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Analog Devices Inc./Maxim Integrated MAX8878EZK45+T
- Part No.:
- MAX8878EZK45+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8878EZK45+T.pdf
- Description:
- IC REG LIN 4.5V 150MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,062
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Product details
Overview
MAX8878EZK45+T from Maxim Integrated is a low-noise, low-dropout linear regulator with preset 4.5V output, delivering up to 150mA from 2.5V–6.5V input. It features 30µVRMS output noise, 165mV dropout at 150mA, and 100µA operating supply current - designed for battery-powered portable electronics requiring stable, clean voltage rails.
For engineers reviewing the MAX8878EZK45+T datasheet, MAX8878EZK45+T pinout, MAX8878EZK45+T application, or MAX8878EZK45+T equivalent, key selection criteria include its thin SOT23-5 package, auto-discharge shutdown function, ±1.4% output accuracy, and compatibility with industry-standard '2982 footprint.
Technical Context
The MAX8878EZK45+T uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling low dropout and load-independent 100µA quiescent current. 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 (limits reverse current to 1mA), thermal shutdown at +155°C with 15°C hysteresis, and a dedicated BP pin for 0.01µF bypass capacitor to reduce output noise via an internal 200kΩ filter network. The MAX8878 variant adds active output discharge during shutdown via a 300Ω internal resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.5V preset (±1.4% accuracy over -40°C to +85°C) - eliminates external feedback resistors and ensures stable rail for 4.5V logic or analog circuitry. |
| Max Output Current | 150mA - sufficient for powering microcontrollers, RF front-ends, or sensor signal chains in compact portable devices. |
| Dropout Voltage | 165mV at 150mA - enables operation down to 4.665V input, extending usable battery life in single-cell Li-ion or multi-cell alkaline systems. |
| Output Noise | 30µVRMS (10Hz–100kHz, CBP=0.01µF, COUT=10µF) - low enough for noise-sensitive analog circuits like ADC references or RF VCOs. |
| Supply Current | 100µA (operating, any load/dropout condition) - minimizes standby power draw in always-on subsystems. |
| Shutdown Current | 10nA logic-controlled shutdown - reduces system-level leakage during deep sleep modes. |
| Auto-Discharge | Active output discharge via 300Ω path to GND when SHDN = low - prevents floating outputs and unintended biasing of downstream circuitry. |
Pinout & Package
MAX8878EZK45+T is housed in a thin 5-pin SOT23 package (JEDEC MO-178AA), optimized for space-constrained PCB layouts and improved thermal performance (θJB = 110°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input voltage supply | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass to GND for stability and line-transient suppression. |
| 2 GND | Ground reference and thermal path | Electrical ground and primary heat dissipation path - must connect to large copper area or ground plane. |
| 3 SHDN | Active-low enable/disable control | Pulling low disables regulation and triggers auto-discharge on MAX8878; connect to IN for always-on operation. |
| 4 BP | Bypass reference noise node | Connects to 0.01µF ceramic capacitor to reduce reference noise; determines startup time and output spectral density. |
| 5 OUT | Regulated output | Delivers up to 150mA at 4.5V; requires ≥1µF (ESR < 0.2Ω) ceramic capacitor for VOUT ≥ 2.5V applications. |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current loss, enabling constant 100µA IQ across all load and dropout conditions - critical for battery runtime. |
| Auto-discharge function (MAX8878 only) | 300Ω internal discharge path actively pulls OUT to GND during shutdown - avoids latch-up or false triggering in downstream CMOS inputs. |
| Reverse battery protection | Blocks reverse current to ≤1mA when VIN or SHDN falls below GND - protects IC and system during incorrect battery insertion. |
| Thermal shutdown with hysteresis | Shuts down at +155°C and re-enables after cooling by 15°C - provides fault-tolerant operation without requiring external reset circuitry. |
| Low-noise BP pin architecture | Internal 200kΩ resistor + external 0.01µF capacitor forms 80Hz low-pass filter on reference - reduces integrated output noise to 30µVRMS. |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
|
Use Scenario: Powering baseband processor core voltage and RF transceiver bias rails in dual-mode GSM/CDMA handsets. IC Role / Device Role / Timing Role: Primary LDO supplying clean 4.5V to sensitive analog sections while maintaining tight regulation during RF transmit bursts. Use Value: 30µVRMS noise and 165mV dropout extend talk time and prevent RF desense caused by supply modulation. |
Use Scenario: Providing regulated 4.5V to memory controllers and interface logic in hot-pluggable PCMCIA Type II cards. IC Role / Device Role / Timing Role: Local point-of-load regulator ensuring stable voltage during card insertion/removal and bus arbitration events. Use Value: Auto-discharge clears residual charge on VOUT before card removal, preventing bus contention or data corruption. |
| Palmtop Computers | Electronic Planners |
|
