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MAX17244：3.5V–36V, 2.5A, Synchronous Buck Converter With 28μA Quiescent Current and Reduced EMI

Extend Battery Life with Low Quiescent Current and Synchronous Conversion

The MAX17244 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 device can operate in dropout condition by running at 98% duty cycle. This converter delivers up to 2.5A and generates fixed output voltages of 3.3V/5V, along with the ability to program the output voltage between 1V to 10V. The MAX17244 uses a current-mode control architecture. The device 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 either in PFM mode for reduced current consumption or fixed-frequency FPWM (forced-PWM) mode to eliminate frequency variation to minimize EMI. Fixed-frequency FPWM 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 x 5mm) TQFN package with exposed pad and 16-pin TSSOP. -40°C to +85°C operation.

关键特性 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

MAX17244: Internal Block Diagram 应用 配电稳压器 通用负载点电源 壁式变压器稳压

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开发工具

• MAX17244EVKIT

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• MAX17245：3.5V–36V, 3.5A, Synchronous Buck Converter With 28μA Quiescent Current and Reduced EMI

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