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Analog Devices Inc./Maxim Integrated MAX8878EUK36
- Part No.:
- MAX8878EUK36
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8878EUK36.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:1,875
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Product details
Overview
MAX8878EUK36 from Maxim Integrated is a low-noise, low-dropout linear regulator with fixed 3.6V output, delivering up to 150mA from a 2.5V–6.5V input. It features 30µVRMS output noise, 165mV dropout at 150mA, 100µA operating supply current (independent of load or dropout), and integrated auto-discharge functionality. It serves as a precision power source for battery-powered RF and analog circuitry in portable communications devices.
For engineers reviewing the MAX8878EUK36 datasheet, MAX8878EUK36 pinout, MAX8878EUK36 application, or MAX8878EUK36 equivalent, key selection criteria include its 3.6V preset accuracy (±1.4%), thermal shutdown at +155°C, reverse battery protection, 10nA shutdown current, and SOT23-5 regular package compatibility with industry-standard '2982 footprints.
Technical Context
The MAX8878EUK36 uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling ultra-low quiescent current across all operating conditions-including dropout-without base-drive losses. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin.
It integrates dedicated protection blocks: thermal shutdown with 15°C hysteresis, short-circuit current limiting (160–390mA), reverse battery protection limiting reverse current to 1mA, and-uniquely for the MAX8878 variant-an active auto-discharge path (300Ω) that pulls OUT to GND during shutdown. The BP pin enables noise reduction via a 0.01µF capacitor forming an 80Hz low-pass filter.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.6V ±1.4% over -40°C to +85°C; ensures stable biasing for 3.3V-tolerant RF ICs and microcontrollers without external feedback. |
| Max Output Current | 150mA continuous; sufficient for powering GSM/PCS transceivers, audio codecs, or sensor signal chains in handheld instruments. |
| Dropout Voltage | 165mV at 150mA; extends usable battery life down to ~3.76V input for single-cell Li-ion systems. |
| Output Noise | 30µVRMS (10Hz–100kHz); low enough to avoid degrading SNR in sensitive analog front-ends like ADC references or VCO supplies. |
| Quiescent Current | 100µA at full load and in dropout; maintains efficiency during deep discharge or standby modes without sacrificing regulation. |
| Shutdown Current | 10nA logic-controlled shutdown; enables true zero-power state for long-term storage or sleep modes in palmtop computers. |
| Auto-Discharge | 300Ω active discharge path (MAX8878 only); clears residual output charge within microseconds, preventing latch-up or leakage-induced wake-up in downstream logic. |
Pinout & Package
MAX8878EUK36 is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with exposed pad not electrically connected. The GND pin serves dual roles: electrical reference and primary thermal path-requiring connection to a large PCB copper area for optimal power dissipation (θJB = 140°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 sink | Must be soldered to large PCB ground plane to manage 571mW max power dissipation at +70°C ambient. |
| 3 - SHDN | Active-low enable/disable control | Pulls OUT to GND via internal 300Ω resistor when low; connect to IN for always-on operation. |
| 4 - BP | Bypass for reference noise reduction | Connects to 0.01µF ceramic capacitor to form 80Hz low-pass filter; reduces output noise by >50% vs. no BP cap. |
| 5 - OUT | Regulated 3.6V output | Sources up to 150mA; requires ≥1µF ceramic capacitor (ESR <0.2Ω) for VOUT ≥2.5V; stable with COUT ESR ≤1Ω at 150mA. |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current loss, enabling constant 100µA IQ across light/heavy load and dropout-critical for battery runtime predictability. |
| Auto-discharge (MAX8878 only) | 300Ω internal discharge path actively pulls OUT to GND in <1ms during shutdown, preventing floating outputs that could disrupt downstream CMOS inputs. |
| Reverse battery protection | Limits reverse current to ≤1mA if VIN or SHDN falls below GND, protecting the device and system from damage during incorrect battery insertion. |
| Thermal shutdown with hysteresis | Shuts down at +155°C and re-enables only after cooling by 15°C, preventing thermal oscillation while safeguarding silicon integrity under sustained overload. |
| BP pin noise filtering | Enables 30µVRMS output noise using only a 0.01µF ceramic capacitor-no ferrites or complex RC networks needed for clean analog supply rails. |
Applications
| Cellular Transceiver Power | Portable Audio Codec Supply |
|---|---|
|
Use Scenario: Powering RF power amplifier bias and VCO tuning voltage in GSM/PCS handsets during transmit bursts. IC Role / Device Role / Timing Role: Low-noise, fast transient-response LDO providing stable 3.6V rail isolated from noisy digital switching. Use Value: 30µVRMS noise prevents phase noise degradation in VCOs; 12mV load-step response (0→50mA) avoids AM-to-PM conversion in PA stages. |
Use Scenario: Supplying analog section of stereo audio codec in cordless telephones or electronic planners. IC Role / Device Role / Timing Role: Precision 3.6V reference for DAC/ADC bias and headphone driver stage. Use Value: ±1.4% output accuracy ensures consistent dynamic range; 100µA IQ minimizes idle power draw during voice standby. |
| PCMCIA Card Core Logic | Hand-Held Instrument Sensor Interface |
|
Use Scenario: Regulating 3.6V core voltage for PCMCIA card controllers and flash memory interfaces. IC Role / Device Role / Timing Role: Primary power source with reverse battery protection to prevent damage during hot-swap insertion. Use Value: Reverse battery current limited to 1mA protects card controller ICs; 150mA output supports burst-mode data transfers. |
