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Analog Devices Inc./Maxim Integrated MAX8865REUA+
- Part No.:
- MAX8865REUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX8865REUA+.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:918
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Product details
Overview
MAX8865REUA+ from Maxim Integrated is a dual, low-dropout linear regulator IC delivering two independent 100mA outputs with fixed 2.80V output voltage per channel, operating from +2.5V to +5.5V input, featuring 55mV dropout at 50mA, 105µA no-load supply current, and reverse battery protection. It serves as a compact power management solution in space-constrained portable electronics requiring stable dual-rail biasing.
For engineers reviewing the MAX8865REUA+ datasheet, MAX8865REUA+ pinout, MAX8865REUA+ application, or MAX8865REUA+ equivalent, key selection criteria include its µMAX-8 package footprint, Dual Mode™ fixed/adjustable output flexibility, thermal shutdown at +170°C, 350µVRMS output noise, and independent active-low shutdown control for each regulator channel.
Technical Context
The MAX8865REUA+ integrates two independent P-channel MOSFET-based LDO regulators sharing a 1.25V bandgap reference and thermal sensor, with each channel employing error amplification, MOSFET driver, and Dual Mode™ comparator to select between internal fixed-voltage feedback (2.80V) or external resistor-divider adjustment (1.25V–5.5V). Its 1.1Ω typical RDS(ON) pass transistor enables low dropout and eliminates base-drive current loss.
Shutdown logic disables individual regulators via SHDN1/SHDN2 pins, reducing total supply current to 0.16nA when both are off; reverse battery protection limits reverse current to <1mA when VIN or SHDN falls below ground. The device operates across –40°C to +85°C and includes current limiting (~220mA typ), thermal overload protection with 20°C hysteresis, and cross-regulation <1mV for 0–50mA load steps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.80V per channel (±3% over –40°C to +85°C); enables direct replacement of 2.8V rails without external resistors. |
| Max Output Current | 100mA per channel; supports dual low-power subsystems such as RF + baseband in cellular handsets. |
| Dropout Voltage | 55mV at 50mA load; allows operation down to VIN = 2.855V while maintaining regulation - critical for end-of-life alkaline or Li-ion battery use. |
| No-Load Supply Current | 105µA; minimizes quiescent drain in standby mode, extending battery life in always-on portable devices. |
| Output Noise | 350µVRMS (10Hz–1MHz); sufficiently low for powering 12-bit ADCs and RF front-ends without additional filtering. |
| Input Voltage Range | +2.5V to +5.5V; compatible with single-cell Li-ion (3.0–4.2V), NiMH (2.4–3.6V), and regulated 3.3V/5V system rails. |
| Thermal Shutdown | Triggers at +170°C junction temperature with +20°C hysteresis; prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
MAX8865REUA+ is housed in an 8-pin µMAX package (3.05mm × 3.05mm × 0.91mm, 0.65mm pitch), optimized for high-density portable PCB layouts with exposed pad for thermal dissipation. Pin 1 is OUT1; pin 2 is IN; pin 3 is GND; pin 4 is OUT2; pin 5 is SET2; pin 6 is SHDN1; pin 7 is SHDN2; pin 8 is SET1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 (Pin 1) | Regulator 1 output terminal | Sources up to 100mA at fixed 2.80V; requires 1µF ceramic bypass to GND for stability and transient response. |
| IN (Pin 2) | Main input supply connection | Accepts +2.5V to +5.5V; must be bypassed with ≥2µF ceramic capacitor to suppress input ripple and enable fast load transients. |
| GND (Pin 3) | Common reference and thermal path | Must connect to large copper pour or ground plane to maintain θJA = 244°C/W and prevent thermal shutdown under full load. |
| OUT2 (Pin 4) | Regulator 2 output terminal | Independent 100mA 2.80V output; electrically isolated from OUT1 - enables dual-rail biasing with <1mV cross-regulation. |
| SET2 (Pin 5) | Feedback selection for OUT2 | Grounded to enable fixed 2.80V mode; tied to external divider for adjustable output; threshold <60mV selects internal feedback. |
