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Analog Devices Inc./Maxim Integrated MAX8864REUK
- Part No.:
- MAX8864REUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8864REUK.pdf
- Description:
- LOW-DROPOUT, 120MA, LINEAR REGUL
- Quantity:
- Payment:
- Shipping:
Inventory:4,532
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Product details
Overview
MAX8864REUK from Maxim Integrated is a low-dropout linear regulator with PMOS pass transistor, delivering up to 120mA at a fixed 2.80V output. It operates from +2.5V to +6.5V input, features 55mV dropout at 50mA, 80μA operating supply current independent of load, and integrated auto-discharge during shutdown-ideal for battery-powered cordless phones and PCMCIA cards.
For engineers reviewing the MAX8864REUK datasheet, MAX8864REUK pinout, MAX8864REUK application, or MAX8864REUK equivalent, key selection criteria include its fixed 2.80V output, SOT23-5 package, thermal shutdown (170°C), reverse battery protection, and active output discharge-critical for portable equipment power integrity and battery longevity.
Technical Context
The MAX8864REUK uses an internal 1.25V bandgap reference and error amplifier to regulate output via a p-channel MOSFET pass transistor with typical RDS(ON) of 1.1Ω. Its Dual Mode™ comparator selects preset regulation (2.80V) when SET is grounded, eliminating external feedback components.
Shutdown logic disables all internal circuitry-including reference and bias networks-reducing supply current to 0.1nA; the MAX8864 variant uniquely activates a 300Ω discharge path from OUT to GND during shutdown, ensuring rapid output collapse without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.80V (±0.10V over -40°C to +85°C), enabling direct replacement of 2.8V rails without resistor tuning. |
| Dropout Voltage | 55mV at 50mA load-supports operation down to VIN = 2.855V, extending usable battery life in single-cell Li-ion or NiMH systems. |
| Supply Current | 80μA operating (load-independent), including dropout-minimizes quiescent drain during standby or light-load sleep modes. |
| Output Noise | 350μVRMS (10Hz–1MHz)-sufficient for powering analog sensors or 12-bit ADCs without additional LDO filtering. |
| Thermal Shutdown | Triggers at 170°C with 20°C hysteresis-prevents permanent damage during sustained overload or poor PCB heatsinking. |
| Reverse Battery Protection | Limits reverse current to <1mA if VIN or SHDN falls below GND-protects battery and upstream circuitry during incorrect insertion. |
| Auto-Discharge Resistance | 300Ω (MAX8864 only)-actively pulls output to GND in <200µs during shutdown, preventing floating voltage on downstream logic. |
Pinout & Package
MAX8864REUK is housed in a RoHS-compliant 5-pin SOT23 package (U5+1 outline), with GND serving dual electrical and thermal functions-requires soldering to large copper area for optimal θJA = 255.9°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low shutdown control | Pulls output to GND via internal 300Ω discharge path when low; connect to IN for normal operation. |
| 2 - GND | Power ground and thermal sink | Must be connected to large PCB copper pour to dissipate heat; critical for maintaining TJ ≤ 150°C at full load. |
| 3 - IN | Input voltage supply | Accepts +2.5V to +6.5V; requires ≥1µF ceramic bypass capacitor to GND for stability and transient immunity. |
| 4 - OUT | Regulated output | Delivers up to 120mA at 2.80V; requires ≥1µF ceramic capacitor with ESR < 0.2Ω for loop stability across temperature. |
| 5 - SET | Feedback mode selector | Grounded to enable fixed 2.80V output; floating or >60mV enables adjustable mode (not used in MAX8864REUK). |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Operation | Hardware-selectable fixed output (2.80V) eliminates need for external resistors-reduces BOM count and layout area in cost-sensitive designs. |
| Auto-Discharge Function | Internal 300Ω discharge path ensures rapid, controlled OUT-to-GND collapse during shutdown-avoids latch-up or false wake-up in downstream logic. |
| PMOS Pass Transistor | 1.1Ω typical RDS(ON) enables ultra-low dropout and eliminates base-drive current-maintains 80μA IQ regardless of load or dropout condition. |
| Reverse Battery Protection | Active polarity monitoring disconnects internal paths when VIN or SHDN < GND-prevents >1mA reverse current, protecting battery chemistry and system safety. |
| Thermal Hysteresis | 20°C gap between shutdown activation (170°C) and recovery-ensures stable oscillation-free restart after cooling, avoiding repeated thermal cycling damage. |
Applications
| Cordless Telephones | PCMCIA Cards |
|---|---|
Use Scenario: Powering RF front-end ICs and microcontroller peripherals in compact cordless handsets with single-cell NiMH battery. IC Role / Device Role / Timing Role: Primary 2.80V LDO supplying core logic and analog sections, replacing discrete regulators with tighter tolerance and lower noise. Use Value: 55mV dropout extends usable battery range by ~150mV per cell; 350μVRMS noise prevents spurious RF interference in sensitive receive paths. |
Use Scenario: Providing clean, regulated 2.80V to memory and interface controllers in hot-pluggable PCMCIA Type II cards. IC Role / Device Role / Timing Role: Local point-of-load regulator with fast auto-discharge to prevent back-powering host slots during card removal. Use Value: 300Ω internal discharge path clears OUT to GND in <200µs-meets PCMCIA hot-swap timing requirements without external FET or RC network. |
| Cellular Telephones | Hand-Held Instruments |
Use Scenario: Supplying display driver and sensor interface circuits in early GSM handsets with tight board space constraints. IC Role / Device Role / Timing Role: Compact SOT23-5 LDO delivering stable 2.80V rail with minimal external components-enables high-density component placement. Use Value: 80μA load-independent quiescent current preserves standby time; reverse battery protection avoids field failures from user-insertion errors. |
