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Analog Devices Inc./Maxim Integrated MAX8878EUK29+T
- Part No.:
- MAX8878EUK29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8878EUK29+T.pdf
- Description:
- IC REG LINEAR 2.9V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,088
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Product details
Overview
MAX8878EUK29+T 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 SOT23-5 regular package - designed for battery-powered handheld instruments requiring stable low-voltage bias under variable load and temperature.
For engineers reviewing the MAX8878EUK29+T datasheet, MAX8878EUK29+T pinout, MAX8878EUK29+T application, or MAX8878EUK29+T equivalent, key selection criteria include guaranteed ±1.4% output accuracy over -40°C to +85°C, 10nA shutdown current, auto-discharge functionality, and compatibility with industry-standard '2982 footprint.
Technical Context
The MAX8878EUK29+T uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling low quiescent current (100µA across all 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.
It integrates reverse-battery protection limiting reverse supply 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 - directly reducing output voltage noise to 30µVRMS (10Hz–100kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.84V ±1.4% (factory-preset; stable across -40°C to +85°C and 0.1–120mA load) |
| Max Output Current | 150mA continuous; current limit 160–390mA (prevents damage during short-circuit) |
| Dropout Voltage | 165mV at 150mA (enables operation down to VIN = 3.005V; critical for end-of-life Li-ion battery use) |
| Output Noise | 30µVRMS (10Hz–100kHz, with 0.01µF BP cap and 10µF COUT; supports noise-sensitive analog/RF circuitry) |
| Quiescent Current | 100µA (constant across load, input voltage, and dropout - extends battery life in always-on systems) |
| Shutdown Current | 10nA (logic-controlled SHDN pin; enables ultra-low-power sleep modes in portable devices) |
| Auto-Discharge | Active discharge path (300Ω typical) on SHDN assertion - rapidly clears output capacitance for safe system reset |
Pinout & Package
MAX8878EUK29+T is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with GND serving as both electrical return and thermal path to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply connection | Accepts 2.5V–6.5V; requires ≥1µF bypass to GND for stability and line-transient suppression |
| 2 GND | Ground reference and thermal sink | Must connect to large copper area or ground plane to maintain TJ ≤ +150°C at full load |
| 3 SHDN | Active-low enable/disable control | Pulled low disables regulator and activates auto-discharge; pulled high (≥2.0V) enables normal operation |
| 4 BP | Bypass node for reference noise filtering | Connects internally to 200kΩ resistor; 0.01µF ceramic cap reduces output noise by >50% vs. no BP cap |
| 5 OUT | Regulated output terminal | Delivers up to 150mA; requires 1µF (≥2.5V) or 3.3µF (<2.5V) ceramic cap with <0.2Ω ESR for stability |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current loss; maintains 100µA IQ even in dropout - 15× lower than comparable PNP LDOs |
| Auto-discharge function | 300Ω internal discharge path actively pulls OUT to GND within microseconds of SHDN assertion - prevents floating bias in multi-rail systems |
| Reverse battery protection | Blocks reverse current to ≤1mA when IN or SHDN falls below GND - protects IC and upstream power source without external diodes |
| Low-noise BP pin architecture | Internal 200kΩ + external 0.01µF forms 80Hz filter; reduces broadband noise contribution from bandgap reference |
| Thermal shutdown with hysteresis | Shuts down at +155°C and re-enables only after cooling to +140°C - prevents thermal oscillation during sustained overload |
Applications
| Hand-Held Instruments | Palmtop Computers |
|---|---|
|
Use Scenario: Portable multimeters and data loggers powered by single-cell Li-ion batteries with dynamic load profiles. IC Role / Device Role / Timing Role: Primary 2.84V bias rail for precision ADCs, op-amps, and microcontroller I/O domains. Use Value: 30µVRMS noise ensures <1 LSB error in 16-bit ADC conversions; 165mV dropout extends usable battery range by ~120 minutes. |
Use Scenario: Compact palmtop PCs requiring clean, sequenced power for CPU core, memory, and display backlight drivers. IC Role / Device Role / Timing Role: Secondary low-noise supply for analog sensor interfaces and real-time clock circuits. Use Value: Auto-discharge clears residual charge before power sequencing restarts; ±1.4% accuracy maintains timing margin for RTC crystal oscillator bias. |
| Electronic Planners | PCMCIA Cards |
|
Use Scenario: Battery-backed PDAs with flash memory, touch controllers, and RF transceivers operating in intermittent active/sleep cycles. IC Role / Device Role / Timing Role: Always-on 2.84V rail powering SRAM retention, wake-up logic, and low-power MCU peripherals. Use Value: 10nA shutdown current limits annual battery drain to <1% capacity; reverse-battery protection guards against accidental polarity reversal during hot-swap. |
Use Scenario: Hot-pluggable PCMCIA modems and network cards drawing burst currents up to 120mA from host 3.3V rails. IC Role / Device Role / Timing Role: Local LDO generating isolated 2.84V for PHY layer and serial interface logic. Use Value: 1.1Ω RDS(ON) minimizes load-transient droop (≤12mV step response); '2982 pinout allows drop-in replacement in legacy designs. |
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 |
|---|---|---|---|
| MAX8877EUK29+T | No auto-discharge; identical pinout, output voltage, noise, and dropout specs | Suitable where rapid output discharge is unnecessary and lowest BOM cost is prioritized | Select MAX8877EUK29+T only if auto-discharge is not required - same footprint but lacks active discharge path |
| Torex XC6206P282MR-G | 2.8V output (±2%), 100mA max, 250mV dropout at 100mA, no BP pin or auto-discharge | Lower current capability and higher dropout limit use to non-battery or low-dynamic-load applications | Choose XC6206P282MR-G only for space-constrained designs needing SOT23-3; verify 250mV dropout meets system VIN margin |
Compared with MAX8878EUK29+T, MAX8877EUK29+T omits auto-discharge but matches all electrical specs and pinout, while XC6206P282MR-G trades current capability, dropout, and noise performance for smaller package size and lower cost - making it suitable only for less demanding applications.
