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Analog Devices Inc./Maxim Integrated MAX38903AATB+
- Part No.:
- MAX38903AATB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX38903AATB+.pdf
- Description:
- IC REG LIN POS PROG 1A 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:297
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Product details
Overview
MAX38903AATB+ from Analog Devices is a 1A, low-noise linear regulator in a 10-pin TDFN package with pin-selectable output voltages (1.2V–5.0V), 5.5μVRMS output noise (10Hz–100kHz), ±1% DC output accuracy over load/line/temperature, and only 100mV dropout at full load. It delivers stable power to noise-sensitive analog circuits in high-resolution data acquisition systems.
For engineers reviewing the MAX38903AATB+ datasheet, MAX38903AATB+ pinout, MAX38903AATB+ application, or MAX38903AATB+ equivalent, key selection criteria include its nine factory-configurable output options, active discharge (800Ω), programmable soft-start via BYP capacitor, thermal/overcurrent protection, and compatibility with minimal 4μF output capacitance.
Technical Context
The MAX38903AATB+ uses a precision bandgap reference and error amplifier architecture with internal voltage select logic decoding SELA/SELB states at startup to set one of nine fixed output voltages. Its low-noise design relies on a dedicated BYP pin filtering the reference and feedback path, enabling 5.5μVRMS noise performance.
It integrates reverse-current protection triggered when VIN falls 10mV below VOUT, thermal shutdown at 165°C (with 15°C hysteresis), and current limiting at 1.4A (typ). The 1200μA quiescent current remains constant across dropout voltage and load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 1A continuous - supports high-current analog rails without external pass devices. |
| Output Noise | 5.5μVRMS (10Hz–100kHz) - enables clean power for ADCs, DACs, and RF signal chains. |
| DC Accuracy | ±1% over load, line, and temperature - ensures consistent voltage regulation across operating conditions. |
| Dropout Voltage | 100mV max at 1A - allows operation with minimal input–output headroom (e.g., 2.6V IN → 2.5V OUT). |
| Input Voltage Range | 1.7V to 5.5V - compatible with single-cell Li-ion, USB, and intermediate supply rails. |
| Soft-Start Control | Programmable via 0.001–0.1μF BYP-to-OUT capacitor - prevents inrush current and enables controlled power-up sequencing. |
| Active Discharge | 800Ω resistor from OUT to GND when EN = low - discharges output caps rapidly for safe power-down. |
| Protection Features | Thermal shutdown (165°C), overcurrent limit (1.4A typ), reverse-current blocking - eliminates need for external protection circuitry. |
Pinout & Package
MAX38903AATB+ is housed in a 10-pin, 3mm × 3mm TDFN package with exposed pad (EP) for thermal dissipation. Pin 1 is OUT (top-left corner, pad-side down); EP must be soldered to a ground plane with thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | IN | Regulator input supply (1.7V–5.5V); requires 10μF ceramic bypass to GND. |
| 3 | GND | Ground reference for IN/OUT bypass caps; critical for noise and stability performance. |
| 4 | EN | Active-high enable; pulling low disables output and activates 800Ω active discharge. |
| 5 | SELA | Voltage select input A - sampled at startup to configure one of nine output voltages (GND/IN/floating). |
| 6 | SELB | Voltage select input B - paired with SELA to define output voltage per Table 1 in datasheet. |
| 7 | OUTS | Output sense node - connects remotely to load for Kelvin sensing and improved regulation accuracy. |
| 8 | BYP | Bypass capacitor node - sets soft-start slew rate and reduces reference noise (0.001–0.1μF to OUT). |
| 9, 10 | OUT | Main regulated output (1.2V–5.0V); sources up to 1A; requires ≥4μF low-ESR ceramic cap to GND. |
| EP | Exposed Pad | Thermal and electrical ground - must be connected to PCB ground plane with multiple thermal vias. |
Key Features
| Feature | Design Value |
|---|---|
| Precision pin-selectable outputs | Nine discrete voltages (1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.1V, 3.3V, 4.0V, 5.0V) configured by SELA/SELB logic states at startup - eliminates external resistors and saves board space. |
| Ultra-low output noise | 5.5μVRMS (10Hz–100kHz) achieved via dedicated BYP-filtered reference path - directly improves SNR in high-resolution ADC/DAC applications. |
| Stable with minimal output capacitance | Guaranteed stability with only 4μF (min) ceramic output capacitor - reduces bill-of-materials and footprint vs. traditional LDOs requiring ≥10μF. |
| Programmable soft-start | Slew rate adjustable from 0.5V/ms to 50V/ms using 0.001–0.1μF BYP capacitor - prevents input rail sag and downstream reset glitches. |
| Integrated reverse-current protection | Blocks reverse current when VOUT > VIN by disabling pMOS pass device at 10mV differential - avoids output capacitor discharge into input during power-down. |
| Robust fault protection | Combines 1.4A current limit, thermal shutdown (165°C), and automatic recovery hysteresis (150°C) - sustains operation under intermittent overload without latch-off. |
Applications
| High-Resolution Data Acquisition | High-End Audio Systems |
|---|---|
|
Use Scenario: Powering 24-bit SAR ADCs and precision instrumentation amplifiers in portable test equipment. IC Role / Device Role / Timing Role: Low-noise, high-accuracy voltage source for analog front-end rails (AVDD, REFIN, VCM). Use Value: 5.5μVRMS noise and ±1% accuracy preserve effective number of bits (ENOB) and minimize gain/offset drift across temperature. |
Use Scenario: Supplying DAC output stages and headphone amplifiers in battery-powered audiophile DACs. IC Role / Device Role / Timing Role: Clean, regulated analog supply decoupled from noisy digital domains. Use Value: Ultra-low noise prevents audible hiss; 100mV dropout enables efficient use of single-cell Li-ion (3.0–4.2V) to generate 2.5V/3.3V rails. |
