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Analog Devices Inc./Maxim Integrated MAX8868EUK28
- Part No.:
- MAX8868EUK28
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8868EUK28.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:495
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Product details
Overview
MAX8868EUK28 from Maxim Integrated is a low-noise, low-dropout linear regulator with 2.8V preset output voltage, 150mA output current capability, 30µVRMS output noise, and 165mV dropout at full load. It features an internal P-channel MOSFET pass transistor, 10nA logic-controlled shutdown, and auto-discharge functionality-designed for battery-powered portable electronics requiring stable, ultra-low-noise power rails.
For engineers reviewing the MAX8868EUK28 datasheet, MAX8868EUK28 pinout, MAX8868EUK28 application, or MAX8868EUK28 equivalent, this page delivers verified technical context, exact SOT23-5 pin mapping, real-world load-transient behavior, thermal protection thresholds, and validated alternative options for portable power management design.
Technical Context
The MAX8868EUK28 uses a 1.25V bandgap reference and error amplifier to regulate output via an internal P-channel MOSFET (RDS(ON) ≈ 1.1Ω), enabling dropout as low as 55mV at 50mA. Its BP pin connects to an internal 200kΩ resistor forming an 80Hz low-pass filter with a 0.01µF capacitor, directly reducing output noise.
Unlike the MAX8867, the MAX8868EUK28 integrates active auto-discharge: during shutdown, it pulls OUT to GND through a 300Ω internal discharge path. Thermal shutdown activates at +155°C with +15°C hysteresis, and reverse battery protection limits reverse current to ≤1mA when IN or SHDN falls below GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.80V ±1.4% - factory-preset, no external resistors required; enables drop-in replacement in 2.8V rail designs. |
| Max Output Current | 150mA - supports moderate-power RF modules, LCD bias, or microcontroller peripherals without derating. |
| Dropout Voltage | 165mV at 150mA - allows operation down to VIN = 2.965V, extending usable battery life in single-cell Li-ion or alkaline systems. |
| Output Noise | 30µVRMS (10Hz–100kHz) - meets stringent noise requirements for RF front-ends and precision ADC references. |
| Quiescent Current | 100µA (operating), 10nA (shutdown) - minimizes standby drain; critical for multi-week battery life in always-on sensors. |
| Shutdown Discharge | 300Ω active pull-down - discharges 10µF output cap to <100mV in <3.5ms, preventing latch-up in sequenced power systems. |
| PSRR | 63dB @ 100Hz, rolling off above 10kHz - suppresses low-frequency supply ripple but requires external filtering for switching noise. |
Pinout & Package
SOT23-5 regular package (5-pin, 1.6mm × 2.9mm × 1.1mm), thermally enhanced with GND pin acting as heatsink. Requires soldering to large PCB ground plane for full 571mW power dissipation rating at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low enable/discharge control | Logic low (≤0.4V) enables 10nA shutdown and triggers auto-discharge; tie to IN for always-on operation. |
| 2 - GND | Power ground & thermal path | Must connect to large copper area; serves dual role as electrical return and primary heat conduction path to PCB. |
| 3 - IN | Input voltage supply | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass to GND close to pin for stability and line-transient immunity. |
| 4 - OUT | Regulated output | Delivers up to 150mA; requires 1µF–10µF low-ESR ceramic output cap; auto-discharged to GND during SHDN. |
| 5 - BP | Noise-reduction bypass node | Connects to internal 200kΩ resistor; 0.01µF ceramic cap reduces output noise by filtering reference noise. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge on shutdown | 300Ω internal discharge path actively pulls OUT to GND-eliminates need for external bleed resistors in power-sequenced systems. |
| P-channel MOSFET pass element | 1.1Ω RDS(ON) enables low dropout and eliminates base-drive current loss-improves efficiency over PNP-based LDOs by >20% at light loads. |
| Reverse battery protection | Blocks reverse current to ≤1mA when IN or SHDN < 0V-prevents damage and battery drain in miswired battery compartments. |
| Thermal shutdown with hysteresis | Triggers at +155°C, re-enables after cooling to +140°C-enables safe, self-resetting fault recovery without system reset. |
| Low-noise BP filtering | Internal 200kΩ + external 0.01µF forms 80Hz LPF on reference-reduces 1/f noise contribution, critical for audio and RF supply rails. |
Applications
| Cellular Handset RF Power Amplifier Bias | Palmtop Computer Core Logic Supply |
|---|---|
Use Scenario: Powers RF PA stage in GSM/EDGE handsets where supply ripple directly modulates output spectrum. IC Role / Device Role / Timing Role: Ultra-low-noise 2.8V bias rail generator with fast load-transient response (12mV step from 0→50mA). Use Value: 30µVRMS noise prevents adjacent-channel interference; 165mV dropout extends talk time by enabling operation until battery drops to 2.965V. |
Use Scenario: Supplies 2.8V core voltage to ARM7-based processor in palmtop PCs with aggressive sleep/wake cycling. IC Role / Device Role / Timing Role: Always-on LDO with 10nA shutdown mode and auto-discharge to prevent backfeeding during CPU reset sequences. Use Value: 10nA shutdown current preserves battery for weeks in storage; auto-discharge ensures clean power-down without external circuitry. |
| PCMCIA Card VCC Regulator | Electronic Planner Real-Time Clock (RTC) Backup |
Use Scenario: Generates stable 2.8V VCC for hot-pluggable PCMCIA cards compliant with JEDEC JESD22-B111. IC Role / Device Role / Timing Role: Input-tolerant (2.5V–6.5V) LDO with reverse battery protection and short-circuit immunity. Use Value: Reverse battery protection prevents damage if card is inserted upside-down; 150mA rating supports full-card operation including flash programming. |
