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Analog Devices Inc./Maxim Integrated MAX8868EZK28+T
- Part No.:
- MAX8868EZK28+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8868EZK28+T.pdf
- Description:
- IC REG LIN 2.8V 150MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,926
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Product details
Overview
MAX8868EZK28+T from Maxim Integrated is a low-noise, low-dropout linear regulator with 2.8V preset output voltage, 150mA maximum output current, 30µVRMS output noise, and 165mV dropout at full load. It features auto-discharge on shutdown, reverse battery protection, and operates from 2.5V to 6.5V input - designed for space-constrained, battery-powered portable electronics requiring stable low-noise power.
For engineers reviewing the MAX8868EZK28+T datasheet, MAX8868EZK28+T pinout, MAX8868EZK28+T application, or MAX8868EZK28+T equivalent, key selection criteria include its thin SOT23-5 package, 10nA shutdown current, BP-pin noise filtering capability, thermal/short-circuit protection, and auto-discharge behavior unique to the MAX8868 variant.
Technical Context
The MAX8868EZK28+T uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling ultra-low quiescent current (100µA across load and dropout conditions) and eliminating base-drive losses inherent in PNP-based regulators. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to OUT.
Unlike the MAX8867, the MAX8868EZK28+T integrates active auto-discharge via an internal NMOS switch between OUT and GND during SHDN assertion, reducing output decay time significantly. The BP pin connects to an internal 200kΩ resistor forming an 80Hz low-pass filter with an external 0.01µF capacitor to suppress reference noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.8V ±1.4% - factory-preset, eliminates external feedback resistors and layout sensitivity. |
| Max Output Current | 150mA - sufficient for RF front-ends, microcontrollers, and analog sensors in handheld devices. |
| Dropout Voltage | 165mV at 150mA - enables operation down to ~2.965V input when powering 2.8V rail, extending battery life. |
| Output Noise | 30µVRMS (10Hz–100kHz) - low enough for noise-sensitive ADCs, PLLs, and RF ICs without additional LDO staging. |
| Shutdown Current | 10nA - reduces system standby power by >4× versus typical 50nA LDOs, critical for long-term battery retention. |
| Auto-Discharge | Active NMOS discharge path - pulls OUT to GND within microseconds of SHDN assertion, preventing floating outputs or unintended wake-up. |
| Input Voltage Range | 2.5V to 6.5V - supports single Li-ion, dual Alkaline/NiMH, or regulated 3.3V/5V supplies without derating. |
Pinout & Package
SOT23-5 thin package (1.6mm × 2.9mm × 1.1mm height), thermally enhanced with GND pin serving as heatsink - requires soldering to PCB ground plane for optimal thermal performance and power dissipation up to 727mW 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; must be pulled high (≥2.0V) for regulation. |
| 2 - GND | Power ground & thermal path | Reference node for all internal circuitry; primary heat conduction path - requires large copper area for thermal management. |
| 3 - IN | Input supply connection | Accepts 2.5V–6.5V; bypassed with ≥1µF ceramic capacitor to suppress line noise and improve transient response. |
| 4 - OUT | Regulated output terminal | Delivers up to 150mA at 2.8V; requires ≥1µF low-ESR output capacitor for stability and load-transient suppression. |
| 5 - BP | Noise-reduction bypass node | Connects to internal 200kΩ resistor; 0.01µF ceramic capacitor here reduces output noise by filtering reference voltage ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 30µVRMS output noise with 0.01µF BP cap - enables clean power for precision analog and RF circuits without extra filtering. |
| P-channel pass transistor | 1.1Ω typical RDS(ON) - delivers consistent 100µA quiescent current regardless of load or dropout, maximizing battery runtime. |
| Auto-discharge function | Internal NMOS switch discharges OUT to GND in <100µs upon SHDN assertion - prevents latch-up and ensures deterministic system reset. |
| Reverse battery protection | Limits reverse current to ≤1mA if VIN or SHDN falls below GND - protects device and downstream circuitry during battery insertion errors. |
| Thermal & short-circuit protection | Shuts down at +170°C junction temperature with 20°C hysteresis; survives indefinite output short to GND - ensures robustness in unattended operation. |
Applications
| Cellular Handset Power | PCMCIA Card Regulation |
|---|---|
Use Scenario: Powers baseband processor core voltage (2.8V) in GSM/CDMA handsets using single Li-ion battery. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 2.8V rail with fast load-transient response to handle burst-mode TX current spikes. Use Value: 165mV dropout extends usable battery range to ~2.965V; 30µVRMS noise avoids corruption of sensitive RF receive paths. | Use Scenario: Supplies regulated 2.8V to PCMCIA card logic and interface circuitry in laptops and PDAs. IC Role / Device Role / Timing Role: Local point-of-load regulator isolating card from noisy host bus voltage; enabled/disabled via host-controlled SHDN signal. Use Value: 10nA shutdown current minimizes card leakage during sleep; auto-discharge prevents back-powering host slots during hot-swap removal. |
| Palmtop Computer Core Rail | Hand-Held Instrument Analog Front-End |
