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Analog Devices Inc./Maxim Integrated MAX8875EUK33-T
- Part No.:
- MAX8875EUK33-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8875EUK33-T.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,920
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Product details
Overview
The MAX8875EUK33-T from Maxim Integrated is a 3.3V, 150mA low-dropout linear regulator with P-channel MOSFET pass device, 85µA no-load quiescent current, and active-low open-drain Power-OK (POK) output - designed for battery-powered portable electronics requiring stable low-voltage rail generation and supply monitoring.
For engineers reviewing the MAX8875EUK33-T datasheet, MAX8875EUK33-T pinout, MAX8875EUK33-T application, or MAX8875EUK33-T equivalent, key selection criteria include dropout voltage at 100mA (110mV), ±1% output accuracy over temperature, reverse-battery protection, thermal shutdown at +170°C, and compatibility with 1µF ceramic output capacitors.
Technical Context
The MAX8875EUK33-T employs a 1.25V bandgap reference and error amplifier to regulate its fixed 3.3V output via internal resistor feedback. Its P-channel MOSFET pass transistor (typ. RDS(ON) ≈ 1.1Ω) eliminates base-drive current, enabling load-independent 85µA quiescent current across 0–150mA load range.
Power-OK (POK) is an open-drain comparator output that asserts low when VOUT falls >1% below nominal due to dropout, current limit, or thermal shutdown. POK remains inactive during SHDN assertion and supports power-on-reset functionality down to VIN ≤1V with external RC timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% over -40°C to +85°C - ensures precise rail for 3.3V logic, RF front-ends, and analog subsystems. |
| Max Output Current | 150mA guaranteed - sufficient for baseband processors, LCD bias, and low-power microcontrollers in handheld devices. |
| Dropout Voltage | 110mV at 100mA load - enables operation down to VIN = 3.41V, extending usable battery life in single-cell Li-ion or dual-cell alkaline systems. |
| Quiescent Current | 85µA at no load - remains constant across load and input voltage, critical for standby current budgeting in always-on modules. |
| PSRR | 60dB at 100Hz - suppresses low-frequency noise from switching converters or noisy DC sources feeding the LDO input. |
| Shutdown Current | 1µA max - reduces system-level leakage during deep sleep, supporting multi-week battery shelf life in portable instruments. |
| Protection Features | Reverse-battery (≤1mA reverse current), thermal shutdown (+170°C trip, +20°C hysteresis), short-circuit, and current limit (160mA min). |
Pinout & Package
Package: 5-pin SOT23-5 (JEDEC MO-178AA), 2.9mm × 1.6mm footprint, exposed pad not electrically connected - requires soldering GND pin to PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Regulator input | Accepts 2.5V–6.5V supply; bypass with 1µF ceramic capacitor to GND for stability. |
| 2 - GND | Ground reference & thermal path | Electrical return and primary heat sink - must connect to large copper area for power dissipation up to 571mW. |
| 3 - SHDN | Active-low enable control | Logic low disables regulator and reduces IQ to ≤1µA; tie to IN for always-on operation. |
| 4 - POK | Open-drain Power-OK monitor | Asserts low when VOUT deviates >1%; requires external 100kΩ pull-up to OUT for logic-level signaling. |
| 5 - OUT | Regulated 3.3V output | Delivers up to 150mA; stabilized by 1µF ceramic capacitor (ESR <0.2Ω) to GND per design guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current, enabling 85µA IQ independent of load - extends battery runtime in intermittent-use devices. |
| 1µF ceramic output capacitor support | Reduces BOM count and board space vs. larger tantalum or electrolytic caps; compatible with X7R/X5R dielectrics across full temp range. |
| Reverse-battery protection | Limits reverse current to ≤1mA if VIN or SHDN falls below GND - prevents damage during battery insertion errors in consumer handsets. |
| Power-OK with POR capability | Generates reliable reset signal even at VIN ≤1V using external RC on POK - eliminates need for separate supervisor IC in space-constrained designs. |
