The MAX17574, high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 60V input. The converter can deliver up to 3A current. Output voltage is programmable from 0.9V to 90%VIN. The feedback voltage regulation accuracy over -40°C to +125°C is ±0.9%.
The MAX17574 features a peak-current-mode control architecture. The device can be operated in the pulse-width modulation (PWM), pulse-frequency modulation (PFM) or discontinuous-conduction mode (DCM) control schemes. A programmable soft-start feature allows users to reduce input inrush current. The device also incorporates an output enable/undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired input voltage level. An open-drain active-low RESET pin provides a delayed power-good signal to the system upon achieving successful regulation of the output voltage.
The MAX17574 is available in a 24-pin (4mm x 5mm) TQFN package. Simulation models are available.
关键特性
Reduces External Components and Total Cost
No Schottky-Synchronous Operation
Internal Compensation for Any Output Voltage
All-Ceramic Capacitors, Compact Layout
Reduces Number of DC-DC Regulators to Stock
Wide 4.5V to 60V Input
Output Adjustable from 0.9V to 90%VIN
Delivers up to 3A Current Over Temperature
100kHz to 2.2MHz Adjustable Switching Frequency with External Synchronization
Reduces Power Dissipation
Peak Efficiency > 90%
PFM and DCM Modes Enable Enhanced Light-Load Efficiency
Auxiliary Bootstrap LDO for Improved Efficiency
2.8μA Shutdown Current
Operates Reliably in Adverse Industrial Environments
Hiccup Mode Overload Protection
Adjustable Soft-Start and Prebiased Power-Up
Built-In Output-Voltage Monitoring with Active-Low RESET
Programmable EN/UVLO Threshold
Monotonic Startup Into Prebiased Load
Overtemperature Protection
High Industrial -40°C to +125°C Ambient Operating Temperature Range/-40°C to +150°C Junction Temperature Range
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