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Analog Devices Inc./Maxim Integrated MAX8891EXK31+T
- Part No.:
- MAX8891EXK31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX8891EXK31+T.pdf
- Description:
- IC REG LINEAR 3.1V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,733
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Product details
Overview
The MAX8891EXK31+T from Maxim Integrated is a fixed-output, low-dropout linear regulator delivering 3.1V 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 radios and digital cameras.
For engineers reviewing the MAX8891EXK31+T datasheet, MAX8891EXK31+T pinout, MAX8891EXK31+T application, or MAX8891EXK31+T equivalent, key selection criteria include guaranteed 150mA output, SC70-5 package footprint, 1µF ceramic capacitor stability, thermal/overcurrent protection, and shutdown current <1µA.
Technical Context
The MAX8891EXK31+T uses an internal p-channel MOSFET pass transistor (RDS(ON) ≈ 1Ω) enabling low dropout and minimal ground current across load and temperature. Its bandgap reference (1.225V) and error amplifier regulate output via a factory-trimmed internal resistor divider, eliminating external feedback components.
It operates from 2V to 6V input, supports stable regulation with only 1µF input and output ceramic capacitors (X7R/X5R), and integrates thermal shutdown (160°C trip, 10°C hysteresis) and current limiting (200mA). Shutdown is controlled by a logic-compatible SHDN pin with <0.01µA bias current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.1V ±3% - factory-trimmed for precision without external resistors. |
| Max Output Current | 150mA continuous - sufficient for RF front-ends and camera sensor rails. |
| Dropout Voltage | 120mV at 120mA - enables operation down to 3.22V input with 3.1V output. |
| Ground Current | 40µA typical at light load - extends battery life in standby modes. |
| PSRR | 65dB at 10kHz - suppresses switching noise from DC-DC converters feeding its input. |
| Capacitor Requirement | Stable with 1µF ceramic (X7R/X5R) on IN and OUT - reduces BOM count and PCB area. |
| Shutdown Current | <1µA - ensures negligible drain during system sleep states. |
Pinout & Package
Supplied in a 5-pin SC70 package (2.0mm × 1.25mm × 0.9mm height), 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 filtering. |
| 2 - GND | Ground Reference & Thermal Path | Electrical return and primary heat sink; must connect to large copper area for thermal management. |
| 3 - SHDN | Active-Low Enable Control | Pull ≤0.4V to disable regulator; draws <0.01µA; tie to IN for always-on operation. |
| 4 - N.C. | No Internal Connection | Not bonded; leave unconnected - no routing or pull-up/pull-down required. |
| 5 - OUT | Regulated Output | Delivers 3.1V ±3%; bypass with 1µF ceramic to GND; high-impedance when disabled. |
Key Features
| Feature | Design Value |
|---|---|
| SC70-5 Package Footprint | 2.0mm × 1.25mm area - fits dense portable PCBs where QFN or SOT-23 are too large. |
| 1µF Ceramic Stability | Eliminates need for tantalum or aluminum electrolytics - improves reliability and reduces cost. |
| P-Channel Pass Transistor | Enables ultra-low quiescent current (40µA) independent of load - unlike PNP-based LDOs. |
| Integrated Protection | Thermal shutdown (160°C) + current limit (200mA) - allows safe continuous short-circuit operation. |
| High PSRR Architecture | 65dB rejection at 10kHz - maintains clean 3.1V rail despite noisy DC-DC input sources. |
Applications
| Bluetooth Portable Radios | Digital Cameras |
|---|---|
Use Scenario: Powering RF transceiver ICs and baseband processors in compact Bluetooth headsets and dongles. IC Role / Device Role / Timing Role: Primary 3.1V supply rail regulator ensuring stable voltage under fast RF transmit/receive load transients. Use Value: 120mV dropout and 65dB PSRR prevent RF-induced supply droop and noise coupling into sensitive analog blocks. | Use Scenario: Supplying image sensor and ISP core voltage in consumer digital cameras with tight space constraints. IC Role / Device Role / Timing Role: Low-noise, fixed 3.1V LDO delivering regulated power during burst-mode capture and video streaming. Use Value: 230µV RMS output noise and excellent load transient response (<10mV deviation) preserve image SNR and timing integrity. |
| Cellular Handsets | Portable Audio Devices |
Use Scenario: Providing auxiliary 3.1V rail for audio codecs or display drivers in multi-rail smartphone subsystems. IC Role / Device Role / Timing Role: Secondary LDO decoupling switched-mode power supplies to reduce ripple on analog signal paths. Use Value: 1µF ceramic compatibility and 0.003%/mA load regulation minimize voltage drift across varying processor activity states. | Use Scenario: Powering DACs, headphone amplifiers, and DSP cores in battery-powered personal stereos. IC Role / Device Role / Timing Role: Ultra-low-quiescent (40µA) LDO maintaining 3.1V rail during playback and deep-sleep modes. Use Value: Sub-1µA shutdown current and minimal ground current extend playback time between charges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS78231DRVR | 3.1V fixed, 150mA, 250mV dropout at 150mA, 1.8µA IQ, 5-pin WSON | Higher dropout and lower PSRR (55dB @ 10kHz); larger package (2.0mm × 2.0mm) | Choose if ultra-low IQ dominates over dropout and noise performance. |
| MCP1700-3102E/TO | 3.1V fixed, 250mA, 600mV dropout at 250mA, 1.6µA IQ, SOT-23-5 | Higher dropout, lower max current rating, no thermal shutdown, larger footprint | Choose for cost-sensitive designs where 3.1V accuracy and 150mA delivery are secondary to BOM cost. |
Compared with TPS78231DRVR and MCP1700-3102E/TO, the MAX8891EXK31+T delivers superior dropout (120mV vs. ≥250mV), higher PSRR (65dB vs. ≤55dB), and integrated thermal protection - critical for thermally constrained portable enclosures.
