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Analog Devices Inc./Maxim Integrated MAX15462AATA+T
- Part No.:
- MAX15462AATA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFDFN
- Datasheet:
-
MAX15462AATA+T.pdf
- Description:
- IC REG BUCK 3.3V 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,966
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Product details
Overview
MAX15462AATA+T from Analog Devices is a high-efficiency, synchronous step-down DC-DC converter with integrated pMOS/nMOS power switches, delivering up to 300mA at a fixed 3.3V output across a 4.5V–42V input range. It features peak-current-mode control, selectable PFM/PWM operation via MODE pin, internal soft-start (4.1ms), and open-drain RESET for output voltage monitoring. It targets industrial point-of-load regulation in space-constrained sensors and 4–20mA loop transmitters.
For engineers reviewing the MAX15462AATA+T datasheet, MAX15462AATA+T pinout, MAX15462AATA+T application, or MAX15462AATA+T equivalent, key selection criteria include its -40°C to +125°C operating range, 92% peak efficiency, 2.2µA shutdown current, 500kHz switching frequency, and TDFN-8 (2mm × 2mm) package-critical for high-voltage, low-quiescent-power industrial power rails.
Technical Context
The MAX15462AATA+T implements a peak-current-mode control architecture with internal slope compensation and a latched MODE pin that determines PFM (light-load pulse-skipping) or forced-PWM (fixed 500kHz) operation at power-up. Its integrated high-side pMOS (1.75Ω typ @ +25°C) and low-side nMOS (0.55Ω typ @ +25°C) enable synchronous rectification without external diodes.
It incorporates an internal 5V LDO (VCC) with 150mV dropout, programmable EN/UVLO (1.215V rising threshold), monotonic startup into prebiased outputs, hiccup-mode overcurrent protection (0.56A peak limit), and thermal shutdown at 166°C. The FB/VOUT pin is internally connected to a precision 0.9V reference for 3.3V regulation (±1.5% over temperature).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 42V - supports wide industrial input rails including 24V and 36V systems without external pre-regulation. |
| Output Voltage | Fixed 3.3V ±1.5% - internally trimmed; no external feedback resistors required for nominal operation. |
| Max Output Current | 300mA continuous - sufficient for powering microcontrollers, ADCs, and analog front-ends in sensor nodes. |
| Switching Frequency | 465kHz to 535kHz - fixed-frequency PWM mode enables predictable EMI filtering; PFM mode skips cycles below ~55mA load. |
| Peak Efficiency | 92% at 3.3V/300mA (VIN=24V) - achieved via synchronous MOSFETs and low RDS(on), reducing heat dissipation in compact layouts. |
| Shutdown Current | 2.2µA typical - enables ultra-low-power standby in battery-backed or energy-harvesting systems. |
| Operating Temperature | -40°C to +125°C ambient - qualified for harsh industrial environments including HVAC and process control enclosures. |
Pinout & Package
MAX15462AATA+T is housed in an 8-pin, 2mm × 2mm TDFN package with exposed pad (θJA = 162°C/W). Pin 1 is VIN; pin 8 is LX. All pins are surface-mount compatible with standard reflow profiles (260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Primary input rail connection; requires local 1µF X7R ceramic bypass to GND for stability and EMI suppression. |
| EN/UVLO (Pin 2) | Enable / Input UVLO Input | Active-high logic input; rising threshold 1.215V allows precise input-voltage turn-on programming via resistor divider from VIN. |
| VCC (Pin 3) | Internal LDO Output | 5V regulated supply for internal circuitry; must be bypassed with ≥1µF ceramic capacitor to GND for noise immunity. |
| FB/VOUT (Pin 4) | Feedback / Output Sense | Internally tied to 0.9V reference for 3.3V output; direct connection to VOUT enables fixed-output operation without external resistors. |
| MODE (Pin 5) | Control Mode Selection | Ground for forced-PWM (constant frequency); floating for automatic PFM at light loads - latched at power-up only. |
| RESET (Pin 6) | Open-Drain Reset Output | Asserts low when VOUT falls below 92% of regulation; releases high-impedance 2ms after VOUT rises above 95%. |
| GND (Pin 7) | Power Ground | Primary return path; must connect to low-impedance ground plane and tie all system grounds at single point. |
| LX (Pin 8) | Switch Node | Connection to inductor switch node; high-impedance during shutdown; carries high dv/dt - requires tight layout and guard ring. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET Integration | Eliminates external Schottky diode and reduces conduction losses - enables >92% efficiency at full load with minimal BOM count. |
| Programmable EN/UVLO Threshold | 1.215V rising threshold with ±25mV tolerance - allows precise input-voltage sequencing and brown-out protection without external comparators. |
| Monotonic Soft-Start | 4.1ms internal ramp time - prevents output overshoot and inrush current when powering prebiased rails or capacitive loads. |
| Hiccup-Mode Overcurrent Protection | 0.56A peak current limit with 131ms timeout - protects against sustained short-circuit while enabling automatic recovery without latch-off. |
| Prebiased Output Startup | Supports safe startup into existing VOUT voltage - essential for multi-rail systems where 3.3V may already be present before MAX15462AATA+T enables. |
Applications
| Industrial Sensor Power Supply | 4–20mA Loop Transmitter |
|---|---|
|
Use Scenario: Powers analog signal conditioning circuitry (op-amps, RTD interfaces, ADCs) inside IP67-rated temperature/pressure sensors deployed in factory floors. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator converting 24V loop supply; delivers stable rail despite input ripple and load transients. Use Value: 92% efficiency minimizes self-heating in sealed enclosures; -40°C to +125°C rating ensures reliability across ambient extremes. |