Availability
MAX8878EUK29+T is available at Aetrix Electronics and suitable for hand-held instruments, palmtop computers, electronic planners, and PCMCIA cards requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across industrial temperature range.
Supply support for MAX8878EUK29+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 engineered specifically for battery-powered portable electronics requiring ultra-low quiescent current, low noise, and robust protection - targeting cellular telephones, cordless phones, and handheld instrumentation.
FAQ
What is the exact output voltage tolerance of MAX8878EUK29+T over temperature and load?
The MAX8878EUK29+T guarantees ±1.4% output voltage accuracy across -40°C to +85°C ambient temperature and 0.1mA to 120mA load current, as specified in the Electrical Characteristics table. This tolerance applies to the factory-preset 2.84V output and is measured with VIN ≥ VOUT + 0.5V or 2.5V (whichever is greater). The MAX8878EUK29+T does not require external resistors to set this voltage.
Does MAX8878EUK29+T support auto-discharge, and how fast does it discharge the output?
Yes, MAX8878EUK29+T includes an integrated auto-discharge function activated when the SHDN pin is driven low. It provides a 300Ω typical resistance path from OUT to GND, discharging a 10µF output capacitor from 2.84V to <100mV in under 3ms. This behavior is exclusive to the MAX8878 variant - the MAX8877EUK29+T does not offer this feature.
What capacitor values are required for stable operation of MAX8878EUK29+T?
For stable operation, MAX8878EUK29+T requires a minimum 1µF ceramic input capacitor (CIN) and a 1µF ceramic output capacitor (COUT) with <0.2Ω ESR when VOUT ≥ 2.5V. Since MAX8878EUK29+T outputs 2.84V, a 1µF COUT suffices. A 0.01µF ceramic capacitor must be placed on the BP pin to achieve the specified 30µVRMS noise performance.
How does the dropout voltage of MAX8878EUK29+T behave under varying load and temperature?
The dropout voltage of MAX8878EUK29+T is load- and temperature-dependent: 165mV typical at 150mA and +25°C, rising to ~180mV at +85°C and remaining ~155mV at -40°C. At 50mA, dropout drops to 55mV. This behavior stems from the P-channel MOSFET's RDS(ON) variation and is fully characterized in the Datasheet Figure 10 and 11 curves.
Is MAX8878EUK29+T pin-compatible with the industry-standard '2982 regulator?
Yes, MAX8878EUK29+T is explicitly designed as a pin-compatible upgrade to the industry-standard '2982 family. It shares identical SOT23-5 pinout (IN, GND, SHDN, BP, OUT), mechanical footprint, and mounting dimensions. No PCB layout changes are needed when replacing legacy '2982 devices with MAX8878EUK29+T - provided the BP capacitor is added per design guidelines.
MAX8878EUK29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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):
- 2.9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.165V @ 150mA (Typ)
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- -
- 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
MAX8878EUK29+T FAQ
1.How can I place an order for MAX8878EUK29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8878EUK29+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 MAX8878EUK29+T reliable?
The price and inventory of MAX8878EUK29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8878EUK29+T is usually 5 days.
3.What payment methods are accepted for MAX8878EUK29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8878EUK29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8878EUK29+T?
MAX8878EUK29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8878EUK29+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 MAX8878EUK29+T?
For technical support, including MAX8878EUK29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8878EUK29+T requirements.
6.How does Aetrix verify that MAX8878EUK29+T is sourced from the original manufacturer or authorized distributors?
All MAX8878EUK29+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 MAX8878EUK29+T meets industry standards.
7.What is the process for return or replacement of MAX8878EUK29+T?
All MAX8878EUK29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8878EUK29+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 MAX8878EUK29+T part is unused and in its original packaging.
Return procedure for MAX8878EUK29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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