ADI ADP2442ACPZ-R7

The ADP2442 is a constant-frequency, current-mode control synchronous buck dc-dc regulator capable of driving loads up to 1 A with excellent line and load regulation. It operates over a wide input voltage range (4.5 V to 36 V), making it ideal for regulating power from a variety of input sources. Its very short minimum on-time (50 ns) makes it well suited for applications requiring very high step-down ratios. The output voltage is adjustable from 0.6 V to 0.9×Vin. The device integrates low-resistance N-channel MOSFETs for both the high-side and low-side switches to achieve high efficiency. The switching frequency is adjustable via an external resistor over a range of 300 kHz to 1 MHz. The ADP2442 also provides a precise power-good (PGOOD) open-drain output signal. It offers flexible external clock synchronization. The switching frequency can be synchronized to an external clock applied to the SYNC/MODE pin. The ADP2442 can also be configured to operate in forced fixed-frequency mode to reduce EMI, or in power-save mode to reduce switching losses at light loads. The ADP2442 uses hiccup mode to protect the IC against short-circuit or output overcurrent conditions. Internal soft-start limits inrush current during startup with a wide range of load capacitances. Additional key features include input undervoltage lockout (UVLO), thermal shutdown (TSD), and a precision enable (EN) that can also be used as a logic-level shutdown input. The ADP2442 is available in a 3 mm×3 mm, 12-lead LFCSP package and is rated for an operating junction temperature range of −40°C to +125°C.

• Wide input voltage range: 4.5 V to 36 V
• Minimum on-time: 50 ns (typical)
• Maximum load current: 1 A
• High efficiency: up to 94%
• Adjustable output: as low as 0.6 V
• Output voltage accuracy: ±1%
• Adjustable switching frequency: 300 kHz to 1 MHz
• External synchronization frequency range: 300 kHz to 1 MHz
• Pulse skip mode or forced fixed-frequency mode
• Precision enable input pin (EN)
• Open-drain power good indicator
• Internal soft-start
• Overcurrent limit protection
• Shutdown current less than 75 μA
• UVLO and thermal shutdown
• 12-lead 3 mm×3 mm LFCSP package
• ADIsimPower toolset support

• Terminal load applications
• Distributed power systems
• Industrial control power supplies
• Standard supply rail conversion to 24 V/12 V/5 V/3.3 V