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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 LDO
- Quantity:
- Payment:
- Shipping:
Inventory:12,500
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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 maximum output current, 165mV dropout at full load, 30µVRMS output noise, and 100µA operating supply current. It integrates an internal P-channel MOSFET pass transistor and auto-discharge functionality, targeting battery-powered portable electronics requiring stable, ultra-low-noise voltage regulation.
For engineers reviewing the MAX8878EUK29-T datasheet, MAX8878EUK29-T pinout, MAX8878EUK29-T application, or MAX8878EUK29-T equivalent, key selection criteria include dropout performance at 150mA, shutdown leakage (10nA), auto-discharge resistance (300Ω), ±1.4% output accuracy over temperature, and SOT23-5 regular package compatibility with industry-standard '2982 footprint.
Technical Context
The MAX8878EUK29-T uses a P-channel MOSFET pass element with ~1.1Ω RDS(ON), enabling low dropout and eliminating base-drive current loss. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin.
It features dedicated BP pin with internal 200kΩ resistor forming an 80Hz low-pass filter for noise reduction when paired with 0.01µF ceramic capacitor. The MAX8878 variant adds active output discharge via 300Ω internal switch during SHDN assertion - a function absent in MAX8877.
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 triggers at 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; reduced further with 0.01µF BP cap; suitable for RF/ADC power rails) |
| Quiescent Current | 100µA (constant across load and dropout; enables >1-year battery life in 10µA standby systems) |
| Shutdown Current | 10nA (logic-controlled; allows deep sleep in portable devices without external switches) |
| Auto-Discharge | 300Ω internal discharge path (actively pulls OUT to GND in SHDN; eliminates hold-up voltage in safety-critical shutdowns) |
Pinout & Package
MAX8878EUK29-T is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with exposed pad not electrically connected. Pin 2 (GND) serves dual role as circuit ground and thermal heatsink - requires soldering to PCB ground plane for thermal reliability.
| 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 path | Must connect to large copper area; determines θJB = 140°C/W and max power dissipation (571mW @ +70°C) |
| 3 SHDN | Active-low enable/disable control | Logic low (≤0.4V) disables regulator and activates auto-discharge; tie to IN for always-on operation |
| 4 BP | Bypass node for noise filtering | Connects internally to 200kΩ resistor; 0.01µF ceramic cap reduces output noise by filtering reference noise |
| 5 OUT | Regulated output terminal | Delivers up to 150mA; requires ≥1µF (VOUT ≥2.5V) or ≥3.3µF (VOUT <2.5V) ceramic cap with <0.2Ω ESR |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass transistor | Eliminates base-drive current loss; maintains 100µA IQ even in dropout or heavy load - extends battery runtime |
| Auto-discharge function | 300Ω internal switch actively discharges OUT to GND during SHDN - prevents unintended wake-up or latch-up in safety systems |
| Reverse battery protection | Limits reverse current to ≤1mA if VIN or SHDN falls below GND - protects device and system during incorrect battery insertion |
| Thermal shutdown with hysteresis | Triggers at +155°C (±5°C); re-enables after 15°C cooldown - prevents thermal runaway while allowing pulsed recovery under overload |
| Low-noise BP pin architecture | Internal 200kΩ + external 0.01µF forms 80Hz filter; achieves 30µVRMS noise - meets stringent analog/RF supply requirements |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
|
Use Scenario: Powering RF transceiver LDO rail in GSM/EDGE handset during burst transmission. IC Role / Device Role / Timing Role: Primary 2.84V supply for PA driver stage; regulates against battery sag and switching noise. Use Value: 165mV dropout preserves headroom at 3.0V battery cutoff; 30µVRMS noise avoids RX desensitization. |
Use Scenario: Providing clean 2.84V bias to PCMCIA card controller and interface logic. IC Role / Device Role / Timing Role: Local point-of-load regulator isolating card from noisy host bus voltage. Use Value: Auto-discharge ensures rapid VCC ramp-down on hot-unplug; 10nA shutdown enables zero-power card retention. |
| Palmtop Computers | Electronic Planners |
|
Use Scenario: Supplying 2.84V to microcontroller core and SRAM in battery-operated palmtop. IC Role / Device Role / Timing Role: Main system LDO delivering regulated voltage during CPU active/idle cycles. Use Value: 100µA constant IQ enables multi-week standby; ±1.4% accuracy ensures reliable brown-out detection. |
