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Analog Devices Inc./Maxim Integrated MAX8842ELT+T
- Part No.:
- MAX8842ELT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8842ELT+T.pdf
- Description:
- IC REG LIN POS ADJ 150MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:24,816
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Product details
Overview
MAX8842ELT+T from Maxim Integrated is an adjustable-output, ultra-low-noise, low-dropout linear regulator delivering up to 150mA output current with 120mV dropout at 120mA load, 40µA ground current, and 230µVRMS output noise (100Hz–100kHz). It uses a p-channel MOSFET pass transistor and supports external feedback for precise voltage setting in battery-powered portable electronics.
For engineers reviewing the MAX8842ELT+T datasheet, MAX8842ELT+T pinout, MAX8842ELT+T application, or MAX8842ELT+T equivalent, key selection criteria include its adjustable output via FB pin, µDFN-6 package footprint, thermal/overcurrent protection, and compatibility with 1µF ceramic input/output capacitors without requiring bypass capacitor.
Technical Context
The MAX8842ELT+T implements a bandgap reference (1.225V), error amplifier, and p-channel MOSFET pass transistor (typ. 1Ω RDS(ON)) to regulate output voltage via external resistor divider on the FB pin. Its shutdown logic disables reference, error amp, and gate drive when SHDN is pulled low, reducing supply current to <1µA.
Unlike the MAX8840 (BP pin for noise reduction) and MAX8841 (no BP, no FB), the MAX8842ELT+T replaces BP with FB and omits internal voltage-divider feedback - enabling user-defined output using R1/R2 per VOUT = 1.225V × (1 + R1/R2), with R2 ≤ 240kΩ and 1% resistors recommended.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 150mA continuous delivery; supports peak loads without foldback. |
| Dropout Voltage | 120mV at 120mA load - enables operation down to VIN = VOUT + 0.12V, extending battery runtime. |
| Ground Current | 40µA typical at light load - minimizes quiescent power loss in always-on subsystems. |
| Output Noise | 230µVRMS (100Hz–100kHz) - suitable for noise-sensitive analog/RF circuitry without BP capacitor. |
| PSRR | 72dB at 1kHz, 46dB at 100kHz - suppresses switching noise from upstream DC/DC converters. |
| Input Voltage Range | 2V to 6V - compatible with single-cell Li-ion (2.7–4.2V), dual-cell alkaline (2–3.2V), and 3.3V/5V rails. |
| Shutdown Current | <1µA - enables deep-sleep modes in portable devices with zero-load leakage. |
Pinout & Package
MAX8842ELT+T is housed in a 1.5mm × 1.0mm × 0.8mm 6-pin µDFN package with exposed pad for thermal dissipation. Pin 1 (IN) is marked by a dot; GND (Pin 2) serves dual electrical and thermal functions and must be connected to a large copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Unregulated Input Supply | Accepts 2V–6V input; requires 1µF ceramic capacitor to GND for stability and line-transient suppression. |
| 2 GND | Ground Reference & Thermal Path | Primary return path and heat sink; must be soldered to ≥25mm² copper pour for thermal reliability. |
| 3 SHDN | Active-Low Shutdown Control | Pull ≤0.4V to disable regulator; high-impedance state at OUT; logic-high threshold ≥1.5V. |
| 4 FB | Adjustable Feedback Input | Connects to resistor divider (R1/R2); sets VOUT = 1.225V × (1 + R1/R2); bias current ≤0.01µA. |
| 5 N.C. | No Internal Connection | Not bonded; must remain unconnected - floating or tied to GND/IN violates layout guidelines. |
| 6 OUT | Regulated Output Voltage | Delivers user-defined VOUT; bypassed with 1µF ceramic capacitor to GND for stability across all loads. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output via FB Pin | Enables precise VOUT from 1.5V to 4.5V using external resistors - eliminates inventory of fixed-voltage variants. |
| p-Channel MOSFET Pass Transistor | 1Ω typ. RDS(ON) delivers low dropout and eliminates base-drive current - improves efficiency vs. PNP-based LDOs. |
| Stable with 1µF Ceramic Capacitors | Eliminates need for tantalum or aluminum electrolytics - reduces BOM cost, size, and aging-related failure risk. |
| Thermal & Overcurrent Protection | Shuts down at 160°C junction temperature with 10°C hysteresis; limits output to 150–300mA to prevent damage during shorts. |
| Ultra-Low Quiescent Current | 40µA ground current at light load - extends battery life in standby and sensor-monitoring applications. |
Applications
| Wireless Audio Headset Power | Digital Camera Sensor Bias |
|---|---|
|
Use Scenario: Powers CMOS image sensor and audio codec in compact Bluetooth camera headset with single Li-ion cell. IC Role / Device Role / Timing Role: Adjustable LDO providing clean 2.8V bias to sensor and 1.8V to codec via resistor reconfiguration. Use Value: 230µVRMS noise prevents visible banding in low-light images; 120mV dropout extends usable battery range to 2.92V. |
Use Scenario: Supplies low-noise bias to high-resolution CMOS image sensor in DSLR-style digital camera. IC Role / Device Role / Timing Role: Regulates sensor analog core voltage (e.g., 2.5V) while rejecting ripple from shared 3.3V system rail. Use Value: 72dB PSRR at 1kHz attenuates DC/DC converter switching noise; 1µF ceramic stability simplifies PCB layout near sensor. |
| Portable Medical Pulse Oximeter | Industrial Handheld Scanner |
|
