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Analog Devices Inc./Maxim Integrated MAX8875EUK33
- Part No.:
- MAX8875EUK33
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8875EUK33.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:4,273
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Product details
Overview
MAX8875EUK33 from Maxim Integrated is a 3.3V fixed-output, 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. It operates from +2.5V to +6.5V input, delivers ±1% output accuracy over temperature, and is optimized for battery-powered portable electronics including cellular phones and modems.
For engineers reviewing the MAX8875EUK33 datasheet, MAX8875EUK33 pinout, MAX8875EUK33 application, or MAX8875EUK33 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 current under full temperature range.
Technical Context
The MAX8875EUK33 implements a bandgap-referenced error amplifier driving a 1.1Ω typical P-channel MOSFET pass transistor, enabling load-independent quiescent current and eliminating base-drive losses inherent in PNP-based LDOs. Its internal feedback divider is factory-trimmed for 3.3V output, eliminating external resistors.
Power-OK functionality uses an open-drain N-channel comparator referenced to 95% of nominal VOUT, asserting low during dropout, current limit, or thermal shutdown - but inactive during SHDN assertion. The GND pin serves dual roles: circuit reference and thermal conduction path to PCB ground plane.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% over -40°C to +85°C - eliminates external feedback network and ensures stable rail for 3.3V logic and RF sections. |
| Max Output Current | 150mA guaranteed - sufficient for baseband processors, RF transceivers, and peripheral ICs in handheld devices. |
| Dropout Voltage | 110mV at 100mA load - enables operation down to VIN = 3.41V while maintaining regulation, extending usable battery life in Li-ion and multi-cell alkaline systems. |
| Quiescent Current | 85µA at no load - remains constant across load and input voltage, critical for standby power budgeting in always-on subsystems. |
| PSRR | 60dB at 100Hz - suppresses low-frequency supply ripple from switching converters or noisy battery sources feeding sensitive analog circuits. |
| Shutdown Current | 1µA maximum - reduces system-level standby consumption when host MCU disables power rails via SHDN pin. |
| Thermal Shutdown | +170°C trip with +20°C hysteresis - provides fault-safe current limiting during sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
MAX8875EUK33 is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), with exposed pad not electrically connected - thermal performance relies on GND pin soldering to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Regulator input supply | Accepts +2.5V to +6.5V; requires 1µF ceramic bypass to GND; feeds internal pass transistor and bias circuitry. |
| 2 - GND | Ground reference and thermal path | Primary return for load current and internal circuitry; must be soldered to large copper area for thermal dissipation and noise immunity. |
| 3 - SHDN | Active-low enable control | Logic low (<0.4V) places device in ultra-low-power shutdown (≤1µA); tied to IN for always-on operation. |
| 4 - POK | Open-drain Power-OK status | Asserts low when VOUT falls below 95% of 3.3V due to dropout, overload, or thermal fault; requires external 100kΩ pull-up to OUT. |
| 5 - OUT | Regulated 3.3V output | Delivers up to 150mA; stabilized by 1µF ceramic capacitor (ESR <0.2Ω); connects to internal feedback divider for fixed output. |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current loss, enabling constant 85µA IQ across load, input, and temperature - 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 operating temperature range. |
| Reverse-battery protection | Limits reverse current to ≤1mA if VIN or SHDN falls below GND - prevents damage during incorrect battery insertion in consumer handhelds. |
| Power-OK with POR capability | POK asserts low during startup until VOUT reaches 95% of 3.3V and remains stable; supports clean microcontroller reset sequencing even with slow-rising input supplies. |
| Short-circuit and thermal protection | Withstands indefinite output short to GND; cycles ON/OFF during continuous thermal overload - protects PCB and adjacent components without requiring external fusing. |
Applications
| Cellular Telephones | PCMCIA Cards |
|---|---|
Use Scenario: Powering baseband processor core and RF front-end ICs in GSM/CDMA handsets with single Li-ion cell input. IC Role / Device Role / Timing Role: Primary 3.3V LDO delivering regulated rail to digital baseband and transceiver modules; POK signals power-good to application processor for boot validation. Use Value: 110mV dropout enables >30 minutes additional talk time versus higher-dropout alternatives when battery voltage decays from 4.2V to 3.4V. |
Use Scenario: Providing isolated 3.3V supply for PCMCIA Type II card logic and interface circuitry in laptops and industrial terminals. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 5V host bus voltage to 3.3V; SHDN controlled by host controller to power down unused peripherals. Use Value: 1µA shutdown current minimizes parasitic drain on host system during card ejection or sleep mode - critical for hot-swap compliance. |
| Cordless Telephones | Electronic Planners |
Use Scenario: Supplying DSP, codec, and display driver in DECT 6.0 cordless handsets powered by NiMH battery packs. IC Role / Device Role / Timing Role: Main system LDO with reverse-battery protection; POK monitors output stability during high-current ring-tone generation bursts. Use Value: Reverse-battery protection prevents catastrophic failure during user-replaceable battery swaps - eliminates field returns due to polarity errors. |
Use Scenario: Regulating power for real-time clock, memory, and touch-screen controller in handheld organizers with coin-cell backup. IC Role / Device Role / Timing Role: Always-on 3.3V rail generator; GND pin thermally coupled to PCB to maintain junction temperature below +150°C during extended LCD backlight use. Use Value: 85µA quiescent current ensures >1 year coin-cell backup life when main battery is depleted - meets OEM calendar retention requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8885EUK33-T | Pin-compatible, supports higher-ESR output capacitors (up to 10Ω) but requires ≥4.7µF minimum; 120µA IQ; same 3.3V output and POK function. | Used where cost-sensitive designs mandate bulk aluminum or polymer capacitors instead of ceramics; trades 35µA higher IQ for capacitor flexibility. | Select MAX8885EUK33-T only when ceramic capacitor sourcing is constrained or ESR >0.2Ω is unavoidable in production. |
| MCP1700T-3302E/TT | 3.3V fixed LDO in SOT23-5; 1.8µA IQ; no POK output; 600mV dropout at 250mA; lacks reverse-battery and thermal shutdown protection. | Suitable for ultra-low-power sensor nodes where POK and fault protection are omitted; requires external reset IC for power monitoring. | Choose MCP1700T-3302E/TT only in non-safety-critical, energy-harvesting applications where 1µA shutdown is mandatory and fault coverage is handled elsewhere. |
Compared with MAX8875EUK33, MAX8885EUK33-T offers capacitor flexibility at higher quiescent cost, while MCP1700T-3302E/TT sacrifices protection features and POK for nanoamp IQ - neither is pin- or functionally identical, and both require layout or system-level redesign for integration.
