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Analog Devices Inc./Maxim Integrated MAX8867EUK29+
- Part No.:
- MAX8867EUK29+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8867EUK29+.pdf
- Description:
- IC REG LINEAR LOW NOISE LDO
- Quantity:
- Payment:
- Shipping:
Inventory:2,797
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Product details
Overview
MAX8867EUK29+ from Maxim Integrated is a low-noise, low-dropout linear regulator with a factory-preset 2.84V output, 150mA maximum output current, 165mV dropout at full load, 30µVRMS output noise, and 100µA operating supply current. It employs an internal P-channel MOSFET pass transistor and operates from 2.5V to 6.5V input, serving as a precision power source for battery-powered RF and analog signal chains in portable communications devices.
For engineers reviewing the MAX8867EUK29+ datasheet, MAX8867EUK29+ pinout, MAX8867EUK29+ application, or MAX8867EUK29+ equivalent, key selection criteria include guaranteed ±1.4% output voltage accuracy over temperature, reverse battery protection, thermal shutdown at +155°C, and compatibility with 1µF ceramic output capacitors across -40°C to +85°C.
Technical Context
The MAX8867EUK29+ uses a 1.25V bandgap reference and error amplifier to regulate output via feedback from an internal resistor divider - no external resistors required. Its P-channel MOSFET pass element eliminates base-drive current, enabling stable 100µA quiescent current regardless of load or dropout condition.
It integrates dedicated circuitry for reverse battery protection (limits reverse current to 1mA), thermal overload shutdown with 15°C hysteresis, and short-circuit current limiting (160–390mA range). The BP pin accepts a 0.01µF ceramic capacitor to form an 80Hz low-pass filter that reduces output noise to 30µVRMS (10Hz–100kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.84V ±1.4% - factory-trimmed, no external components needed |
| Max Output Current | 150mA - supports RF front-ends and low-power microcontrollers |
| Dropout Voltage | 165mV at 150mA - enables operation down to 3.005V input with 2.84V output |
| Output Noise | 30µVRMS (10Hz–100kHz) - suitable for noise-sensitive ADCs and VCOs |
| Quiescent Current | 100µA - constant across load, dropout, and temperature |
| Shutdown Current | 10nA - enables ultra-low-power system sleep modes |
| Input Voltage Range | 2.5V to 6.5V - compatible with single Li-ion, dual Alkaline, or regulated 3.3V/5V rails |
Pinout & Package
The MAX8867EUK29+ is housed in a standard 5-pin SOT23-5 (regular thickness) package with exposed pad thermal enhancement. Pin 2 (GND) serves as both electrical ground and primary heat path; soldering to a large PCB copper area is required for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low enable | Pulls supply current to 10nA when logic low; no auto-discharge (MAX8868 feature only) |
| 2 - GND | Ground reference & thermal sink | Must be connected to large PCB ground plane for thermal management and noise control |
| 3 - IN | Input voltage supply | Accepts 2.5V–6.5V; requires ≥1µF bypass capacitor to GND |
| 4 - OUT | Regulated output | Delivers up to 150mA; requires ≥1µF low-ESR ceramic capacitor to GND |
| 5 - BP | Noise-reduction bypass | Connects to 0.01µF ceramic capacitor to reduce output noise by filtering reference node |
Key Features
| Feature | Design Value |
|---|---|
| Reverse battery protection | Limits reverse current to ≤1mA when VIN or SHDN falls below GND - prevents damage in miswired battery compartments |
| Thermal shutdown with hysteresis | Triggers at +155°C junction temperature and re-enables after cooling by 15°C - avoids thermal oscillation during sustained overload |
| Stable with 1µF ceramic output cap | Guaranteed stability across -40°C to +85°C using X7R/X5R dielectrics - eliminates need for larger or higher-ESR capacitors |
| Load regulation | ±0.01%/mA - maintains tight output voltage under dynamic load changes typical in digital baseband ICs |
| Line regulation | ±0.15%/V - minimizes output drift during battery discharge or upstream rail variation |
Applications
| Cellular RF Power Amplifier Bias | Low-Power Microcontroller Core Supply |
|---|---|
Use Scenario: Providing clean, stable bias voltage to GaAs pHEMT power amplifiers in GSM/EDGE handsets during transmit bursts. IC Role / Device Role / Timing Role: Low-noise LDO delivering 2.84V at up to 150mA with <12mV load transient deviation. Use Value: Prevents AM-to-PM distortion and spectral regrowth by maintaining voltage within ±15mV during 0→150mA load steps. | Use Scenario: Powering ARM Cortex-M0+ core and embedded flash in portable medical sensors operating from coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Primary system regulator supplying 2.84V core rail with 100µA quiescent current and 10nA shutdown mode. Use Value: Extends battery life beyond 5 years in sleep-dominated operation while ensuring fast wake-up (<300µs exit delay). |
| Portable Audio Codec Reference Supply | ISM Band Transceiver VCO Tuning Rail |
Use Scenario: Generating ultra-low-noise analog supply for stereo audio DACs and headphone amplifiers in Bluetooth earbuds. IC Role / Device Role / Timing Role: Dedicated 2.84V LDO with 30µVRMS noise feeding DAC reference and analog output stages. Use Value: Achieves >105dB SNR by eliminating switching noise coupling into sensitive audio paths. | Use Scenario: Supplying tuning voltage to varactor diodes in 2.4GHz BLE/Wi-Fi transceivers where supply ripple directly modulates carrier frequency. IC Role / Device Role / Timing Role: Low-drift, low-noise 2.84V rail with ±0.01%/mA load regulation for VCO control loop stability. Use Value: Reduces integrated phase jitter by 35% compared to standard LDOs, improving EVM and receiver sensitivity. |
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 |
|---|---|---|---|
| TPS78228DRVT | 2.8V output, 150mA, 170mV dropout, 15µVRMS noise, 500nA IQ in shutdown | Lacks reverse battery protection; requires external 100nF BP capacitor | Preferred where lowest noise and ultra-deep shutdown dominate over fault protection |
| MCP1702T-2802E/MB | 2.8V output, 250mA, 600mV dropout, 30µVRMS noise, 4µA IQ | Higher dropout limits usable battery range; no reverse polarity or thermal shutdown | Suitable for cost-sensitive industrial sensors where input voltage remains >3.4V |
Compared with TPS78228DRVT and MCP1702T-2802E/MB, the MAX8867EUK29+ uniquely combines reverse battery protection, thermal shutdown, and 100µA operating current with 30µVRMS noise - making it the only option qualified for consumer handhelds with unmanaged battery insertion and RF-sensitive analog loads.