Use Scenario: Supplies 3.3V to microcontroller and DAC in two-wire 4–20mA current-loop transmitters interfacing with PLCs. IC Role / Device Role / Timing Role: High-voltage input buck regulator providing isolated 3.3V rail from shared 24V loop power; RESET monitors output integrity. Use Value: 2.2µA shutdown current extends battery life in loop-powered backup modes; PFM mode maintains >85% efficiency at µA-level sleep currents. |
| HVAC Zone Controller | High-Voltage LDO Replacement |
|
Use Scenario: Powers MCU, wireless SoC, and environmental sensors in distributed HVAC zone controllers powered from 36V building supply rails. IC Role / Device Role / Timing Role: Efficient 3.3V conversion stage replacing linear regulators; MODE pin set to PWM for EMI-controlled fan motor drive timing. Use Value: 42V max input eliminates need for upstream buck pre-regulator; TDFN-8 footprint saves PCB area vs. TO-252 LDO solutions. |
Use Scenario: Replaces inefficient 78L33 or LM2936 LDOs in legacy industrial modules where input voltage exceeds 12V. IC Role / Device Role / Timing Role: Synchronous buck converter delivering 3.3V at 300mA with <100mV dropout - replaces linear regulator with 3× lower thermal load. Use Value: Reduces board temperature rise by >25°C at full load; eliminates heatsink requirement in confined chassis designs. |
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 |
|---|---|---|---|
| LMR36503RNXR | 3.3V fixed, 500mA, 3V–65V input, 1.2MHz switching, 12-pin WSON (3mm × 2mm) | Higher output current and input voltage range; larger package; no RESET or MODE pin | Select when >300mA load or >42V input is required; not drop-in due to pinout and feature differences. |
| TPS563201DDCR | 3.3V fixed, 3A, 4.5V–18V input, 580kHz, SOT-23-6 | Higher current but narrower input range; no RESET, no EN/UVLO programming, no PFM mode | Choose for cost-sensitive 12V-rail applications needing >300mA; unsuitable for 24V+/industrial UVLO requirements. |
Compared with LMR36503RNXR and TPS563201DDCR, the MAX15462AATA+T uniquely combines 42V input capability, integrated RESET, programmable EN/UVLO, and PFM/PWM mode selection in a 2mm × 2mm footprint-making it optimal for space-constrained, high-reliability 3.3V industrial point-of-load designs.
Availability
MAX15462AATA+T is available at Aetrix Electronics and suitable for industrial sensors, 4–20mA loop transmitters, and HVAC zone controllers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX15462AATA+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX15462 series was designed specifically for high-voltage, low-quiescent-power industrial point-of-load regulation-emphasizing robustness, small size, and ease of use in harsh environments with wide input ranges and precise output monitoring.
FAQ
What is the output voltage tolerance of the MAX15462AATA+T over temperature and line?
The MAX15462AATA+T delivers a fixed 3.3V output with ±1.5% regulation tolerance over the full -40°C to +125°C ambient temperature range and 4.5V–42V input voltage range. This is achieved via an internal 0.9V reference with low drift and precision feedback routing, ensuring stable MCU and sensor rail performance without external trimming.
Does the MAX15462AATA+T support startup into a prebiased output?
Yes, the MAX15462AATA+T supports monotonic startup into a prebiased output in both PFM and forced-PWM modes. Its internal soft-start circuit ramps the error amplifier reference independently of output voltage, preventing reverse current flow and avoiding discharge of existing output capacitance - critical for multi-rail systems.
How does the MODE pin affect efficiency at light loads?
When the MODE pin is left unconnected, the MAX15462AATA+T operates in PFM mode, disabling negative inductor current and skipping pulses below ~55mA load - achieving >85% efficiency at 100µA. When grounded, it forces PWM mode with constant 500kHz switching, which lowers light-load efficiency but ensures EMI predictability.
What is the function of the RESET pin on the MAX15462AATA+T?
The RESET pin on the MAX15462AATA+T is an open-drain output that asserts low when the regulated 3.3V output falls below 92% of nominal (3.04V) and releases to high-impedance 2ms after the output rises above 95% (3.14V). It provides system-level power-good monitoring without external supervision ICs.
Can the MAX15462AATA+T be used with all-ceramic output capacitors?
Yes, the MAX15462AATA+T is fully compatible with all-ceramic output capacitors. Its internally compensated current-mode control architecture and optimized loop response eliminate the need for electrolytic or tantalum capacitors - enabling ultra-compact, high-reliability layouts with 10µF X7R ceramics.
MAX15462AATA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 8-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 300mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x2)
MAX15462AATA+T FAQ
1.How can I place an order for MAX15462AATA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX15462AATA+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 MAX15462AATA+T reliable?
The price and inventory of MAX15462AATA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX15462AATA+T is usually 5 days.
3.What payment methods are accepted for MAX15462AATA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX15462AATA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX15462AATA+T?
MAX15462AATA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX15462AATA+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 MAX15462AATA+T?
For technical support, including MAX15462AATA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX15462AATA+T requirements.
6.How does Aetrix verify that MAX15462AATA+T is sourced from the original manufacturer or authorized distributors?
All MAX15462AATA+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 MAX15462AATA+T meets industry standards.
7.What is the process for return or replacement of MAX15462AATA+T?
All MAX15462AATA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX15462AATA+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 MAX15462AATA+T part is unused and in its original packaging.
Return procedure for MAX15462AATA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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