Availability
MAX8875EUK33 is available at Aetrix Electronics and suitable for cellular telephones, PCMCIA cards, and cordless telephones requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across industrial temperature range.
Supply support for MAX8875EUK33 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 markets.
The MAX8875EUK33 belongs to Maxim's precision low-dropout regulator product line, designed specifically for battery-powered portable equipment where ultra-low quiescent current, small footprint, and robust fault protection are mandatory.
FAQ
What is the guaranteed output voltage accuracy of the MAX8875EUK33 over temperature?
The MAX8875EUK33 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 room temperature, typical accuracy is tighter - within ±0.5%. The MAX8875EUK33 achieves this via factory-trimmed internal resistor divider referencing a 1.25V bandgap, ensuring stability without external components.
Can the MAX8875EUK33 operate with a 2.5V input when regulating 3.3V output?
No, the MAX8875EUK33 cannot regulate 3.3V output from a 2.5V input. Its minimum input voltage is defined by dropout: VIN ≥ VOUT + VDROPOUT. With 3.3V output and 165mV max dropout at 150mA, the absolute minimum input is 3.465V. The datasheet specifies +2.5V to +6.5V input range only for versions with VOUT ≤2.5V (e.g., MAX8875EUK25). For the MAX8875EUK33, valid input starts at ~3.47V - confirmed by electrical characteristics tables and typical dropout curves.
Does the MAX8875EUK33 require an external pull-up resistor on the POK pin?
Yes, the MAX8875EUK33 POK pin is an open-drain N-channel MOSFET output and requires an external pull-up resistor to function as a logic-level signal. A 100kΩ resistor to OUT is recommended per the datasheet for minimal current consumption while ensuring fast rise time. Leaving POK unconnected results in undefined logic state; connecting directly to VCC violates absolute maximum ratings. The MAX8875EUK33 POK is inactive during shutdown and asserts low only when VOUT drops below 95% of 3.3V due to dropout, overload, or thermal fault.
What is the thermal resistance (θJA) of the MAX8875EUK33 in its SOT23-5 package?
The MAX8875EUK33 has a junction-to-ambient thermal resistance (θJA) of +140°C/W when mounted on a standard JEDEC 2-layer test board. This value assumes the GND pin is soldered to a minimum 1-inch² copper area acting as a heatsink. Actual θJA improves significantly with larger ground planes or internal layers - the datasheet specifies 571mW continuous power dissipation at +70°C ambient, derating 7.1mW/°C above that. Thermal performance of the MAX8875EUK33 is critically dependent on PCB layout, not package alone.
Is reverse-battery protection active on both IN and SHDN pins of the MAX8875EUK33?
Yes, reverse-battery protection in the MAX8875EUK33 actively monitors both IN and SHDN pins. If either pin falls below GND, internal circuitry disconnects parasitic paths and limits reverse current to ≤1mA - preventing damage during incorrect battery installation. This dual-pin monitoring is explicitly documented in the Applications Information section and distinguishes the MAX8875EUK33 from LDOs protecting only the input rail. The protection operates independently of enable state and does not affect normal forward-operation parameters.
MAX8875EUK33 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):
- 3.3V
- 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 FAQ
1.How can I place an order for MAX8875EUK33 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8875EUK33 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 reliable?
The price and inventory of MAX8875EUK33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8875EUK33 is usually 5 days.
3.What payment methods are accepted for MAX8875EUK33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8875EUK33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8875EUK33?
MAX8875EUK33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8875EUK33 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?
For technical support, including MAX8875EUK33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8875EUK33 requirements.
6.How does Aetrix verify that MAX8875EUK33 is sourced from the original manufacturer or authorized distributors?
All MAX8875EUK33 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 meets industry standards.
7.What is the process for return or replacement of MAX8875EUK33?
All MAX8875EUK33 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8875EUK33, 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 part is unused and in its original packaging.
Return procedure for MAX8875EUK33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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