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Analog Devices Inc./Maxim Integrated MAX8885EUK29-T
- Part No.:
- MAX8885EUK29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8885EUK29-T.pdf
- Description:
- 150 MILLIAMP, LOW-DROPOUT LINEAR
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX8885EUK29-T from Maxim Integrated is a 2.9V fixed-output, 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 voltage accuracy, and is optimized for use with 4.7µF tantalum capacitors (ESR ≥ 0.5Ω) in portable battery-powered systems.
For engineers reviewing the MAX8885EUK29-T datasheet, MAX8885EUK29-T pinout, MAX8885EUK29-T application, or MAX8885EUK29-T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SOT23-5 pin mapping, application-specific implementation guidance, and two confirmed alternative regulators with documented functional and application-level differences.
Technical Context
The MAX8885EUK29-T implements a 1.25V bandgap reference and error amplifier driving an internal P-channel MOSFET pass transistor (RDS(ON) ≈ 1.1Ω), enabling ultra-low quiescent current independent of load. Its power-OK comparator monitors VOUT against a -5.3% threshold (2.75V at 2.9V nominal) with hysteresis and disables during shutdown.
It integrates reverse-battery protection limiting reverse current to ≤1mA when VIN or SHDN falls below GND, thermal shutdown at +170°C with +20°C hysteresis, and current limiting set to 160mA (min)–600mA (max), allowing indefinite short-circuit operation without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.9V ±1% - ensures stable core logic or analog rail in space-constrained portable devices without external feedback components. |
| Max Output Current | 150mA - sufficient to power baseband processors, RF front-ends, or sensor subsystems in PCS/cellular handsets. |
| Dropout Voltage | 110mV at 100mA - enables operation down to VIN = 3.01V, extending usable battery life in single-cell Li-ion (2.75V cutoff) systems. |
| Quiescent Current | 85µA (no load) - minimizes standby drain, critical for multi-day battery life in always-on modems or palmtop computers. |
| PSRR | 60dB at 100Hz - suppresses low-frequency noise from switching DC/DC converters or noisy battery sources feeding the LDO input. |
| Shutdown Current | 1µA max - reduces system leakage during deep sleep modes, supporting low-power wake-on-event architectures. |
| Power-OK Threshold | VPOK = 2.75V (−5.3% of 2.9V) - provides reliable undervoltage detection before brownout, enabling clean microcontroller reset sequencing. |
Pinout & Package
MAX8885EUK29-T is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), with GND serving dual electrical and thermal functions-requires soldering to a large copper pad or ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input | Accepts +2.5V to +6.5V; must be bypassed with ≥1µF ceramic capacitor placed <5mm from pin to suppress high-frequency noise and ensure stability. |
| 2 GND | Ground and thermal pad | Reference node for all internal circuitry; primary heat dissipation path-requires minimum 25 mm² copper area for 571mW continuous dissipation at +70°C ambient. |
| 3 SHDN | Active-low shutdown control | Logic low (≤0.4V) disables regulator and reduces IQ to ≤1µA; connect directly to IN for always-on operation or to MCU GPIO for controlled power gating. |
| 4 POK | Open-drain power-OK indicator | Asserts low when VOUT drops ≤5.3% below nominal; requires external 100kΩ pull-up to OUT for logic-compatible signaling; inactive during shutdown. |
| 5 OUT | Regulated output | Delivers fixed 2.9V ±1%; must be bypassed with 4.7µF tantalum capacitor (ESR ≥ 0.5Ω) - ceramic capacitors cause instability and are prohibited. |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass device | Eliminates base-drive current loss, enabling constant 85µA IQ across dropout, light-load, and full-load conditions-critical for battery runtime predictability. |
| Optimized for high-ESR tantalum capacitors | Stable with 4.7µF/0.5Ω–10Ω ESR output caps-enables use of low-cost, small-footprint 3216-case tantalums instead of expensive low-ESR ceramics or larger aluminum electrolytics. |
| Reverse-battery protection | Clamps reverse current to ≤1mA if VIN or SHDN is driven below GND-prevents damage during incorrect battery insertion in consumer handhelds. |
| Thermal shutdown with hysteresis | Shuts down at +170°C and re-enables at +150°C-provides self-recovering fault protection during sustained overload without requiring system-level intervention. |
| Undervoltage POK with hysteresis | Detects output droop before system brownout and holds low until VOUT recovers by ≥0.15V-ensures robust power-on-reset timing for microcontrollers and FPGAs. |
Applications
| PCS Phones | Modems |
|---|---|
Use Scenario: Powering RF transceiver ICs and baseband processors in dual-band PCS handsets operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary 2.9V LDO supplying noise-sensitive RF sections while rejecting switching noise from buck converters powering digital cores. Use Value: 60dB PSRR at 100Hz prevents AM modulation of RF carrier by DC/DC ripple; 110mV dropout extends talk time by ~12 minutes per charge cycle vs. higher-dropout alternatives. |
Use Scenario: Providing regulated 2.9V rail to UART interface, line-driver, and DSP in embedded cellular modems used in telematics and M2M gateways. IC Role / Device Role / Timing Role: System power supervisor delivering clean voltage and POK signal to enable hardware reset coordination between host MCU and modem firmware. Use Value: POK output synchronizes modem boot sequence with host processor; 1µA shutdown current allows modem to remain in low-power listen mode for >30 days on coin-cell backup. |
| Cellular Phones | Hand-Held Instruments |
