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Analog Devices Inc./Maxim Integrated MAX8878EZK29
- Part No.:
- MAX8878EZK29
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8878EZK29.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:2,646
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Product details
Overview
MAX8878EZK29 from Maxim Integrated is a low-noise, low-dropout linear regulator with 2.84V preset output, 150mA max output current, 165mV dropout at full load, 30µVRMS output noise, and 100µA operating supply current. It features auto-discharge on shutdown, reverse battery protection, and thermal/short-circuit protection - designed for space-constrained portable electronics requiring stable, clean power from single-cell Li-ion or alkaline sources.
For engineers reviewing the MAX8878EZK29 datasheet, MAX8878EZK29 pinout, MAX8878EZK29 application, or MAX8878EZK29 equivalent, key selection criteria include its thin SOT23-5 package, 2.84V output accuracy (±1.4%), auto-discharge functionality, BP-capacitor–dependent noise performance, and compatibility with industry-standard '2982 footprint.
Technical Context
The MAX8878EZK29 uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) to achieve low dropout and load-independent quiescent current. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to OUT, enabling precise regulation without external resistors.
It integrates logic-controlled shutdown (10nA ISHDN), thermal shutdown at +155°C with 15°C hysteresis, current limiting (160–390mA), and reverse-battery protection that limits reverse current to 1mA. The MAX8878 variant uniquely includes an active discharge path (300Ω) from OUT to GND during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.84V ±1.4% - factory-preset, eliminates external feedback resistors and layout sensitivity. |
| Max Output Current | 150mA - sufficient for baseband processors, RF front-ends, and sensor interfaces in handheld devices. |
| Dropout Voltage | 165mV at 150mA - enables operation down to ~2.99V input with 2.84V output, extending single-cell battery life. |
| Output Noise | 30µVRMS (10Hz–100kHz) - achieved with 0.01µF BP capacitor; critical for noise-sensitive ADCs and RF ICs. |
| Quiescent Current | 100µA (load-independent, even in dropout) - minimizes standby power loss in always-on subsystems. |
| Shutdown Current | 0.01µA at +25°C - ultra-low leakage during sleep mode; supports long-term battery retention. |
| Auto-Discharge Resistance | 300Ω - actively pulls OUT to GND within microseconds of SHDN assertion, preventing floating bias in downstream circuitry. |
Pinout & Package
MAX8878EZK29 is housed in a 5-pin thin SOT23 package (JEDEC MO-178AA), optimized for PCB area and thermal performance in portable designs. The GND pin serves dual roles: electrical ground reference and primary thermal path to the PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input supply connection | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass to GND for stability and line-transient immunity. |
| 2 - GND | Ground reference and thermal sink | Must be soldered to large copper area or ground plane to maintain TJ ≤ +150°C under full load. |
| 3 - SHDN | Active-low enable/disable control | Pulled low disables regulator and triggers auto-discharge; pulled high (≥2.0V) enables normal operation. |
| 4 - BP | Bypass node for reference noise filtering | Connects to 0.01µF ceramic capacitor; forms 80Hz low-pass filter to reduce reference noise contribution to output. |
| 5 - OUT | Regulated output terminal | Delivers up to 150mA; requires 3.3µF ceramic capacitor (ESR < 0.2Ω) for VOUT < 2.5V - but 2.84V uses 1µF per spec. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge on shutdown | 300Ω internal discharge path actively pulls OUT to GND, eliminating need for external bleed resistors in systems requiring fast power-down sequencing. |
| Reverse battery protection | Limits reverse current to ≤1mA when IN or SHDN falls below GND, preventing damage during incorrect battery insertion or hot-swap events. |
| P-channel MOSFET pass element | 1.1Ω typical RDS(ON) enables low dropout and eliminates base-drive current - reducing IQ by >50% vs. PNP-based regulators under heavy load. |
| Thermal shutdown with hysteresis | Triggers at +155°C and re-enables only after cooling by 15°C, preventing thermal oscillation during sustained overload conditions. |
| Low-noise BP filtering architecture | Internal 200kΩ resistor + external 0.01µF BP capacitor creates dedicated noise-reduction path, isolating reference noise from output without degrading transient response. |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
|
Use Scenario: Powering baseband processor core voltage (2.8V rail) in GSM/EDGE handsets with single Li-ion cell (2.8–4.2V). IC Role / Device Role / Timing Role: Primary LDO delivering clean, regulated 2.84V supply with fast load-transient response to handle burst-mode TX current spikes. Use Value: 12mV typical load-step deviation (0→50mA) and 30µVRMS noise ensure minimal clock jitter and ADC SNR degradation in RF sections. |
Use Scenario: Providing isolated 2.84V supply to PCMCIA card controller and interface logic during hot-insertion into laptops. IC Role / Device Role / Timing Role: Regulator with reverse-battery protection and auto-discharge, ensuring safe power-up/down sequencing and preventing backfeed into host bus. Use Value: 10nA shutdown current and 300Ω discharge path eliminate residual voltage on card VCC during ejection, meeting PCMCIA 2.1 hot-swap compliance. |
| Hand-Held Instruments | Electronic Planners |
|
Use Scenario: Supplying precision analog front-end (AFE) and microcontroller in portable multimeters or data loggers powered by two alkaline cells (1.8–3.2V). IC Role / Device Role / Timing Role: Low-noise, low-dropout regulator maintaining stable 2.84V despite battery voltage sag under load and temperature drift. Use Value: ±1.4% output accuracy over -40°C to +85°C and <0.04%/mA load regulation preserve measurement linearity and calibration integrity. |
