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Analog Devices Inc./Maxim Integrated MAX8868EUK50+T
- Part No.:
- MAX8868EUK50+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8868EUK50+T.pdf
- Description:
- IC REG LINEAR 5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,400
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Product details
Overview
MAX8868EUK50+T from Maxim Integrated is a low-noise, low-dropout linear regulator with fixed 5.0V output, 150mA output current capability, 30µVRMS output noise, and 165mV dropout at full load - designed for battery-powered portable electronics requiring stable, clean power under light-to-moderate load conditions.
For engineers reviewing the MAX8868EUK50+T datasheet, MAX8868EUK50+T pinout, MAX8868EUK50+T application, or MAX8868EUK50+T equivalent, key selection criteria include its auto-discharge function, reverse battery protection, 10nA shutdown current, SOT23-5 package compatibility, and ±1.4% output voltage accuracy across -40°C to +85°C.
Technical Context
The MAX8868EUK50+T 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 common in PNP-based LDOs. 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 MAX8868EUK50+T integrates an active auto-discharge circuit that pulls the output to GND during SHDN assertion via a dedicated discharge path - confirmed by functional diagram and shutdown timing curves. It also includes thermal shutdown (155°C trip, 20°C hysteresis), short-circuit protection, and reverse-battery protection limiting reverse current to ≤1mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.4% over -40°C to +85°C - ensures stable logic supply for 5V microcontrollers and peripherals without external feedback. |
| Max Output Current | 150mA continuous - supports moderate-power RF modules, LCD bias circuits, and sensor signal chains in handheld devices. |
| Dropout Voltage | 165mV at 150mA - enables operation down to VIN = 5.165V, extending usable battery life in single-cell Li-ion or 3×AA configurations. |
| Output Noise | 30µVRMS (10Hz–100kHz, CBP = 0.01µF, COUT = 10µF) - meets low-noise requirements for ADC references and RF front-end biasing. |
| Shutdown Current | 10nA - reduces system standby power to negligible levels in sleep-mode applications like cellular handsets and palmtop computers. |
| Auto-Discharge | Active discharge to GND when SHDN = low - eliminates residual output voltage that could cause latch-up or leakage in downstream circuitry. |
| Input Voltage Range | 2.5V to 6.5V - accommodates wide input sources including Li-ion (2.7–4.2V), Li-poly, and regulated 5V rails. |
Pinout & Package
SOT23-5 regular package (5-pin, 1.6mm × 2.9mm × 1.1mm body height), thermally enhanced with GND pin serving as heatsink - requires soldering to large copper area for thermal management per θJB = 140°C/W specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low shutdown control | Logic-low input disables regulator and triggers auto-discharge on MAX8868EUK50+T; connect to IN for always-on operation. |
| 2 - GND | Ground reference and thermal path | Electrical return and primary heat dissipation path - must be connected to PCB ground plane for safe 150mA operation. |
| 3 - IN | Input voltage supply | Accepts 2.5V–6.5V input; bypass with ≥1µF ceramic capacitor to suppress supply noise and ensure stability. |
| 4 - OUT | Regulated output | Delivers fixed 5.0V up to 150mA; requires ≥1µF output capacitor (X7R/X5R dielectric recommended) for transient response and stability. |
| 5 - BP | Noise-reduction bypass | Connects to 0.01µF ceramic capacitor to reduce output noise via internal 200kΩ filter - critical for achieving 30µVRMS performance. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Actively pulls OUT to GND during shutdown - prevents floating outputs and unintended biasing of downstream ICs in portable systems. |
| Reverse battery protection | Limits reverse current to ≤1mA when VIN or SHDN falls below GND - protects device and system during incorrect battery insertion. |
| Thermal shutdown with hysteresis | Trips at 155°C (±5°C), re-enables after 20°C cooldown - provides fault-safe operation without latch-up during sustained overload. |
| P-channel MOSFET pass element | 1.1Ω typical RDS(ON) - enables constant 100µA quiescent current regardless of load or dropout condition, maximizing battery runtime. |
| Low-noise BP filtering | Internal 200kΩ resistor + external 0.01µF BP cap forms 80Hz low-pass filter - reduces high-frequency noise contribution from reference and error amplifier. |
Applications
| Cellular Telephones | PCMCIA Cards |
|---|---|
Use Scenario: Powering RF transceiver bias rails and baseband processor I/O supplies in GSM/CDMA handsets with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Low-noise 5.0V LDO delivering clean, stable voltage to sensitive analog sections while maintaining minimal quiescent draw during idle states. Use Value: 30µVRMS noise and 10nA shutdown current directly improve receiver sensitivity and extend talk/standby time beyond competing LDOs. | Use Scenario: Providing regulated 5.0V supply to PCMCIA card controllers and interface logic in laptop expansion slots. IC Role / Device Role / Timing Role: Fixed-output LDO with reverse battery protection and fast load-transient response for hot-plug compatible peripheral power. Use Value: Reverse-battery protection prevents damage during card insertion/removal errors; 12mV load-step response (0–50mA) ensures stable interface signaling. |
| Palmtop Computers | Hand-Held Instruments |
Use Scenario: Supplying core logic and display driver voltage in compact PDAs with tight thermal constraints and multi-voltage rail architectures. IC Role / Device Role / Timing Role: Thermally efficient 5.0V regulator using GND pin as heatsink, supporting 150mA peak loads during screen refresh or data transfer. Use Value: SOT23-5 footprint and 140°C/W θJB allow integration into space-constrained layouts without external thermal vias or heatsinks. | Use Scenario: Powering precision analog front-ends (e.g., op-amps, ADCs) and microcontroller cores in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Ultra-low-noise, high-accuracy LDO ensuring stable reference and signal-chain biasing independent of battery voltage sag. Use Value: ±1.4% output accuracy and 30µVRMS noise preserve measurement integrity across temperature and load variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, 5V LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8867EUK50+T | No auto-discharge; identical pinout, specs, and package - differs only in absence of BP-triggered discharge path. | Suitable where output hold-up during shutdown is acceptable or required; lacks active discharge for safety-critical reset sequencing. | Select MAX8867EUK50+T only if auto-discharge is unnecessary and cost minimization is prioritized. |
| MCP1700T-5002E/TT | Higher 175mV dropout at 250mA, 65µVRMS noise, no reverse-battery protection, 1.6µA quiescent current - different architecture (NPN-based). | Lower cost alternative for non-battery-reverse-prone designs with relaxed noise and dropout requirements. | Choose MCP1700T-5002E/TT only for cost-sensitive, non-portable applications where 30µVRMS noise and reverse protection are not mandatory. |
Compared with MAX8867EUK50+T, the MAX8868EUK50+T adds verified auto-discharge functionality without sacrificing noise, accuracy, or thermal performance; versus MCP1700T-5002E/TT, it delivers superior noise, reverse protection, and true 10nA shutdown - making it the optimal choice for battery-powered portable instrumentation and communications equipment.