Availability
MAX8867EUK29+ is available at Aetrix Electronics and suitable for cellular telephones, portable medical instruments, Bluetooth audio devices, and ISM-band wireless modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX8867EUK29+ 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 and mixed-signal ICs for power, sensing, interface, and RF applications in demanding environments.
The MAX8867/MAX8868 product line was engineered specifically for battery-powered portable electronics requiring ultra-low noise, low quiescent current, and robust fault protection - targeting cellular handsets, modems, and handheld instrumentation.
FAQ
What is the exact output voltage tolerance of the MAX8867EUK29+ over temperature?
The MAX8867EUK29+ guarantees ±1.4% output voltage accuracy over the full -40°C to +85°C operating temperature range. This specification includes initial trim error, line regulation, load regulation, and temperature drift - all verified per Maxim's Statistical Quality Control methodology. At +25°C, typical deviation is ±0.5%, and measured drift versus temperature is less than 0.01%/°C. The MAX8867EUK29+ achieves this without external components due to factory laser-trimming of its internal feedback divider.
Does the MAX8867EUK29+ support auto-discharge during shutdown?
No, the MAX8867EUK29+ does not include auto-discharge functionality. That feature is exclusive to the MAX8868 family variants (e.g., MAX8868EUK29+). When the MAX8867EUK29+ is placed in shutdown via the SHDN pin, the output remains floating at its last regulated voltage; it does not actively pull the OUT pin to GND. Designers requiring active discharge must select the MAX8868 variant or add external circuitry. The MAX8867EUK29+ datasheet explicitly states auto-discharge is "MAX8868 only" in both the General Description and Pin Description sections.
What is the minimum recommended output capacitor for stable operation of the MAX8867EUK29+?
The MAX8867EUK29+ requires a minimum 1µF ceramic output capacitor with X7R or X5R dielectric for stable operation across -40°C to +85°C and up to 150mA load. This value is validated in the "Region of Stable COUT ESR vs. Load Current" graph and confirmed in the Applications Information section. Using Z5U or Y5V dielectrics may require ≥2.2µF due to capacitance loss at low temperatures. Tantalum capacitors are not recommended unless ESR is tightly controlled between 0.1Ω and 1Ω - otherwise instability or oscillation may occur.
Can the MAX8867EUK29+ operate with an input voltage lower than 2.5V?
No, the MAX8867EUK29+ has a strict absolute maximum rating of 2.5V minimum input voltage. Operation below 2.5V violates the Absolute Maximum Ratings table and risks improper regulation, increased dropout, or failure to maintain output voltage. At 2.5V input, the device can sustain only very light loads before dropping out - for example, with 2.84V output, the theoretical maximum load at VIN = 2.5V is zero, since dropout exceeds the available headroom. The recommended operating range starts at VIN ≥ VOUT + 0.3V (≥3.14V) for reliable 150mA delivery.
Is the MAX8867EUK29+ pin-compatible with the MAX8863 series?
The MAX8867EUK29+ is pin-compatible with the MAX8863 and MAX8864 in all functions except the BP pin. As stated in the General Description, "The MAX8867 and MAX8868 are pin-compatible with the MAX8863 and MAX8864, except for the BP pin." The MAX8863/64 lack the BP pin and corresponding noise-reduction circuitry; therefore, substituting MAX8867EUK29+ into a MAX8863 layout requires leaving the BP pin unconnected or grounding it - but doing so forfeits the 30µVRMS noise performance. Full functional replacement requires verifying BP pin handling in the target PCB design.
MAX8867EUK29+ 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):
- 2.9V
- 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
MAX8867EUK29+ FAQ
1.How can I place an order for MAX8867EUK29+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8867EUK29+ 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 MAX8867EUK29+ reliable?
The price and inventory of MAX8867EUK29+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8867EUK29+ is usually 5 days.
3.What payment methods are accepted for MAX8867EUK29+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8867EUK29+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8867EUK29+?
MAX8867EUK29+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8867EUK29+ 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 MAX8867EUK29+?
For technical support, including MAX8867EUK29+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8867EUK29+ requirements.
6.How does Aetrix verify that MAX8867EUK29+ is sourced from the original manufacturer or authorized distributors?
All MAX8867EUK29+ 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 MAX8867EUK29+ meets industry standards.
7.What is the process for return or replacement of MAX8867EUK29+?
All MAX8867EUK29+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8867EUK29+, 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 MAX8867EUK29+ part is unused and in its original packaging.
Return procedure for MAX8867EUK29+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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