Use Scenario: Powers photodiode amplifier and ADC in battery-operated pulse oximeter requiring stable analog supply. IC Role / Device Role / Timing Role: Delivers ultra-low-noise 3.0V rail to analog front-end; shutdown controlled by microcontroller during idle periods. Use Value: 40µA ground current preserves battery for >100 hours of intermittent use; thermal protection prevents overheating in sealed enclosure. |
Use Scenario: Provides regulated 3.3V to laser driver and decode ASIC in rugged handheld barcode scanner. IC Role / Device Role / Timing Role: Maintains regulation during motor-induced line transients; FB pin allows field calibration of output voltage. Use Value: Excellent load transient response (<10mV deviation) ensures consistent laser power; µDFN-6 footprint saves space in compact housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B252MR-G | Fixed 2.5V output only; no FB pin; 150mA, 200mV dropout, 45µA IQ. | Not adjustable - requires redesign if voltage change needed; lacks shutdown control. | Select only when fixed 2.5V suffices and board space permits larger SOT-25 package. |
| Analog Devices ADP125ARHZ-R7 | Adjustable (0.8V–5.0V), 500mA, 135mV dropout, 30µA IQ, but 400µVRMS noise. | Higher noise degrades SNR in precision analog circuits; wider input range (2.3V–5.5V). | Prefer when higher current or lower IQ is critical, and noise sensitivity is moderate. |
Compared with the MAX8842ELT+T, the XC6210B252MR-G lacks adjustability and shutdown, limiting flexibility in multi-rail systems, while the ADP125ARHZ-R7 trades 170µVRMS higher noise for greater current headroom - making MAX8842ELT+T optimal for noise-critical, space-constrained portable designs.
Availability
MAX8842ELT+T is available at Aetrix Electronics and suitable for wireless audio headsets, digital camera sensors, portable medical monitors, and industrial handheld scanners requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8842ELT+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 MAX8840/MAX8841/MAX8842 family was designed specifically for ultra-low-noise, low-quiescent-current regulation in space-constrained portable electronics - emphasizing ceramic-capacitor compatibility, thermal robustness, and minimal PCB footprint.
FAQ
What output voltage range does the MAX8842ELT+T support?
The MAX8842ELT+T supports user-adjustable output voltages from 1.5V to 4.5V using an external resistor divider on the FB pin. The formula is VOUT = 1.225V × (1 + R1/R2), with R2 recommended ≤240kΩ and 1% tolerance resistors for accuracy. Factory-tested performance data covers this full range.
Does the MAX8842ELT+T require a bypass capacitor like the MAX8840?
No - the MAX8842ELT+T does not have a BP (bypass) pin and does not require a bypass capacitor. Unlike the MAX8840, it uses the FB pin for adjustment and achieves 230µVRMS output noise without BP. The 1µF output capacitor remains mandatory for stability across all load conditions.
How is thermal protection implemented in the MAX8842ELT+T?
The MAX8842ELT+T incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +160°C. After shutdown, the device re-enables once temperature drops by 10°C, resulting in pulsed output under sustained overload. This protects against permanent damage during fault conditions without requiring external circuitry.
Can the MAX8842ELT+T be used with input voltages below 2V?
No - the absolute minimum input voltage for the MAX8842ELT+T is 2V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2V risks improper regulation, increased dropout, or functional failure; the device is not characterized or guaranteed for sub-2V operation.
What is the maximum allowable output capacitance for the MAX8842ELT+T?
The MAX8842ELT+T is stable with output capacitances from 1µF up to at least 10µF, provided the capacitor's ESR remains within the stable region shown in Figure toc20 of the datasheet. X7R/X5R ceramics up to 10µF are confirmed compatible; larger values may improve transient response but require verification of phase margin in target application.
MAX8842ELT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 4.5V
- Voltage Dropout (Max):
- -
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- -
- PSRR:
- 72dB ~ 46dB (1kHz ~ 100kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX8842ELT+T FAQ
1.How can I place an order for MAX8842ELT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8842ELT+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 MAX8842ELT+T reliable?
The price and inventory of MAX8842ELT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8842ELT+T is usually 5 days.
3.What payment methods are accepted for MAX8842ELT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8842ELT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8842ELT+T?
MAX8842ELT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8842ELT+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 MAX8842ELT+T?
For technical support, including MAX8842ELT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8842ELT+T requirements.
6.How does Aetrix verify that MAX8842ELT+T is sourced from the original manufacturer or authorized distributors?
All MAX8842ELT+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 MAX8842ELT+T meets industry standards.
7.What is the process for return or replacement of MAX8842ELT+T?
All MAX8842ELT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8842ELT+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 MAX8842ELT+T part is unused and in its original packaging.
Return procedure for MAX8842ELT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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