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Analog Devices Inc./Maxim Integrated MAX8885EUK33-T
- Part No.:
- MAX8885EUK33-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8885EUK33-T.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MAX8885EUK33-T from Maxim Integrated is a 3.3V, 150mA low-dropout linear regulator with P-channel MOSFET pass element, 85µA no-load supply current, 110mV dropout at 100mA, and active-low open-drain Power-OK (POK) output. It operates from +2.5V to +6.5V input and is optimized for portable battery-powered systems using low-cost tantalum capacitors - e.g., PCS phones and palmtop computers.
For engineers reviewing the MAX8885EUK33-T datasheet, MAX8885EUK33-T pinout, MAX8885EUK33-T application, or MAX8885EUK33-T equivalent, key selection criteria include guaranteed 150mA output under dropout conditions, ±1% output voltage accuracy over temperature, reverse-battery protection, thermal shutdown with 20°C hysteresis, and compatibility with ≥0.5Ω ESR, 4.7µF tantalum output capacitors.
Technical Context
The MAX8885EUK33-T employs an internal 1.25V bandgap reference and error amplifier driving a 1.1Ω typical P-channel MOSFET pass transistor, enabling ultra-low quiescent current independent of load. Its feedback network is fully internal, setting fixed 3.3V output with ±1% accuracy across –40°C to +85°C.
Power-OK functionality uses an open-drain comparator monitoring VOUT against a –5.3% threshold (2.98V at 3.3V nominal), asserting low during dropout, thermal shutdown, or current limit. Shutdown logic reduces supply current to ≤1µA, and reverse-battery protection limits reverse current to 1mA when VIN or SHDN falls below GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% over –40°C to +85°C - ensures stable core/logic rail without external resistors. |
| Max Output Current | 150mA guaranteed - supports moderate-power RF modules or baseband ICs in handheld devices. |
| Dropout Voltage | 110mV at 100mA (165mV at 150mA) - enables operation down to ~3.41V input while maintaining 3.3V output. |
| Quiescent Current | 85µA at no load - extends battery life in always-on standby modes of cellular handsets. |
| PSRR | 60dB at 100Hz - suppresses low-frequency noise from switching power supplies or battery ripple. |
| POK Threshold | VOUT falling below 2.98V (–5.3% of 3.3V) triggers active-low POK - provides reliable undervoltage detection for system reset sequencing. |
| Shutdown Current | ≤1µA max - meets ultra-low-power requirements for deep-sleep states in portable instrumentation. |
Pinout & Package
Package: 5-pin SOT23-5 (JEDEC MO-178AA), 2.9mm × 1.6mm footprint, GND pin serves as thermal path - requires soldering to PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input | Accepts +2.5V to +6.5V; bypass with ≥1µF capacitor placed <5mm from pin to ensure stability. |
| 2 GND | Ground / thermal pad | Reference node and primary heat dissipation path; must connect to large copper area for >571mW continuous dissipation. |
| 3 SHDN | Active-low enable | Pull low to disable regulator; connect to IN for always-on operation; input threshold VIH = 2.0V min, VIL = 0.4V max. |
| 4 POK | Open-drain Power-OK | Asserts low when VOUT drops ≤2.98V; requires external 100kΩ pull-up to OUT for logic-level signaling. |
| 5 OUT | Regulated 3.3V output | Sources up to 150mA; requires 4.7µF tantalum capacitor (ESR ≥0.5Ω) for stability - ceramic caps not supported. |
Key Features
| Feature | Design Value |
|---|---|
| Optimized for high-ESR tantalum capacitors | Stable with 4.7µF/≥0.5Ω ESR output cap - eliminates need for expensive low-ESR ceramics in cost-sensitive designs. |
| Reverse-battery protection | Limits reverse current to ≤1mA if VIN or SHDN goes below GND - prevents damage during battery insertion errors. |
| Thermal shutdown with hysteresis | Shuts down at +170°C junction temp; restarts after cooling by 20°C - enables safe pulsed operation under overload. |
| Undervoltage POK with hysteresis | POK asserts low at VOUT ≤2.98V and releases at ≥3.04V - avoids chatter during marginal input conditions. |
| P-channel MOSFET pass element | Eliminates base-drive current loss - maintains 85µA IQ across full load range including dropout. |
Applications
| PCS Phones | Palmtop Computers |
|---|---|
Use Scenario: Primary 3.3V supply for baseband processor and RF transceiver in dual-mode PCS handsets. IC Role / Device Role / Timing Role: LDO regulator providing clean, stable 3.3V rail with fast transient response to burst-mode transmission loads. Use Value: 110mV dropout enables extended talk time from single-cell Li-ion (3.4V cutoff), while POK signals host µC before brownout. |
Use Scenario: Core voltage regulator for ARM-based palmtop CPU and SRAM interface logic. IC Role / Device Role / Timing Role: Fixed-output LDO delivering regulated 3.3V with ±1% accuracy across –40°C to +85°C operating range. Use Value: 85µA quiescent current minimizes standby drain; reverse-battery protection safeguards against field-replaceable battery misinsertion. |
| PCMCIA Cards | Electronic Planners |
Use Scenario: 3.3V power source for PCMCIA Type II card peripherals (e.g., modem, memory expansion). IC Role / Device Role / Timing Role: Input-voltage-flexible LDO accepting host-supplied 3.3V–5.0V inputs and regulating to precise 3.3V output. Use Value: Pin-compatible replacement for MIC5206; supports hot-plug operation with robust short-circuit and thermal protection. |