| Medical Sensor Signal Conditioning | Communication System Power Management |
|
Use Scenario: Biasing low-power EEG/ECG front-end ASICs in wearable biosensors. IC Role / Device Role / Timing Role: Primary analog supply with fast active discharge for safe power cycling between measurement bursts. Use Value: 800Ω active discharge clears output caps in <1ms, enabling rapid wake/sleep transitions and reducing system standby current. |
Use Scenario: Regulating local 1.8V/2.5V supplies for RF transceivers and baseband processors in small-cell radios. IC Role / Device Role / Timing Role: Point-of-load regulator with POK-compatible timing (via external pull-up) for sequenced power-up. Use Value: While MAX38903AATB+ lacks POK, its precise ±1% accuracy and 70dB PSRR at 10kHz suppress switching noise from adjacent DC/DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX38903BATB+ | Resistor-programmable output (0.6V–5.0V) instead of pin-selectable; adds active-high POK output. | Required where dynamic voltage scaling or power-good signaling is needed (e.g., FPGA core rail sequencing). | Select MAX38903BATB+ if output voltage flexibility or POK assertion is mandatory; MAX38903AATB+ is preferred for fixed-voltage, cost-optimized designs. |
| TPL7407LDR | 7-channel 200mA NMOS LDO array; 12μVRMS noise; no active discharge or OUTS sense pin. | Targeted at multi-rail digital I/O buffering, not high-precision analog supplies. | Choose TPL7407LDR only for low-current, multi-output digital biasing; MAX38903AATB+ delivers superior noise, accuracy, and single-rail 1A capability. |
Compared with MAX38903BATB+, MAX38903AATB+ trades programmability and POK for simpler layout and lower BOM count in fixed-voltage systems; versus TPL7407LDR, it provides 2.7× lower noise, 5× higher current, and analog-grade accuracy-making it unsuitable for digital-only applications but essential for precision analog power.
Availability
MAX38903AATB+ is available at Aetrix Electronics and suitable for high-resolution data acquisition systems, medical sensor modules, and high-end audio equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX38903AATB+ 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX38903 family was designed specifically for noise-critical analog power delivery in portable and space-constrained systems, emphasizing ultra-low noise, high accuracy, and robust protection in miniature packages.
FAQ
What output voltages does the MAX38903AATB+ support?
The MAX38903AATB+ supports nine factory-configured output voltages: 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.1V, 3.3V, 4.0V, and 5.0V. These are selected at power-on by the logic states (GND, IN, or floating) applied to SELA and SELB pins, as defined in Table 1 of the MAX38903AATB+ datasheet. No external resistors are required.
Does the MAX38903AATB+ include power-good (POK) functionality?
No, the MAX38903AATB+ does not include a power-good (POK) output. That feature is exclusive to the MAX38903B variant (e.g., MAX38903BATB+). The MAX38903AATB+ provides enable (EN), output sense (OUTS), and active discharge but omits POK to simplify pinout and reduce cost for fixed-voltage applications.
What is the minimum output capacitance required for stability with the MAX38903AATB+?
The MAX38903AATB+ is stable with a minimum 4μF ceramic output capacitor (including voltage and temperature derating). This value is significantly lower than many competing LDOs, reducing solution size and cost. X5R or X7R dielectrics are recommended to maintain capacitance across operating conditions.
How does the active discharge feature work on the MAX38903AATB+?
When the EN pin is pulled low, the MAX38903AATB+ connects an internal 800Ω resistor between the OUT pin and GND. This actively discharges the output capacitor, reducing discharge time compared to passive RC decay. It simplifies power sequencing in systems requiring rapid, controlled power-down of analog rails.
Can the MAX38903AATB+ be used with input voltages below 2.0V?
Yes, the MAX38903AATB+ operates with input voltages as low as 1.7V, supporting applications powered by single-cell Li-ion (2.7–4.2V), NiMH, or low-voltage DC/DC outputs. At 1.7V input, dropout remains within specification for outputs ≤1.6V (e.g., 1.5V or 1.2V configurations), enabling efficient operation near battery end-of-life.
MAX38903AATB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Programmable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.3V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 2 mA
- Current - Supply (Max):
- -
- PSRR:
- 70dB ~ 40dB (1kHz ~ 1MHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x3)
MAX38903AATB+ FAQ
1.How can I place an order for MAX38903AATB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX38903AATB+ 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 MAX38903AATB+ reliable?
The price and inventory of MAX38903AATB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX38903AATB+ is usually 5 days.
3.What payment methods are accepted for MAX38903AATB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX38903AATB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX38903AATB+?
MAX38903AATB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX38903AATB+ 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 MAX38903AATB+?
For technical support, including MAX38903AATB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX38903AATB+ requirements.
6.How does Aetrix verify that MAX38903AATB+ is sourced from the original manufacturer or authorized distributors?
All MAX38903AATB+ 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 MAX38903AATB+ meets industry standards.
7.What is the process for return or replacement of MAX38903AATB+?
All MAX38903AATB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX38903AATB+, 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 MAX38903AATB+ part is unused and in its original packaging.
Return procedure for MAX38903AATB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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