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Analog Devices Inc./Maxim Integrated MAX1983EUT
- Part No.:
- MAX1983EUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1983EUT.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:2,218
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Product details
Overview
MAX1983EUT from Maxim Integrated is an adjustable-output, low-dropout linear regulator with external 5V bias supply, delivering 0.8V–2.0V at up to 300mA from a 1.25V–5.5V input. It features ±3% output voltage accuracy over –40°C to +85°C, 175mV dropout at 150mA, and integrated thermal shutdown and current limiting. It serves as a precision VID supply in portable computing power rails.
For engineers reviewing the MAX1983EUT datasheet, MAX1983EUT pinout, MAX1983EUT application, or MAX1983EUT equivalent, key selection criteria include its adjustable output range (0.8V–2.0V), external BIAS-driven N-channel pass transistor architecture, 1ms PGOOD propagation delay (via MAX1982 reference compatibility), SOT23-6 package constraints, and thermal/current protection behavior under load transients.
Technical Context
The MAX1983EUT uses an external 4.5V–5.5V BIAS supply to drive the gate of an internal N-channel pass transistor, decoupling control circuitry power from the main input (IN). This enables regulation from ultra-low VIN (as low as 1.25V) while maintaining high efficiency and low dropout.
Its ADJ pin accepts a resistor divider between OUT and GND to set output voltage within 0.8V–2.0V; the internal 0.8V reference and error amplifier enforce regulation. Shutdown is controlled via SHDN, reducing total supply current to ≤5µA, and thermal shutdown activates at +160°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.8V to 2.0V - Adjustable via external resistor divider on ADJ pin; supports dynamic VID scaling in CPU core supplies. |
| Output Accuracy | ±3% over –40°C to +85°C - Ensures stable core voltage under temperature and load variation for reliable microprocessor operation. |
| Dropout Voltage | 175mV at 150mA - Enables usable operation down to VIN = VOUT + 0.175V, extending battery life in low-voltage portable systems. |
| Input Voltage Range (IN) | 1.25V to 5.5V - Supports direct connection to partially discharged Li-ion cells or intermediate DC-DC outputs. |
| BIAS Supply Voltage | 4.5V to 5.5V - Requires dedicated 5V rail (e.g., system standby or USB VBUS); not derived from IN. |
| Quiescent BIAS Current | 250µA max - Minimizes loading on the 5V bias rail during active regulation, critical for shared-system power budgets. |
| Shutdown Current | 5µA max total (IN + BIAS) - Enables deep-sleep mode in handheld devices without compromising wake-up latency. |
| RMS Output Noise | 65µVRMS (10Hz–100kHz) - Low enough for noise-sensitive analog or RF subsystems powered from same rail. |
Pinout & Package
MAX1983EUT is housed in a 6-pin SOT23-6 package (top mark ABEB or ABEB+), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and exposed pad for thermal relief (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BIAS | Bias supply input | Powers internal control circuitry and gate driver; must be 4.5V–5.5V; bypass with ≥0.1µF ceramic capacitor near pin. |
| 2 - GND | Analog/digital ground reference | Common return for IN, OUT, BIAS, and ADJ; requires low-impedance connection to PCB ground plane. |
| 3 - SHDN | Active-low shutdown control | Drives low to disable regulator; pulls high to BIAS for normal operation; draws ≤±1µA. |
| 4 - ADJ | Feedback input for output voltage setting | Connects to resistor divider midpoint between OUT and GND; senses 0.8V reference to regulate VOUT = 0.8V × (1 + R1/R2). |
| 5 - OUT | Regulated output terminal | Delivers up to 300mA; requires ≥10µF low-ESR ceramic capacitor (ESR ≤35mΩ) to ground for stability and transient response. |
| 6 - IN | Main power input to pass transistor drain | Accepts 1.25V–5.5V input; bypass with ≥10µF ceramic capacitor; carries full load current and must use wide copper traces. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output (0.8V–2.0V) | Enables single-part support across multiple core voltage requirements (e.g., 1.0V, 1.2V, 1.5V) without redesigning feedback network. |
| External 5V BIAS drive | Decouples gate drive from low VIN, enabling <1.3V input operation while maintaining fast transient response and low dropout. |
| No minimum load requirement | Permits zero-load operation in standby states without instability or regulation loss-critical for always-on subsystems. |
| Integrated thermal shutdown | Protects against sustained overload by disabling pass transistor above +160°C; resumes after 20°C cooldown, preventing latch-up. |
| Low 250µA BIAS quiescent current | Reduces parasitic draw on shared 5V bias rail, preserving margin for other peripherals in compact portable designs. |
| 10µs PGOOD fault response | Ensures rapid system-level fault detection when output drops >120mV (10% of 1.2V nominal), supporting safe processor reset sequencing. |
Applications
| Mobile Processor Core Supply | Notebook System Standby Rail |
|---|---|
|
Use Scenario: Delivering dynamically scaled core voltage (e.g., 0.9V–1.3V) to ARM or x86 application processors during DVFS transitions. IC Role / Device Role / Timing Role: Adjustable LDO regulating CPU VDDCORE; ADJ pin driven by DAC or GPIO-controlled resistor network for real-time voltage tuning. Use Value: Enables precise, low-noise core voltage control with <175mV dropout-extending usable battery voltage range by ~200mV versus standard LDOs. |
Use Scenario: Providing clean, low-quiescent 1.8V or 2.0V supply to chipset I/O, RTC, or memory retention circuits during S3/S4 sleep states. IC Role / Device Role / Timing Role: Always-on LDO with SHDN-controlled enable; maintains regulation during deep sleep with ≤5µA total shutdown current. Use Value: Reduces system-wide standby power by eliminating need for higher-IQ regulators or discrete biasing networks. |
| Portable Media Player Audio Codec Bias | Industrial Handheld Data Acquisition Front-End |
|
