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Analog Devices Inc./Maxim Integrated MAX8868EUK28+T
- Part No.:
- MAX8868EUK28+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8868EUK28+T.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,347
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Product details
Overview
MAX8868EUK28+T from Maxim Integrated is a low-noise, low-dropout linear regulator with 2.8V 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 space-constrained portable electronics requiring stable, clean power from single-cell Li-ion or alkaline sources.
For engineers reviewing the MAX8868EUK28+T datasheet, MAX8868EUK28+T pinout, MAX8868EUK28+T application, or MAX8868EUK28+T equivalent, key selection criteria include its 2.8V fixed output accuracy (±1.4%), 10nA shutdown current, SOT23-5 package footprint, thermal/short-circuit protection, and BP-pin noise-filtering architecture.
Technical Context
The MAX8868EUK28+T uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling ultra-low quiescent current (100µA across load and dropout conditions) and eliminating base-drive losses inherent in PNP-based LDOs. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to OUT.
Unlike the MAX8867, the MAX8868EUK28+T integrates active auto-discharge via SHDN assertion - pulling OUT to GND through an internal switch - and includes dedicated BP pin filtering (0.01µF ceramic) that forms an 80Hz low-pass filter with internal 200kΩ resistance to suppress reference noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±1.4% (factory-preset; no external resistors required) |
| Max Output Current | 150mA continuous; supports peak loads without thermal shutdown under proper PCB layout |
| Dropout Voltage | 165mV at 150mA (enables operation down to ~2.965V input with 2.8V output) |
| Output Noise | 30µVRMS (10Hz–100kHz; enables powering noise-sensitive analog/RF circuitry) |
| Quiescent Current | 100µA operating (load-independent); drops to 10nA in logic-controlled shutdown |
| Shutdown Discharge | Active discharge path to GND (MAX8868-specific; prevents floating outputs in battery-powered sleep modes) |
| Input Voltage Range | 2.5V to 6.5V (supports single-cell Li-ion, NiMH, alkaline, and regulated DC rails) |
Pinout & Package
SOT23-5 regular package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, GND pin serves as thermal pad - requires soldering to large copper area for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low enable/discharge control | Logic low (≤0.4V) disables regulator and activates auto-discharge; tie to IN for always-on operation |
| 2 - GND | Power ground & thermal sink | Must connect to PCB ground plane with ≥25mm² copper for thermal dissipation; carries ground return current |
| 3 - IN | Input voltage supply | Accepts 2.5V–6.5V; requires 1µF bypass capacitor to GND near pin for stability and noise rejection |
| 4 - OUT | Regulated output | Delivers 2.8V up to 150mA; requires 1–10µF low-ESR output capacitor (X7R/X5R ceramic preferred) |
| 5 - BP | Noise-reduction bypass | Connects to 0.01µF ceramic capacitor to reduce reference noise; determines startup time and noise floor |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge on shutdown | Active pull-down of OUT to GND via internal switch - eliminates residual voltage during system sleep, critical for low-power sequencing |
| Reverse battery protection | Limits reverse current to ≤1mA if VIN or SHDN falls below GND - prevents damage in misinserted battery scenarios |
| Thermal & short-circuit protection | Shuts down at +170°C junction temp; restarts after 20°C cooldown - enables robust operation in sealed enclosures |
| P-channel MOSFET pass element | 1.1Ω RDS(ON) enables 100µA IQ independent of load/dropout - extends battery life vs. bipolar LDOs |
| BP-pin noise filtering | Internal 200kΩ resistor + external 0.01µF forms 80Hz LPF - reduces reference noise contribution to total output noise |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
Use Scenario: Powering RF transceiver bias circuits and baseband analog sections in GSM/CDMA handsets. IC Role / Device Role / Timing Role: Primary 2.8V LDO supplying noise-sensitive VCOs, PLLs, and ADC front-ends. Use Value: 30µVRMS noise ensures <0.1° phase jitter degradation in local oscillator paths; auto-discharge prevents leakage into powered-down RF blocks. | Use Scenario: Providing regulated 2.8V supply to PCMCIA card controller ICs and flash memory interfaces. IC Role / Device Role / Timing Role: Standby-mode LDO maintaining clean voltage during card insertion/ejection sequences. Use Value: 10nA shutdown current minimizes battery drain during host sleep; reverse battery protection safeguards against hot-swap polarity errors. |
| Palmtop Computers | Hand-Held Instruments |