Use Scenario: Supplying 2.9V to camera module ISPs and flash LED drivers in feature phones with tight PCB area constraints. IC Role / Device Role / Timing Role: Compact, low-thermal-footprint LDO enabling integration into camera sub-PCB without heatsinks or airflow. Use Value: SOT23-5 footprint (2.9mm × 1.6mm) saves 40% board area vs. SO-8 alternatives; GND-as-heat-sink design eliminates need for thermal vias in dense layouts. |
Use Scenario: Powering precision ADCs, op-amps, and LCD bias circuits in portable multimeters and oscilloscopes requiring stable analog rails. IC Role / Device Role / Timing Role: Low-noise, high-accuracy voltage source minimizing offset drift and quantization error in measurement signal chains. Use Value: ±1% output accuracy and 170µVRMS output noise (10Hz–100kHz) limit measurement uncertainty to <0.02% FS in 16-bit ADC applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8875EUK29-T | Pin-compatible but optimized for ceramic output capacitors (1µF, ESR < 0.1Ω); higher 150µA quiescent current; no reverse-battery protection. | Required where board layout mandates ceramic caps due to MLCC availability or cost; unsuitable for reverse-polarity-prone consumer battery compartments. | Select MAX8875EUK29-T only when ceramic output caps are mandatory and reverse-battery risk is mitigated externally. |
| MIC5206-2.9YM5-TR | Pin-compatible; uses PNP pass transistor; 120µA typical IQ; 350mV dropout at 150mA; no POK output or reverse-battery protection. | Lacks power-good signaling and reverse-polarity hardening-requires external POR circuit and diode protection in battery-powered designs. | Choose MIC5206-2.9YM5-TR only for cost-sensitive, non-battery-reversal applications where POK is unnecessary and higher dropout is acceptable. |
Compared with MAX8885EUK29-T, MAX8875EUK29-T trades reverse-battery protection and lower IQ for ceramic-cap compatibility, while MIC5206-2.9YM5-TR sacrifices POK, reverse protection, and dropout performance to reduce BOM count in non-critical industrial sensors.
Availability
MAX8885EUK29-T is available at Aetrix Electronics and suitable for PCS phones, cellular handsets, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across -40°C to +85°C.
Supply support for MAX8885EUK29-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 markets.
The MAX8885 series was designed specifically for cost-sensitive, space-constrained portable electronics needing ultra-low IQ, robust battery interface protection, and stable regulation with inexpensive tantalum capacitors.
FAQ
What is the exact output voltage tolerance and temperature drift of the MAX8885EUK29-T?
The MAX8885EUK29-T guarantees ±1% initial output voltage accuracy at +25°C, with total variation across -40°C to +85°C and full load range remaining within ±2%. This is confirmed by production testing per SQC methods and reflected in the "Output Voltage Accuracy" parameter (±1% min/max) in the Electrical Characteristics table.
Can the MAX8885EUK29-T be used with ceramic output capacitors?
No-the MAX8885EUK29-T is explicitly designed for high-ESR tantalum capacitors (≥0.5Ω) and becomes unstable with low-ESR ceramic capacitors. The datasheet warns against ceramic use and directs users to the pin-compatible MAX8875 for ceramic-cap applications. Using ceramics risks oscillation and output voltage collapse.
What is the minimum input voltage required for regulation at full 150mA load for the MAX8885EUK29-T?
At 150mA load, the MAX8885EUK29-T requires VIN ≥ 3.065V (2.9V + 165mV dropout) to maintain regulation. This is derived from the "Dropout Voltage" spec: 165mV max at 150mA load, measured under defined test conditions (VIN = VOUT(NOMINAL) + 1V, TA = -40°C to +85°C).
How does the POK output behave during shutdown of the MAX8885EUK29-T?
The POK output is disabled (high-impedance) during shutdown-its function is inactive when SHDN is pulled low. This is explicitly stated in the "Detailed Description": "The POK function is not active during shutdown." Therefore, POK cannot indicate output status in shutdown mode and must be used only during active regulation.
Is reverse-battery protection active on both the IN and SHDN pins of the MAX8885EUK29-T?
Yes-reverse-battery protection activates when either VIN or SHDN falls below GND, limiting reverse current to ≤1mA. The "Detailed Description" confirms this dual-pin monitoring: "The circuitry monitors the polarity of these two pins and disconnects the internal circuitry and parasitic diodes when the battery is reversed."
MAX8885EUK29-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):
- 2.9V
- 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
MAX8885EUK29-T FAQ
1.How can I place an order for MAX8885EUK29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8885EUK29-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 MAX8885EUK29-T reliable?
The price and inventory of MAX8885EUK29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8885EUK29-T is usually 5 days.
3.What payment methods are accepted for MAX8885EUK29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8885EUK29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8885EUK29-T?
MAX8885EUK29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8885EUK29-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 MAX8885EUK29-T?
For technical support, including MAX8885EUK29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8885EUK29-T requirements.
6.How does Aetrix verify that MAX8885EUK29-T is sourced from the original manufacturer or authorized distributors?
All MAX8885EUK29-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 MAX8885EUK29-T meets industry standards.
7.What is the process for return or replacement of MAX8885EUK29-T?
All MAX8885EUK29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8885EUK29-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 MAX8885EUK29-T part is unused and in its original packaging.
Return procedure for MAX8885EUK29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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