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Analog Devices Inc./Maxim Integrated MAX8867EZK29-T
- Part No.:
- MAX8867EZK29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8867EZK29-T.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX8867EZK29-T from Maxim Integrated is a low-noise, low-dropout linear regulator with 2.84V preset output, 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 reverse battery protection - designed for space-constrained, battery-powered portable electronics requiring stable low-noise voltage rails.
For engineers reviewing the MAX8867EZK29-T datasheet, MAX8867EZK29-T pinout, MAX8867EZK29-T application, or MAX8867EZK29-T equivalent, key selection criteria include output voltage accuracy (±1.4%), thermal shutdown behavior (155°C trip), BP-capacitor–dependent noise reduction, and thin SOT23-5 package compatibility with high-density PCB layouts.
Technical Context
The MAX8867EZK29-T implements a bandgap-referenced error amplifier driving a 1.1Ω typical P-channel MOSFET pass element, enabling ultra-low quiescent current (100µA) independent of load or dropout condition. Its BP pin connects to an internal 200kΩ resistor forming an 80Hz low-pass filter with an external 0.01µF capacitor, directly reducing output voltage noise.
Unlike NPN-based LDOs, it avoids base-drive current penalties in dropout and maintains stable regulation down to 2.5V input. The device integrates reverse-battery protection limiting reverse current to 1mA, thermal shutdown with 20°C hysteresis, and short-circuit protection with indefinite fault tolerance - all within a 5-pin thin SOT23 footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.84V ±1.4% - factory-preset, no external feedback required; enables single-component power rail for 2.8V logic or RF biasing. |
| Max Output Current | 150mA - sufficient for powering baseband processors, RF front-ends, or sensor signal chains in handheld devices. |
| Dropout Voltage | 165mV at 150mA - allows operation down to VIN = 3.005V, extending usable battery life in Li-ion or dual-cell alkaline systems. |
| Output Noise | 30µVRMS (10Hz–100kHz) - achieved with 0.01µF BP capacitor; critical for noise-sensitive analog/RF stages. |
| Quiescent Current | 100µA (operating), 10nA (shutdown) - minimizes standby drain in always-on subsystems like real-time clocks or wake-up controllers. |
| Input Voltage Range | 2.5V to 6.5V - supports single Li-ion (2.7–4.2V), two alkaline (3.0–3.6V), or regulated 5V supply rails. |
| Thermal Shutdown | 155°C trip, 135°C recovery - protects against sustained overload in sealed enclosures without external thermal management. |
Pinout & Package
MAX8867EZK29-T is housed in a thin 5-pin SOT23 package (JEDEC MO-178AA), optimized for high-density portable PCBs. The GND pin serves as both electrical reference and thermal path - requires direct connection to a large copper pour or ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low enable control | Logic-low (≤0.4V) places regulator in 10nA shutdown; on MAX8867 (not MAX8868), no auto-discharge occurs. |
| 2 - GND | Power ground & thermal sink | Primary return path; must be soldered to ≥100mm² copper area to maintain θJB ≤110°C/W and prevent thermal derating. |
| 3 - IN | Input voltage supply | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass to GND near pin for stability and line-transient suppression. |
| 4 - OUT | Regulated output | Delivers 2.84V up to 150mA; requires ≥1µF low-ESR (≤0.2Ω) ceramic capacitor to GND for load-transient response. |
| 5 - BP | Noise-reduction bypass | Connects to internal 200kΩ resistor; 0.01µF ceramic capacitor here reduces output noise to 30µVRMS. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 30µVRMS output noise with 0.01µF BP cap - enables clean power for ADC references or VCO biasing without additional filtering. |
| P-channel pass transistor | 1.1Ω RDS(ON), zero base-drive current - eliminates quiescent current increase in dropout, unlike PNP-based LDOs. |
| Reverse battery protection | Limits reverse current to ≤1mA when VIN or SHDN < 0V - prevents damage during battery insertion errors in consumer handhelds. |
| Stable under wide COUT ESR | Operates stably with 1µF–10µF output capacitors and ESR up to 1Ω at 150mA - accommodates cost-effective X5R/X7R ceramics or tantalums. |
| Fast shutdown exit | 300µs delay to 95% VOUT after SHDN high - supports rapid wake-up in low-power microcontroller sleep modes. |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
Use Scenario: Powering baseband processor I/O banks and RF transceiver bias rails in GSM/EDGE handsets with single Li-ion battery. IC Role / Device Role / Timing Role: Primary 2.84V LDO delivering clean, low-noise voltage to sensitive analog sections while maintaining regulation down to end-of-life battery voltage. Use Value: 165mV dropout extends talk time by ~12 minutes vs. higher-dropout regulators; 30µVRMS noise prevents spurious emissions in receive band. | Use Scenario: Providing isolated 2.84V supply to PCMCIA card controller and interface logic in laptop expansion slots. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling host 3.3V rail, rejecting noise from shared bus switching transients. Use Value: 63dB PSRR at 1kHz suppresses digital switching noise; thin SOT23 fits tight card-edge height constraints (<1.1mm). |
| Hand-Held Instruments | Electronic Planners |
Use Scenario: Supplying precision analog front-end (AFE) and microcontroller core in portable multimeters or data loggers. IC Role / Device Role / Timing Role: Low-drift, low-noise 2.84V source for ADC reference and op-amp biasing, minimizing measurement offset and noise floor. Use Value: ±1.4% output accuracy and <0.04%/mA load regulation ensure consistent 16-bit ADC full-scale calibration across battery discharge. | Use Scenario: Powering real-time clock (RTC), SRAM backup, and touch-screen controller in palm-sized PDAs. IC Role / Device Role / Timing Role: Always-on LDO with 10nA shutdown current preserving battery charge during extended sleep periods. Use Value: 10nA shutdown current enables >1-year RTC backup on CR2032; 100µA operating IQ minimizes active-mode battery drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8867EUK29-T | Same die, regular (not thin) SOT23-5 package; 140°C/W θJB vs. 110°C/W for thin variant. | Suitable where board height >1.3mm is acceptable; slightly lower thermal performance in confined spaces. | Select when standard SOT23 footprint is already used and thermal margin exceeds 15°C. |
| TPS78228DRVT | 2.8V output (vs. 2.84V), 150mA, 1.8µA IQ, but 170mV dropout at 150mA and 50µVRMS noise. | Better quiescent current for ultra-low-power sleep, but higher noise limits use in RF/analog sections. | Prefer for battery-backed RTC-only loads; avoid where 30µVRMS noise or exact 2.84V is required. |
Compared with MAX8867EZK29-T, the MAX8867EUK29-T offers identical electrical specs in a taller package with reduced thermal efficiency, while the TPS78228DRVT trades noise performance and output voltage precision for lower quiescent current - making MAX8867EZK29-T optimal for noise-critical 2.84V rails in height-constrained designs.
