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Analog Devices Inc./Maxim Integrated MAX8868EUK48-T
- Part No.:
- MAX8868EUK48-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8868EUK48-T.pdf
- Description:
- IC REG LINEAR LOW NOISE LDO
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
MAX8868EUK48-T from Maxim Integrated is a low-noise, low-dropout linear regulator with 4.8V preset 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.
For engineers reviewing the MAX8868EUK48-T datasheet, MAX8868EUK48-T pinout, MAX8868EUK48-T application, or MAX8868EUK48-T equivalent, key selection criteria include auto-discharge functionality, reverse battery protection, thermal shutdown behavior, BP-capacitor–dependent noise performance, and SOT23-5 package compatibility with PCB layout constraints in space-constrained handheld designs.
Technical Context
The MAX8868EUK48-T integrates an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling ultra-low quiescent current (100µA) across all operating conditions - including dropout - and eliminating base-drive losses common 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 MAX8868EUK48-T includes dedicated auto-discharge circuitry activated during SHDN assertion, actively pulling the output to GND via an internal NMOS switch. It also features reverse battery protection limiting reverse current to ≤1mA when VIN or SHDN falls below GND, plus thermal shutdown at +155°C with +15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.8V ±1.4% - factory-preset, eliminates external feedback resistors and reduces BOM count. |
| Max Output Current | 150mA - supports moderate-power RF modules, LCD bias, or sensor signal chains without thermal derating in SOT23-5. |
| Dropout Voltage | 165mV at 150mA - enables operation down to ~4.965V input when regulating 4.8V, extending usable battery life in single-cell Li-ion systems. |
| Output Noise | 30µVRMS (10Hz–100kHz) - achieved with 0.01µF BP capacitor; critical for noise-sensitive analog circuits like ADC references or RF synthesizers. |
| Quiescent Current | 100µA (operating), 10nA (shutdown) - maintains battery runtime in always-on monitoring modes and enables rapid wake-up from deep sleep. |
| Shutdown Discharge | Active NMOS discharge path - pulls VOUT to GND within microseconds upon SHDN assertion, preventing floating outputs or unintended device wake-up. |
| Input Voltage Range | 2.5V to 6.5V - compatible with Li-ion (2.7–4.2V), Li-Poly, and dual-AA/AAA configurations with headroom for voltage spikes. |
Pinout & Package
SOT23-5 regular package (JEDEC MO-178AA), 2.9mm × 1.6mm footprint, 1.1mm height; GND pin serves as primary thermal path - requires direct connection to large copper pour for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low enable/discharge control | Logic-low (<0.4V) enables shutdown mode and triggers auto-discharge on MAX8868EUK48-T; connect to IN for always-on operation. |
| 2 - GND | Power ground and thermal sink | Electrical return path and primary heat dissipation node - must be soldered to ≥100mm² copper area for reliable 150mA operation at +85°C. |
| 3 - IN | Regulator input supply | Accepts 2.5–6.5V; requires ≥1µF ceramic bypass to GND close to pin to suppress line transients and ensure stability. |
| 4 - OUT | Regulated output | Delivers up to 150mA at 4.8V; requires ≥1µF low-ESR ceramic capacitor to GND; sensitive to ESR/temperature drift of output cap. |
| 5 - BP | Noise-reduction bypass terminal | Connects internally to 200kΩ resistor forming 80Hz LPF; 0.01µF ceramic cap reduces output noise to 30µVRMS; values >0.1µF increase startup time without benefit. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Active NMOS discharge path pulls VOUT to GND in <10µs upon SHDN assertion - prevents residual voltage from powering downstream logic or causing latch-up. |
| Reverse battery protection | Blocks reverse current to ≤1mA when VIN or SHDN < 0V - protects IC and system during incorrect battery insertion in consumer handhelds. |
| Thermal shutdown with hysteresis | Shuts down at +155°C junction temperature; restarts after cooling by +15°C - prevents thermal runaway while allowing pulsed operation under sustained overload. |
| P-channel MOSFET pass element | 1.1Ω typical RDS(ON) eliminates base-drive current - ensures 100µA IQ remains constant across load, input, and dropout conditions. |
| Low-noise BP filtering | Internal 200kΩ resistor + external 0.01µF BP cap forms 80Hz filter - reduces broadband noise without requiring complex external compensation networks. |
Applications
| Cellular Handset Power Rail | PCMCIA Card LDO Supply |
|---|---|
Use Scenario: Providing clean 4.8V bias to RF front-end ICs and baseband processors in GSM/EDGE handsets during burst transmission. IC Role / Device Role / Timing Role: Primary LDO supplying noise-sensitive analog sections; regulates directly from single-cell Li-ion with minimal headroom. Use Value: 30µVRMS noise and 63dB PSRR at 1kHz prevent AM modulation of transmit carriers; auto-discharge ensures fast power-down between call slots. |
Use Scenario: Delivering regulated 4.8V to PCMCIA Type II card logic and interface circuitry during hot-insertion and dynamic voltage scaling. IC Role / Device Role / Timing Role: Standby/active-mode LDO with fast transient response and reverse polarity immunity during card swap. Use Value: Reverse battery protection prevents damage during misaligned insertion; 12mV load transient (0→50mA) meets PCMCIA spec for supply stability. |
| Palmtop Computer Core Logic | Electronic Planner Audio Codec Bias |
Use Scenario: Powering ARM7-based application processor core and SRAM in palmtop PDAs with aggressive power cycling. IC Role / Device Role / Timing Role: Main system LDO with programmable enable and controlled discharge to eliminate leakage paths during suspend-to-RAM. Use Value: 10nA shutdown current extends standby time to weeks; 100µA operating IQ minimizes idle power without sacrificing regulation accuracy. |