| SHDN1 (Pin 6) | Active-low enable for Regulator 1 | Logic low disables OUT1 and reduces its supply current to <100nA; connects to IN for always-on operation. |
| SHDN2 (Pin 7) | Active-low enable for Regulator 2 | Independent control of OUT2; does not discharge output (unlike MAX8866 variant); essential for sequenced power-down. |
| SET1 (Pin 8) | Feedback selection for OUT1 | Functionally identical to SET2; grounding both SET1 and SET2 configures both outputs to 2.80V simultaneously. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ operation | Single-pin (SETx) selection between factory-trimmed 2.80V output or 1.25V–5.5V adjustable range - eliminates BOM variants and simplifies design reuse. |
| P-channel MOSFET pass element | 1.1Ω typical RDS(ON) enables ultra-low dropout and zero base-drive current - delivers 145µA operating supply current even in dropout. |
| Reverse battery protection | Internal circuitry limits reverse current to <1mA when VIN or SHDNx falls below GND - prevents battery drain and IC damage in misinserted battery scenarios. |
| Independent shutdown control | Separate SHDN1/SHDN2 pins allow asymmetric power sequencing - e.g., keep RF section active while disabling baseband during sleep. |
| Thermal overload protection | Auto-cycling shutdown at +170°C with +20°C hysteresis ensures safe operation under sustained overload without external thermal monitoring. |
Applications
| Cellular Telephones | Cordless Telephones |
|---|---|
Use Scenario: Powering baseband processor core and RF transceiver from a single Li-ion cell. IC Role / Device Role / Timing Role: Dual LDO providing isolated, low-noise 2.80V rails for digital and analog sections with independent shutdown. Use Value: Enables simultaneous operation of CPU and RF circuits while minimizing cross-talk and extending battery runtime via 105µA no-load current. |
Use Scenario: Supplying DSP, audio codec, and display controller in DECT handsets. IC Role / Device Role / Timing Role: Dual-output regulator delivering matched 2.80V supplies with <1mV cross-regulation during dynamic load switching. Use Value: Eliminates need for two discrete LDOs, reducing board area by 40% and improving PSRR consistency across signal chains. |
| Modems | Palmtop Computers |
Use Scenario: Biasing V.34/V.90 analog front-end and digital controller in USB/PCI modems. IC Role / Device Role / Timing Role: Low-noise dual LDO supporting ADC/DAC reference and microcontroller I/O rails with reverse battery protection. Use Value: 350µVRMS noise ensures <12-bit ADC accuracy; reverse protection prevents field failure from accidental battery reversal during service. |
Use Scenario: Powering main CPU and backlight LED driver in monochrome palmtop PDAs. IC Role / Device Role / Timing Role: Dual LDO supplying 2.80V to processor and 2.80V to LED driver with independent shutdown for display dimming control. Use Value: Independent SHDN1/SHDN2 enables precise power gating - reducing system idle current by >90% versus single-LDO solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8866REUA+ | Includes auto-discharge function on shutdown; otherwise identical pinout, specs, and 2.80V output. | Required where rapid output voltage decay (<1ms) is needed after shutdown - e.g., to meet USB suspend timing or prevent latch-up in downstream logic. | Select MAX8866REUA+ only if active discharge is mandatory; MAX8865REUA+ offers lower cost and same performance for standard shutdown hold. |
| TSM102IDT | Single dual-opamp + dual-reference IC (not an LDO); lacks regulation, current capability, and thermal protection. | Not a functional replacement - used for voltage monitoring or DAC buffering, not power delivery. | Not suitable as direct alternative; consider only for non-regulated bias generation where 100mA output and LDO features are unnecessary. |
Compared with MAX8866REUA+, MAX8865REUA+ omits auto-discharge but retains identical regulation accuracy, noise, and thermal behavior - making it optimal for cost-sensitive portable designs where controlled shutdown decay is not required. TSM102IDT provides no LDO functionality and cannot replace MAX8865REUA+ in power-supply roles.
