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Analog Devices Inc./Maxim Integrated MAX8840ELT19+T
- Part No.:
- MAX8840ELT19+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8840ELT19+T.pdf
- Description:
- IC REG LINEAR 1.9V 150MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,910
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Product details
Overview
MAX8840ELT19+T from Maxim Integrated is a 1.9V fixed-output, ultra-low-noise, high-PSRR, low-dropout linear regulator delivering up to 150mA with 120mV dropout at 120mA load, 11µVRMS output noise (100Hz–100kHz), and 78dB PSRR at 1kHz - designed for powering noise-sensitive analog circuitry in portable RF systems.
For engineers reviewing the MAX8840ELT19+T datasheet, MAX8840ELT19+T pinout, MAX8840ELT19+T application, or MAX8840ELT19+T equivalent, key selection criteria include its µDFN-6 (1.5mm × 1.0mm) package, BP-pin-enabled noise suppression, 40µA ground current, shutdown current <1µA, and guaranteed stability with 1µF ceramic output capacitance.
Technical Context
The MAX8840ELT19+T employs a p-channel MOSFET pass transistor (typ. RDS(ON) = 1Ω) to achieve low dropout and minimal quiescent current - eliminating base-drive losses inherent in PNP-based LDOs. Its bandgap reference (1.225V) feeds an error amplifier that controls the pass gate via internal feedback.
Noise reduction is implemented through a dedicated BP pin connected to a 10nF capacitor to OUT, enabling ultra-low 11µVRMS output noise by shunting high-frequency noise from the reference path. Shutdown logic disables the reference, error amp, and gate driver, reducing supply current to <0.05µA at +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.9V ±3% over -40°C to +85°C - ensures stable biasing for 1.8V/1.9V logic and RF front-end ICs without external resistors. |
| Max Output Current | 150mA guaranteed - supports moderate-power analog blocks like VCOs, ADC drivers, or low-noise amplifiers in compact handheld devices. |
| Dropout Voltage | 120mV at 120mA load - enables operation down to VIN = 2.0V, extending usable battery life in single-cell Li-ion or Li-poly systems. |
| Output Noise | 11µVRMS (100Hz–100kHz) with 10nF BP capacitor - meets stringent phase-noise requirements for local oscillators and PLL power rails. |
| PSRR | 78dB at 1kHz, 54dB at 100kHz - suppresses switching noise from DC-DC converters feeding the same system rail. |
| Ground Current | 40µA typical at light load - minimizes standby power loss in always-on sensor or Bluetooth subsystems. |
| Shutdown Current | <0.05µA at +85°C - enables deep-sleep modes in battery-powered IoT endpoints without measurable leakage impact. |
Pinout & Package
MAX8840ELT19+T is housed in a lead-free, RoHS-compliant 6-pin µDFN package measuring 1.5mm × 1.0mm × 0.8mm, with exposed thermal pad (GND-connected) for enhanced power dissipation in space-constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Unregulated input supply | Accepts 2V to 6V input; requires 1µF ceramic bypass capacitor close to pin for line-transient immunity. |
| 2 GND | Ground reference and thermal path | Electrical return and primary heat sink - must be connected to large PCB copper area or ground plane. |
| 3 SHDN | Active-low shutdown control | Pulled low disables regulator output (high-Z); logic-high ≥1.5V enables operation; draws <0.1µA bias current. |
| 4 BP | Noise bypass terminal | Connects 10nF capacitor to OUT to reduce reference noise - shorted to OUT during shutdown to prevent leakage paths. |
| 5 N.C. | No connection | Not internally bonded; left floating or tied to GND per layout best practice - no electrical function. |
| 6 OUT | Regulated 1.9V output | Delivers up to 150mA; stable with ≥1µF X7R/X5R ceramic capacitor; voltage accuracy ±3% across full load/temperature range. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 11µVRMS (100Hz–100kHz) enabled by BP pin and 10nF capacitor - directly reduces phase jitter in RF synthesizers. |
| High PSRR at audio frequencies | 78dB rejection at 1kHz - isolates sensitive analog stages from digital supply ripple without additional LC filtering. |
| Low dropout with p-MOSFET | 120mV dropout at 120mA using 1Ω RDS(ON) pass device - avoids efficiency loss and thermal stress seen in bipolar LDOs. |
| Minimal external components | Only requires IN and OUT 1µF ceramics plus 10nF BP capacitor - eliminates need for ESR-tuned tantalum or electrolytic caps. |
| Robust protection suite | Integrated current limit (150–300mA), thermal shutdown (160°C trip, 10°C hysteresis), and infinite short-circuit tolerance - enables unattended operation in field-deployed hardware. |
Applications
| Cellular Front-End Power | Bluetooth Audio DAC Supply |
|---|---|
Use Scenario: Powers low-noise amplifier (LNA) and mixer in 4G/5G handset RF transceiver modules. IC Role / Device Role / Timing Role: Ultra-low-noise 1.9V bias rail for RF signal chain - replaces noisier switching regulators or higher-dropout LDOs. Use Value: 11µVRMS noise and 78dB PSRR prevent reciprocal mixing and maintain EVM <2.5% under co-site interference. | Use Scenario: Supplies stereo DAC and headphone amplifier in Bluetooth earbuds with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary analog supply rail decoupled from noisy digital core - enables >110dB SNR audio playback. Use Value: 120mV dropout extends usable battery voltage down to 2.0V, adding ~18 minutes of playback time versus 200mV-dropout alternatives. |
| Digital Camera Image Sensor Bias | Portable Medical Pulse Oximeter |
