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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 LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:5,631
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Product details
Overview
MAX8865REUA from Maxim Integrated is a dual, low-dropout linear regulator IC delivering two independent 2.80V outputs at up to 100mA each, operating from +2.5V to +5.5V input. It features PMOS pass transistors (1.1Ω typical RDS(ON)), 55mV dropout at 50mA, 145µA operating supply current, and reverse battery protection - designed for space-constrained, battery-powered portable systems including cellular phones and PCMCIA cards.
For engineers reviewing the MAX8865REUA datasheet, MAX8865REUA pinout, MAX8865REUA application, or MAX8865REUA equivalent, key selection criteria include fixed 2.80V dual-output capability, µMAX-8 package footprint, independent active-low shutdown control per channel, thermal shutdown at +170°C, and Dual Mode™ operation enabling either preset or adjustable output configuration.
Technical Context
The MAX8865REUA integrates two independent linear regulators sharing a 1.25V bandgap reference and thermal sensor, each with its own error amplifier, MOSFET driver, P-channel pass transistor, and Dual Mode comparator. The SET1/SET2 pins determine feedback path selection: grounding them enables fixed 2.80V regulation via internal trimmed resistors; external resistor dividers enable adjustable 1.25V–5.5V outputs.
Each regulator includes independent current limiting (~220mA typical), short-circuit protection with infinite duration tolerance, and reverse battery protection limiting reverse current to <1mA. Unlike the MAX8866, the MAX8865REUA lacks auto-discharge functionality - shutdown disables the selected regulator but does not actively pull its output to ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.80V per channel (±3% over -40°C to +85°C), set by internal feedback when SET1/SET2 = GND |
| Max Output Current | 100mA per channel - supports dual-rail power for baseband processors and RF front-ends in handheld devices |
| Dropout Voltage | 55mV at 50mA load - enables operation down to VIN = 2.855V while maintaining regulation at 2.80V |
| Supply Current | 145µA total at 200mA combined load - ensures minimal quiescent drain during active operation, even in dropout |
| Input Voltage Range | +2.5V to +5.5V - compatible with single Li-ion, Li-polymer, or 3-cell NiMH battery inputs |
| Thermal Shutdown | Triggers at +170°C junction temperature with 20°C hysteresis - protects against sustained overload without PCB-level thermal design overhead |
| Reverse Battery Protection | Limits reverse current to <1mA when VIN or SHDNx falls below GND - prevents battery damage and IC overheating in miswired installations |
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. Thermal performance is enhanced by direct soldering of the exposed GND pad to the board's ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 (Pin 1) | Regulator 1 output | Delivers up to 100mA at 2.80V; requires 1µF ceramic bypass capacitor to GND for stability |
| IN (Pin 2) | Input supply rail | Accepts +2.5V to +5.5V; requires 2µF ceramic bypass capacitor to GND near pin |
| GND (Pin 3) | Power and signal reference | Common return for both regulators; must be connected to large copper area for thermal dissipation |
| OUT2 (Pin 4) | Regulator 2 output | Independent 100mA, 2.80V output; identical bypassing requirement as OUT1 |
| SET2 (Pin 5) | Feedback select for OUT2 | Ground to enable fixed 2.80V mode; connect to external divider for adjustable output (1.25V–5.5V) |
| SET1 (Pin 6) | Feedback select for OUT1 | Ground to enable fixed 2.80V mode; functionally identical to SET2 |
| SHDN1 (Pin 7) | Active-low enable for OUT1 | Pull low to disable OUT1; pulls regulator into ultra-low-IQ state (<0.16nA) when both SHDNx are low |
| SHDN2 (Pin 8) | Active-low enable for OUT2 | Independent control of OUT2; no auto-discharge - unlike MAX8866, output floats in shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ operation | Single-pin (SETx) selection between factory-trimmed 2.80V output or externally adjustable 1.25V–5.5V range - eliminates need for separate fixed/adjustable SKUs |
| P-channel MOSFET pass transistors | 1.1Ω typical RDS(ON) enables 55mV dropout at 50mA and eliminates base-drive current - reduces IQ vs. PNP-based LDOs by >50% |
| Independent shutdown control | SHDN1/SHDN2 allow selective powering of subsystems (e.g., RF vs. baseband) without affecting the other rail - critical for dynamic power management |
| Reverse battery protection | Internal circuitry disconnects parasitic paths when VIN or SHDNx < GND - prevents >1mA reverse current and avoids external diode losses |
| Low-noise regulation | 350µVRMS output noise (10Hz–1MHz) supports analog-sensitive loads like 12-bit+ ADCs and VCOs without additional filtering |
Applications
| Cellular Telephones | Cordless Telephones |
|---|---|
|
