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Analog Devices Inc./Maxim Integrated MAX8867EZK29
- Part No.:
- MAX8867EZK29
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8867EZK29.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:445
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Product details
Overview
MAX8867EZK29 from Maxim Integrated is a low-noise, low-dropout linear regulator with 2.84V preset output voltage, 150mA output current capability, 30µVRMS output noise, and 165mV dropout at full load. It uses an internal P-channel MOSFET pass transistor and operates from 2.5V to 6.5V input, targeting battery-powered handheld instruments and PCMCIA cards where stable low-noise supply is critical.
For engineers reviewing the MAX8867EZK29 datasheet, MAX8867EZK29 pinout, MAX8867EZK29 application, or MAX8867EZK29 equivalent, key selection criteria include its thin SOT23-5 package, 10nA shutdown current, reverse battery protection, thermal shutdown at +155°C, and BP-pin noise-filtering architecture requiring 0.01µF ceramic capacitor.
Technical Context
The MAX8867EZK29 implements a bandgap-referenced error amplifier driving a P-channel MOSFET pass element with 1.1Ω typical RDS(ON). Its feedback network is fully internal, fixing VOUT at 2.84V with ±1.4% accuracy across -40°C to +85°C.
Noise reduction relies on a dedicated BP pin connected to an internal 200kΩ resistor forming an 80Hz low-pass filter; output noise drops to 30µVRMS (10Hz–100kHz) when 0.01µF is applied. Shutdown mode reduces supply current to 10nA and-unlike the MAX8868-does not activate auto-discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.84V ±1.4% - factory-trimmed, no external resistors required |
| Max Output Current | 150mA - supports moderate-power analog/digital subsystems |
| Dropout Voltage | 165mV at 150mA - enables operation down to VIN = 3.005V |
| Output Noise | 30µVRMS (10Hz–100kHz) - suitable for RF, ADC, and precision analog circuits |
| Quiescent Current | 100µA - constant across load and dropout, enabling long battery life |
| Shutdown Current | 10nA - ultra-low leakage during system sleep modes |
| Input Voltage Range | 2.5V to 6.5V - compatible with single Li-ion, dual alkaline, or regulated 3.3/5V rails |
Pinout & Package
SOT23-5 thin package (1.6mm × 2.9mm × 1.1mm height), thermally enhanced with GND pin serving as heatsink. Requires soldering to PCB ground plane for optimal power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low enable control | Logic-low disables regulator and reduces IQ to 10nA; no auto-discharge (distinguishes MAX8867 from MAX8868) |
| 2 GND | Power ground & thermal path | Primary heat conduction path; must connect to large copper area for >571mW dissipation |
| 3 IN | Input voltage supply | Accepts 2.5V–6.5V; requires ≥1µF bypass capacitor to suppress line noise |
| 4 OUT | Regulated output | Delivers up to 150mA; requires ≥1µF low-ESR capacitor for stability |
| 5 BP | Noise filter reference node | Connects to 0.01µF ceramic capacitor to reduce output noise by filtering reference path |
Key Features
| Feature | Design Value |
|---|---|
| Reverse battery protection | Limits reverse current to ≤1mA if VIN or SHDN falls below GND - prevents damage in miswired battery compartments |
| Thermal shutdown | Triggers at +155°C with +15°C hysteresis - protects against sustained overload without latch-up |
| Current limiting | Guarantees ≥160mA minimum limit (typ. 390mA) - allows safe short-circuit operation indefinitely |
| Low-noise BP architecture | 30µVRMS noise achieved via dedicated 0.01µF BP capacitor and internal 200kΩ filter - eliminates need for post-regulator LDO filtering |
| Stable under wide ESR range | Operates stably with COUT ESR from 0.01Ω to 10Ω at 150mA - accommodates ceramic, tantalum, and polymer capacitors |
Applications
| Hand-Held Instruments | PCMCIA Cards |
|---|---|
Use Scenario: Portable multimeters and data loggers powered by two AA batteries with dynamic load switching between analog front-end and microcontroller. IC Role / Device Role / Timing Role: Primary 2.84V supply for precision ADC reference and low-noise op-amps. Use Value: 30µVRMS noise ensures <1 LSB error in 16-bit ADC conversions; 100µA quiescent current extends battery life beyond 100 hours. | Use Scenario: Hot-pluggable PCMCIA modem card requiring clean 2.84V rail for UART and line-driver ICs during insertion/removal transients. IC Role / Device Role / Timing Role: Local point-of-load regulator isolating noisy host bus noise from sensitive analog transmit circuitry. Use Value: 63dB PSRR at 1kHz rejects host-supply ripple; reverse battery protection prevents latch-up during blind insertion. |
| Cordless Telephones | Electronic Planners |
Use Scenario: Base station handset charging cradle supplying regulated 2.84V to rechargeable NiMH pack management circuitry. IC Role / Device Role / Timing Role: Standby power source maintaining real-time clock and memory retention during AC outage. Use Value: 10nA shutdown current enables >1-year backup runtime; thermal shutdown prevents overheating during fast-charge fault conditions. | Use Scenario: Palm-sized organizer with LCD backlight, touch controller, and flash memory sharing a single 2.84V domain. IC Role / Device Role / Timing Role: Single-rail power manager delivering consistent voltage across mixed-signal loads with varying duty cycles. Use Value: 165mV dropout allows operation until battery decays to 2.99V - maximizes usable capacity of 3.0V nominal coin cell. |
