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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 150MA LDO
- Quantity:
- Payment:
- Shipping:
Inventory:21,351
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Product details
Overview
MAX8875EUK33+ from Maxim Integrated is a 3.3V, 150mA low-dropout linear regulator with P-channel MOSFET pass device, 85µA no-load supply 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 equipment 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), shutdown current ≤1µA, reverse-battery protection, thermal shutdown at +170°C, and compatibility with 1µF ceramic output capacitors.
Technical Context
The MAX8875EUK33+ uses an internal 1.25V bandgap reference and error amplifier to regulate output via a 1.1Ω (typ) P-channel MOSFET pass transistor-eliminating base-drive current and enabling load-independent quiescent current. Its POK output activates when VOUT falls >1% below nominal due to dropout, overload, or thermal shutdown.
It integrates reverse-battery protection limiting reverse current to 1mA, thermal shutdown with 20°C hysteresis, short-circuit protection with 390mA typical current limit, and operates across –40°C to +85°C with guaranteed 150mA output current and 60dB PSRR at 100Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±1% (factory-preset, stable over –40°C to +85°C) |
| Max Output Current | 150mA continuous (guaranteed, with thermal foldback above +170°C) |
| Dropout Voltage | 110mV at 100mA load (enables operation down to VIN = 3.41V) |
| Quiescent Current | 85µA at no load (independent of output current, extends battery life) |
| PSRR | 60dB at 100Hz (suppresses low-frequency supply noise in sensitive analog rails) |
| Shutdown Current | ≤1µA max (enables ultra-low-power sleep modes in portable systems) |
| Power-OK Threshold | VOUT < 99% of nominal triggers active-low POK (supports reliable power sequencing) |
Pinout & Package
Package: 5-pin SOT23-5 (surface-mount, 2.9mm × 1.6mm × 1.1mm), GND pin serves as electrical ground and thermal heatsink-requires soldering to large copper area for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator Input | Accepts +2.5V to +6.5V; bypass with 1µF ceramic capacitor to GND for stability |
| 2 GND | Ground / Thermal Pad | Reference node and primary heat path; must connect to PCB ground plane for thermal management |
| 3 SHDN | Active-Low Shutdown Control | Logic low disables regulator and reduces IQ to ≤1µA; tie to IN for always-on operation |
| 4 POK | Open-Drain Power-OK Indicator | Active-low signal indicates VOUT out-of-regulation; requires external 100kΩ pull-up to OUT |
| 5 OUT | Regulated Output | 3.3V fixed output; bypass with 1µF ceramic capacitor (ESR <0.2Ω) for full-load stability |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current, enabling 85µA IQ independent of load-critical for battery runtime |
| Power-OK (POK) output | Provides system-level power sequencing and fault detection without external comparators or RC networks |
| Reverse-battery protection | Limits reverse current to ≤1mA if VIN or SHDN falls below GND-prevents damage during battery insertion errors |
| Thermal shutdown with hysteresis | Shuts down at +170°C and re-enables at +150°C-enables safe pulsed operation under sustained overload |
| 1µF ceramic capacitor support | Stable regulation with minimal 1µF X7R/X5R output cap-reduces BOM cost and board space vs. larger electrolytics |
Applications
| Cellular Telephones | PCMCIA Cards |
|---|---|
|
Use Scenario: Primary 3.3V rail for baseband processor and RF transceiver in GSM/CDMA handsets with single-cell Li-ion supply. IC Role / Device Role / Timing Role: Main LDO supplying core logic voltage; regulates down from 3.6V–4.2V battery range. Use Value: 110mV dropout enables >30 minutes of usable runtime below 3.4V battery voltage, extending talk time. |
Use Scenario: Local 3.3V supply for PCMCIA card controller and interface logic in laptop expansion slots. IC Role / Device Role / Timing Role: Point-of-load regulator isolating card circuitry from noisy host bus voltage. Use Value: 60dB PSRR at 100Hz suppresses host switching noise, preventing data corruption on hot-plug events. |
| Modems | Palmtop Computers |
|
Use Scenario: Standby and active-mode 3.3V supply for V.92/V.90 modem ICs in embedded DSL/cable gateways. IC Role / Device Role / Timing Role: Always-on LDO powering wake-on-ring circuitry and maintaining register state during sleep. Use Value: ≤1µA shutdown current enables multi-year battery backup for RTC and configuration memory retention. |
