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Analog Devices Inc./Maxim Integrated MAX15462AATA+
- Part No.:
- MAX15462AATA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFDFN
- Datasheet:
-
MAX15462AATA+.pdf
- Description:
- IC REG BUCK 3.3V 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,090
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Product details
Overview
MAX15462AATA+ 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. It operates across a 4.5V–42V input range, features peak-current-mode control, and supports selectable PFM/PWM operation via the MODE pin. Designed for industrial point-of-load regulation in harsh environments, it integrates soft-start, EN/UVLO threshold programming, and open-drain RESET monitoring.
For engineers reviewing the MAX15462AATA+ datasheet, MAX15462AATA+ pinout, MAX15462AATA+ application, or MAX15462AATA+ equivalent, key selection considerations include its 3.3V fixed output, -40°C to +125°C operating range, 500kHz switching frequency, internal compensation, and TDFN-8 (2mm × 2mm) package - all critical for space-constrained, high-reliability industrial power designs.
Technical Context
The MAX15462AATA+ employs a peak-current-mode control architecture with an internal oscillator and slope compensation, enabling stable regulation across wide input/output ratios. Its MODE pin latches at power-up to select between constant-frequency PWM (for EMI-sensitive systems) and pulse-frequency modulation (for light-load efficiency), with no runtime mode switching.
It integrates a 5V LDO (VCC) for gate drive and internal circuitry, featuring 4.75V–5.25V output regulation, 13–50mA current limit, and VCC UVLO with 4.05V rising threshold. Overcurrent protection uses cycle-by-cycle peak limiting (560mA typ), runaway current detection (660mA typ), and hiccup-mode recovery with 131ms timeout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 42V - supports wide industrial input rails including 12V, 24V, and 36V systems without external pre-regulation. |
| Output Voltage | Fixed 3.3V ±1.5% - tightly regulated for powering microcontrollers, sensors, and analog front-ends requiring stable low-noise supply. |
| Max Output Current | 300mA - sufficient for low-power industrial I/O, transmitters, and isolated interface circuits. |
| Switching Frequency | 465kHz to 535kHz - enables compact magnetics and predictable EMI filtering while avoiding AM radio band. |
| Peak Efficiency | 92% at 300mA (VIN=24V, VOUT=3.3V) - minimizes thermal stress and extends battery life in portable industrial equipment. |
| Shutdown Current | 2.2µA (typ) - enables ultra-low-power wake-on-event architectures in always-on sensor nodes. |
| Operating Temperature | -40°C to +125°C ambient - qualified for under-hood, factory-floor, and outdoor industrial deployments. |
Pinout & Package
MAX15462AATA+ is housed in an 8-pin, 2mm × 2mm TDFN package with exposed thermal pad (pin 8 is LX, not GND). The compact footprint supports high-density PCB layouts and efficient thermal transfer to inner ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Primary input rail connection; requires local 1µF X7R ceramic bypass to GND for EMI suppression and transient response. |
| EN/UVLO (Pin 2) | Enable / Input UVLO Control | Active-high enable with programmable turn-on threshold (1.19–1.24V rising); connects to resistor divider from VIN for custom input undervoltage lockout. |
| VCC (Pin 3) | Internal LDO Output | 5V ±5% regulated supply for internal logic and gate drivers; must be bypassed with ≥1µF ceramic capacitor to GND. |
| FB/VOUT (Pin 4) | Feedback Input | Direct connection to 3.3V output for fixed-voltage regulation; internal feedback divider eliminates external resistors for MAX15462A variant. |
| MODE (Pin 5) | Control Mode Selection | Ground = forced-PWM (constant 500kHz); unconnected = PFM (pulse-skipping at light loads for >90% efficiency down to 1mA). |
| RESET (Pin 6) | Open-Drain Reset Monitor | Asserts low when VOUT falls below 92% of nominal; releases high-impedance 2ms after VOUT rises above 95% - enables system-level power-good sequencing. |
| GND (Pin 7) | Power Ground | Primary return path for power and signal currents; must connect to low-impedance ground plane with single-point star topology. |
| LX (Pin 8) | Switch Node | Connection to inductor switch node; carries high di/dt current; requires short, low-inductance trace to minimize ringing and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET Integration | Integrated 1.75Ω high-side pMOS and 0.55Ω low-side nMOS eliminate external FETs and Schottky diodes, reducing BOM count and layout area. |
| Internal Compensation | Eliminates external compensation network - simplifies design, improves stability margin, and removes tuning dependency on output capacitor ESR. |
| Monotonic Soft-Start | 4.1ms controlled ramp-up prevents output overshoot and inrush current into prebiased loads - essential for multi-rail FPGA and MCU systems. |
| Hiccup-Mode Overcurrent Protection | Auto-retry current limiting with 131ms timeout prevents thermal runaway during sustained overload or short-circuit conditions. |
| All-Ceramic Capacitor Support | Stable operation with low-ESR ceramic input/output capacitors only - avoids bulk electrolytics, improving lifetime and temperature reliability. |
Applications
| Industrial Sensor Power | 4–20mA Loop Transmitter |
|---|---|
Use Scenario: Powering precision analog sensors (e.g., RTD, pressure, gas) in factory automation cabinets where input voltage varies from 12V to 36V. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator supplying ADC reference, signal conditioning, and microcontroller core voltage. Use Value: Delivers 300mA with <±1.5% output regulation over -40°C to +125°C, ensuring sensor accuracy and long-term drift stability without external trimming. |
Use Scenario: Providing isolated 3.3V rail for loop-powered transmitter ICs (e.g., XTR115) in hazardous-area field devices. IC Role / Device Role / Timing Role: High-input-voltage buck regulator converting 24V loop supply to clean 3.3V for analog front-end and DAC. Use Value: 2.2µA shutdown current enables true "zero-power" sleep mode; PFM mode maintains >85% efficiency at 100µA load - extending loop compliance margin. |
