Datasheet LT1913 (Analog Devices)

LT1913 25V, 3.5A, 2.4MHz Step-Down Switching Regulator
U FEATURES DESCRIPTIO
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Wide Input Range: 3.6V to 25V
The LT®1913 is an adjustable frequency (200kHz to ■
3.5A Maximum Output Current
2.4MHz) monolithic buck switching regulator that accepts ■
Adjustable Switching Frequency: 200kHz to 2.4MHz
input voltages up to 25V. A high effi ciency 95m switch ■
Low Shutdown Current: IQ < 1μA
is included on the die along with a boost Schottky diode ■
Integrated Boost Diode
and the necessary oscillator, control, and logic circuitry. ■
Synchronizable Between 250kHz to 2MHz
Current mode topology is used for fast transient response ■ Power Good Flag and good loop stability. Shutdown reduces input supply ■ Saturating Switch Design: 95m On-Resistance current to less than 1μA while a resistor and capacitor on ■ 0.790V Feedback Reference Voltage the RUN/SS pin provide a controlled output voltage ramp ■ Output Voltage: 0.79V to 25V (soft-start). A power good fl ag signals when VOUT reaches ■ Thermal Protection 91% of the programmed output voltage. The LT1913 is ■ Soft-Start Capability available in 10-Pin 3mm × 3mm DFN packages with ex- ■ Small 10-Pin (3mm × 3mm) DFN Packages posed pads for low thermal resistance. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
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All other trademarks are the property of their respective owners.
APPLICATIO S
■ Automotive Battery Regulation ■ Power for Portable Products ■ Distributed Supply Regulation ■ Industrial Supplies ■ Wall Transformer Regulation
U TYPICAL APPLICATIO 5V Step-Down Converter Effi ciency
V V OUT IN 5V 100 6.5V TO 25V 3.5A V V IN BD IN = 12V 90 OFF ON RUN/SS BOOST 0.47μF 80 V 15k 4.7μH IN = 24V V LT1913 SW C 10μF RT 70 680pF EFFICIENCY (%) PG 536k 60 63.4k V SYNC FB OUT = 5V GND L = 4.7μH f = 600kHz 100k 47μF 50 0 0.5 1 1.5 2 2.5 3 3.5 OUTPUT CURRENT (A) 1913 TA01a 1913 G01 1913f 1