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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Analog Devices Inc./Maxim Integrated MAX8868EUK32+

Name: MAX8868EUK32+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX8868EUK32+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX8868EUK32+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: SC-74A, SOT-753

Datasheet:: MAX8868EUK32+.pdf

Description:: IC REG LINEAR LOW NOISE LDO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MAX8868EUK32+ from Maxim Integrated is a low-noise, low-dropout linear regulator with preset 3.15V output, 150mA output current capability, 30µVRMS output noise, and 165mV dropout at full load - designed for battery-powered portable electronics requiring stable, clean power under light-to-moderate load conditions.

For engineers reviewing the MAX8868EUK32+ datasheet, MAX8868EUK32+ pinout, MAX8868EUK32+ application, or MAX8868EUK32+ equivalent, key selection criteria include its auto-discharge function, 10nA shutdown current, SOT23-5 package compatibility, and BP-pin noise-filtering architecture for ultra-low-noise operation in space-constrained designs.

Technical Context

The MAX8868EUK32+ uses an internal P-channel MOSFET pass transistor (1.1Ω typical R_DS(ON)) to achieve low quiescent current (100µA across all load and dropout conditions) and eliminate base-drive losses inherent 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.

Unlike the MAX8867, the MAX8868EUK32+ integrates an active auto-discharge circuit that pulls the OUT pin to GND during SHDN assertion via an internal NMOS switch (390Ω typical discharge resistance). It also includes reverse-battery protection limiting reverse current to ≤1mA when VIN or SHDN falls below GND.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.15V ±1.4% - factory-preset, eliminates external feedback resistors and ensures tight tolerance across -40°C to +85°C.
Max Output Current	150mA - sufficient for RF front-ends, microcontroller cores, and analog sensor rails in handheld devices.
Dropout Voltage	165mV at 150mA - enables operation down to 3.315V input when powering 3.15V loads, extending battery life in single-cell Li-ion or dual-cell alkaline systems.
Output Noise	30µV_RMS (10Hz–100kHz) - achieved using 0.01µF ceramic capacitor on BP pin; critical for noise-sensitive ADCs and RF synthesizers.
Shutdown Current	10nA - reduces standby power loss in always-on subsystems such as real-time clocks or wake-on-event circuits.
PSRR	63dB at 100Hz, rolling off above 10kHz - adequate for filtering switching supply ripple but not intended for high-frequency SMPS post-regulation.
Thermal Shutdown	Triggers at +155°C with +15°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up.

Pinout & Package

SOT23-5 regular package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body height, GND pin serves as thermal pad - requires soldering to ≥25mm² copper area for rated power dissipation (571mW at +70°C).

Pin/Terminal	Circuit Role	Design Meaning
1 - SHDN	Active-low enable/discharge control	Logic low disables regulation and activates internal NMOS discharge path to GND (MAX8868-specific); connect to IN for always-on operation.
2 - GND	Power ground and thermal sink	Reference node for all internal circuitry; must be connected to large PCB copper pour to maintain junction temperature < +150°C under 150mA load.
3 - IN	Input voltage supply	Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass capacitor (X5R/X7R, ESR < 0.2Ω) close to pin for stability and line-transient immunity.
4 - OUT	Regulated output	Delivers up to 150mA; requires ≥1µF output capacitor (10µF recommended) with ESR in stable region per load-current graph (Fig. MAX8867/8-17).
5 - BP	Noise-reduction bypass	Connects to internal 200kΩ resistor forming 80Hz low-pass filter; 0.01µF ceramic capacitor reduces output noise to 30µV_RMS; values >0.1µF increase startup time without benefit.

Key Features

Feature	Design Value
Auto-discharge function	Active NMOS discharge path (390Ω typ.) pulls OUT to GND within microseconds of SHDN assertion - prevents floating outputs and unintended biasing of downstream circuitry.
Reverse battery protection	Blocks reverse current to ≤1mA when VIN or SHDN < 0V - eliminates need for external series diode in battery-input applications, preserving forward voltage headroom.
P-channel MOSFET pass element	1.1Ω typical R_DS(ON) enables 100µA quiescent current independent of load or dropout - extends battery runtime in deep-sleep modes.
Internal current limit	390mA typical limit (160–500mA range) - allows indefinite short-circuit survival while maintaining safe junction temperature under thermal shutdown cycling.
BP-pin noise filtering	On-chip 200kΩ resistor + external 0.01µF capacitor forms dedicated noise-reduction path - isolates reference from supply noise without compromising regulation bandwidth.