| Thermal shutdown with hysteresis | +170°C trip / +150°C recovery enables safe pulsed operation under sustained overload - protects against PCB trace overheating in sealed enclosures. |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
|
Use Scenario: Powering baseband processor I/O rails and RF transceiver bias in GSM/CDMA handsets with single Li-ion cell (2.7V–4.2V). IC Role / Device Role / Timing Role: Primary 3.3V LDO delivering regulated supply and real-time POK status to system controller for brownout detection. Use Value: 110mV dropout at 100mA allows >15% longer talk time before cutoff vs. legacy PNP-based regulators with 300mV+ dropout. |
Use Scenario: Providing clean 3.3V supply to PC Card interface logic and flash memory controllers in laptop expansion slots. IC Role / Device Role / Timing Role: Local point-of-load regulator with POK monitoring to coordinate card insertion/removal sequencing and prevent data corruption. Use Value: 1µA shutdown current enables zero-power card retention mode - meets PCMCIA 2.1 hot-swap specification for <10µA slot leakage. |
| Palmtop Computers | Electronic Planners |
|
Use Scenario: Supplying 3.3V to ARM7-based application processor and touchscreen controller in sub-200g handheld PDAs. IC Role / Device Role / Timing Role: Low-noise, low-IQ voltage source with integrated reverse-battery protection for user-replaceable AA/AAA battery compartments. Use Value: 60dB PSRR at 100Hz rejects ripple from boost converters powering display backlight - eliminates visible screen flicker during video playback. |
Use Scenario: Regulating 3.3V for real-time clock (RTC), SRAM backup, and IR transceiver in battery-backed personal organizers. IC Role / Device Role / Timing Role: Always-on LDO with POK used as wake-up trigger for RTC alarm events and low-power interrupt handling. Use Value: 85µA quiescent current enables >6-month calendar operation on CR2032 coin cell - verified per typical operating characteristics at 25°C and 85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8885EUK33-T | Pin-compatible, optimized for higher-ESR output capacitors (e.g., tantalum); 120mV dropout at 100mA; same 3.3V ±1% accuracy. | Preferred where board layout constraints require ≥10µF output capacitance or legacy capacitor sourcing mandates higher ESR. | Select MAX8885EUK33-T only if 1µF ceramic stability cannot be guaranteed - otherwise MAX8875EUK33-T offers lower cost and smaller footprint. |
| MCP1700T-3302E/TT | 3.3V, 250mA, 1.6µA IQ, SOT23-3 package; no POK output; 170mV dropout at 250mA; lacks reverse-battery protection. | Suitable for cost-sensitive, non-critical applications without supply monitoring or reverse-polarity risk. | Choose MCP1700T-3302E/TT only when POK, reverse-battery protection, and ultra-low IQ are unnecessary - MAX8875EUK33-T provides superior system-level reliability. |
Compared with MAX8885EUK33-T and MCP1700T-3302E/TT, the MAX8875EUK33-T uniquely balances ultra-low quiescent current (85µA), integrated POK monitoring, reverse-battery protection, and 1µF ceramic compatibility - making it optimal for battery-critical portable designs where supply integrity and runtime are co-prioritized.
Availability
MAX8875EUK33-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 parametric performance across industrial temperature range.
Supply support for MAX8875EUK33-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 MAX8875 series was developed specifically for battery-powered portable equipment - emphasizing ultra-low quiescent current, small footprint, and integrated supply-monitoring features to simplify power architecture in space- and energy-constrained devices.
FAQ
What is the guaranteed output voltage accuracy of the MAX8875EUK33-T over temperature?
The MAX8875EUK33-T guarantees ±1% output voltage accuracy over the full operating temperature range of -40°C to +85°C. This specification is production-tested at +25°C and correlated across temperature using Statistical Quality Control methods. At +25°C, typical deviation is within ±0.5%, and output drift versus temperature is characterized in Figure MAX8875toc07 - showing <10mV variation from -40°C to +85°C at no load and 150mA load conditions. The MAX8875EUK33-T achieves this stability through a precision 1.25V bandgap reference and trimmed internal feedback divider.
