Datasheet Texas Instruments LM3000 — 数据表

LM3000
www.ti.com SNVS612B – JULY 2009 – REVISED APRIL 2013 LM3000 Dual Synchronous Emulated Current-Mode Controller
Check for Samples: LM3000 FEATURES DESCRIPTION The LM3000 is a dual output synchronous buck
controller which is designed to convert input voltages
ranging from 3.3V to 18.5V down to output voltages
as low as 0.6V. The two outputs switch at a constant
programmable frequency of 200 kHz to 1.5 MHz, with
the second output 180 degrees out of phase from the
first to minimize the input filter requirements. The
switching frequency can also be phase locked to an
external frequency. A CLKOUT provides an external
clock 90 degrees out of phase with the main clock so
that a second chip can be run out of phase with the
main chip. The emulated current-mode control utilizes
bottom side FET sensing to provide fast transient
response and current limit without the need for
external current sense resistors or RC networks.
Separate Enable, Soft-Start and Track pins allow
each output to be controlled independently to provide
maximum flexibility in designing system power
sequencing. 1 2 VIN Range FROM 3.3V to 18.5V
Output Voltage From 0.6V to 80% of VIN
Remote Differential Output Voltage Sensing …