Availability
MAX8891EXK31+T is available at Aetrix Electronics and suitable for Bluetooth radios, digital cameras, and cellular handset subsystems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8891EXK31+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 targets space- and power-constrained portable electronics, delivering high-PSRR, low-IQ LDO regulation with minimal external components - specifically for battery-powered RF and imaging subsystems.
FAQ
What is the output voltage tolerance of the MAX8891EXK31+T?
The MAX8891EXK31+T has a guaranteed output voltage tolerance of ±3% over -40°C to +85°C and full load range (100μA to 80mA), per the Electrical Characteristics table. This 3.1V ±3% spec ensures reliable operation for 3.3V-tolerant I/O interfaces and analog circuits requiring tight DC accuracy. The MAX8891EXK31+T achieves this via factory laser trimming of its internal feedback divider.
Can the MAX8891EXK31+T operate with ceramic capacitors smaller than 1µF?
No - the MAX8891EXK31+T requires a minimum 1µF ceramic capacitor on both input and output for guaranteed stability across all operating conditions. Using smaller values risks oscillation or degraded transient response. X7R or X5R dielectrics are recommended; Z5U/Y5V types may require ≥2.2µF below -10°C. The MAX8891EXK31+T's stability region is validated only with ≥1µF capacitance.
Does the MAX8891EXK31+T include thermal shutdown protection?
Yes, the MAX8891EXK31+T includes fully integrated thermal shutdown protection that activates at +160°C junction temperature with 10°C hysteresis. When triggered, the pass transistor turns off and the output enters high-impedance state until the die cools to +150°C. This protects the MAX8891EXK31+T during sustained overload or poor PCB thermal design - a feature not present in many competing low-cost LDOs.
What is the maximum input voltage the MAX8891EXK31+T can tolerate?
The MAX8891EXK31+T supports an absolute maximum input voltage of +7V relative to GND, but its operational input voltage range is specified from 2V to 6V. Operating above 6V violates the recommended conditions in the datasheet and may degrade long-term reliability or parametric performance. For 3.1V output, the practical upper limit is VIN ≤ VOUT + dropout + margin = ~3.5V under heavy load - though the MAX8891EXK31+T remains functional up to 6V.
How does the shutdown function behave on the MAX8891EXK31+T?
When the SHDN pin is pulled low (≤0.4V), the MAX8891EXK31+T disables its bandgap reference, error amplifier, gate driver, and pass transistor - reducing total supply current to <1µA and placing the OUT pin in high-impedance state. The MAX8891EXK31+T resumes regulation within microseconds after SHDN rises above 1.5V. No external pull-up is needed; tying SHDN to IN provides default enabled operation.
MAX8891EXK31+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:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 3.1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.12V @ 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
MAX8891EXK31+T FAQ
1.How can I place an order for MAX8891EXK31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8891EXK31+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 MAX8891EXK31+T reliable?
The price and inventory of MAX8891EXK31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8891EXK31+T is usually 5 days.
3.What payment methods are accepted for MAX8891EXK31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8891EXK31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8891EXK31+T?
MAX8891EXK31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8891EXK31+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 MAX8891EXK31+T?
For technical support, including MAX8891EXK31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8891EXK31+T requirements.
6.How does Aetrix verify that MAX8891EXK31+T is sourced from the original manufacturer or authorized distributors?
All MAX8891EXK31+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 MAX8891EXK31+T meets industry standards.
7.What is the process for return or replacement of MAX8891EXK31+T?
All MAX8891EXK31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8891EXK31+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 MAX8891EXK31+T part is unused and in its original packaging.
Return procedure for MAX8891EXK31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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