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Analog Devices Inc./Maxim Integrated MAX8891EXK29+T
- Part No.:
- MAX8891EXK29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX8891EXK29+T.pdf
- Description:
- IC REG LINEAR 2.85V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,965
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Product details
Overview
The MAX8891EXK29+T from Maxim Integrated is a fixed-output, low-dropout linear regulator delivering 2.85V at up to 150mA with 120mV dropout at 120mA load, 40µA ground current, and 65dB PSRR at 10kHz-designed for space-constrained battery-powered systems such as Bluetooth accessories and digital cameras.
For engineers reviewing the MAX8891EXK29+T datasheet, MAX8891EXK29+T pinout, MAX8891EXK29+T application, or MAX8891EXK29+T equivalent, key selection criteria include guaranteed 150mA output, SC70-5 package footprint, 1µF ceramic capacitor stability, shutdown current <1µA, and thermal/overcurrent protection-critical for portable electronics power rail design.
Technical Context
The MAX8891EXK29+T uses an internal 1.225V bandgap reference and error amplifier to regulate output via a p-channel MOSFET pass transistor (RDS(ON) ≈ 1Ω), enabling low dropout and minimal ground current across load and temperature. Its architecture eliminates base-drive losses inherent in PNP-based LDOs.
It operates with input voltage from 2V to 6V and maintains ±3% output accuracy over -40°C to +85°C, with line regulation of 0.001%/V and load regulation of 0.003%/mA. Shutdown logic disables the reference, error amp, and gate driver, placing OUT in high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.85V - factory-trimmed, no external feedback required. |
| Max Output Current | 150mA continuous - supports moderate-power analog/digital rails without derating. |
| Dropout Voltage | 120mV at 120mA - enables operation down to VIN = 2.97V while maintaining regulation. |
| Ground Current | 40µA at light load - extends battery life in standby and low-power modes. |
| PSRR | 65dB at 10kHz - suppresses switching noise from upstream DC/DC converters. |
| Capacitor Requirement | Stable with 1µF ceramic on IN and OUT - reduces BOM count and PCB area vs. larger electrolytics. |
| Shutdown Current | <1µA - essential for zero-power sleep states in portable devices. |
Pinout & Package
Supplied in a 5-pin SC70 package (2.0mm × 1.25mm × 0.9mm), optimized for ultra-compact layouts and thermal conduction via GND pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Unregulated Input Supply | Accepts 2V–6V input; requires 1µF ceramic bypass to GND for stability and noise rejection. |
| 2 - GND | Ground Reference & Thermal Path | Electrical return and primary heat dissipation path; must connect to large copper area or ground plane. |
| 3 - SHDN | Active-Low Enable Control | Pull ≤0.4V to disable regulator; draws <0.05µA in shutdown; tie to IN for always-on operation. |
| 4 - N.C. | No Internal Connection | Not bonded; left floating-no routing or termination required. |
| 5 - OUT | Regulated Output | Delivers 2.85V ±3%; bypass with 1µF ceramic to GND; high-impedance when SHDN asserted. |
Key Features
| Feature | Design Value |
|---|---|
| p-Channel MOSFET Pass Transistor | Eliminates base-drive current, enabling 40µA quiescent current and stable dropout performance under load. |
| Thermal & Overcurrent Protection | Shuts down at 160°C junction temp with 10°C hysteresis; limits output to 200mA continuously without damage. |
| 1µF Ceramic Stability | Guaranteed stable operation with low-ESR 1µF X7R/X5R capacitors across full temperature range - no compensation needed. |
| High PSRR Architecture | 65dB rejection at 10kHz enables clean power delivery in noisy RF/battery systems without additional filtering. |
| Low-Noise Output | 230µV RMS noise (100Hz–100kHz) supports sensitive analog circuits like ADCs and RF front-ends. |
Applications
| Bluetooth Portable Radios | Digital Cameras |
|---|---|
Use Scenario: Powering RF transceiver ICs and baseband processors during active transmission and low-power listening modes. IC Role / Device Role / Timing Role: Primary 2.85V supply rail for RF section, providing low-noise, fast transient response to handle burst transmit currents. Use Value: 120mV dropout extends usable battery voltage range; 65dB PSRR prevents RF interference coupling into sensitive receive paths. | Use Scenario: Supplying image sensor bias and ISP core logic in compact point-and-shoot cameras with Li-ion batteries. IC Role / Device Role / Timing Role: Fixed 2.85V LDO for analog sensor interface and low-power digital subsystems requiring tight voltage tolerance. Use Value: ±3% output accuracy ensures consistent sensor gain calibration; 40µA ground current minimizes standby drain during idle capture intervals. |
| Portable Stereos | Cellular Handsets |
Use Scenario: Delivering clean 2.85V to audio DACs, headphone amplifiers, and codec I/O interfaces in battery-operated music players. IC Role / Device Role / Timing Role: Low-noise power source for audio signal chain components where PSRR directly impacts SNR and THD. Use Value: 230µV RMS output noise avoids audible hiss; 1µF ceramic compatibility simplifies layout in dense audio PCBs. | Use Scenario: Powering auxiliary subsystems such as SIM card interface, backlight drivers, or touch controller in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Secondary regulated rail decoupled from main PMIC, supporting peripherals needing precise 2.85V with fast load step response. Use Value: Excellent load transient response (≤10mV deviation at 5mA/μs) prevents brownout glitches during burst data transfers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS780285DRVR | 2.85V fixed, 150mA, 250mV dropout at 150mA, 500nA shutdown current, WSON-6 package (2.0mm × 2.0mm). | Lower shutdown current but higher dropout; larger footprint; requires 2.2µF output cap for stability. | Select when ultra-low shutdown current dominates over dropout and board area. |
| MCP1702T-285I/OT | 2.85V fixed, 250mA, 600mV dropout at 250mA, 2.5µA quiescent current, SOT-23-5 package. | Higher dropout and ground current; wider input range (2.7V–13.2V); no thermal shutdown. | Select when higher output current headroom is needed and thermal protection is managed externally. |
Compared with TPS780285DRVR and MCP1702T-285I/OT, the MAX8891EXK29+T offers the lowest dropout (120mV) and smallest footprint (SC70-5), making it optimal for space- and battery-life-critical 2.85V rails where thermal robustness and 1µF stability are mandatory.