| HVAC Zone Controller | High-Voltage LDO Replacement |
Use Scenario: Powering microcontroller, display, and relay drivers in wall-mounted HVAC thermostats powered from 24VAC rectified supplies. IC Role / Device Role / Timing Role: Main 3.3V DC-DC converter replacing inefficient linear regulators in thermally constrained plastic enclosures. Use Value: 92% peak efficiency reduces heat generation by >70% vs. LDO; TDFN-8 package fits tight 12mm × 12mm board area constraints. |
Use Scenario: Replacing 78L33 or similar 100mA LDOs in legacy industrial modules where input voltage exceeds 30V. IC Role / Device Role / Timing Role: Drop-in high-efficiency buck replacement delivering 300mA at 3.3V from 36V input without heatsink redesign. Use Value: Eliminates thermal derating issues - operates continuously at full load up to +125°C ambient, unlike LDOs limited to <65°C at same power. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36503RNXR | 3.3V fixed, 500mA, 3V–65V input, 2.1MHz switching, no MODE pin (PFM-only), larger SOT-563 package (2.9mm × 2.8mm) | Better suited for ultra-compact, high-frequency designs needing higher current; lacks programmable EN/UVLO and RESET monitoring. | Select LMR36503RNXR if board space allows larger footprint and 500mA output is required; avoid if RESET signaling or precise UVLO programming is needed. |
| TPS54332DRCT | 3.3V fixed, 3A, 3.5V–28V input, adjustable frequency (200kHz–2.5MHz), external compensation, SOIC-8 package | Higher current capability but incompatible input voltage range (max 28V vs. 42V); requires external loop compensation and more board area. | Choose TPS54332DRCT only for lower-voltage, high-current applications where 42V tolerance is unnecessary; MAX15462AATA+ remains superior for 36V industrial rails. |
Compared with LMR36503RNXR and TPS54332DRCT, the MAX15462AATA+ uniquely balances 42V input tolerance, integrated RESET, programmable UVLO, and ultra-small TDFN-8 packaging - making it optimal for space-constrained, high-reliability 3.3V point-of-load conversion in industrial settings.
Availability
MAX15462AATA+ is available at Aetrix Electronics and suitable for industrial sensors, 4–20mA current loops, and HVAC controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX15462AATA+ 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 technologies, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX15462AATA+ belongs to Analog Devices' high-voltage DC-DC converter product line, engineered specifically for robust, ultra-compact power conversion in demanding industrial environments where wide input range, thermal resilience, and functional safety features are mandatory.
FAQ
What is the output voltage tolerance of the MAX15462AATA+ under full load and temperature extremes?
The MAX15462AATA+ delivers a fixed 3.3V output with ±1.5% regulation over load (0–300mA) and temperature (-40°C to +125°C), verified per Electrical Characteristics table: VOUT-REG = 3.25V to 3.35V at full load and TA = +25°C, with minimal drift shown in Figure toc05 and toc09. This ensures reliable operation for 3.3V logic and analog circuits without external trimming.
Can the MAX15462AATA+ start up into a prebiased output without damaging downstream components?
Yes, the MAX15462AATA+ supports monotonic startup into a prebiased output in both PFM and forced-PWM modes, as confirmed in the Detailed Description section. Its soft-start circuit ramps the internal error-amplifier reference without discharging the output capacitor - preventing reverse current flow and protecting sensitive loads like microcontrollers and ADCs.
How does the MODE pin affect efficiency at light loads, and what is the transition threshold?
When MODE is unconnected, the MAX15462AATA+ operates in PFM mode, achieving >90% efficiency at 1mA load (Figure toc01). In forced-PWM mode (MODE = GND), efficiency drops to ~75% at 1mA due to continuous switching losses. The device naturally exits PFM above ~55mA (typ), as documented in the PFM Mode Operation section.
What is the absolute maximum voltage rating for the EN/UVLO pin, and how is UVLO threshold programmed?
The EN/UVLO pin withstands -0.3V to +48V (Absolute Maximum Ratings), enabling direct connection to high-voltage rails. Its rising threshold is 1.19V–1.24V; programming is done using a resistor divider from VIN to EN/UVLO to GND - e.g., for 18V turn-on, use R1 = 133kΩ and R2 = 10kΩ per the EN/UVLO equation in the datasheet.
Does the MAX15462AATA+ include thermal protection, and at what junction temperature does it activate?
Yes, the MAX15462AATA+ incorporates thermal shutdown with a rising threshold of 166°C and 10°C hysteresis (Electrical Characteristics, Thermal Shutdown section). When junction temperature exceeds 166°C, the device halts switching and enters hiccup mode until temperature falls below 156°C, protecting against sustained overloads or poor PCB thermal design.
MAX15462AATA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 8-WFDFN
- Packaging:
- Strip
- 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+ FAQ
1.How can I place an order for MAX15462AATA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX15462AATA+ 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+ reliable?
The price and inventory of MAX15462AATA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX15462AATA+ is usually 5 days.
3.What payment methods are accepted for MAX15462AATA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX15462AATA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX15462AATA+?
MAX15462AATA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX15462AATA+ 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+?
For technical support, including MAX15462AATA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX15462AATA+ requirements.
6.How does Aetrix verify that MAX15462AATA+ is sourced from the original manufacturer or authorized distributors?
All MAX15462AATA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX15462AATA+?
All MAX15462AATA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX15462AATA+, 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+ part is unused and in its original packaging.
Return procedure for MAX15462AATA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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