Use Scenario: Powering precision op-amps and bridge sensors in battery-operated multimeters or environmental monitors. IC Role / Device Role / Timing Role: Ultra-low-noise analog supply decoupled from digital MCU domain. Use Value: 165mV dropout allows operation until Li-ion cell reaches 3.76V; auto-discharge clears residual voltage before sensor calibration cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8877EUK36 | No auto-discharge function; identical pinout, specs, and package-but lacks active output discharge during shutdown. | Preferred where output hold time is required post-shutdown (e.g., non-volatile register retention), or where discharge path could cause unintended reset. | Select MAX8877EUK36 only if auto-discharge is undesirable; otherwise MAX8878EUK36 provides safer system-level power sequencing. |
| Torex XC6206P362MR-G | 3.6V fixed output, 150mA, but higher 250mV dropout at 150mA and 45µVRMS noise; SOT23-5 pin-compatible with different pin mapping (SHDN on Pin 2, GND on Pin 3). | Not drop-in replaceable due to SHDN/GND pin swap; requires PCB layout change; suitable only for new designs prioritizing cost over noise/dropout. | Use only in cost-sensitive, non-noise-critical applications where board redesign is acceptable; MAX8878EUK36 offers superior noise, dropout, and protection integration. |
Compared with MAX8877EUK36, the MAX8878EUK36 adds critical auto-discharge for reliable power-down sequencing; versus XC6206P362MR-G, it delivers lower noise, tighter accuracy, and true pin-compatible '2982 footprint compliance-enabling direct replacement without layout changes.
Availability
MAX8878EUK36 is available at Aetrix Electronics and suitable for cellular telephones, PCMCIA cards, and hand-held instruments requiring stable component supply, long-lifecycle support, and guaranteed parametric performance across industrial temperature ranges.
Supply support for MAX8878EUK36 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 noise, minimal quiescent current, and robust fault protection in space-constrained SOT23-5 packages.
FAQ
What is the output voltage tolerance of the MAX8878EUK36 over temperature and load?
The MAX8878EUK36 delivers 3.6V output with ±1.4% accuracy across the full -40°C to +85°C operating temperature range and for load currents from 0.1mA to 120mA. This specification is guaranteed by production testing and statistical correlation-not just typical values-ensuring consistent performance in real-world portable equipment environments where thermal cycling and varying battery loads occur.
Does the MAX8878EUK36 require external components to operate stably?
Yes-the MAX8878EUK36 requires three external capacitors: a 1µF ceramic capacitor on IN to GND, a 1µF (minimum) ceramic capacitor on OUT to GND (with ESR <0.2Ω), and a 0.01µF ceramic capacitor on BP to GND. These are mandatory for stability, noise reduction, and transient response; omitting the BP capacitor increases output noise to >50µVRMS, while undersized COUT risks oscillation under load steps.
How does the auto-discharge feature of the MAX8878EUK36 function during shutdown?
When the SHDN pin is pulled low, the MAX8878EUK36 activates an internal 300Ω discharge path between OUT and GND, actively pulling the output voltage to ground within microseconds. This behavior is exclusive to the MAX8878 series (not present in MAX8877) and prevents residual charge from interfering with downstream logic states or causing unintended wake-up events in battery-powered systems.
Can the MAX8878EUK36 be used with input voltages below 2.5V?
No-the MAX8878EUK36 has a minimum specified input voltage 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 start up. For sub-2.5V battery systems (e.g., single Alkaline), alternative regulators such as the MAX8860 series must be considered.
What thermal derating applies to the MAX8878EUK36 in its SOT23-5 regular package?
In the SOT23-5 regular package, the MAX8878EUK36 has a junction-to-board thermal resistance (θJB) of 140°C/W and a maximum continuous power dissipation of 571mW at +70°C ambient. Above +70°C, power dissipation must be linearly derated by 7.1mW/°C-meaning at +85°C ambient, maximum allowable power drops to 465mW, corresponding to ~129mA at 165mV dropout (VIN = 3.765V).
MAX8878EUK36 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):
- 3.6V
- 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
MAX8878EUK36 FAQ
1.How can I place an order for MAX8878EUK36 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8878EUK36 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 MAX8878EUK36 reliable?
The price and inventory of MAX8878EUK36 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8878EUK36 is usually 5 days.
3.What payment methods are accepted for MAX8878EUK36?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8878EUK36 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8878EUK36?
MAX8878EUK36 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8878EUK36 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 MAX8878EUK36?
For technical support, including MAX8878EUK36 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8878EUK36 requirements.
6.How does Aetrix verify that MAX8878EUK36 is sourced from the original manufacturer or authorized distributors?
All MAX8878EUK36 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 MAX8878EUK36 meets industry standards.
7.What is the process for return or replacement of MAX8878EUK36?
All MAX8878EUK36 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8878EUK36, 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 MAX8878EUK36 part is unused and in its original packaging.
Return procedure for MAX8878EUK36:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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