Use Scenario: Supplying low-noise 4.8V to sigma-delta audio DAC and headphone amplifier in voice-enabled planners. IC Role / Device Role / Timing Role: Analog-domain LDO decoupling digital switching noise from sensitive audio signal chain. Use Value: 30µVRMS noise floor ensures >90dB SNR in 24-bit audio playback; BP capacitor tuning allows optimization for specific codec EMI requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8867EUK48-T | Lacks auto-discharge; identical pinout, specs, and package - same footprint but no active output discharge. | Suitable where output discharge is handled externally or unnecessary (e.g., non-critical power domains). | Select when cost sensitivity outweighs need for integrated discharge; verify external pull-down sufficiency for system reset timing. |
| Torex XC6206P482MR | Higher 250mV dropout at 150mA; 40µVRMS noise; no reverse battery or thermal shutdown; SOT23-5 pin-compatible. | Targeted at cost-optimized industrial sensors where protection features are omitted. | Choose only if thermal/reverse protection is implemented at board level; confirm 250mV dropout meets minimum input voltage margin. |
Compared with MAX8867EUK48-T and XC6206P482MR, the MAX8868EUK48-T uniquely combines auto-discharge, reverse battery protection, and thermal shutdown in a pin-compatible SOT23-5 package - delivering higher system-level reliability without layout changes, while maintaining best-in-class noise and quiescent current.
Availability
MAX8868EUK48-T is available at Aetrix Electronics and suitable for cellular telephones, PCMCIA cards, palmtop computers, and electronic planners requiring stable component supply with guaranteed long-term sourcing and full traceability.
Supply support for MAX8868EUK48-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 engineered specifically for battery-powered portable electronics - prioritizing ultra-low noise, minimal quiescent current, and robust fault protection in sub-3mm footprints.
FAQ
What output voltage does the MAX8868EUK48-T deliver, and how is it set?
The MAX8868EUK48-T delivers a factory-preset 4.8V output with ±1.4% accuracy over temperature and load. This voltage is fixed internally using a precision resistor divider - no external components are required. The "48" in the part number explicitly denotes the 4.8V output code per Maxim's ordering convention, confirmed in the Expanded Ordering Information table.
Does the MAX8868EUK48-T provide reverse battery protection, and how does it work?
Yes, the MAX8868EUK48-T includes reverse battery protection that limits reverse current to ≤1mA when VIN or SHDN falls below ground. Internal circuitry monitors pin polarity and disconnects parasitic paths, preventing damage during incorrect battery installation - a critical feature validated in the Absolute Maximum Ratings and Detailed Description sections.
How does the auto-discharge function operate in the MAX8868EUK48-T?
When SHDN is pulled low, the MAX8868EUK48-T activates an internal NMOS transistor between OUT and GND, actively discharging the output capacitor to ground. This occurs within microseconds and is exclusive to the MAX8868 family - the MAX8867EUK48-T lacks this function. The discharge resistance is specified as 300Ω in the Electrical Characteristics table.
What capacitor values are required for stable operation of the MAX8868EUK48-T?
The MAX8868EUK48-T requires a minimum 1µF ceramic input capacitor (X5R/X7R dielectric) and 1–10µF output capacitor (low-ESR ceramic). A 0.01µF ceramic capacitor on the BP pin is mandatory for achieving 30µVRMS noise. Stability over temperature and load is confirmed in the Region of Stable COUT ESR graph (Figure 17) and Applications Information section.
What is the maximum junction temperature and thermal shutdown behavior of the MAX8868EUK48-T?
The MAX8868EUK48-T shuts down at a junction temperature of +155°C (TSHDN) with +15°C hysteresis (∆TSHDN). After shutdown, the pass transistor remains off until the junction cools to +140°C, then resumes regulation. This behavior is documented in the Electrical Characteristics table and Detailed Description, ensuring safe operation under sustained overload.
MAX8868EUK48-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):
- 4.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.165V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- -
- PSRR:
- 63dB (10kHz)
- Control Features:
- Current Limit, 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
MAX8868EUK48-T FAQ
1.How can I place an order for MAX8868EUK48-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8868EUK48-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 MAX8868EUK48-T reliable?
The price and inventory of MAX8868EUK48-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8868EUK48-T is usually 5 days.
3.What payment methods are accepted for MAX8868EUK48-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8868EUK48-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8868EUK48-T?
MAX8868EUK48-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8868EUK48-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 MAX8868EUK48-T?
For technical support, including MAX8868EUK48-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8868EUK48-T requirements.
6.How does Aetrix verify that MAX8868EUK48-T is sourced from the original manufacturer or authorized distributors?
All MAX8868EUK48-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 MAX8868EUK48-T meets industry standards.
7.What is the process for return or replacement of MAX8868EUK48-T?
All MAX8868EUK48-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8868EUK48-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 MAX8868EUK48-T part is unused and in its original packaging.
Return procedure for MAX8868EUK48-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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