Availability
The MAX8891EXK29+T is available at Aetrix Electronics and suitable for Bluetooth accessories, digital cameras, portable stereos, and cellular handset subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8891EXK29+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 precision analog, mixed-signal, and power management ICs for demanding industrial, communications, and consumer applications.
The MAX8891/MAX8892 product line delivers high-PSRR, low-quiescent-current LDOs in ultra-small packages for battery-powered portable electronics where efficiency, size, and noise immunity are critical.
FAQ
What is the output voltage tolerance of the MAX8891EXK29+T over temperature and load?
The MAX8891EXK29+T guarantees ±3% output voltage accuracy across -40°C to +85°C ambient temperature and for output loads from 100μA to 80mA. At room temperature, typical deviation is within ±0.2%, and the device maintains this stability due to its internal 1.225V bandgap reference and precision trimming. This tolerance ensures reliable operation for 2.85V-dependent circuits like RF transceivers and image sensors without external calibration.
Can the MAX8891EXK29+T operate with input voltages below 2.85V?
No-the MAX8891EXK29+T requires a minimum input voltage of 2V, but regulation is only maintained when VIN ≥ VOUT + dropout voltage. With a 2.85V output and 120mV dropout at 120mA, the minimum functional input is 2.97V. Below that, the device enters dropout and output drops linearly with input. For sub-2.97V operation, a lower-VOUT LDO or buck converter is required.
Does the MAX8891EXK29+T require external compensation components?
No-the MAX8891EXK29+T is internally compensated and stable with only 1µF ceramic capacitors on both input and output pins. Its design eliminates the need for external resistors, capacitors, or ESR tuning. Using X7R or X5R dielectric 1µF ceramics ensures stability across -40°C to +85°C; Z5U/Y5V types may require ≥2.2µF below -10°C.
How does the thermal shutdown feature behave in sustained overload conditions?
When the MAX8891EXK29+T junction temperature exceeds +160°C, thermal shutdown activates, turning off the pass transistor. After cooling by 10°C (to +150°C), the device automatically resumes regulation. Under continuous overload, this results in pulsed output-protecting the IC but not intended for steady-state operation. Designers must ensure power dissipation stays within limits using the SC70 package's θJA = 324°C/W and proper PCB copper area.
Is the MAX8891EXK29+T pin-compatible with other variants in the MAX8891 family?
Yes-all MAX8891 variants (e.g., MAX8891EXK15+T, MAX8891EXK33+T) share identical SC70-5 pinout, electrical behavior, and package dimensions. Only the factory-set output voltage differs. This allows drop-in replacement across voltage options without layout changes, provided the new voltage meets system requirements and load characteristics remain compatible.
MAX8891EXK29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.135V @ 120mA (Typ)
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 40 µA
- Current - Supply (Max):
- -
- PSRR:
- 65dB (10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
MAX8891EXK29+T FAQ
1.How can I place an order for MAX8891EXK29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8891EXK29+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 MAX8891EXK29+T reliable?
The price and inventory of MAX8891EXK29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8891EXK29+T is usually 5 days.
3.What payment methods are accepted for MAX8891EXK29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8891EXK29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8891EXK29+T?
MAX8891EXK29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8891EXK29+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 MAX8891EXK29+T?
For technical support, including MAX8891EXK29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8891EXK29+T requirements.
6.How does Aetrix verify that MAX8891EXK29+T is sourced from the original manufacturer or authorized distributors?
All MAX8891EXK29+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 MAX8891EXK29+T meets industry standards.
7.What is the process for return or replacement of MAX8891EXK29+T?
All MAX8891EXK29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8891EXK29+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 MAX8891EXK29+T part is unused and in its original packaging.
Return procedure for MAX8891EXK29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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