Use Scenario: Regulating power to precision ADCs and op-amp signal chains in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Low-noise 2.80V source for analog front-ends, where PSRR and spectral purity directly impact measurement accuracy. Use Value: 350μVRMS noise and 62dB PSRR at DC ensure <0.01% error contribution to 12-bit conversions-eliminates need for secondary filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout, fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76328DBVR | Fixed 2.8V output, 150mA rating, 120mV dropout at 150mA, no auto-discharge, higher 85μA IQ. | Lacks active output discharge-requires external circuitry for hot-swap compliance in PCMCIA or modular systems. | Select when higher output current headroom is needed and auto-discharge is not required. |
| MCP1700T-2802E/TT | Fixed 2.8V output, 250mA rating, 600mV dropout at 250mA, 1.6μA IQ, no thermal shutdown or reverse battery protection. | Optimized for ultra-low IQ in always-on sensors-not suitable for 120mA pulsed loads or harsh reverse-polarity environments. | Select for battery-life-critical IoT endpoints where load current rarely exceeds 25mA and reverse protection is externally managed. |
Compared with TPS76328DBVR and MCP1700T-2802E/TT, MAX8864REUK uniquely combines 2.80V precision, 55mV ultra-low dropout, active auto-discharge, and integrated reverse battery/thermal protection-making it the only choice for space-constrained, safety-critical portable equipment requiring guaranteed output collapse and robust fault handling.
Availability
MAX8864REUK is available at Aetrix Electronics and suitable for cordless telephones, PCMCIA cards, and handheld instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8864REUK 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX8863/MAX8864 family was designed specifically for battery-powered portable electronics requiring ultra-low IQ, small footprint, and robust fault protection-targeting cellular, cordless, and modular computing platforms.
FAQ
What output voltage does the MAX8864REUK deliver?
The MAX8864REUK delivers a factory-trimmed fixed output voltage of 2.80V, with tolerance of ±0.10V over the full operating temperature range (-40°C to +85°C). This value is set internally and requires no external resistors-SET must be connected to GND to activate the preset mode. The MAX8864REUK does not support adjustable output configuration.
Does the MAX8864REUK include auto-discharge functionality?
Yes, the MAX8864REUK includes active auto-discharge: when the SHDN pin is pulled low, an internal 300Ω switch connects the OUT pin to GND, collapsing the output voltage to ground within 200µs. This feature is exclusive to the MAX8864 series (not present in MAX8863) and is confirmed in the Electrical Characteristics table under "Shutdown Discharge Resistance."
What is the maximum continuous output current for the MAX8864REUK?
The MAX8864REUK is rated for a maximum continuous output current of 120mA under specified thermal conditions (multilayer board, TA = +70°C). Its current limit circuit triggers at approximately 280mA, but design margin should be based on the 120mA guaranteed output-exceeding this requires derating per the thermal resistance (θJA = 255.9°C/W) and ambient temperature.
How does reverse battery protection work in the MAX8864REUK?
The MAX8864REUK monitors polarity on both IN and SHDN pins; if either falls below GND, internal circuitry disconnects parasitic paths and limits reverse current to less than 1mA. This protects the battery from excessive discharge and prevents damage to upstream power sources-verified in Absolute Maximum Ratings and Applications Information sections of the datasheet.
What package type and footprint does the MAX8864REUK use?
The MAX8864REUK uses a lead(Pb)-free, RoHS-compliant 5-pin SOT23 package (outline U5+1, land pattern 90-0174). Its compact 2.9mm × 1.6mm footprint and GND-as-thermal-sink design require connection to a large PCB copper area for thermal performance-confirmed in Package Information and Thermal Characteristics sections.
MAX8864REUK 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:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 1.25V (2.8V)
- Voltage - Output (Max):
- 6.5V
- Voltage Dropout (Max):
- 0.12V @ 50mA
- Current - Output:
- 120mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- 80 µA
- PSRR:
- 62dB (300Hz)
- 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
MAX8864REUK FAQ
1.How can I place an order for MAX8864REUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8864REUK 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 MAX8864REUK reliable?
The price and inventory of MAX8864REUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8864REUK is usually 5 days.
3.What payment methods are accepted for MAX8864REUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8864REUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8864REUK?
MAX8864REUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8864REUK 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 MAX8864REUK?
For technical support, including MAX8864REUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8864REUK requirements.
6.How does Aetrix verify that MAX8864REUK is sourced from the original manufacturer or authorized distributors?
All MAX8864REUK 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 MAX8864REUK meets industry standards.
7.What is the process for return or replacement of MAX8864REUK?
All MAX8864REUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX8864REUK, 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 MAX8864REUK part is unused and in its original packaging.
Return procedure for MAX8864REUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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