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Analog Devices Inc./Maxim Integrated MAX1831EEE+
- Part No.:
- MAX1831EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1831EEE+.pdf
- Description:
- IC REG BUCK ADJ 3A 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,706
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Product details
Overview
MAX1831EEE+ from Maxim Integrated is a 3A, 1MHz synchronous step-down DC-DC regulator with internal PMOS/NMOS switches, designed for 5V/3.3V-to-low-voltage conversion in notebook and subnotebook computers. It delivers preset +3.3V, +2.5V, or +1.5V outputs (pin-selectable), operates from +3V to +5.5V input, achieves up to 94% efficiency, and features constant-off-time PWM control with Idle Mode™ for light-load optimization.
For engineers reviewing the MAX1831EEE+ datasheet, MAX1831EEE+ pinout, MAX1831EEE+ application, or MAX1831EEE+ equivalent, key selection considerations include its 16-pin QSOP package, internal 45mΩ/55mΩ power switches, ±1.5% output accuracy, 100% duty-cycle low-dropout operation, and programmable switching frequency up to 1MHz - all critical for compact, high-efficiency CPU I/O and chipset supply designs.
Technical Context
The MAX1831EEE+ implements a current-mode, constant-off-time PWM architecture that dynamically adjusts on-time while holding off-time fixed via external RTOFF, enabling stable regulation across line and load transients. Its proprietary Idle Mode™ skips pulses below 0.14–1.0A load thresholds, reducing gate-charge and transition losses without compromising regulation.
It integrates a 45mΩ PMOS high-side switch and 55mΩ NMOS synchronous rectifier, eliminating external Schottky diodes. The device supports 100% duty-cycle operation for low-dropout conditions, uses internal digital soft-start (256-cycle ramp), and includes thermal shutdown (165°C) and output short-circuit protection - all within a single 16-pin QSOP package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Continuous 3A - supports full-power CPU I/O and chipset rails without external current boosting. |
| Input Voltage Range | +3.0V to +5.5V - compatible with standard 3.3V and 5V system rails in portable computing. |
| Preset Output Voltages | +3.3V, +2.5V, +1.5V (pin-selectable via FBSEL) - eliminates external feedback resistors for common logic supply levels. |
| Switching Frequency | Up to 1MHz - enables use of small 1.5µH inductors and ceramic output capacitors for space-constrained PCBs. |
| Efficiency | Up to 94% - achieved via synchronous rectification and low RDS(on) internal switches, minimizing conduction loss. |
| Output Accuracy | ±1.5% - ensures tight regulation for sensitive core/logic supplies without post-regulation trimming. |
| Shutdown Current | <1µA - preserves battery life during system sleep states in portable applications. |
Pinout & Package
MAX1831EEE+ is housed in a 16-pin QSOP (Quarter-Size Outline Package) with exposed pad for thermal enhancement. Pin pitch is 0.025", body dimensions are 4.9mm × 3.9mm × 1.5mm, and the package is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX (Pins 1, 3, 14, 16) | Power Switch Node | Drain connection of internal PMOS and NMOS switches; connects directly to inductor and output filter capacitor. |
| IN (Pins 2, 4) | Main Power Input | Supplies the internal PMOS switch; requires local 22µF ceramic input capacitor within 5mm. |
| SHDN (Pin 5) | Logic-Controlled Enable | Active-low shutdown input; pulls supply current below 1µA and places LX in high-impedance state. |
| COMP (Pin 6) | Loop Compensation | Integrator node for transconductance amplifier; requires 470pF capacitor to VCC for stable loop response. |
| TOFF (Pin 7) | Off-Time Programming | Resistor-to-ground sets constant off-time (0.4–5.0µs), determining switching frequency up to 1MHz. |
| FB (Pin 8) | Voltage Feedback Input | Senses output voltage directly (fixed mode) or via resistive divider (adjustable mode); bias current <360nA. |
| GND (Pin 9) | Analog Ground Reference | Reference for internal analog circuitry; must be separated from PGND in high-current layouts. |
| REF (Pin 10) | Internal Reference Output | 1.100V ±1.1% reference; bypassed with 1µF capacitor to GND for noise immunity. |
