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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:7,955
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Product details
Overview
MAX8875EUK33+T from Maxim Integrated is a 3.3V, 150mA low-dropout linear regulator with P-channel MOSFET pass element, 85µA no-load quiescent current, and active-low open-drain Power-OK (POK) output. It operates from +2.5V to +6.5V input, delivers ±1% output accuracy, and is optimized for battery-powered portable electronics including cellular phones and modems.
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), thermal shutdown threshold (+170°C), reverse-battery protection, 1µF ceramic capacitor compatibility, and guaranteed 150mA output under full temperature range.
Technical Context
The MAX8875EUK33+T employs an internal 1.25V bandgap reference and error amplifier driving a 1.1Ω (typ) P-channel MOSFET pass transistor - eliminating base-drive current and enabling load-independent 85µA quiescent supply current. Its POK comparator monitors regulated output voltage with hysteresis and activates below regulation during dropout, overcurrent, or thermal shutdown.
Shutdown logic disables regulation while maintaining ≤1µA supply current; reverse-battery protection limits reverse current to 1mA when VIN or SHDN falls below GND. The device requires no external feedback network due to factory-trimmed internal resistor divider for fixed 3.3V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% - eliminates need for external resistive feedback and ensures stable rail for 3.3V microcontrollers and RF front-ends. |
| Max Output Current | 150mA guaranteed - sufficient to power baseband processors, audio codecs, or small LCD controllers in portable devices. |
| Dropout Voltage | 110mV at 100mA load - enables operation down to VIN = 3.41V while maintaining regulation, extending usable battery life in single-cell Li-ion systems. |
| Quiescent Current | 85µA at no load - remains constant across load and input voltage, critical for standby current budgeting in always-on subsystems. |
| PSRR | 60dB at 100Hz - suppresses low-frequency noise from switching DC/DC converters or noisy battery sources feeding the LDO input. |
| Power-OK Threshold | ±5.3% hysteresis at VOUT falling - provides clean, glitch-free reset signaling during brown-out or startup without external RC timing components. |
| Thermal Shutdown | +170°C activation with +20°C hysteresis - protects against sustained overload while allowing pulsed recovery under intermittent fault conditions. |
Pinout & Package
MAX8875EUK33+T is housed in a 5-pin SOT23-5 package with exposed pad for thermal enhancement; GND pin serves dual role as electrical ground and heatsink - requires connection to large PCB copper area for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Regulator input | Accepts +2.5V to +6.5V supply; bypassed with 1µF ceramic capacitor to GND for stability and transient response. |
| 2 - GND | Ground / thermal pad | Reference node and primary heat path; must be soldered to ≥100mm² copper pour to maintain junction temperature within limit. |
| 3 - SHDN | Active-low enable | Pulled high to IN for normal operation; driven low to reduce supply current to ≤1µA for system-level power gating. |
| 4 - POK | Open-drain Power-OK | Asserts low when VOUT drops >5.3% below nominal; requires external 100kΩ pull-up to OUT for logic-compatible reset signaling. |
| 5 - OUT | Regulated output | Delivers fixed 3.3V ±1%; requires 1µF ceramic capacitor (ESR <0.2Ω) to GND for stability across -40°C to +85°C. |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Enables 85µA load-independent quiescent current and eliminates base-drive losses seen in PNP-based LDOs. |
| 1µF ceramic output capacitor support | Reduces BOM count and board space vs. larger tantalum or electrolytic capacitors; compatible with X7R/X5R dielectrics across full temp range. |
| Reverse-battery protection | Limits reverse current to ≤1mA if battery is inserted backward - prevents damage to downstream circuitry without external diode. |
| Thermal shutdown with hysteresis | Auto-recovers after 20°C cooldown, enabling fault-tolerant operation in thermally constrained enclosures without system lockup. |
| POK startup response down to VIN ≤1V | Generates valid reset signal even during ultra-low-voltage battery ramp-up - supports robust power-on sequencing in deep-discharge scenarios. |
Applications
| Cellular Phone Baseband Power | PCMCIA Card I/O Supply |
|---|---|
Use Scenario: Powers baseband processor core and memory interface in GSM/CDMA handsets operating from single-cell Li-ion battery (3.0V–4.2V). IC Role / Device Role / Timing Role: Primary 3.3V LDO delivering regulated rail with fast load-transient response to handle burst-mode RF transmission current spikes. Use Value: 110mV dropout at 100mA extends usable battery voltage down to 3.41V, increasing talk time by ~8% versus higher-dropout alternatives. |
Use Scenario: Supplies 3.3V I/O voltage to PCMCIA Type II cards in laptops and industrial handhelds with hot-swap capability. IC Role / Device Role / Timing Role: Isolated, short-circuit protected supply enabling safe card insertion/removal while maintaining host-side power integrity. Use Value: Indefinite short-circuit tolerance and reverse-battery protection prevent damage during card mating transients or polarity errors. |