Use Scenario: Core voltage regulator for ARM7-based palmtop CPU and SRAM in handheld PDAs. IC Role / Device Role / Timing Role: Low-noise 3.3V source feeding digital logic and touch-screen controller ADC reference. Use Value: 170µVRMS output noise ensures <1 LSB error in 10-bit touchscreen digitization under dynamic load. |
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+ | Pin-compatible, supports higher-ESR output capacitors (e.g., tantalum); 120mV dropout at 100mA | Better suited for designs requiring legacy capacitor types or wider ESR tolerance | Select MAX8885EUK33+ when using >0.2Ω ESR output caps or needing enhanced transient robustness |
| MCP1700T-3302E/MB | 3.3V, 250mA, 1.6µA IQ, SOT23-5-but no POK output or reverse-battery protection | Lacks power-good signaling and reverse-polarity safety; requires external circuitry for sequencing | Choose MCP1700T-3302E/MB only if POK and reverse protection are unnecessary and lower IQ is prioritized |
Compared with MAX8875EUK33+, MAX8885EUK33+ offers broader capacitor compatibility at slightly higher dropout, while MCP1700T-3302E/MB trades away critical safety and monitoring features for ultra-low quiescent current-making MAX8875EUK33+ the optimal balance for battery-powered systems requiring reliability and diagnostics.
Availability
MAX8875EUK33+ is available at Aetrix Electronics and suitable for cellular telephones, PCMCIA cards, and modems requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across industrial temperature ranges.
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 demanding industrial, communications, and consumer applications.
The MAX8875 series was designed specifically for space-constrained, battery-operated portable electronics requiring ultra-low quiescent current, precise output voltage, and integrated power-monitoring functionality-targeting PCS phones, cordless handsets, and embedded modems.
FAQ
What is the maximum input voltage rating for the MAX8875EUK33+?
The MAX8875EUK33+ has an absolute maximum input voltage of +7V referenced to GND, but its specified operating input range is +2.5V to +6.5V. Exceeding +6.5V may cause functional instability or violate thermal limits, even if within absolute ratings. The device is optimized for single-cell Li-ion (3.0V–4.2V) and dual-cell alkaline (3.0V–3.2V) supplies, where it delivers full 150mA output with minimal dropout.
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 generate a valid logic-high level. A 100kΩ resistor connected from POK to OUT is recommended per the datasheet; this minimizes current draw while ensuring fast rise time. Leaving POK unconnected disables the power-good function, and connecting it directly to VCC or IN violates the absolute maximum rating for POK-to-GND voltage.
Can the MAX8875EUK33+ operate with a 10µF output capacitor instead of the recommended 1µF?
Yes, the MAX8875EUK33+ remains stable with a 10µF ceramic output capacitor and benefits from improved PSRR, lower output noise, and faster load-transient response. The 1µF minimum is specified for guaranteed stability across –40°C to +85°C with X7R/X5R dielectrics; larger values are acceptable and commonly used to enhance performance in noise-sensitive applications like audio codec supplies or ADC references.
What is the thermal shutdown behavior of the MAX8875EUK33+ under continuous overload?
The MAX8875EUK33+ enters thermal shutdown at +170°C junction temperature and remains off until the die cools by 20°C (to +150°C), at which point it automatically resumes regulation. This hysteresis prevents oscillation and enables safe pulsed operation during sustained overload-such as a shorted output-without permanent damage. Continuous operation above +150°C is not recommended; proper PCB copper area on the GND pin is required to maintain TJ < +150°C at full load.
Is reverse-battery protection active during shutdown mode of the MAX8875EUK33+?
Yes, reverse-battery protection remains fully active in shutdown mode of the MAX8875EUK33+. The protection circuit monitors polarity on both IN and SHDN pins independently and disconnects internal circuitry and parasitic paths when either falls below GND-limiting reverse current to ≤1mA regardless of SHDN state. This ensures safety during battery replacement or field maintenance even when the device is disabled.
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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