Use Scenario: Powering real-time clock (RTC) and memory backup circuitry in planner devices. IC Role / Device Role / Timing Role: Low-noise, low-IQ regulator maintaining timekeeping voltage during main battery removal. Use Value: 10nA shutdown current minimizes coin-cell drain; reverse battery protection prevents RTC corruption during battery swap. |
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, specs, and package; 10nA shutdown but passive OUT discharge only | Suitable where controlled shutdown timing is not required; lower cost where discharge path is externally managed | Select MAX8877EUK29-T if auto-discharge is unnecessary and BOM cost optimization is prioritized |
| MCP1700T-2802E/TT | 2.8V output (vs. 2.84V); 250mA rating; higher 175mV dropout at 250mA; no BP pin or auto-discharge | Higher current capability but less precision and noise performance; lacks active discharge for safety-critical shutdown | Choose MCP1700T-2802E/TT only for non-sensitive digital loads where 40mV output offset and absence of discharge are acceptable |
Compared with MAX8878EUK29-T, MAX8877EUK29-T omits auto-discharge but matches all electrical and mechanical specs - ideal for cost-sensitive designs without safety discharge mandates. MCP1700T-2802E/TT trades precision, noise, and discharge capability for higher current and broader vendor availability, requiring layout and system-level validation for equivalent functionality.
Availability
MAX8878EUK29-T is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, palmtop computers, and electronic planners requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
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 demanding applications.
The MAX8877/MAX8878 product line was designed specifically for battery-powered portable electronics requiring ultra-low quiescent current, low noise, and robust protection - emphasizing runtime extension and signal integrity in space-constrained devices.
FAQ
What is the exact output voltage of MAX8878EUK29-T and how is it trimmed?
The MAX8878EUK29-T delivers a factory-trimmed output voltage of 2.84V with ±1.4% accuracy over -40°C to +85°C and 0.1–120mA load. This value is set by laser-trimming internal feedback resistors during wafer test; no external components are needed to achieve this precision. The '29' suffix explicitly denotes the 2.84V variant per Maxim's expanded ordering table - distinct from standard 100mV increments.
Does MAX8878EUK29-T require an external bypass capacitor on the BP pin, and why?
Yes, MAX8878EUK29-T requires a 0.01µF ceramic capacitor between BP and GND. This capacitor forms a low-pass filter with the internal 200kΩ resistor to suppress reference noise, directly enabling the specified 30µVRMS output noise. Omitting it increases noise by >2×; using >0.1µF degrades startup time and shutdown exit delay without meaningful noise benefit, as confirmed in Typical Operating Characteristics Figure 14.
How does the auto-discharge function work in MAX8878EUK29-T during shutdown?
When SHDN is pulled low, MAX8878EUK29-T activates an internal 300Ω NMOS switch between OUT and GND, actively discharging the output capacitance. This differs from passive discharge in MAX8877 variants. Measured shutdown exit delay depends on CBP value (e.g., 300µs with 0.01µF), and discharge rate is governed by RC time constant of COUT and 300Ω - critical for meeting system-level safety discharge timing requirements.
What thermal derating applies to MAX8878EUK29-T in SOT23-5 regular package?
MAX8878EUK29-T in SOT23-5 regular has θJB = 140°C/W and 571mW maximum continuous power dissipation at +70°C ambient. Above +70°C, power must be derated by 7.1mW/°C. Effective thermal performance requires soldering Pin 2 (GND) to ≥100mm² copper area; insufficient copper raises junction temperature and risks thermal shutdown activation at <150mA load under worst-case VIN–VOUT conditions.
Can MAX8878EUK29-T operate with input voltage below 2.5V?
No - MAX8878EUK29-T has a minimum input voltage specification of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V is undefined and may result in loss of regulation, increased dropout, or failure to maintain 2.84V output. For sub-2.5V inputs, alternative regulators such as MAX8212 or MAX1725 series must be evaluated, as MAX8878EUK29-T is not characterized or guaranteed in that range.
MAX8878EUK29-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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:
- -
- 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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