Use Scenario: Supplying 4.5V to LCD bias generators and touch-screen controller ASICs in palm-sized PDAs. IC Role / Device Role / Timing Role: Low-quiescent LDO supporting always-on real-time clock and memory retention during suspend-to-RAM states. Use Value: 10nA shutdown current and 100µA operating current minimize battery drain during multi-day standby. |
Use Scenario: Regulating power for microcontroller peripherals and EEPROM interfaces in handheld scheduling devices. IC Role / Device Role / Timing Role: Compact, pin-compatible replacement for legacy '2982-based supplies in cost-optimized consumer designs. Use Value: Thin SOT23-5 footprint and '2982 pinout allow drop-in upgrade without PCB redesign or layout changes. |
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 |
|---|---|---|---|
| MAX8877EZK45+T | No auto-discharge; identical pinout, specs, and package - differs only in missing active output discharge path. | Suitable where shutdown discharge is unnecessary (e.g., non-critical logic rails), but not for systems requiring fast VOUT decay. | Select MAX8877EZK45+T only if auto-discharge is unused - otherwise MAX8878EZK45+T provides safer system behavior. |
| MCP1703T-4502E/MB | Higher 250mV dropout at 150mA; 45µVRMS noise; no BP pin or auto-discharge; SOT23-5 but different pin assignment (SHDN on Pin 2). | Requires PCB layout change due to non-pin-compatible pinout; better suited for cost-driven industrial sensors than portable RF systems. | Use MCP1703T-4502E/MB only in new designs with flexible layout - not a drop-in replacement for MAX8878EZK45+T. |
Compared with MAX8877EZK45+T, the MAX8878EZK45+T adds essential auto-discharge for safe shutdown in portable systems, while the MCP1703T-4502E/MB trades noise and dropout performance for lower cost but requires board redesign - making MAX8878EZK45+T the optimal choice for space- and noise-constrained battery-powered applications.
Availability
MAX8878EZK45+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 MAX8878EZK45+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 engineered specifically for ultra-low-noise, low-quiescent-current regulation in battery-powered portable electronics - prioritizing efficiency, small size, and robust protection features.
FAQ
What is the output voltage tolerance of the MAX8878EZK45+T over temperature and load?
The MAX8878EZK45+T guarantees ±1.4% output voltage accuracy across -40°C to +85°C and for load currents from 0.1mA to 120mA. At 25°C and light load, typical deviation is ±1.0%. This tight tolerance ensures reliable operation of 4.5V-tolerant logic and analog components without external trimming.
Does the MAX8878EZK45+T require an external BP capacitor, and what happens if it's omitted?
Yes, the MAX8878EZK45+T requires a 0.01µF ceramic capacitor between BP and GND to achieve its specified 30µVRMS output noise. Omitting it increases output noise to ~100µVRMS, degrading performance in noise-sensitive applications like RF biasing or precision ADC references.
How does the auto-discharge function operate in the MAX8878EZK45+T during shutdown?
When SHDN is pulled low, the MAX8878EZK45+T activates an internal 300Ω discharge path from OUT to GND, pulling the output voltage to near-zero within microseconds. This prevents floating nodes and unintended turn-on of downstream FETs or logic - a feature absent in the MAX8877 variant.
Can the MAX8878EZK45+T be used with input voltages below 2.5V?
No - the MAX8878EZK45+T has a minimum input voltage rating of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this risks improper regulation, increased dropout, or failure to maintain 4.5V output, especially under load.
Is the MAX8878EZK45+T pin-compatible with the industry-standard '2982 regulator?
Yes - the MAX8878EZK45+T uses the same 5-pin SOT23 pinout as the industry-standard '2982 family, including identical IN, GND, SHDN, BP, and OUT assignments. This allows direct substitution in existing '2982-based designs without layout modification.
MAX8878EZK45+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):
- 4.5V
- 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
MAX8878EZK45+T FAQ
1.How can I place an order for MAX8878EZK45+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8878EZK45+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 MAX8878EZK45+T reliable?
The price and inventory of MAX8878EZK45+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8878EZK45+T is usually 5 days.
3.What payment methods are accepted for MAX8878EZK45+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8878EZK45+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8878EZK45+T?
MAX8878EZK45+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8878EZK45+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 MAX8878EZK45+T?
For technical support, including MAX8878EZK45+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8878EZK45+T requirements.
6.How does Aetrix verify that MAX8878EZK45+T is sourced from the original manufacturer or authorized distributors?
All MAX8878EZK45+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 MAX8878EZK45+T meets industry standards.
7.What is the process for return or replacement of MAX8878EZK45+T?
All MAX8878EZK45+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8878EZK45+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 MAX8878EZK45+T part is unused and in its original packaging.
Return procedure for MAX8878EZK45+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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