Applications

Cellular Handset RF Power Amplifier Bias	Palmtop Computer Core Voltage Rail
Use Scenario: Providing clean, low-noise 3.15V bias to GaAs RF power amplifiers in GSM/EDGE handsets where supply ripple directly modulates output spectrum. IC Role / Device Role / Timing Role: Low-noise LDO delivering stable DC bias; BP-capacitor filtering suppresses switching noise from PMU DC-DC converters. Use Value: 30µV_RMS noise and 63dB PSRR at 100Hz prevent AM-to-PM conversion and adjacent-channel leakage, meeting 3GPP spectral mask requirements.	Use Scenario: Powering ARM7/ARM9 core logic in palmtop PCs during active and suspend states with minimal voltage droop and fast wake-up response. IC Role / Device Role / Timing Role: Primary core LDO with 10nA shutdown mode enabling zero-power retention of SRAM and real-time clock registers. Use Value: 100µA operating IQ and 10nA shutdown current extend battery life beyond 100 hours in suspend mode without compromising 150mA burst capability.
PCMCIA Card VCC Regulator	Electronic Planner LCD Backlight Driver Supply
Use Scenario: Generating regulated 3.15V for PCMCIA Type II card logic from variable host-supplied 3.3V–5.5V bus, surviving hot-insertion transients. IC Role / Device Role / Timing Role: Hot-swap tolerant LDO with reverse-battery protection and thermal shutdown - handles undershoot/overshoot during card insertion/removal. Use Value: Reverse-current blocking (<1mA) prevents backfeeding into host controller; 155°C thermal shutdown prevents damage during transient overloads.	Use Scenario: Supplying constant 3.15V to white LED driver ICs in electronic planners, where output ripple causes visible flicker in low-brightness modes. IC Role / Device Role / Timing Role: Low-noise, low-ESR output stage feeding boost converter input - minimizes input ripple-induced jitter in LED current regulation. Use Value: 30µV_RMS noise and <0.04%/mA load regulation ensure stable LED brightness across 0–150mA load range, eliminating perceptible flicker.

Cellular Handset RF Power Amplifier Bias

Palmtop Computer Core Voltage Rail

Use Scenario: Providing clean, low-noise 3.15V bias to GaAs RF power amplifiers in GSM/EDGE handsets where supply ripple directly modulates output spectrum.

IC Role / Device Role / Timing Role: Low-noise LDO delivering stable DC bias; BP-capacitor filtering suppresses switching noise from PMU DC-DC converters.

Use Value: 30µV_RMS noise and 63dB PSRR at 100Hz prevent AM-to-PM conversion and adjacent-channel leakage, meeting 3GPP spectral mask requirements.

Use Scenario: Powering ARM7/ARM9 core logic in palmtop PCs during active and suspend states with minimal voltage droop and fast wake-up response.

IC Role / Device Role / Timing Role: Primary core LDO with 10nA shutdown mode enabling zero-power retention of SRAM and real-time clock registers.

Use Value: 100µA operating IQ and 10nA shutdown current extend battery life beyond 100 hours in suspend mode without compromising 150mA burst capability.

PCMCIA Card VCC Regulator

Electronic Planner LCD Backlight Driver Supply

Use Scenario: Generating regulated 3.15V for PCMCIA Type II card logic from variable host-supplied 3.3V–5.5V bus, surviving hot-insertion transients.

IC Role / Device Role / Timing Role: Hot-swap tolerant LDO with reverse-battery protection and thermal shutdown - handles undershoot/overshoot during card insertion/removal.

Use Value: Reverse-current blocking (<1mA) prevents backfeeding into host controller; 155°C thermal shutdown prevents damage during transient overloads.

Use Scenario: Supplying constant 3.15V to white LED driver ICs in electronic planners, where output ripple causes visible flicker in low-brightness modes.

IC Role / Device Role / Timing Role: Low-noise, low-ESR output stage feeding boost converter input - minimizes input ripple-induced jitter in LED current regulation.