Use Scenario: Powering real-time clock (RTC), SRAM backup, and touch-screen controller in palm-sized organizers with coin-cell or rechargeable backup. IC Role / Device Role / Timing Role: Always-on LDO with ultra-low 100µA IQ and 0.01µA shutdown current, enabling multi-month battery life in sleep mode. Use Value: Auto-discharge prevents RTC register corruption during power cycling, while 165mV dropout allows operation until battery reaches ~2.99V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8877EZK29 | No auto-discharge function; identical pinout, specs, and package - differs only in absence of active OUT discharge path. | Suitable where downstream circuitry does not require rapid VOUT collapse during shutdown (e.g., non-sequenced systems). | Select MAX8877EZK29 if auto-discharge is unnecessary and cost minimization is prioritized. |
| Torex XC6206P282MR-G | 2.8V output (±2%), 100mA max, 250mV dropout at 100mA, 40µVRMS noise, SOT23-5 package - no BP pin or auto-discharge. | Lower current and higher dropout limit use to lighter loads and higher-input systems; lacks noise optimization features. | Choose XC6206P282MR-G only for cost-sensitive, low-current applications where 30µVRMS noise and 150mA delivery are not required. |
Compared with MAX8878EZK29, MAX8877EZK29 removes auto-discharge but retains identical regulation performance and footprint - ideal for simplified designs. XC6206P282MR-G offers lower cost but sacrifices 50mA current headroom, 115mV dropout margin, and 10µVRMS noise advantage, making it unsuitable for noise-critical or high-load portable systems.
Availability
MAX8878EZK29 is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, hand-held instruments, and electronic planners requiring stable component supply, long-lifecycle support, and guaranteed traceability for medical and industrial deployments.
Supply support for MAX8878EZK29 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 MAX8877/MAX8878 product line was engineered specifically for battery-powered portable electronics demanding ultra-low noise, minimal quiescent current, and robust protection - targeting design-in across handsets, modems, and handheld instrumentation.
FAQ
What is the exact output voltage tolerance of the MAX8878EZK29 over temperature and load?
The MAX8878EZK29 delivers 2.84V with ±1.4% initial accuracy at +25°C and ±3% total variation over -40°C to +85°C and 0.1mA–120mA load range (per Electrical Characteristics table). This includes line, load, and temperature effects - verified across production lots using SQC methods, not just typical curves.
Does the MAX8878EZK29 require an external BP capacitor, and what happens if it's omitted?
Yes - the MAX8878EZK29 requires a 0.01µF ceramic capacitor between BP and GND to achieve its specified 30µVRMS output noise. Omitting it increases output noise to ~200µVRMS (typical), degrading performance in ADC, RF, or audio circuits. The BP pin must never be left floating or shorted.
How does the auto-discharge function of the MAX8878EZK29 operate, and what is its resistance value?
The MAX8878EZK29 activates a 300Ω internal switch between OUT and GND when SHDN is pulled low. This discharges the output capacitance rapidly - e.g., a 1µF output cap drops from 2.84V to <100mV in <300µs. The feature is exclusive to MAX8878 variants and absent in MAX8877EZK29.
Can the MAX8878EZK29 be used with input voltages below 2.5V?
No - the absolute minimum input voltage for the MAX8878EZK29 is 2.5V, as specified in Absolute Maximum Ratings and Electrical Characteristics. Operation below 2.5V may cause regulation failure, increased dropout, or undefined behavior; it is not characterized or guaranteed.
What thermal derating applies to the MAX8878EZK29 in its thin SOT23-5 package?
In the thin SOT23-5 package, the MAX8878EZK29 has θJB = 110°C/W and a continuous power dissipation limit of 727mW at +70°C ambient, derating by 9.1mW/°C above that. To sustain 150mA at 2.5V dropout (375mW dissipation), board-level thermal design must keep junction temperature ≤ +150°C.
MAX8878EZK29 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):
- 2.84V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.165V @ 150mA (Typ)
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- -
- 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
MAX8878EZK29 FAQ
1.How can I place an order for MAX8878EZK29 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8878EZK29 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 MAX8878EZK29 reliable?
The price and inventory of MAX8878EZK29 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8878EZK29 is usually 5 days.
3.What payment methods are accepted for MAX8878EZK29?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8878EZK29 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8878EZK29?
MAX8878EZK29 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8878EZK29 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 MAX8878EZK29?
For technical support, including MAX8878EZK29 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8878EZK29 requirements.
6.How does Aetrix verify that MAX8878EZK29 is sourced from the original manufacturer or authorized distributors?
All MAX8878EZK29 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 MAX8878EZK29 meets industry standards.
7.What is the process for return or replacement of MAX8878EZK29?
All MAX8878EZK29 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8878EZK29, 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 MAX8878EZK29 part is unused and in its original packaging.
Return procedure for MAX8878EZK29:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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