DESCRIPTION
The LT3667 isa monolithic triple power supply composed of a400mA buck switching regulator and two200mA low dropout linear regulators (LDOs).
The buck regulator includes a high efficiency switch, a boost  diode,  and  the  necessary  oscillator,  control  and logic  circuitry.  Current  mode  topology  is  used  for  fast transient  response  and  good  loop  stability.  Low  ripple Burst  Mode  operation  maintains  high  efficiency  at  low output currents while keeping output ripple below15mV in a typical application.
Each LDO supplies200mA of output current with a typical dropout voltage of340mV, and each LDO has an accurate resistor programmable current limit.

FEATURES
■ Triple Output Supply from a Single Input Requires
   Only One Inductor
■ IQ = 50μA at 12VIN to 5V, 3.3V and 2.5V with No Load
■ Buck Regulator:
   Low Ripple (<15mVP-P) Burst Mode Operation®
   400mA Output with Internal Power Switch
   4.3V to 40V Input Operation Range (60V Max)
■ Dual Low Dropout Linear Regulators
   200mA Outputs with Programmable Current Limits
   1.6V to 45V Input Range
   Fault Protected to ±45V
■ Adjustable 250kHz to 2.2MHz Switching Frequency
■ Synchronizable Between 300kHz and 2.2MHz
■ Programmable Undervoltage Lockout
■ Power Good Indicators
■ Available in a Thermally-Enhanced 16-Lead MSOP
   and 24-Lead (3mm × 5mm) QFN Packages

APPLICATIONS
■ Automotive Battery Regulation
■ Power for Portable Instrumentation
■ Industrial Supplies
■ Fault-Protected Sensor Supply