Can the MAX8875EUK33-T operate with input voltages below 2.5V?
No, the MAX8875EUK33-T has a minimum specified input voltage of +2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V is not guaranteed and may result in loss of regulation, undefined POK behavior, or failure to maintain 3.3V output. The device's internal circuitry - including the 1.25V reference and error amplifier - requires sufficient headroom to function correctly. While POK startup response is specified down to VIN ≤1V, this applies only to the POK comparator's ability to assert after power-on, not to sustained regulation. For sub-2.5V operation, consider alternative regulators such as the MAX8526 series.
Does the MAX8875EUK33-T require an external pull-up resistor on the POK pin?
Yes, the MAX8875EUK33-T POK pin is an open-drain N-channel MOSFET output and requires an external pull-up resistor to generate a valid logic-high level. A 100kΩ resistor connected from POK to OUT is recommended per the datasheet for most applications, balancing current consumption (<33µA at 3.3V) and rise time. Leaving POK unconnected renders the signal non-functional. If interfacing with a 5V logic system, pull to 5V instead - but ensure VPOK does not exceed 6.5V absolute maximum rating. The MAX8875EUK33-T POK function is disabled during shutdown (SHDN = low).
What is the thermal performance of the MAX8875EUK33-T in SOT23-5 package?
The MAX8875EUK33-T in SOT23-5 has a junction-to-ambient thermal resistance (θJA) of +140°C/W under standard JEDEC test conditions. Its maximum continuous power dissipation is 571mW at +70°C ambient, derating 7.1mW/°C above that. Real-world performance depends heavily on PCB layout: soldering the GND pin to a ≥100mm² copper pour reduces θJA significantly. Thermal shutdown activates at +170°C junction temperature with +20°C hysteresis, allowing pulsed operation under overload. The MAX8875EUK33-T's GND pin serves dual electrical and thermal roles - inadequate grounding will cause premature thermal limiting and output droop.
Is the MAX8875EUK33-T compatible with 10µF output capacitors?
Yes, the MAX8875EUK33-T is stable with 10µF output capacitors, and doing so improves PSRR, load-transient response, and noise suppression - as confirmed in Typical Operating Characteristics (Figures MAX8875toc09 and MAX8875toc11). However, the minimum recommended value is 1µF ceramic (X7R/X5R, ESR <0.2Ω) for VOUT ≥2.5V. Larger values are acceptable but do not degrade stability. Avoid Z5U/Y5V dielectrics below -10°C unless capacitance is doubled, due to temperature-dependent ESR shifts. The MAX8875EUK33-T's internal compensation is optimized for 1µF, so 10µF use is a design enhancement, not a requirement.
MAX8875EUK33-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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.165V @ 150mA (Typ)
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (100Hz)
- Control Features:
- Enable, Power Good
- Protection Features:
- 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
MAX8875EUK33-T FAQ
1.How can I place an order for MAX8875EUK33-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8875EUK33-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 MAX8875EUK33-T reliable?
The price and inventory of MAX8875EUK33-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8875EUK33-T is usually 5 days.
3.What payment methods are accepted for MAX8875EUK33-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8875EUK33-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8875EUK33-T?
MAX8875EUK33-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8875EUK33-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 MAX8875EUK33-T?
For technical support, including MAX8875EUK33-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8875EUK33-T requirements.
6.How does Aetrix verify that MAX8875EUK33-T is sourced from the original manufacturer or authorized distributors?
All MAX8875EUK33-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 MAX8875EUK33-T meets industry standards.
7.What is the process for return or replacement of MAX8875EUK33-T?
All MAX8875EUK33-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8875EUK33-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 MAX8875EUK33-T part is unused and in its original packaging.
Return procedure for MAX8875EUK33-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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