Datasheet Analog Devices LTC3410 — Даташит

LTC3410
2.25MHz, 300mA
Synchronous Step-Down
Regulator in SC70
U FEATURES DESCRIPTIO ■ The LTC ®3410 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current
mode architecture. The device is available in adjustable
and fixed output voltage versions. Supply current during
operation is only 26µA, dropping to 2.5V 10µH or 2x 4.7µF 4.7µF If tantalum capacitors are used, it is critical that the
capacitors are surge tested for use in switching power
supplies. An excellent choice is the AVX TPS series of
surface mount tantalum. These are specially constructed
and tested for low ESR so they give the lowest ESR for a
given volume. Other capacitor types include Sanyo
POSCAP, Kemet T510 and T495 series, and Sprague 593D
and 595D series. Consult the manufacturer for other
specific recommendations. Output Voltage Programming (LTC3410 Only) Using Ceramic Input and Output Capacitors The efficiency of a switching regulator is equal to the
output power divided by the input power times 100%. It is
often useful to analyze individual losses to determine what
is limiting the efficiency and which change would produce
the most improvement. Efficiency can be expressed as: Higher values, lower cost ceramic capacitors are now
becoming available in smaller case sizes. Their high ripple
current, high voltage rating and low ESR make them ideal
for switching regulator applications. Because the …