Use Scenario: Supplying microcontroller core voltage and LCD driver circuitry in battery-operated PDAs. IC Role / Device Role / Timing Role: Main system LDO delivering stable 2.8V to mixed-signal SoC and display subsystems. Use Value: 165mV dropout allows >20% longer runtime from single-cell Li-ion (down to 2.965V cutoff); thermal protection prevents overheating during CPU burst loads. | Use Scenario: Powering precision analog front-ends (op-amps, sensors, ADCs) in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Low-noise analog rail generator isolating sensitive measurement circuitry from digital switching noise. Use Value: BP-filtered 30µVRMS noise meets <100µVpp analog supply spec for 16-bit ADCs; 1.4% output accuracy maintains calibration integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76328DBVR | 2.8V fixed, 150mA, 120mV dropout at 150mA, 35µVRMS noise, no auto-discharge, SOT23-5 | Lacks active output discharge; higher dropout improves efficiency margin but reduces usable battery range | Select when auto-discharge is unnecessary and lower dropout is prioritized over noise performance |
| MCP1700T-2802E/TT | 2.8V fixed, 250mA, 178mV dropout at 250mA, 30µVRMS noise, no BP pin, SOT23-5 | Higher current rating but no BP noise filtering or reverse battery protection; lacks shutdown discharge | Choose for cost-sensitive designs needing >150mA headroom where noise filtering is handled externally |
Compared with TPS76328DBVR and MCP1700T-2802E/TT, the MAX8868EUK28+T uniquely combines ultra-low noise (30µVRMS), auto-discharge, reverse battery protection, and BP-pin optimization - making it optimal for battery-powered systems demanding both signal integrity and robust fault handling in minimal area.
Availability
MAX8868EUK28+T is available at Aetrix Electronics and suitable for cellular handsets, palmtop computers, PCMCIA cards, and hand-held instruments requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX8868EUK28+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 high-performance analog, mixed-signal, and power-management ICs for demanding industrial, communications, and consumer applications.
The MAX8867/MAX8868 product line targets battery-powered portable electronics requiring ultra-low noise, low quiescent current, and integrated protection - optimized for compact SOT23-5 layouts with minimal external components.
FAQ
What is the output voltage tolerance of the MAX8868EUK28+T?
The MAX8868EUK28+T has a factory-preset output voltage of 2.8V with guaranteed accuracy of ±1.4% over -40°C to +85°C temperature range and full load conditions. This specification is confirmed in the Electrical Characteristics table of the official datasheet and applies directly to the MAX8868EUK28+T variant.
Does the MAX8868EUK28+T require external resistors to set the output voltage?
No, the MAX8868EUK28+T does not require external resistors. Its 2.8V output is internally preset using a precision resistor divider; the device is a fixed-output LDO. The "28" in the part number explicitly denotes the 2.8V output code per Maxim's Expanded Ordering Information table.
How does the auto-discharge function work on the MAX8868EUK28+T?
When the SHDN pin is driven low, the MAX8868EUK28+T activates an internal discharge switch between OUT and GND, actively pulling the output voltage to ground. This behavior is exclusive to the MAX8868 family (not MAX8867) and is confirmed in the General Description, Pin Description, and Functional Diagram sections of the datasheet.
What capacitor values are recommended for the BP pin on the MAX8868EUK28+T?
The MAX8868EUK28+T requires a 0.01µF ceramic capacitor between BP and GND for optimal noise performance. Values above 0.1µF increase startup time without improving noise; values below 0.01µF degrade noise reduction. This recommendation is specified in the Applications Information section and validated in the Typical Operating Characteristics graphs.
Is the MAX8868EUK28+T pin-compatible with other regulators in the same family?
Yes, the MAX8868EUK28+T is pin-compatible with the MAX8867EUK28+T and shares the same SOT23-5 pinout. It is also pin-compatible with MAX8863/MAX8864 except for the BP pin function - a detail explicitly stated in the General Description and confirmed in the Pin Configuration diagram.
MAX8868EUK28+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 2.8V
- 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
MAX8868EUK28+T FAQ
1.How can I place an order for MAX8868EUK28+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8868EUK28+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 MAX8868EUK28+T reliable?
The price and inventory of MAX8868EUK28+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8868EUK28+T is usually 5 days.
3.What payment methods are accepted for MAX8868EUK28+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8868EUK28+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8868EUK28+T?
MAX8868EUK28+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8868EUK28+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 MAX8868EUK28+T?
For technical support, including MAX8868EUK28+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8868EUK28+T requirements.
6.How does Aetrix verify that MAX8868EUK28+T is sourced from the original manufacturer or authorized distributors?
All MAX8868EUK28+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 MAX8868EUK28+T meets industry standards.
7.What is the process for return or replacement of MAX8868EUK28+T?
All MAX8868EUK28+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8868EUK28+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 MAX8868EUK28+T part is unused and in its original packaging.
Return procedure for MAX8868EUK28+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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