Datasheet Texas Instruments LM3224 — 数据表

LM3224
www.ti.com SNVS277C – DECEMBER 2004 – REVISED MARCH 2013 LM3224 615kHz/1.25MHz Step-up PWM DC/DC Converter
Check for Samples: LM3224 FEATURES DESCRIPTION The LM3224 is a step-up DC/DC converter with a
0.15О© (typ.), 2.45A (typ.) internal switch and pin
selectable operating frequency. With the ability to
convert 3.3V to multiple outputs of 8V, -8V, and 23V,
the LM3224 is an ideal part for biasing TFT displays.
With the high current switch it is also ideal for driving
high current white LEDs for flash applications. The
LM3224 can be operated at switching frequencies of
615kHz and 1.25MHz allowing for easy filtering and
low noise. An external compensation pin gives the
user flexibility in setting frequency compensation,
which makes possible the use of small, low ESR
ceramic capacitors at the output. An external softstart pin allows the user to control the amount of
inrush current during start up. The LM3224 is
available in a low profile 8-lead VSSOP package. 1 2 Operating Voltage Range of 2.7V to 7V
615kHz/1.25MHz Pin Selectable Frequency
Operation
Over Temperature Protection
Optional Soft-Start Function
8-Lead VSSOP Package APPLICATIONS TFT Bias Supplies
Handheld Devices …