| Modem Analog Front-End | Palmtop Computer System Rail |
Use Scenario: Provides clean 3.3V bias to analog line drivers, ADCs, and codec circuits in DSL/cable modems subject to AC-coupled noise from upstream power supplies. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO filtering switching noise from upstream DC/DC converter feeding the modem's digital core. Use Value: 60dB PSRR at 100Hz attenuates low-frequency ripple from 100kHz–500kHz buck converters, reducing ADC quantization error by >3 LSB. |
Use Scenario: Generates main 3.3V system rail in palmtop computers with tight PCB area constraints and aggressive thermal budgets. IC Role / Device Role / Timing Role: Compact, thermally efficient LDO supporting 150mA peak loads from ARM9-class applications processors and NAND flash controllers. Use Value: SOT23-5 package with thermal pad allows 571mW dissipation at +70°C ambient - enables continuous 150mA operation without derating in sealed enclosures. |
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; supports higher-ESR output capacitors (up to 10Ω) but requires larger 10µF minimum output capacitance. | Preferred where cost-sensitive designs use bulk aluminum or polymer capacitors instead of ceramics. | Select MAX8885EUK33+T only if ceramic capacitor sourcing is constrained; otherwise MAX8875EUK33+T offers lower BOM cost and smaller footprint. |
| MCP1700T-3302E/MB | 3.3V, 250mA, 1.6µA quiescent current; no POK output; SOT23-3 package (no SHDN or POK pins). | Suitable for simpler systems requiring only enable control and no power-good monitoring. | Choose MCP1700T-3302E/MB when POK functionality is unnecessary and board space permits SOT23-3; MAX8875EUK33+T remains required for reset generation and reverse-battery protection. |
Compared with MAX8885EUK33+T and MCP1700T-3302E/MB, the MAX8875EUK33+T uniquely combines POK signaling, reverse-battery protection, and 1µF ceramic compatibility in a 5-pin SOT23 - making it the only option among the three that satisfies simultaneous requirements for compact size, fault resilience, and system-level power sequencing in portable telecom equipment.
Availability
MAX8875EUK33+T is available at Aetrix Electronics and suitable for cellular telephones, PCMCIA cards, and modem analog front-ends requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
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 MAX8875EUK33+T belongs to Maxim's low-quiescent-current LDO family designed specifically for battery-powered portable equipment - prioritizing ultra-low standby current, small solution size, and robust fault protection over raw output current capability.
FAQ
What is the maximum input voltage rating for the MAX8875EUK33+T?
The MAX8875EUK33+T has an absolute maximum input voltage rating of +7V referenced to GND. However, its operational input voltage range is specified from +2.5V to +6.5V. Exceeding +6.5V may cause improper regulation or exceed safe power dissipation limits, especially at high output currents. Always ensure VIN stays within the recommended operating range for reliable performance of the MAX8875EUK33+T.
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 when the output is in regulation. A 100kΩ resistor pulled up to the OUT pin is recommended per the datasheet for minimal current consumption while ensuring adequate rise time. Leaving POK unconnected renders the power-good function nonoperational, so proper termination is essential for MAX8875EUK33+T system reset functionality.
Can the MAX8875EUK33+T operate with a 10µF output capacitor?
Yes, the MAX8875EUK33+T is stable with a 10µF ceramic or tantalum output capacitor, and doing so improves PSRR, load-transient response, and noise performance compared to the minimum 1µF requirement. The datasheet explicitly states that larger output capacitance enhances stability and filtering - particularly beneficial in noise-sensitive analog sections powered by the MAX8875EUK33+T. No compensation changes are needed when scaling up to 10µF.
What is the thermal shutdown behavior of the MAX8875EUK33+T during continuous overload?
The MAX8875EUK33+T activates thermal shutdown at +170°C junction temperature and remains latched off until the die cools by +20°C hysteresis. Under continuous overload, this results in pulsed output operation - cycling between regulation and shutdown - rather than permanent latch-off. This behavior protects the MAX8875EUK33+T from destruction but indicates inadequate PCB thermal design; sustained pulsing requires review of GND pad area, airflow, and power dissipation margins.
Is the MAX8875EUK33+T compatible with reverse-polarity battery connections?
Yes, the MAX8875EUK33+T includes integrated reverse-battery protection that limits reverse current to ≤1mA when VIN or SHDN falls below GND - preventing damage to the IC and downstream circuitry. This feature eliminates the need for an external series diode in battery-powered applications, preserving forward voltage headroom and efficiency. Reverse protection is active regardless of SHDN state and applies specifically to the MAX8875EUK33+T's internal architecture.
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:
- Active
- 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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