Use Value: 30µV_RMS noise and <0.04%/mA load regulation ensure stable LED brightness across 0–150mA load range, eliminating perceptible flicker.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX8867EUK32+	No auto-discharge; SHDN only disables regulation without discharging OUT.	Preferred where output must remain floating or be held by external circuitry during shutdown.	Select MAX8867EUK32+ if auto-discharge is unnecessary and pin compatibility with legacy MAX8863/64 designs is required.
Torex XC6206P312MR-G	3.1V output (±2%), 100mA max, 60µV_RMS noise, no BP pin or auto-discharge.	Lower cost for non-critical noise applications; lacks reverse-battery protection and thermal hysteresis.	Choose XC6206P312MR-G only for cost-sensitive, low-current applications where 30µV_RMS noise and reverse-battery protection are not required.

Compared with MAX8867EUK32+, the MAX8868EUK32+ adds essential auto-discharge for system-level power sequencing, while the Torex XC6206P312MR-G trades noise performance and protection features for lower unit cost and smaller footprint - making it suitable only for less demanding portable applications.

Availability

MAX8868EUK32+ is available at Aetrix Electronics and suitable for cellular telephones, palmtop computers, and PCMCIA cards requiring stable component supply, long-lifecycle support, and guaranteed parametric compliance across industrial temperature range (-40°C to +85°C).

Supply support for MAX8868EUK32+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MAX8867/MAX8868 product line was engineered specifically for ultra-low-noise, low-quiescent-current regulation in battery-powered portable electronics - prioritizing output stability, thermal resilience, and integrated protection over programmability or wide-input flexibility.

FAQ

What is the exact output voltage tolerance of the MAX8868EUK32+?

The MAX8868EUK32+ has a factory-preset output voltage of 3.15V with ±1.4% accuracy over the full operating temperature range (-40°C to +85°C) and line/load conditions. This specification is 100% production tested at +25°C and guaranteed across temperature via SQC correlation methods - ensuring consistent performance in battery-powered handheld devices without external trimming.

Does the MAX8868EUK32+ require an external capacitor on the BP pin?

Yes, the MAX8868EUK32+ requires a 0.01µF ceramic capacitor between BP and GND to achieve its specified 30µV_RMS output noise. This capacitor forms an 80Hz low-pass filter with an internal 200kΩ resistor. Using values larger than 0.1µF increases startup time without reducing noise further, and is not recommended per the datasheet's Shutdown Exit Delay characterization.

How does the auto-discharge function operate in the MAX8868EUK32+?

When the SHDN pin is pulled low, the MAX8868EUK32+ disables regulation and simultaneously activates an internal NMOS transistor connecting OUT to GND. This provides a 390Ω typical discharge path, pulling the output voltage to ground within microseconds - preventing residual charge from interfering with power sequencing or causing latch-up in downstream logic. The MAX8867EUK32+ lacks this feature.

Can the MAX8868EUK32+ be used with input voltages below 2.5V?

No, the MAX8868EUK32+ has an absolute minimum input voltage rating of 2.5V. Operation below this level risks improper regulation, increased dropout, or failure to maintain output voltage. Its specified input range is strictly 2.5V to 6.5V - making it unsuitable for single NiMH or single LiFePO₄ cells without pre-regulation, but ideal for single Li-ion (2.7–4.2V) or dual-alkaline (3.0–3.6V) sources.

What thermal derating applies to the MAX8868EUK32+ in SOT23-5 package?

In the SOT23-5 regular package, the MAX8868EUK32+ has a continuous power dissipation limit of 571mW at +70°C ambient, derating at 7.1mW/°C above that temperature. To sustain 150mA output at 3.15V with 3.3V input (225mW dissipation), a minimum 25mm² copper pour connected to the GND pin is required to maintain junction temperature below +150°C per JEDEC JESD51-7 standards.

MAX8868EUK32+ 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):: 3.2V

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

MAX8868EUK32+ FAQ

1.How can I place an order for MAX8868EUK32+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX8868EUK32+ 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 MAX8868EUK32+ reliable?

The price and inventory of MAX8868EUK32+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8868EUK32+ is usually 5 days.

3.What payment methods are accepted for MAX8868EUK32+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8868EUK32+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX8868EUK32+?

MAX8868EUK32+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX8868EUK32+ 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 MAX8868EUK32+?

For technical support, including MAX8868EUK32+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8868EUK32+ requirements.

6.How does Aetrix verify that MAX8868EUK32+ is sourced from the original manufacturer or authorized distributors?

All MAX8868EUK32+ 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 MAX8868EUK32+ meets industry standards.

7.What is the process for return or replacement of MAX8868EUK32+?

All MAX8868EUK32+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8868EUK32+, 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 MAX8868EUK32+ part is unused and in its original packaging.

Return procedure for MAX8868EUK32+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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