Use Scenario: Powering low-noise audio DAC/ADC analog sections requiring 1.2V ±3% with minimal PSRR-coupled ripple. IC Role / Device Role / Timing Role: Low-noise LDO supplying analog VDDA; leverages 65µVRMS noise and –60dB PSRR @1kHz to suppress digital switching noise. Use Value: Achieves >95dB SNR in audio path without additional ferrite-bead filtering, saving board space and BOM cost. |
Use Scenario: Regulating sensor interface voltage (e.g., 1.0V for MEMS accelerometer bias) in battery-powered field instruments operating from 2.4V–4.2V Li-ion. IC Role / Device Role / Timing Role: Input-flexible LDO accepting variable battery voltage; uses IN pin directly from cell, BIAS from auxiliary 5V DC-DC. Use Value: Eliminates need for pre-regulation stage-reducing component count and conversion losses in compact, energy-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS7A1633DGNR | Fixed 3.3V output; no ADJ pin; 200mA max; 1.7V–5.5V IN; no external BIAS requirement | Suitable only for fixed-voltage rails; lacks VID flexibility and ultra-low-VIN capability | Select when output voltage is static and system lacks dedicated 5V bias rail. |
| Analog Devices ADM7172ACPZ-R7 | Fixed or adjustable (via resistor) output; 200mA; 2.3V–6.5V IN; no external BIAS; 75µV RMS noise | Higher minimum input (2.3V) prevents use below 2.3V; lower noise but no BIAS-driven dropout advantage | Select when lowest possible noise is prioritized and input stays >2.3V; avoid if VIN may dip below 1.8V. |
Compared with MAX1983EUT, TPS7A1633DGNR eliminates BIAS dependency but sacrifices adjustability and sub-1.3V operation, while ADM7172ACPZ-R7 offers superior noise performance yet cannot match the MAX1983EUT's 1.25V input capability or 175mV dropout at 150mA-making MAX1983EUT uniquely suited for ultra-low-input, VID-programmable applications.
Availability
MAX1983EUT is available at Aetrix Electronics and suitable for notebook computers, portable media players, industrial handhelds, and battery-powered data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1983EUT 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 computing, communications, and industrial markets.
The MAX1982/MAX1983 family was designed specifically for low-voltage, high-efficiency power regulation in portable computing-leveraging external bias to overcome traditional N-channel LDO input limitations while maintaining tight accuracy and robust fault protection.
FAQ
What is the minimum input voltage required for MAX1983EUT to regulate a 0.8V output?
The MAX1983EUT requires VIN ≥ VOUT + 0.175V (dropout) under 150mA load, so for 0.8V output, minimum VIN is 0.975V. However, datasheet specifies absolute minimum VIN = 1.25V across all conditions-including startup, line regulation, and thermal margin-so 1.25V is the guaranteed operational floor for MAX1983EUT regardless of load or temperature.
Can MAX1983EUT be used without the external 5V BIAS supply?
No. The MAX1983EUT requires a 4.5V–5.5V BIAS supply on Pin 1 to power its internal control circuitry and drive the N-channel pass transistor gate. Operation without BIAS is undefined and will result in no regulation or potential damage; the device does not derive bias internally from IN or OUT.
How do I calculate the resistor values for the ADJ feedback network on MAX1983EUT?
Use VOUT = 0.8V × (1 + R1/R2). Set R2 = 40kΩ (recommended per datasheet), then solve R1 = R2 × (VOUT/0.8V − 1). For example, for 1.2V output: R1 = 40kΩ × (1.2/0.8 − 1) = 20kΩ. Ensure both resistors are 1% tolerance metal film for ±3% overall accuracy in MAX1983EUT output.
Does MAX1983EUT include power-good monitoring like MAX1982EUT?
No. MAX1983EUT omits the PGOOD pin (Pin 4 is ADJ, not PGOOD). Only MAX1982EUT provides open-drain PGOOD with 1ms rise time. MAX1983EUT relies on external supervision or system-level monitoring; no internal voltage-valid flag is generated or exported.
What is the maximum continuous output current for MAX1983EUT at 1.2V output and 2.5V input?
At VIN = 2.5V and VOUT = 1.2V, the input-output differential is 1.3V. Per the Short-Circuit Current Limit vs. Input Voltage graph (toc09), MAX1983EUT delivers ~600mA typical short-circuit current at this ΔV. However, continuous current is thermally limited: at TA = +70°C, max power dissipation is 696mW, so IOUT ≤ 696mW / 1.3V ≈ 535mA-but derating and layout-dependent thermal resistance reduce practical continuous current to ≤300mA as specified.
MAX1983EUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.35V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 250 µA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (10kHz)
- Control Features:
- Enable, Power Good
- Protection Features:
- Over Current, Over Temperature, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX1983EUT FAQ
1.How can I place an order for MAX1983EUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1983EUT 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 MAX1983EUT reliable?
The price and inventory of MAX1983EUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1983EUT is usually 5 days.
3.What payment methods are accepted for MAX1983EUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1983EUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1983EUT?
MAX1983EUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1983EUT 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 MAX1983EUT?
For technical support, including MAX1983EUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1983EUT requirements.
6.How does Aetrix verify that MAX1983EUT is sourced from the original manufacturer or authorized distributors?
All MAX1983EUT 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 MAX1983EUT meets industry standards.
7.What is the process for return or replacement of MAX1983EUT?
All MAX1983EUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX1983EUT, 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 MAX1983EUT part is unused and in its original packaging.
Return procedure for MAX1983EUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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