| FBSEL (Pin 11) | Output Voltage Selection | Three-state logic input (GND/VCC/REF/unconnected) selects +3.3V/+2.5V/+1.5V or adjustable mode. |
| VCC (Pin 12) | Analog Supply Input | Powers internal analog blocks; bypassed with 10Ω + 2.2µF RC filter to suppress supply noise. |
| PGND (Pins 13, 15) | Power Ground Return | Source connection of internal NMOS switch; must tie to high-current ground plane near LX and IN. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Switches | 45mΩ PMOS + 55mΩ NMOS at VIN = +4.5V - eliminates external Schottky diode, reduces BOM count and conduction loss. |
| Idle Mode™ Operation | Automatic pulse-skipping below 0.14–1.0A load - maintains >85% efficiency at 10mA load without external control. |
| Digital Soft-Start | 256-cycle internal ramp - limits inrush current during startup, preventing input rail collapse and capacitor stress. |
| 100% Duty-Cycle Mode | PMOS remains fully on when VIN ≈ VOUT - supports ultra-low dropout (e.g., 3.3V input → 3.3V output) with only 150mV typical dropout at 3A. |
| Thermal Protection | 165°C junction shutdown with 15°C hysteresis - prevents destructive failure under sustained overload or poor heatsinking. |
Applications
| CPU I/O Power Supply | Chipset Core Supply |
|---|---|
Use Scenario: Providing regulated +2.5V or +1.5V to microprocessor I/O buffers in subnotebook platforms with 3.3V main rail. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering continuous 3A with fast transient response to I/O switching currents. Use Value: Eliminates need for external Schottky diode and reduces solution size by 30% vs. asynchronous alternatives while maintaining ±1.5% output accuracy. | Use Scenario: Generating +3.3V or +2.5V for northbridge/southbridge logic in dual-rail notebook motherboards. IC Role / Device Role / Timing Role: Fixed-output DC-DC regulator with pin-selectable voltage, synchronized to system clock domain for noise control. Use Value: Achieves 94% peak efficiency at full load, reducing thermal load on chipset area and enabling fanless design in thin form factors. |
| Notebook System Rail | Low-Power Embedded Controller Supply |
Use Scenario: Converting 5V adapter input to +1.5V for DDR memory termination or display interface logic in clamshell notebooks. IC Role / Device Role / Timing Role: Adjustable-output buck regulator (via FBSEL = GND + resistor divider) supporting multiple memory voltage standards. Use Value: Programmable off-time (via RTOFF) allows optimization of EMI profile and inductor size without changing IC - critical for FCC/CE compliance. | Use Scenario: Powering ARM-based microcontrollers or PMIC sequencers in always-on subsystems requiring <1µA shutdown current. IC Role / Device Role / Timing Role: Highly integrated step-down regulator with integrated soft-start and thermal protection for unattended operation. Use Value: Internal digital soft-start and <1µA shutdown current extend battery runtime in standby modes beyond 30 days in typical implementations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1742EEE+ | 1A continuous output, 500kHz max frequency, same 16-pin QSOP package but lower current capability and no Idle Mode™. | Suitable for low-power peripherals or auxiliary rails where 3A is unnecessary; lacks light-load efficiency optimization. | Select MAX1742EEE+ only if load current remains ≤1A and board space constraints match the identical footprint. |
| TPS54331DR | 3A output, 570kHz fixed frequency, external MOSFET drivers, no integrated NMOS sync rectifier - requires external Schottky diode or second FET. | Higher BOM count and layout complexity; better thermal dissipation via external FETs but lower peak efficiency (≤90%). | Choose TPS54331DR when thermal management demands discrete FETs or when existing designs already use TI's WEBENCH ecosystem. |
Compared with MAX1742EEE+ and TPS54331DR, the MAX1831EEE+ uniquely combines 3A capability, integrated synchronous switches, Idle Mode™ for sub-100mA efficiency, and pin-selectable outputs - making it optimal for space- and efficiency-critical notebook CPU I/O and chipset rails where component count and light-load battery life are primary constraints.