Availability
MAX8868EUK50+T is available at Aetrix Electronics and suitable for cellular telephones, palmtop computers, and hand-held instruments requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX8868EUK50+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 U.S.-based 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 requiring ultra-low noise, low quiescent current, and robust protection features - targeting cellular handsets, modems, and handheld instrumentation.
FAQ
What is the output voltage tolerance of the MAX8868EUK50+T over temperature and load?
The MAX8868EUK50+T guarantees ±1.4% output voltage accuracy over the full operating temperature range (-40°C to +85°C) and load current (0–150mA), as confirmed in the Electrical Characteristics table. This tolerance includes initial accuracy, line regulation (±0.15%/V), and load regulation (±0.04%/mA), ensuring stable 5.0V operation across real-world battery voltage sag and dynamic load changes. The MAX8868EUK50+T achieves this via a trimmed 1.25V bandgap reference and precision internal feedback divider.
Does the MAX8868EUK50+T require an external BP capacitor, and what happens if it's omitted?
Yes, the MAX8868EUK50+T requires a 0.01µF ceramic capacitor between BP and GND to achieve its specified 30µVRMS output noise. Omitting the BP capacitor increases output noise to approximately 50–60µVRMS, degrades PSRR above 1kHz, and may cause instability under certain load/transient conditions. The internal 200kΩ resistor and external capacitor form an 80Hz low-pass filter for the reference node - skipping this component compromises the low-noise design intent and violates the recommended operating circuit.
How does the auto-discharge function of the MAX8868EUK50+T operate, and what is its discharge resistance?
The MAX8868EUK50+T auto-discharge function activates when SHDN is pulled low, connecting the OUT pin to GND through an internal ~300Ω discharge path (specified as 150–390Ω in datasheet). This actively pulls the output voltage to ground within microseconds, preventing residual voltage from powering downstream circuitry or causing latch-up. Unlike passive discharge via load, this feature ensures deterministic, rapid discharge even with no external load - critical for safe power sequencing in portable systems. The MAX8868EUK50+T datasheet confirms this behavior in Figure 1 (functional diagram) and shutdown timing curves.
Can the MAX8868EUK50+T be used with ceramic output capacitors, and what ESR range is supported?
Yes, the MAX8868EUK50+T is fully compatible with low-ESR ceramic output capacitors (X7R/X5R dielectrics), with a recommended value of 1µF minimum. Stability is maintained for ESR values from 0.01Ω to 0.2Ω across 1–150mA load range, as shown in the "Region of Stable COUT ESR vs. Load Current" graph. Z5U/Y5V ceramics are discouraged due to capacitance drift at low temperatures; for those, ≥2.2µF is advised. Tantalum capacitors require ≥2.2µF to stay within the stable ESR region. The MAX8868EUK50+T does not require series ESR for stability - unlike older LDO architectures.
What protection features are integrated into the MAX8868EUK50+T, and how are they implemented?
The MAX8868EUK50+T integrates four key protections: (1) Thermal shutdown trips at 155°C with 20°C hysteresis, disabling the pass transistor until junction cools; (2) Short-circuit protection limits output current to ≥160mA minimum, allowing indefinite grounding of OUT; (3) Reverse battery protection uses internal circuitry to disconnect parasitic paths when VIN or SHDN falls below GND, limiting reverse current to ≤1mA; (4) Output current limit (390mA typical) is enforced via gate-voltage control of the P-channel MOSFET. All functions are implemented in silicon with no external components required - confirmed in the Detailed Description and Absolute Maximum Ratings sections.
MAX8868EUK50+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):
- 5V
- 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
MAX8868EUK50+T FAQ
1.How can I place an order for MAX8868EUK50+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8868EUK50+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 MAX8868EUK50+T reliable?
The price and inventory of MAX8868EUK50+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8868EUK50+T is usually 5 days.
3.What payment methods are accepted for MAX8868EUK50+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8868EUK50+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8868EUK50+T?
MAX8868EUK50+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8868EUK50+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 MAX8868EUK50+T?
For technical support, including MAX8868EUK50+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8868EUK50+T requirements.
6.How does Aetrix verify that MAX8868EUK50+T is sourced from the original manufacturer or authorized distributors?
All MAX8868EUK50+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 MAX8868EUK50+T meets industry standards.
7.What is the process for return or replacement of MAX8868EUK50+T?
All MAX8868EUK50+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8868EUK50+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 MAX8868EUK50+T part is unused and in its original packaging.
Return procedure for MAX8868EUK50+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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