My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX8868EUK29
- Part No.:
- MAX8868EUK29
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8868EUK29.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:1,645
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX8868EUK29 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 features auto-discharge during shutdown, reverse battery protection, and operates from 2.5V to 6.5V input - used in battery-powered handheld instruments and PCMCIA cards where stable low-noise supply is critical.
For engineers reviewing the MAX8868EUK29 datasheet, MAX8868EUK29 pinout, MAX8868EUK29 application, or MAX8868EUK29 equivalent, this page delivers verified specifications, SOT23-5 pin mapping, real-world use cases, and validated alternative parts for portable power management design.
Technical Context
The MAX8868EUK29 uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling ultra-low quiescent current (100µA across all load and dropout conditions) and eliminating base-drive losses common in PNP-based LDOs. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin.
Auto-discharge functionality is exclusive to the MAX8868 variant and activates when SHDN is pulled low, actively sinking output current through an internal discharge path to ground. The BP pin connects to an internal 200kΩ resistor forming an 80Hz low-pass filter with a 0.01µF external capacitor to suppress reference noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.84V ±1.4% - factory-preset, eliminates external feedback resistors and ensures tight regulation over temperature (-40°C to +85°C). |
| Max Output Current | 150mA - sufficient for powering RF front-ends, microcontroller cores, or analog sensor signal chains in portable devices. |
| Dropout Voltage | 165mV at 150mA - enables operation down to ~2.675V input with 2.84V output, extending usable battery life in single-cell Li-ion or alkaline systems. |
| Output Noise | 30µVRMS (10Hz–100kHz) - achieved via BP pin filtering; critical for noise-sensitive ADCs, PLLs, or RF synthesizers. |
| Quiescent Current | 100µA (operating), 10nA (shutdown) - maintains battery longevity in always-on or sleep-mode applications like electronic planners. |
| Shutdown Discharge | Active discharge path to GND - prevents floating output during shutdown, avoiding unintended biasing of downstream circuitry. |
| Protection Features | Thermal shutdown (155°C), short-circuit limit (160–500mA), reverse battery protection (<1mA reverse current) - ensures robustness in unregulated or miswired battery environments. |
Pinout & Package
SOT23-5 regular package (JEDEC MO-178AA); 5-pin surface-mount with exposed thermal pad on GND pin - requires soldering to large PCB copper area for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low enable/discharge control | Pulling low disables regulation and activates auto-discharge; high-impedance input with 0.5nA bias current. |
| 2 - GND | Power ground & thermal sink | Electrical return path and primary heat conduction route; must connect to ≥100mm² copper pour for 571mW max dissipation. |
| 3 - IN | Input voltage supply | Accepts 2.5V–6.5V; requires 1µF ceramic bypass to GND near pin for stability and line-transient suppression. |
| 4 - OUT | Regulated output | Delivers up to 150mA; requires 1–10µF low-ESR ceramic capacitor to GND for load-transient response and PSRR optimization. |
| 5 - BP | Noise-reduction bypass node | Connects to internal 200kΩ resistor; 0.01µF ceramic capacitor reduces reference noise, lowering total output noise to 30µVRMS. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge on shutdown | Internally sinks OUT to GND when SHDN = low - eliminates need for external discharge FET in space-constrained designs. |
| Reverse battery protection | Limits reverse current to <1mA if VIN or SHDN falls below GND - prevents damage during battery insertion errors or polarity reversal. |
| P-channel MOSFET pass element | 1.1Ω typical RDS(ON) - enables constant 100µA IQ regardless of load or dropout, unlike PNP regulators that increase IQ under heavy load or dropout. |
| Low-noise BP filtering | 80Hz RC filter formed by internal 200kΩ and external 0.01µF capacitor - directly reduces reference noise contribution to output voltage. |
| Thermal shutdown with hysteresis | Triggers at 155°C junction temp, re-enables after 20°C cooldown - provides safe pulsed operation during sustained overload without latch-up. |
Applications
| Hand-Held Instruments | PCMCIA Cards |
|---|---|
Use Scenario: Portable multimeters and oscilloscopes powered by two AA batteries requiring clean, stable 2.84V supply for precision ADC reference and analog front-end. IC Role / Device Role / Timing Role: Primary low-noise LDO delivering regulated 2.84V to signal-chain components while maintaining <30µVRMS noise floor. Use Value: Enables 16-bit measurement accuracy by suppressing supply-induced quantization noise and drift across temperature. | Use Scenario: Memory or I/O expansion cards inserting into laptop PCMCIA slots with variable input voltage and strict inrush/standby current limits. IC Role / Device Role / Timing Role: Local point-of-load regulator providing 2.84V to card logic and interface circuitry with fast shutdown discharge to meet hot-swap timing requirements. Use Value: Auto-discharge ensures VOUT drops below 0.5V within microseconds of SHDN assertion, satisfying PCMCIA specification for safe card removal. |
| Electronic Planners | Cordless Telephones |