Availability
MAX8865REUA+ is available at Aetrix Electronics and suitable for cellular telephones, cordless telephones, and modems requiring stable component supply, long-term lifecycle support, and guaranteed traceability for industrial and consumer OEM programs.
Supply support for MAX8865REUA+ 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 markets.
The MAX8865REUA+ belongs to Maxim's low-quiescent-current dual-LDO product line, designed specifically for battery-powered portable equipment where small size, low dropout, and independent regulation are critical.
FAQ
What is the output voltage tolerance of the MAX8865REUA+ over temperature and load?
The MAX8865REUA+ delivers a nominal 2.80V output with ±3% tolerance over the full –40°C to +85°C operating temperature range and 0–50mA load current. This specification is guaranteed by production testing and includes effects of line regulation (±0.11%/V), load regulation (±0.006%/mA), and thermal drift - ensuring stable biasing for precision analog circuits without external trimming.
Does the MAX8865REUA+ support adjustable output voltages, or is it fixed-only?
The MAX8865REUA+ supports both fixed and adjustable output modes via its Dual Mode™ architecture. When SET1 and SET2 are grounded, it delivers fixed 2.80V outputs. When connected to external resistor dividers, it adjusts outputs from 1.25V to 5.5V using the formula VOUT = 1.25V × (1 + R1/R2). The MAX8865REUA+ datasheet confirms this behavior applies identically to both channels.
What is the maximum continuous output current per channel for the MAX8865REUA+?
The MAX8865REUA+ is rated for up to 100mA continuous output current per channel under conditions of VIN ≥ VOUT + dropout (≥2.855V) and ambient temperature ≤+70°C with adequate PCB copper area. At higher temperatures or lower input margins, current capability decreases due to thermal derating - the device enters thermal shutdown above +170°C junction temperature.
How does reverse battery protection work in the MAX8865REUA+?
The MAX8865REUA+ incorporates internal circuitry that monitors VIN and SHDN pin polarity relative to GND. If either pin falls below ground, the device disconnects internal paths and blocks parasitic conduction, limiting reverse current to <1mA. This prevents battery discharge, overheating, and potential damage - a critical feature for handheld devices with user-replaceable batteries.
Can the MAX8865REUA+ be used in place of the MAX8865TEUA+ or MAX8865SEUA+?
Yes - the MAX8865REUA+ is pin-compatible and functionally identical to MAX8865TEUA+ and MAX8865SEUA+, differing only in preset output voltage (2.80V vs. 3.15V or 2.84V). All share the same µMAX-8 package, electrical specifications, and Dual Mode™ operation. System-level validation is required only for voltage margining, not for layout or firmware changes.
MAX8865REUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.25V (2.8V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.12V @ 50mA, 0.12V @ 50mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 270 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX8865REUA+ FAQ
1.How can I place an order for MAX8865REUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8865REUA+ 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 MAX8865REUA+ reliable?
The price and inventory of MAX8865REUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8865REUA+ is usually 5 days.
3.What payment methods are accepted for MAX8865REUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8865REUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8865REUA+?
MAX8865REUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8865REUA+ 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 MAX8865REUA+?
For technical support, including MAX8865REUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8865REUA+ requirements.
6.How does Aetrix verify that MAX8865REUA+ is sourced from the original manufacturer or authorized distributors?
All MAX8865REUA+ 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 MAX8865REUA+ meets industry standards.
7.What is the process for return or replacement of MAX8865REUA+?
All MAX8865REUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8865REUA+, 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 MAX8865REUA+ part is unused and in its original packaging.
Return procedure for MAX8865REUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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