Use Scenario: Main supply for LCD controller and real-time clock in battery-backed electronic organizers. IC Role / Device Role / Timing Role: Low-noise (170µVRMS), high-PSRR regulator powering analog and digital sections from shared battery rail. Use Value: 60dB PSRR at 100Hz rejects noise from display backlight drivers; POK output synchronizes RTC reset on power failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8875EUK33-T | Pin-compatible, but optimized for ceramic output capacitors (requires 1µF ceramic, ESR <0.1Ω); higher 150µA IQ. | Used where board space constraints favor small ceramic caps or where lower ESR improves transient response. | Select MAX8875EUK33-T only if ceramic output caps are mandatory; MAX8885EUK33-T remains preferred for cost-sensitive tantalum-based designs. |
| MIC5206-3.3YM5-TR | Pin-compatible, 150mA LDO with 120mV dropout at 100mA; no POK output; 80µA IQ; supports ceramic or tantalum caps. | Lacks power-good signaling - unsuitable for systems requiring brownout detection or sequenced power-down. | Choose MIC5206-3.3YM5-TR only when POK is unnecessary and lowest possible IQ is critical; MAX8885EUK33-T adds fault visibility at minimal cost premium. |
Compared with MAX8875EUK33-T and MIC5206-3.3YM5-TR, the MAX8885EUK33-T uniquely combines POK functionality, reverse-battery protection, and guaranteed stability with low-cost tantalum capacitors - making it the optimal choice for cost-constrained, battery-powered portable equipment requiring robust power supervision.
Availability
MAX8885EUK33-T is available at Aetrix Electronics and suitable for PCS phones, palmtop computers, PCMCIA cards, and electronic planners requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for MAX8885EUK33-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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX8885 series was designed specifically for cost-sensitive, battery-powered portable electronics requiring ultra-low IQ, robust protection features, and compatibility with inexpensive high-ESR tantalum capacitors - targeting PCS/cellular handsets and handheld instruments.
FAQ
What is the output voltage tolerance and temperature range for MAX8885EUK33-T?
The MAX8885EUK33-T delivers a fixed 3.3V output with ±1% accuracy over the full operating temperature range of –40°C to +85°C. This specification is production-tested and guaranteed via Statistical Quality Control (SQC) correlation across temperature, ensuring consistent performance in portable equipment exposed to ambient thermal cycling.
Does MAX8885EUK33-T support ceramic output capacitors?
No, the MAX8885EUK33-T is explicitly optimized for high-ESR tantalum capacitors (≥0.5Ω, 4.7µF) and becomes unstable with low-ESR ceramic capacitors. For ceramic-capacitor compatibility, Maxim specifies the pin-compatible MAX8875EUK33-T - which uses different internal compensation and requires ≤0.1Ω ESR.
How does the Power-OK (POK) output function on MAX8885EUK33-T?
The POK pin on MAX8885EUK33-T is an open-drain N-channel MOSFET that pulls low when VOUT falls to ≤2.98V (–5.3% of nominal), indicating dropout, thermal shutdown, or current limit. It requires an external 100kΩ pull-up resistor to OUT and remains inactive during shutdown mode - enabling reliable system-level power monitoring and reset generation.
What thermal protection features does MAX8885EUK33-T include?
The MAX8885EUK33-T incorporates thermal shutdown that activates at +170°C junction temperature and includes 20°C hysteresis - restarting regulation only after cooling to +150°C. This allows safe, pulsed operation under sustained overload while preventing permanent damage, and its GND pin is thermally enhanced to dissipate up to 571mW at +70°C ambient.
Can MAX8885EUK33-T operate with input voltages below 2.5V?
No - the absolute minimum input voltage for MAX8885EUK33-T is +2.5V, and operation below this violates Absolute Maximum Ratings. At 3.3V output, the minimum functional input is determined by dropout: for 150mA load, VIN must be ≥3.465V (3.3V + 165mV). Input voltages below 2.5V risk undefined behavior or damage.
MAX8885EUK33-T 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 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
MAX8885EUK33-T FAQ
1.How can I place an order for MAX8885EUK33-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8885EUK33-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 MAX8885EUK33-T reliable?
The price and inventory of MAX8885EUK33-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8885EUK33-T is usually 5 days.
3.What payment methods are accepted for MAX8885EUK33-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8885EUK33-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8885EUK33-T?
MAX8885EUK33-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8885EUK33-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 MAX8885EUK33-T?
For technical support, including MAX8885EUK33-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8885EUK33-T requirements.
6.How does Aetrix verify that MAX8885EUK33-T is sourced from the original manufacturer or authorized distributors?
All MAX8885EUK33-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 MAX8885EUK33-T meets industry standards.
7.What is the process for return or replacement of MAX8885EUK33-T?
All MAX8885EUK33-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8885EUK33-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 MAX8885EUK33-T part is unused and in its original packaging.
Return procedure for MAX8885EUK33-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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