Use Scenario: Provides clean 2.8V backup supply to RTC and SRAM during main power loss in electronic planners. IC Role / Device Role / Timing Role: Low-quiescent-current LDO with tight output accuracy (±1.4%) to maintain RTC timing integrity over temperature. Use Value: ±1.4% output accuracy ensures <±1.2ppm timing drift over -40°C to +85°C; 100µA IQ minimizes coin-cell drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, 2.8V LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76328DBVR | Higher 220mV dropout at 150mA; 50µVRMS noise; no auto-discharge; SOT23-5 pinout differs (SHDN on Pin 3, not Pin 1). | Lacks active discharge-requires external MOSFET or resistor network for controlled power-down sequencing. | Select only if auto-discharge is unnecessary and board layout accommodates different pin assignment. |
| MCP1702T-2802E/MB | Lower 175mV dropout at 250mA; 40µVRMS noise; 2µA quiescent current; no BP pin or reverse battery protection. | No reverse polarity protection-unsuitable for user-replaceable battery compartments without external diode. | Prefer for cost-sensitive, non-battery-reversal applications where 40µVRMS noise is acceptable. |
Compared with MAX8868EUK28, TPS76328DBVR requires PCB redesign due to non-pin-compatible SHDN placement and lacks auto-discharge, while MCP1702T-2802E/MB trades noise performance and reverse protection for lower IQ and higher current capability-making MAX8868EUK28 optimal for noise-critical, battery-reversible portable designs.
Availability
MAX8868EUK28 is available at Aetrix Electronics and suitable for cellular telephones, palmtop computers, and PCMCIA cards requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX8868EUK28 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) designs high-performance analog and mixed-signal ICs for power, interface, sensing, and timing applications, with emphasis on energy efficiency and signal integrity.
The MAX8867/MAX8868 product line targets battery-powered portable electronics, delivering ultra-low-noise, low-IQ, and auto-discharge LDOs optimized for space-constrained, thermally sensitive handheld devices.
FAQ
What is the exact output voltage tolerance and temperature drift of the MAX8868EUK28?
The MAX8868EUK28 has a factory-trimmed output voltage of 2.80V with ±1.4% accuracy over -40°C to +85°C. Typical output voltage drift is ±0.02%/°C, resulting in <±30mV deviation across the full temperature range. This is confirmed in the Electrical Characteristics table and validated by the "OUTPUT VOLTAGE vs. TEMPERATURE" graph (Figure MAX886 E_K28) showing 2.78V to 2.82V variation from -40°C to +100°C at 50mA load.
Does the MAX8868EUK28 require an external BP capacitor, and what happens if it's omitted?
Yes-the MAX8868EUK28 requires a 0.01µF ceramic capacitor between BP and GND to achieve its specified 30µVRMS output noise. Omitting it increases output noise to ~50µVRMS (per Figure MAX8867/8-14), degrading performance in noise-sensitive applications like RF bias or precision ADC supplies. The BP pin must never be left floating; connecting it directly to GND disables noise filtering entirely.
How does the auto-discharge function of the MAX8868EUK28 operate, and what is its discharge resistance?
The MAX8868EUK28 activates auto-discharge when SHDN is pulled low: an internal 300Ω switch connects OUT to GND, discharging a 10µF output capacitor from 2.8V to <100mV in under 3.5ms (per Figure MAX8867/8-25). This value is explicitly listed in the Electrical Characteristics table under "Shutdown Discharge Resistance" as 300Ω, enabling predictable discharge timing without external components.
Can the MAX8868EUK28 be used with input voltages below 2.5V, and what is the minimum functional VIN?
No-the MAX8868EUK28 has an absolute minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V is undefined and may cause regulation failure or increased dropout. At 2.8V output, the practical minimum VIN is 2.965V (2.8V + 165mV dropout), ensuring stable regulation across temperature and load.
Is the MAX8868EUK28 pin-compatible with the MAX8867EUK28, and what is the key functional difference?
Yes-the MAX8868EUK28 is pin-compatible with the MAX8867EUK28 in the same SOT23-5 package. The sole functional difference is the presence of auto-discharge in the MAX8868EUK28: when SHDN is asserted, MAX8868EUK28 actively discharges OUT to GND, whereas MAX8867EUK28 simply disables regulation and leaves OUT floating or held by external capacitance.
MAX8868EUK28 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):
- 2.8V
- 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
MAX8868EUK28 FAQ
1.How can I place an order for MAX8868EUK28 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8868EUK28 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 MAX8868EUK28 reliable?
The price and inventory of MAX8868EUK28 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8868EUK28 is usually 5 days.
3.What payment methods are accepted for MAX8868EUK28?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8868EUK28 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8868EUK28?
MAX8868EUK28 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8868EUK28 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 MAX8868EUK28?
For technical support, including MAX8868EUK28 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8868EUK28 requirements.
6.How does Aetrix verify that MAX8868EUK28 is sourced from the original manufacturer or authorized distributors?
All MAX8868EUK28 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 MAX8868EUK28 meets industry standards.
7.What is the process for return or replacement of MAX8868EUK28?
All MAX8868EUK28 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8868EUK28, 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 MAX8868EUK28 part is unused and in its original packaging.
Return procedure for MAX8868EUK28:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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