The LM2734Z regulator is a monolithic, high-frequency, PWM step-down DCDC converter
assembled in a thick 6-pin SOT and a WSON non-pullback package. The device provides all the active
functions to provide local DCDC conversion with fast transient response and accurate regulation in
the smallest possible PCB area.
With a minimum of external components and online design support through
WEBENCH™, the LM2734Z is easy to use. The ability
to drive 1-A loads with an internal 300-mΩ NMOS switch using state-of-the-art 0.5-µm BiCMOS
technology results in the best power density available. The world class control circuitry allows
for ON-times as low as 13 ns, thus supporting exceptionally high-frequency conversion over the
entire 3-V to 20-V input operating range down to the minimum output voltage of 0.8 V. Switching
frequency is internally set to 3 MHz, allowing the use of extremely small surface mount inductors
and chip capacitors. Even though the operating frequency is very high, efficiencies up to 85% are
easy to achieve. External shutdown is included, featuring an ultra-low standby current of 30 nA.
The LM2734Z uses current-mode control and internal compensation to provide high-performance
regulation over a wide range of operating conditions. Additional features include internal
soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and
output overvoltage protection.
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