Availability
MAX1831EEE+ is available at Aetrix Electronics and suitable for notebook computer power delivery, CPU I/O supply design, and chipset voltage regulation requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX1831EEE+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for computing, communications, and industrial markets.
The MAX1830/MAX1831 product line was designed specifically for high-efficiency, low-voltage DC-DC conversion in portable computing systems - emphasizing integration, light-load performance, and compact footprint for space-constrained mobile platforms.
FAQ
What output voltages does the MAX1831EEE+ support, and how are they selected?
The MAX1831EEE+ supports preset +3.3V, +2.5V, and +1.5V outputs, selected by connecting the FBSEL pin to REF, VCC, or floating/unconnected, respectively. For adjustable output (from +1.1V to VIN), connect FBSEL to GND and use a resistive divider from VOUT to GND at the FB pin. The MAX1831EEE+ does not support +1.8V - that option is exclusive to the MAX1830EEE+ variant.
Does the MAX1831EEE+ require an external Schottky diode?
No, the MAX1831EEE+ does not require an external Schottky diode. It integrates both a 45mΩ PMOS high-side switch and a 55mΩ NMOS synchronous rectifier, enabling full synchronous rectification. This eliminates conduction losses associated with external diodes and reduces total solution size and component count.
What is the maximum achievable switching frequency of the MAX1831EEE+, and how is it set?
The MAX1831EEE+ supports switching frequencies up to 1MHz, set by the resistor RTOFF connected from the TOFF pin to GND. Off-time ranges from 0.4µs to 5.0µs, and frequency is determined by input/output voltage and RTOFF value per the formula fPWM = (VIN − VOUT − VPMOS) / [tOFF × (VIN − VPMOS + VNMOS)]. Recommended RTOFF values range from 36kΩ to 430kΩ.
How does the MAX1831EEE+ handle thermal overload conditions?
The MAX1831EEE+ includes thermal shutdown protection triggered at 165°C junction temperature, with 15°C hysteresis. When activated, the device disables all internal switches and enters a safe high-impedance state until junction temperature falls below 150°C. This prevents permanent damage during sustained overload, poor PCB copper layout, or inadequate airflow - a critical safeguard in sealed notebook enclosures.
What is the purpose of the COMP pin on the MAX1831EEE+, and what component is required?
The COMP pin on the MAX1831EEE+ serves as the compensation node for the internal transconductance error amplifier. A 470pF capacitor must be connected from COMP to VCC to stabilize the control loop and ensure phase margin >45° across operating conditions. Using a larger capacitor slows transient response but improves DC accuracy; a smaller value risks instability and output oscillation.
MAX1831EEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.1V (1.5V, 2.5V, 3.3V)
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX1831EEE+ FAQ
1.How can I place an order for MAX1831EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1831EEE+ 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 MAX1831EEE+ reliable?
The price and inventory of MAX1831EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1831EEE+ is usually 5 days.
3.What payment methods are accepted for MAX1831EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1831EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1831EEE+?
MAX1831EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1831EEE+ 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 MAX1831EEE+?
For technical support, including MAX1831EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1831EEE+ requirements.
6.How does Aetrix verify that MAX1831EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1831EEE+ 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 MAX1831EEE+ meets industry standards.
7.What is the process for return or replacement of MAX1831EEE+?
All MAX1831EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1831EEE+, 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 MAX1831EEE+ part is unused and in its original packaging.
Return procedure for MAX1831EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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