FEATURES
■ Constant 500kHz Switching Frequency
■ Easily Synchronizable
■ Uses All Surface Mount Components
■ Inductor Size Reduced to 5μH
■ Saturating Switch Design: 0.4?
■ Effective Supply Current: 2.5mA
■ Shutdown Current: 20μA
■ Cycle-by-Cycle Current Limiting
APPLICATIO S
■ Portable Computers
■ Battery-Powered Systems
■ Battery Charger
■ Distributed Power
DESCRIPTIO U
The LT ?
1375/LT1376 are 500kHz monolithic buck mode
switching regulators. A 1.5A switch is included on the die
along with all the necessary oscillator, control and logic
circuitry. High switching frequency allows a considerable
reduction in the size of external components. The topology
is current mode for fast transient response and good loop
stability. Both fixed output voltage and adjustable parts are
available.
A special high speed bipolar process and new design
techniques achieve high efficiency at high switching frequency.
Efficiency is maintained over a wide output current
range by using the output to bias the circuitry and by
utilizing a supply boost capacitor to saturate the power
switch. A shutdown signal will reduce supply current to
20μA on both parts. The LT1375 can be externally synchronized
from 550kHz to 1MHz with logic level inputs.
The LT1375/LT1376 fit into standard 8-pin PDIP and SO
packages, as well as a fused lead 16-pin SO with much
lower thermal resistance. Full cycle-by-cycle short-circuit
protection and thermal shutdown are provided.
Standard surface mount external parts are used, including
the inductor and capacitors.
For low input voltage applications with 3.3V output, see
LT1507. This is a functionally identical part that can
operate with input voltages between 4.5V and 12V.
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