LT1176/LT1176-5
Step-Down
Switching Regulator
FEATURES n n n n n n and all current limit components are included on the chip.
The topology is a classic positive buck configuration but
several design innovations allows this device to be used as
a positive-to-negative converter, a negative boost converter,
and as a flyback converter. The switch output is specified
to swing below ground. 1.2A Onboard Switch
100kHz Switching Frequency
Excellent Dynamic Behavior
DIP and Surface Mount Packages
Only 8mA Quiescent Current
Preset 5V Output Available
Operates Up to 35V Input
Micropower Shutdown Mode The LT1176 uses a true analog multiplier in the feedback
loop. This makes the device respond nearly instantaneously
to input voltage fluctuations and makes loop gain independent of input voltage. As a result, dynamic behavior of the
regulator is significantly improved over previous designs. APPLICATIONS On-chip pulse by pulse current limiting makes the LT1176
nearly bust proof for output overloads or shorts. The input
voltage range as a buck converter is 8V to 35V, but a self
boot feature allows input voltages as low as 5V in the
inverting and boost configurations. Buck Converter with Output Voltage Range of …