LINEAR TECHNOLOGY - LT1939 Manual

Update: 28 September, 2023

The LT1939 is a current mode PWM step-down DC/DC converter with an internal 2.3A switch. It is suitable for regulating power from a wide variety of sources (including automotive batteries, industrial supplies, and unregulated wall adapters). The adjustable/synchronizable fixed frequency operation from 250kHz to 2.2MHz allows for optimization between efficiency and external component size. It provides protection against a shorted output through cycle-by-cycle current limit, frequency foldback, and thermal shutdown. The soft-start feature controls the ramp rate of the output voltage, eliminating input current surge during start-up, and also provides output tracking. The LT1939 contains an internal NPN transistor with feedback control which can be configured as a linear regulator or as a linear regulator controller. Its low current shutdown mode (<12μA) enables easy power management in battery-powered systems.

Brand: LINEAR

File format: PDF

Size: 360 KB

MD5 Checksum: 2BDDF2DD2D12547D6EA758564D1591AA

Publication date: 09 May, 2012

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