Use Scenario: Provides 2.8V core supply to ARM7-based palmtop CPU and SRAM during active and standby modes. IC Role / Device Role / Timing Role: Main system LDO with tight output accuracy (±1.4%) and low quiescent current to sustain multi-week battery life. Use Value: 100µA operating IQ - independent of load or dropout - ensures predictable battery modeling and no runtime penalty at light loads. | Use Scenario: Powers 2.8V analog section (op-amps, ADC drivers, sensor interfaces) in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Low-noise local regulator decoupling analog circuitry from digital switching noise on shared 3.3V rail. Use Value: BP-capacitor filtering reduces output noise to 30µVRMS, enabling 16-bit ADC resolution without post-regulation LC filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, low-IQ LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8867EZK28+T | No auto-discharge; identical pinout, specs, and package - differs only in missing NMOS discharge switch. | Used where output discharge is handled externally or unnecessary; lower cost where auto-discharge not required. | Select MAX8867EZK28+T only if system-level discharge is already implemented or timing-critical discharge is absent. |
| Torex XC6206P282MR-G | 200mA output, 350mV dropout at 200mA, 40µVRMS noise, no BP pin or auto-discharge; SOT23-5 package. | Higher current but higher noise and dropout; lacks BP filtering and discharge - suitable for less noise-sensitive digital rails. | Choose XC6206P282MR-G only for cost-sensitive, non-critical 2.8V rails where 30µVRMS noise and sub-100µs discharge are not required. |
Compared with MAX8867EZK28+T, the MAX8868EZK28+T adds essential auto-discharge for safe hot-swap and reset integrity, while XC6206P282MR-G trades noise and discharge capability for higher current and lower unit cost - making MAX8868EZK28+T the sole choice when both ultra-low noise and deterministic output discharge are mandatory.
Availability
MAX8868EZK28+T is available at Aetrix Electronics and suitable for cellular telephones, PCMCIA cards, palmtop computers, and hand-held instruments requiring stable component supply, guaranteed long-term sourcing, and traceable manufacturing batches.
Supply support for MAX8868EZK28+T 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 precision analog, mixed-signal, and power-management ICs for demanding industrial, communications, and consumer applications.
The MAX8867/MAX8868 product line targets battery-powered portable electronics needing ultra-low noise, low IQ, and small footprint - specifically addressing noise-sensitive RF/analog subsystems in space-constrained handheld devices.
FAQ
What is the exact output voltage tolerance of the MAX8868EZK28+T?
The MAX8868EZK28+T has a factory-trimmed output voltage of 2.80V with ±1.4% initial accuracy over temperature and line/load conditions. This means the actual output at room temperature and nominal load falls between 2.76V and 2.84V, verified across -40°C to +85°C operating range per production test limits.
Does the MAX8868EZK28+T require an external BP capacitor to achieve its specified 30µVRMS noise?
Yes - the MAX8868EZK28+T achieves its rated 30µVRMS output noise only when a 0.01µF ceramic capacitor is placed between the BP pin and GND. Omitting this capacitor increases noise to ~70µVRMS; using >0.1µF degrades startup time without further noise reduction, per the device's internal 200kΩ BP resistor network.
How does the auto-discharge function of the MAX8868EZK28+T behave during shutdown?
When SHDN is pulled low, the MAX8868EZK28+T activates an internal NMOS transistor between OUT and GND, discharging the output capacitance to <100mV within 100µs for typical 1µF COUT. This behavior is exclusive to MAX8868 variants and is disabled in MAX8867 - confirmed in the functional diagram and shutdown timing plots of the datasheet.
Can the MAX8868EZK28+T operate safely with a 2.5V input supplying a 2.8V output?
No - the MAX8868EZK28+T cannot regulate at 2.8V with only 2.5V input. Its minimum input is 2.5V, but dropout voltage is 165mV at 150mA; thus, minimum valid input is 2.965V. At 2.5V input, the device enters dropout and output collapses - confirmed by absolute maximum ratings and dropout vs. load curves in the datasheet.
What thermal derating applies to the MAX8868EZK28+T in its thin SOT23-5 package?
The MAX8868EZK28+T in thin SOT23-5 has θJB = 110°C/W and a continuous power dissipation limit of 727mW at +70°C ambient. Above +70°C, dissipation must be reduced by 9.1mW per °C - meaning at +85°C ambient, max allowable power drops to 591mW, corresponding to ~211mA at 2.8V output with 3.5V input.
MAX8868EZK28+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- TSOT-23-5
MAX8868EZK28+T FAQ
1.How can I place an order for MAX8868EZK28+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8868EZK28+T 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 MAX8868EZK28+T reliable?
The price and inventory of MAX8868EZK28+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8868EZK28+T is usually 5 days.
3.What payment methods are accepted for MAX8868EZK28+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8868EZK28+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8868EZK28+T?
MAX8868EZK28+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8868EZK28+T 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 MAX8868EZK28+T?
For technical support, including MAX8868EZK28+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8868EZK28+T requirements.
6.How does Aetrix verify that MAX8868EZK28+T is sourced from the original manufacturer or authorized distributors?
All MAX8868EZK28+T 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 MAX8868EZK28+T meets industry standards.
7.What is the process for return or replacement of MAX8868EZK28+T?
All MAX8868EZK28+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8868EZK28+T, 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 MAX8868EZK28+T part is unused and in its original packaging.
Return procedure for MAX8868EZK28+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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