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Analog Devices Inc./Maxim Integrated MAX8878EZK18+T
- Part No.:
- MAX8878EZK18+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8878EZK18+T.pdf
- Description:
- IC REG LIN 1.8V 150MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,162
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Product details
Overview
MAX8878EZK18+T from Maxim Integrated is a low-noise, low-dropout linear regulator with 1.8V preset output, 150mA maximum output current, 165mV dropout at full load, 30µVRMS output noise, and integrated auto-discharge function for rapid output discharge during shutdown. It serves as a primary power supply for battery-powered portable electronics requiring stable, low-noise voltage regulation.
For engineers reviewing the MAX8878EZK18+T datasheet, MAX8878EZK18+T pinout, MAX8878EZK18+T application, or MAX8878EZK18+T equivalent, key selection criteria include dropout performance at 150mA, shutdown leakage (10nA), thermal protection behavior, BP capacitor noise filtering requirements, and SOT23-5 thin-package thermal resistance (θJB = 110°C/W).
Technical Context
The MAX8878EZK18+T uses an internal P-channel MOSFET pass transistor (RDS(ON) ≈ 1.1Ω) to achieve low dropout and maintain 100µA operating supply current independent of load or input voltage. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin.
It integrates reverse-battery protection limiting reverse current to 1mA, thermal shutdown at +155°C with 15°C hysteresis, and a dedicated BP pin with internal 200kΩ resistor forming an 80Hz low-pass filter when paired with a 0.01µF ceramic capacitor - enabling 30µVRMS noise performance over 10Hz–100kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.80V ±1.4% (factory-preset; fixed, non-adjustable) |
| Max Output Current | 150mA continuous; current limit activates at ≥160mA (min) |
| Dropout Voltage | 165mV at 150mA load (VIN ≥ VOUT + 0.165V ensures regulation) |
| Output Noise | 30µVRMS (10Hz–100kHz, CBP = 0.01µF, COUT = 10µF) |
| Quiescent Current | 100µA (operating, load-independent); 10nA in logic-controlled shutdown |
| Input Voltage Range | 2.5V to 6.5V (absolute max: -7V to +7V on IN relative to GND) |
| Shutdown Discharge | Active auto-discharge via 300Ω internal path (MAX8878-specific feature) |
Pinout & Package
MAX8878EZK18+T is housed in a 5-pin Thin SOT23 package (JEDEC MO-178AA), optimized for low thermal resistance (θJB = 110°C/W) and space-constrained PCB layouts. 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 | Regulator input supply | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass to GND for stability and line-transient immunity |
| 2 - GND | Ground reference & thermal sink | Must be soldered to large copper area or ground plane to manage power dissipation up to 727mW |
| 3 - SHDN | Active-low enable/shutdown control | Logic low (≤0.4V) enables 10nA shutdown mode and triggers auto-discharge on MAX8878 |
| 4 - BP | Bypass capacitor connection | Connects to internal 200kΩ resistor; 0.01µF ceramic cap reduces reference noise and achieves 30µVRMS output noise |
| 5 - OUT | Regulated output | Delivers up to 150mA; requires ≥3.3µF ceramic cap (ESR < 0.2Ω) for VOUT = 1.8V stability per datasheet guidance |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | 300Ω internal discharge path actively pulls OUT to GND during SHDN assertion - eliminates hold-up time in power sequencing |
| P-channel MOSFET pass element | Eliminates base-drive current loss; enables constant 100µA IQ across all load conditions including dropout |
| Reverse battery protection | Blocks reverse current to ≤1mA when VIN or SHDN falls below GND - prevents damage in miswired battery compartments |
| Thermal shutdown with hysteresis | Shuts down at +155°C junction temperature and re-enables only after cooling by 15°C - prevents thermal oscillation under overload |
| Low-noise BP filtering architecture | Internal 200kΩ + external 0.01µF forms 80Hz LPF on reference node - isolates bandgap noise before error amplifier |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
|
Use Scenario: Powering RF transceiver bias circuits and baseband processor I/O rails in GSM/CDMA handsets with single-cell Li-ion supply. IC Role / Device Role / Timing Role: Primary LDO delivering clean 1.8V to noise-sensitive analog front-end blocks while maintaining regulation down to 2.0V battery voltage. Use Value: 30µVRMS noise prevents AM-to-PM conversion in RF stages; 165mV dropout extends usable battery life by ~12 minutes per charge cycle. |
Use Scenario: Providing regulated 1.8V supply to PCMCIA card controllers and interface logic during hot-insertion and low-power suspend states. IC Role / Device Role / Timing Role: Standby-power LDO with 10nA shutdown current and fast (<300µs) wake-up - meets PCMCIA Type II power management timing requirements. Use Value: Auto-discharge ensures VOUT drops below 0.2V within 1ms of SHDN assertion - satisfies PCMCIA bus isolation timing for safe card removal. |
| Palmtop Computers | Electronic Planners |
|
Use Scenario: Supplying core logic voltage to ARM7-based application processors and SRAM in compact palmtop devices powered by two AA alkaline cells. IC Role / Device Role / Timing Role: Main system LDO with thermal protection and reverse-battery immunity - critical for field reliability in consumer handhelds. Use Value: Reverse battery protection prevents catastrophic failure if user inserts batteries backward; 110°C/W θJB enables operation at 70°C ambient without derating. |
Use Scenario: Regulating 1.8V for real-time clock (RTC), memory backup, and LCD controller in battery-backed electronic organizers. IC Role / Device Role / Timing Role: Ultra-low-IQ LDO supporting >1-year coin-cell backup runtime while maintaining precise 1.8V output accuracy (±1.4%). Use Value: 100µA operating IQ and 10nA shutdown current minimize drain on CR2032 cell; ±1.4% initial accuracy ensures RTC timing drift < 2ppm. |
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 |
|---|---|---|---|
| MAX8877EZK18+T | No auto-discharge; identical pinout, specs, and package - differs only in absence of BP-driven discharge path | Suitable where output hold-up is acceptable or externally managed; lower BOM cost where discharge not required | Select MAX8877EZK18+T only if auto-discharge is unnecessary - otherwise MAX8878EZK18+T provides guaranteed safe discharge behavior. |
| Torex XC6206P182MR-G | 150mA, 1.8V, SOT23-5; 250mV dropout at 150mA; 40µVRMS noise; no BP pin or auto-discharge | Lacks BP noise filtering and active discharge - higher noise and slower shutdown decay; requires larger output cap for stability | Use XC6206P182MR-G only in cost-sensitive, non-noise-critical applications where 250mV dropout and 40µVRMS noise are acceptable. |
Compared with MAX8877EZK18+T and XC6206P182MR-G, the MAX8878EZK18+T uniquely delivers guaranteed sub-millisecond output discharge, lowest noise (30µVRMS), and tightest dropout (165mV), making it optimal for RF, portable, and battery-life-critical designs where both precision and safety sequencing matter.
