MAX17245
3.5V–36V, 3.5A, Synchronous Buck Converter With 28μA Quiescent Current and Reduced EMI
Extend Battery Life with Low Quiescent Current and Synchronous Conversion
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Overview
Features and Benefits
- Eliminates External Components and Reduces Total Cost
- Integrated High-Side and Low-Side Switch Enables Synchronous Operation for High Efficiency and Reduced Cost
- All-Ceramic Capacitor Solution Allows Ultra-Compact Solution Size
- 220kHz to 2.2MHz Adjustable Frequency with External Synchronization
- Power Good Output and High-Voltage EN Input Simplify Power Sequencing
- Increases Design Flexibility
- 180° Out-of-Phase Clock Output at SYNCOUT Enables Cascaded Power Supplies for Increased Power Output
- Fixed Output Voltage with ±2% Accuracy (5V/3.3V) or Externally Resistor Adjustable (1V to 10V)
- Reduces Power Dissipation
- >90% Peak Efficiency
- PWM and PFM Operation Optimizes Conversion Efficiency From Heavy to Light Loads
- Automatic LX Slew-Rate Adjustment for Optimum Efficiency Across Operating Frequency Range
- Low 5µA (typ.) Shutdown Current
- Low 28µA (typ.) Quiescent Current
- Operates Reliably
- 42V Input Voltage Transient Protection
- Fixed 8ms Internal Software Start Reduces Input Inrush Current
- Cycle-by-Cycle Current limit, Thermal Shutdown with Automatic Recovery
- Reduced EMI Emission with Spread-Spectrum Control
Product Details
The MAX17245 high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 3.5V to 36V input voltage range with 42V input transient protection. The MAX17245 can operate in dropout condition by running at 98% duty cycle. This converter delivers up to 3.5A and generates fixed output voltages of 3.3V/5V, along with the ability to program the output voltage between 1V to 10V.
The MAX17245 uses a current-mode control architecture and can operate in the pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. PWM operation provides constant frequency operation at all loads and is useful in applications sensitive to switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. Under light-load applications, the external sync pin FSYNC logic input allows the device to operate in either PFM mode for reduced current consumption or fixed-frequency PWM (forced-PWM) mode to eliminate frequency variation to minimize EMI. Fixed-frequency PWM mode is extremely useful for power supplies designed for RF transceivers where tight emission control is necessary.
This device is available in a compact 16-pin (5mm × 5mm) TQFN package with exposed pad and 16-pin TSSOP. -40°C to +85°C operation.
Applications
- Distributed Supply Regulation
- General-Purpose Point-of-Load
- Wall Transformer Regulation
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
Tools & Simulations
EE-Sim® Power Tools
The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.
SIMPLIS Models
Product Recommendations
MAX17245 Companion Parts
Recommended Related Parts
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| MAX17245ETERA+ | Material Declaration | Reliability Data | 16-LFCSP-5X5X0.75 | |
| MAX17245ETERB+ | Material Declaration | Reliability Data | 16-LFCSP-5X5X0.75 | |
| MAX17245ETESA+ | Material Declaration | Reliability Data | 16-LFCSP-5X5X0.75 | |
| MAX17245ETESA+T | Material Declaration | Reliability Data | 16-LFCSP-5X5X0.75 | |
| MAX17245ETESB+ | Material Declaration | Reliability Data | 16-LFCSP-5X5X0.75 | |
| Wafer Fabrication Data |
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