Datasheet

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

Summary of content (24 pages)