise significantly; using >0.1µF raises startup time without improving noise performance and is not recommended.
How does the auto-discharge function work in the MAX8868EUK33 during shutdown?
When the SHDN pin is pulled low, the MAX8868EUK33 activates an internal NMOS transistor between the OUT and GND pins, actively discharging the output capacitor to ground. This occurs within microseconds and ensures the 3.3V rail collapses fully - preventing unintended operation of downstream circuitry during sleep mode.
Can the MAX8868EUK33 operate with a 2.5V input while regulating 3.3V output?
No - the MAX8868EUK33 cannot regulate 3.3V output from a 2.5V input because the minimum input voltage must exceed the output voltage by the dropout voltage. At 150mA, dropout is 165mV, so minimum valid input is 3.465V. Operation below that causes unregulated output collapse.
Is the MAX8868EUK33 pin-compatible with the MAX8867EUK33?
Yes - the MAX8868EUK33 is pin-compatible with the MAX8867EUK33 in the same SOT23-5 package. The only functional difference is the presence of auto-discharge on the MAX8868EUK33; all other pins (IN, OUT, GND, SHDN, BP) have identical functions and electrical behavior.
MAX8868EUK33 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 FAQ
1.How can I place an order for MAX8868EUK33 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8868EUK33 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 reliable?
The price and inventory of MAX8868EUK33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8868EUK33 is usually 5 days.
3.What payment methods are accepted for MAX8868EUK33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8868EUK33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8868EUK33?
MAX8868EUK33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8868EUK33 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?
For technical support, including MAX8868EUK33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8868EUK33 requirements.
6.How does Aetrix verify that MAX8868EUK33 is sourced from the original manufacturer or authorized distributors?
All MAX8868EUK33 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 meets industry standards.
7.What is the process for return or replacement of MAX8868EUK33?
All MAX8868EUK33 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8868EUK33, 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 part is unused and in its original packaging.
Return procedure for MAX8868EUK33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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