Availability
MAX8878EZK18+T is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, and palmtop computers requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for MAX8878EZK18+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 MAX8877/MAX8878 product line was designed specifically for battery-powered portable electronics demanding ultra-low noise, minimal dropout, and robust protection features - targeting cellular phones, handheld instruments, and memory-card interfaces.
FAQ
What is the exact output voltage tolerance of the MAX8878EZK18+T?
The MAX8878EZK18+T has a factory-trimmed output voltage of 1.80V with initial accuracy of ±1.4% at TA = +25°C and IO = 0.1mA. Over temperature (-40°C to +85°C) and load (0.1mA to 120mA), the total output voltage variation remains within ±3.5% for VOUT < 2.5V, as specified in the Electrical Characteristics table. This tolerance ensures reliable operation of 1.8V I/O domains in portable processors and memory interfaces.
Does the MAX8878EZK18+T require an external BP capacitor, and what happens if it's omitted?
Yes, the MAX8878EZK18+T requires a 0.01µF ceramic capacitor between BP and GND to achieve its specified 30µVRMS output noise. Without this capacitor, output noise increases significantly - exceeding 100µVRMS - due to unfiltered bandgap reference noise coupling into the error amplifier. Omission also degrades PSRR above 1kHz and may cause instability under transient loads, as confirmed in the Typical Operating Characteristics graphs.
How does the auto-discharge function of the MAX8878EZK18+T operate during shutdown?
When SHDN is pulled low, the MAX8878EZK18+T activates an internal 300Ω discharge path between OUT and GND, actively pulling the output voltage to ground. This occurs regardless of load condition and completes within 1ms for typical COUT ≤ 10µF. The feature is exclusive to the MAX8878 variant and is absent in the pin-compatible MAX8877EZK18+T - enabling safe power-down sequencing in hot-plug and battery-backup systems.
What thermal performance can be expected from the MAX8878EZK18+T in its Thin SOT23 package?
The MAX8878EZK18+T in Thin SOT23 has a junction-to-board thermal resistance (θJB) of 110°C/W. With a 727mW maximum continuous power dissipation rating at TA = +70°C, it supports up to 150mA at 2.5V input (1.8V output) with ≤1.2°C junction rise above board temperature - assuming proper GND pad layout. Derating begins above +70°C at 9.1mW/°C, making it suitable for sealed handheld enclosures up to +75°C ambient.
Is the MAX8878EZK18+T pin-compatible with the industry-standard '2982 regulator?
Yes, the MAX8878EZK18+T is explicitly designed as a pin-compatible upgrade to the industry-standard µPD722982 ('2982) regulator. It shares identical SOT23-5 pinout (IN, GND, SHDN, BP, OUT), same footprint, and compatible voltage/current ratings - allowing drop-in replacement without PCB modification. Key improvements include lower dropout (165mV vs. typical 300mV), lower noise (30µVRMS vs. >60µVRMS), and added auto-discharge functionality.
MAX8878EZK18+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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.165V @ 150mA (Typ)
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- -
- 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
MAX8878EZK18+T FAQ
1.How can I place an order for MAX8878EZK18+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8878EZK18+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 MAX8878EZK18+T reliable?
The price and inventory of MAX8878EZK18+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8878EZK18+T is usually 5 days.
3.What payment methods are accepted for MAX8878EZK18+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8878EZK18+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8878EZK18+T?
MAX8878EZK18+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8878EZK18+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 MAX8878EZK18+T?
For technical support, including MAX8878EZK18+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8878EZK18+T requirements.
6.How does Aetrix verify that MAX8878EZK18+T is sourced from the original manufacturer or authorized distributors?
All MAX8878EZK18+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 MAX8878EZK18+T meets industry standards.
7.What is the process for return or replacement of MAX8878EZK18+T?
All MAX8878EZK18+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8878EZK18+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 MAX8878EZK18+T part is unused and in its original packaging.
Return procedure for MAX8878EZK18+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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