Use Scenario: Provides clean 1.9V reference voltage for CMOS image sensor analog front-end and column ADC. IC Role / Device Role / Timing Role: Low-noise analog supply for pixel readout circuitry - critical for dark-current stability and dynamic range. Use Value: 11µVRMS noise prevents fixed-pattern noise (FPN) increase and preserves 12-bit effective resolution at ISO 800. | Use Scenario: Powers photodiode transimpedance amplifier (TIA) and analog signal conditioner in battery-operated pulse oximeters. IC Role / Device Role / Timing Role: Precision analog rail for sub-µV-level optical signal amplification - immune to motor or display switching noise. Use Value: 40µA ground current and <1µA shutdown draw enable 7-day continuous monitoring on CR2032 coin cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A2019PDBVR | 1.9V fixed, 300mA, 14µVRMS noise, 65dB PSRR @ 100kHz, SOT-23-5 package (2.9mm × 1.6mm) | Larger footprint; higher noise; lower PSRR - suitable where board area is less constrained than noise budget. | Select when needing higher output current headroom or compatibility with legacy SOT-23 layouts. |
| MCP1700-1902E/TO | 1.9V fixed, 250mA, 30µVRMS noise, 60dB PSRR @ 100kHz, SOT-23-3 package (no enable/shutdown) | No SHDN pin; no BP pin; higher noise - acceptable for non-critical analog rails with relaxed SNR targets. | Select for cost-sensitive designs where shutdown control and ultra-low noise are not required. |
Compared with TPS7A2019PDBVR and MCP1700-1902E/TO, the MAX8840ELT19+T delivers the lowest output noise and highest PSRR in the smallest footprint - making it optimal for miniaturized RF and precision analog systems where noise-induced performance degradation is unacceptable.
Availability
MAX8840ELT19+T is available at Aetrix Electronics and suitable for cellular front-end power, Bluetooth audio DAC supply, digital camera image sensor bias, and portable medical pulse oximeter applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX8840ELT19+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 markets.
The MAX8840 series belongs to Maxim's ultra-low-noise LDO product line, engineered specifically for powering noise-sensitive RF and precision analog circuits in battery-constrained portable devices - prioritizing PSRR, output noise, and dropout voltage over raw current capability.
FAQ
What is the output voltage tolerance of the MAX8840ELT19+T over temperature and load?
The MAX8840ELT19+T guarantees ±3% output voltage accuracy across the full operating range of -40°C to +85°C and for load currents from 100µA to 80mA. At room temperature and 1mA load, initial accuracy is tighter at ±1%. This specification ensures reliable operation of 1.9V I/O interfaces and analog circuitry without external trimming.
Can the MAX8840ELT19+T operate with input voltages below 2V?
No - the MAX8840ELT19+T has a minimum input voltage rating of 2V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2V risks improper regulation or undefined behavior. For sub-2V inputs, consider alternative LDOs with lower VIN min specifications, but note that the MAX8840ELT19+T is not characterized or guaranteed below 2V.
Is a bypass capacitor required on the BP pin of the MAX8840ELT19+T?
Yes - the BP pin is essential to achieving the specified 11µVRMS output noise. A 10nF ceramic capacitor must be placed between BP and OUT. Omitting this capacitor degrades noise performance to 230µVRMS, per the datasheet's Electrical Characteristics table. The capacitor must be low-leakage (<10nA) and placed adjacent to the IC.
Does the MAX8840ELT19+T require an external feedback resistor network?
No - the MAX8840ELT19+T is a factory-preset, fixed-output regulator delivering 1.9V. It does not use the FB pin (which is reserved for the adjustable MAX8842 variant). The MAX8840ELT19+T connects its internal feedback divider directly to the output, eliminating external resistors and associated tolerance errors.
What thermal derating applies to the MAX8840ELT19+T in its µDFN package?
The MAX8840ELT19+T has a θJA of 477°C/W and a maximum continuous power dissipation of 0.168W at +70°C ambient, derating by 2.1mW/°C above that temperature. To sustain full 150mA output at high ambient temperatures, the PCB must provide robust thermal conduction - especially via the exposed GND pad - to avoid junction temperatures exceeding +150°C.
MAX8840ELT19+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- -
- PSRR:
- 78dB ~ 54dB (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)
MAX8840ELT19+T FAQ
1.How can I place an order for MAX8840ELT19+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8840ELT19+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 MAX8840ELT19+T reliable?
The price and inventory of MAX8840ELT19+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8840ELT19+T is usually 5 days.
3.What payment methods are accepted for MAX8840ELT19+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8840ELT19+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8840ELT19+T?
MAX8840ELT19+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8840ELT19+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 MAX8840ELT19+T?
For technical support, including MAX8840ELT19+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8840ELT19+T requirements.
6.How does Aetrix verify that MAX8840ELT19+T is sourced from the original manufacturer or authorized distributors?
All MAX8840ELT19+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 MAX8840ELT19+T meets industry standards.
7.What is the process for return or replacement of MAX8840ELT19+T?
All MAX8840ELT19+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8840ELT19+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 MAX8840ELT19+T part is unused and in its original packaging.
Return procedure for MAX8840ELT19+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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