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 |
|---|---|---|---|
| MAX8867EUK29-T | Same electrical specs but in regular-height SOT23-5 (1.3mm vs. 1.1mm); θJB = 140°C/W vs. 110°C/W | Less stringent board thickness constraints; lower thermal performance in high-power-density layouts | Select MAX8867EUK29-T only when mechanical clearance permits taller package and thermal margin exceeds 20°C |
| MCP1702T-2802E/MB | 2.8V output (±2%), 250mA rating, 170mV dropout at 250mA, 35µVRMS noise, no BP pin | Lacks dedicated noise-filtering node; higher noise floor limits use in sub-16-bit precision systems | Choose MCP1702T-2802E/MB only when cost sensitivity outweighs noise requirements and layout space allows larger output capacitance |
Compared with MAX8867EZK29, the MAX8867EUK29-T trades thinner profile for reduced thermal efficiency, while the MCP1702T-2802E/MB offers higher current but sacrifices 5µVRMS noise performance and BP-based noise optimization - making MAX8867EZK29 optimal for space-constrained, noise-sensitive battery-powered designs.
Availability
MAX8867EZK29 is available at Aetrix Electronics and suitable for hand-held instruments, PCMCIA cards, cordless telephones, and electronic planners requiring stable component supply across industrial temperature range (-40°C to +85°C) and long-term production continuity.
Supply support for MAX8867EZK29 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 management, sensing, and interface applications.
The MAX8867/MAX8868 product line targets portable battery-powered systems needing ultra-low-noise, low-quiescent-current regulation with robust protection features - specifically optimized for space-constrained handheld and modular devices.
FAQ
What is the exact output voltage tolerance of the MAX8867EZK29 over temperature?
The MAX8867EZK29 guarantees ±1.4% output voltage accuracy over the full operating temperature range of -40°C to +85°C, with typical deviation under ±0.5% at +25°C. This specification is ensured by factory trimming of the internal feedback divider and validated per Maxim's Statistical Quality Control methodology across production lots.
Does the MAX8867EZK29 support auto-discharge during shutdown?
No, the MAX8867EZK29 does not provide auto-discharge functionality. That feature is exclusive to the MAX8868 variant (e.g., MAX8868EZK29-T). When the MAX8867EZK29 is placed in shutdown, the output remains floating at its last regulated voltage until external discharge paths dissipate stored charge.
What capacitor value is required on the BP pin of the MAX8867EZK29 for minimum output noise?
A 0.01µF X7R or C0G ceramic capacitor is required on the BP pin of the MAX8867EZK29 to achieve the specified 30µVRMS output noise (10Hz–100kHz). Larger values (e.g., 0.1µF) marginally reduce noise but increase startup time and are not recommended per Maxim's design guidelines.
Can the MAX8867EZK29 operate with a 2.5V input when regulating 2.84V output?
No - the MAX8867EZK29 cannot regulate 2.84V output from a 2.5V input because the minimum input voltage must exceed the output voltage by the dropout voltage. At 150mA, dropout is 165mV, so minimum valid input is 2.84V + 0.165V = 3.005V. Operation below this violates regulation and causes output collapse.
Is the MAX8867EZK29 pin-compatible with the MAX8863 series?
Yes, the MAX8867EZK29 is pin-compatible with the MAX8863 and MAX8864 series except for the BP pin function. The MAX8863/64 lack the BP pin entirely; therefore, direct replacement requires leaving pin 5 unconnected or grounding it per legacy design - but noise performance will degrade without BP filtering.
MAX8867EZK29 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- TSOT-23-5
MAX8867EZK29 FAQ
1.How can I place an order for MAX8867EZK29 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8867EZK29 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 MAX8867EZK29 reliable?
The price and inventory of MAX8867EZK29 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8867EZK29 is usually 5 days.
3.What payment methods are accepted for MAX8867EZK29?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8867EZK29 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8867EZK29?
MAX8867EZK29 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8867EZK29 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 MAX8867EZK29?
For technical support, including MAX8867EZK29 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8867EZK29 requirements.
6.How does Aetrix verify that MAX8867EZK29 is sourced from the original manufacturer or authorized distributors?
All MAX8867EZK29 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 MAX8867EZK29 meets industry standards.
7.What is the process for return or replacement of MAX8867EZK29?
All MAX8867EZK29 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8867EZK29, 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 MAX8867EZK29 part is unused and in its original packaging.
Return procedure for MAX8867EZK29:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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