NCP3170

Synchronous PWM Switching Converter

The NCP3170 is a flexible synchronous PWM Switching Buck Regulator. The NCP3170 operates from 4.5 V to 18 V, sourcing up to 3 A and is capable of producing output voltages as low as 0.8 V. The NCP3170 also incorporates current mode control. To reduce the number of external components, a number of features are internally set including soft start, power good detection, and switching frequency. The NCP3170 is currently available in an SOIC−8 package.

Features

• 4.5 V to 18 V Operating Input Voltage Range

• 90 m High-Side, 25 m Low-Side Switch

• FMEA Fault Tolerant During Pin Short Test

• 3 A Continuous Output Current

• Fixed 500 kHz and 1 MHz PWM Operation

• Cycle-by-Cycle Current Monitoring

• 1.5% Initial Output Accuracy

• Internal 4.6 ms Soft-Start

• Short-Circuit Protection

• Turn on Into Pre-bias

• Power Good Indication

• Light Load Efficiency

• Thermal Shutdown

• These are Pb-Free Devices

Typical Applications

• Set Top Boxes

• DVD/Blu−ray Drives and HDD

• LCD Monitors and TVs

• Cable Modems

• PCIe Graphics Cards

• Telecom/Networking/Datacom Equipment

• Point of Load DC/DC Converters

ABSOLUTE MAXIMUM RATINGS (measured vs. GND pin 3, unless otherwise noted)

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.

1. The maximum package power dissipation limit must not be exceeded.

P_D= [T_J(max) - T_A] / R_θJA

2. The value of JA is measured with the device mounted on 2in x 2in FR−4 board with 2oz. copper, in a still air environment with TA = 25°C. The value in any given application depends on the user’s specific board design.

3. 60−180 seconds minimum above 237°C.

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