Use Scenario: Battery-operated PDAs with backlight, touch controller, and real-time clock needing ultra-low quiescent current during deep sleep modes. IC Role / Device Role / Timing Role: Always-on LDO supplying RTC and memory retention rails with 10nA shutdown current and rapid wake-up (<300µs exit delay). Use Value: Extends shelf life and operational runtime by minimizing standby leakage - 10nA shutdown draws <1µAh/year from a CR2032 coin cell. | Use Scenario: DECT cordless phone handsets using single-cell Li-ion with dynamic load steps during RF transmit bursts and audio playback. IC Role / Device Role / Timing Role: Main system LDO delivering 2.84V to baseband processor and audio codec with 12mV load-transient deviation (0→50mA step). Use Value: Maintains digital logic integrity and analog audio fidelity during burst-mode transmission without brownout or audible pop artifacts. |
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 | No auto-discharge; identical pinout, output voltage, and noise specs; same 100µA operating IQ. | Used where output discharge is handled externally or unnecessary; lacks active sink during shutdown. | Select when board layout already includes discharge circuitry or when cost sensitivity outweighs auto-discharge benefit. |
| Torex XC6206P282MR | 2.8V output (±2%), 100mA max, 45µVRMS noise, no BP pin or auto-discharge; SOT23-5 compatible footprint but different pin assignment (SHDN on pin 3). | Suitable for simpler, lower-current applications without stringent noise or discharge requirements. | Choose only if redesign allows pinout adaptation and 150mA/30µVRMS margin is not required. |
Compared with MAX8867EUK29, the MAX8868EUK29 adds indispensable auto-discharge for hot-swap compliance, while Torex XC6206P282MR trades performance for cost and lacks key protections - making MAX8868EUK29 optimal for noise-critical, battery-powered systems demanding guaranteed shutdown behavior.
Availability
MAX8868EUK29 is available at Aetrix Electronics and suitable for handheld instruments, PCMCIA cards, electronic planners, and cordless telephones requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across industrial temperature range.
Supply support for MAX8868EUK29 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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer markets.
The MAX8867/MAX8868 product line was designed specifically for battery-powered portable electronics requiring ultra-low noise, low dropout, and minimal quiescent current - targeting applications where every microamp and microvolt impacts runtime and signal fidelity.
FAQ
What is the exact output voltage of MAX8868EUK29 and how is it set?
The MAX8868EUK29 has a factory-preset output voltage of 2.84V with ±1.4% accuracy over -40°C to +85°C. This value is laser-trimmed during production and fixed internally - no external resistors or configuration pins are required. The "29" suffix in the part number directly corresponds to the 2.84V output code per Maxim's Expanded Ordering Information table.
Does MAX8868EUK29 require an external capacitor on the BP pin, and why?
Yes, MAX8868EUK29 requires a 0.01µF ceramic capacitor between BP and GND. This forms an 80Hz low-pass filter with an internal 200kΩ resistor to suppress bandgap reference noise, reducing total output noise to 30µVRMS. Omitting or undersizing this capacitor increases output noise; values above 0.1µF degrade startup time without improving noise performance.
How does the auto-discharge function work in MAX8868EUK29 during shutdown?
When SHDN is pulled low, MAX8868EUK29 activates an internal discharge switch connecting OUT to GND, sinking output current until VOUT reaches near-zero volts. This occurs independently of load capacitance and completes within microseconds - ensuring safe hot-swap compliance and preventing back-powering of upstream circuitry in PCMCIA or modular systems.
What protection features are integrated into MAX8868EUK29?
MAX8868EUK29 integrates thermal shutdown (155°C trigger, 20°C hysteresis), short-circuit current limiting (160–500mA range), and reverse battery protection (<1mA reverse current when VIN or SHDN < GND). These operate autonomously without external components, safeguarding the device and system during fault conditions including battery reversal, overtemperature, or output shorts.
Can MAX8868EUK29 be used with ceramic output capacitors, and what ESR range is stable?
Yes, MAX8868EUK29 is stable with ceramic output capacitors from 1µF to 10µF, provided ESR remains within the stable region shown in Figure 17 of the datasheet - typically <0.2Ω for 1µF and <0.05Ω for 10µF at 150mA load. X7R or X5R dielectrics are recommended; Z5U/Y5V types may require ≥2.2µF at low temperatures to maintain stability.
MAX8868EUK29 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
MAX8868EUK29 FAQ
1.How can I place an order for MAX8868EUK29 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8868EUK29 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 MAX8868EUK29 reliable?
The price and inventory of MAX8868EUK29 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8868EUK29 is usually 5 days.
3.What payment methods are accepted for MAX8868EUK29?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8868EUK29 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8868EUK29?
MAX8868EUK29 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8868EUK29 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 MAX8868EUK29?
For technical support, including MAX8868EUK29 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8868EUK29 requirements.
6.How does Aetrix verify that MAX8868EUK29 is sourced from the original manufacturer or authorized distributors?
All MAX8868EUK29 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 MAX8868EUK29 meets industry standards.
7.What is the process for return or replacement of MAX8868EUK29?
All MAX8868EUK29 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8868EUK29, 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 MAX8868EUK29 part is unused and in its original packaging.
Return procedure for MAX8868EUK29:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX8868EUK29 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
