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No RSENSE Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller
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LTC3873
No RSENSETM Constant
Frequency Current Mode
Boost/Flyback/SEPIC
DC/DC Controller
FEATURES DESCRIPTION n n n n n n n VIN and VOUT Limited Only by External Components
Internal or Programmable External Soft-Start
Constant Frequency 200kHz Operation
Adjustable Current Limit
Current Sense Resistor Optional
Maximum 60V on SW Node with RDS(ON) Sensing
±1.5% Voltage Reference Accuracy
Current Mode Operation for Excellent Line and Load
Transient Response
n Low Quiescent Current: 300µA
n Low Profile (1mm) ThinSOTTM and (0.75mm)
2mm × 3mm DFN Package The LTC®3873 is a constant frequency current mode,
boost, flyback or SEPIC DC/DC controller that drives an
N-channel power MOSFET in high input and output voltage converter applications. Soft-start can be programmed
using an external capacitor. APPLICATIONS The LTC3873 is available in 8-lead ThinSOT and 2mm ×
3mm DFN packages. n The LTC3873 provides ±1.5% output voltage accuracy and
consumes only 300μA quiescent current during normal
operation and only 55μA during micropower start-up. …