Use Scenario: Powering RF transceiver and baseband processor cores from a single Li-ion cell. IC Role / Device Role / Timing Role: Dual-rail LDO providing isolated, low-noise 2.80V supplies for analog RF section and digital baseband logic. Use Value: 55mV dropout extends usable battery life by enabling regulation until cell voltage drops to 2.855V; independent shutdown allows RF section to sleep while baseband remains active. |
Use Scenario: Supplying DSP, codec, and display drivers in DECT 6.0 cordless handsets. IC Role / Device Role / Timing Role: Dual-output regulator delivering matched 2.80V rails for mixed-signal processing and peripheral interfaces. Use Value: 145µA total operating current minimizes standby drain; reverse battery protection guards against user-insertion errors in replaceable battery compartments. |
| PCMCIA Cards | Palmtop Computers |
|
Use Scenario: Generating clean 2.80V for card controller and interface logic in hot-pluggable PCMCIA Type II slots. IC Role / Device Role / Timing Role: Dual LDO ensuring stable voltage during insertion/removal transients and bus voltage fluctuations. Use Value: 200mA total current capacity supports peak loads during data transfer; µMAX-8 package fits tight card-edge spacing constraints. |
Use Scenario: Powering CPU core and memory subsystems in compact palmtop PDAs with limited board area. IC Role / Device Role / Timing Role: Dual 2.80V regulator enabling independent power gating of processor and SRAM banks. Use Value: Independent SHDN1/SHDN2 pins allow dynamic rail disabling to reduce system-wide leakage; thermal shutdown prevents overheating during extended use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8866REUA | Includes auto-discharge on shutdown (actively pulls OUTx to GND); otherwise identical pinout, specs, and package | Required where rapid output discharge is needed (e.g., to meet reset timing or prevent back-powering of upstream circuitry) | Select MAX8866REUA only if auto-discharge is mandatory; MAX8865REUA offers lower cost and same regulation performance without it |
| TSM1024IDT | Single 2.8V output (not dual), SO-8 package, higher 250µA quiescent current, no reverse battery protection | Suitable for simpler systems needing only one regulated rail and lacking reverse polarity risk | Use TSM1024IDT only when dual outputs are unnecessary and board space allows SO-8; MAX8865REUA provides true dual-rail integration in smaller µMAX footprint |
Compared with MAX8866REUA, the MAX8865REUA trades auto-discharge capability for cost and simplicity in applications where output floating in shutdown is acceptable. Against TSM1024IDT, it delivers twice the output channels, 42% lower IQ, and integrated reverse polarity protection - justifying its use in compact, battery-critical dual-rail designs.
Availability
MAX8865REUA is available at Aetrix Electronics and suitable for cellular telephones, PCMCIA cards, and palmtop computers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing for production 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 applications.
The MAX8865REUA belongs to Maxim's low-dropout linear regulator product line, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, small footprint, and robust protection features.
FAQ
What output voltage does the MAX8865REUA deliver?
The MAX8865REUA delivers two independent, factory-trimmed 2.80V outputs (±3% over -40°C to +85°C) when SET1 and SET2 pins are grounded. This fixed voltage is specific to the "R" suffix variant and cannot be altered without reconfiguring to adjustable mode using external resistors - which would change the output from 2.80V.
Does the MAX8865REUA support adjustable output voltages?
Yes, the MAX8865REUA supports adjustable outputs from 1.25V to 5.5V per channel via external resistor dividers connected to SET1 and SET2. In this mode, the internal 2.80V trim is disabled. The output is calculated as VOUT = 1.25V × (1 + R1/R2), with R2 typically set to 100kΩ for optimal accuracy and PSRR.
How does shutdown work on the MAX8865REUA?
The MAX8865REUA features independent active-low shutdown: pulling SHDN1 low disables OUT1, and pulling SHDN2 low disables OUT2. When both are low, total supply current drops to ~0.16nA. Unlike the MAX8866REUA, the MAX8865REUA does not provide auto-discharge - outputs float rather than being actively pulled to ground during shutdown.
What protection features does the MAX8865REUA include?
The MAX8865REUA includes thermal shutdown (trips at +170°C with 20°C hysteresis), short-circuit protection (infinite duration tolerance), output current limiting (~220mA typical), and reverse battery protection (limits reverse current to <1mA when VIN or SHDNx falls below GND). It does not include output auto-discharge or input overvoltage protection.
Is the MAX8865REUA pin-compatible with other variants in the family?
Yes, all MAX8865T/S/R and MAX8866T/S/R variants share identical 8-pin µMAX pinouts and electrical interfaces. The "R" suffix denotes 2.80V fixed output, "S" is 2.84V, and "T" is 3.15V. Functionally, MAX8865REUA is pin-compatible with MAX8865SEUA and MAX8865TEUA - only the preset output voltage differs; all other specifications and pin functions remain unchanged.
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:
- Bulk
- 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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