Availability
MAX8867EZK29-T is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, hand-held instruments, and electronic planners requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX8867EZK29-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) 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 MAX8867/MAX8868 product line was engineered specifically for battery-powered portable electronics demanding ultra-low noise, minimal dropout, and robust protection - targeting design-in where size, efficiency, and signal integrity are co-constrained.
FAQ
What is the exact output voltage of the MAX8867EZK29-T and how is it set?
The MAX8867EZK29-T has a factory-trimmed output voltage of 2.84V ±1.4%, set internally via laser trimming of the feedback divider. No external resistors are required - the voltage is fixed and cannot be adjusted. This precision enables direct replacement of discrete resistor-divider LDOs while eliminating layout sensitivity and temperature drift associated with external networks. The "29" suffix in MAX8867EZK29-T explicitly denotes the 2.84V variant per Maxim's expanded ordering table.
Does the MAX8867EZK29-T include auto-discharge functionality during shutdown?
No, the MAX8867EZK29-T does not provide auto-discharge. That feature is exclusive to the MAX8868 family (e.g., MAX8868EZK29-T). When the MAX8867EZK29-T is placed in shutdown (SHDN ≤0.4V), its output floats and retains residual charge on the output capacitor. For applications requiring active discharge, the MAX8868EZK29-T or an external discharge circuit must be used. The MAX8867EZK29-T datasheet explicitly states auto-discharge is "MAX8868 only" in the functional diagram and pin description.
What capacitor values are required for stable operation of the MAX8867EZK29-T?
The MAX8867EZK29-T requires a minimum 1µF ceramic capacitor (X5R/X7R, ESR ≤0.2Ω) on the OUT pin and a 1µF ceramic capacitor on the IN pin. A 0.01µF ceramic capacitor must be placed on the BP pin to achieve the specified 30µVRMS noise. For improved transient response and stability across temperature, 2.2µF–10µF output capacitance is recommended - especially with Z5U/Y5V dielectrics below –10°C or high-ESR tantalum capacitors.
How does the MAX8867EZK29-T handle reverse battery connection?
The MAX8867EZK29-T incorporates integrated reverse battery protection that limits reverse current to ≤1mA when either the IN or SHDN pin falls below ground potential. This is achieved by disconnecting internal circuitry and blocking parasitic conduction paths - preventing latch-up or permanent damage during incorrect battery installation. Unlike external diode solutions, this feature adds no forward voltage drop or power loss during normal operation, preserving efficiency in battery-critical applications.
What is the thermal performance difference between the MAX8867EZK29-T and MAX8867EUK29-T packages?
Both variants share identical silicon and electrical specs, but the MAX8867EZK29-T uses a thin SOT23-5 package with θJB = 110°C/W, while the MAX8867EUK29-T uses a regular SOT23-5 with θJB = 140°C/W. At 150mA and 165mV dropout (25mW dissipation), the thin package runs ~7.5°C cooler under identical board conditions. This makes the MAX8867EZK29-T preferable for thermally constrained designs such as slim smartphones or stacked modules where height <1.1mm and junction temperature margin are critical.
MAX8867EZK29-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 2.9V
- 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
MAX8867EZK29-T FAQ
1.How can I place an order for MAX8867EZK29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8867EZK29-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 MAX8867EZK29-T reliable?
The price and inventory of MAX8867EZK29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8867EZK29-T is usually 5 days.
3.What payment methods are accepted for MAX8867EZK29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8867EZK29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8867EZK29-T?
MAX8867EZK29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8867EZK29-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 MAX8867EZK29-T?
For technical support, including MAX8867EZK29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8867EZK29-T requirements.
6.How does Aetrix verify that MAX8867EZK29-T is sourced from the original manufacturer or authorized distributors?
All MAX8867EZK29-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 MAX8867EZK29-T meets industry standards.
7.What is the process for return or replacement of MAX8867EZK29-T?
All MAX8867EZK29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8867EZK29-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 MAX8867EZK29-T part is unused and in its original packaging.
Return procedure for MAX8867EZK29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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