LT1578 Linear Technology, LT1578 Datasheet - Page 16

• Manufacturer Part Number: LT1578
• Description: 1.5A/ 200kHz Step-Down Switching Regulator
• Manufacturer: Linear Technology

LT1578/LT1578-2.5
APPLICATIONS
16
AND TERMINATE
TO REGULATOR
(NORMALLY EXISTS AS INTERNAL PLANE)
GROUND RING NEED NOT BE AS SHOWN
DIODE CLOSE
THEM TO THE
SAME POINT
KEEP INPUT
CAPACITOR
AND CATCH
AND BOOST NODE
OF CONNECTIONS
TO SWITCH NODE
MINIMIZE AREA
CAPACITOR DIRECTLY
TO HEAVY GROUND
CONNECT OUTPUT
U
INFORMATION
D1
C3
U
GND
L1
V
IN
SW
C1
W
V
IN
C2
BOOST
Figure 5. Suggested Layout for LT1578
D2
Figure 6. High Speed Switching Path
TAKE OUTPUT DIRECTLY FROM END
OF OUTPUT CAPACITOR TO AVOID
PARASITIC RESISTANCE AND
INDUCTANCE (KELVIN CONNECTION)
V
U
OUT
CIRCULATING
FREQUENCY
SWITCH NODE
PATH
HIGH
SYNC
SHDN
R1
FB
V
L1
GND
C
OF FEEDBACK PIN
TO AVOID PICKUP
MINIMIZE SIZE
CONNECTIONS
R2
C
C
LOAD
1578 F06
5V
R
C
1578 F05
TERMINATE
FEEDBACK
RESISTORS AND
COMPENSATION
COMPONENTS
DIRECTLY TO
SWITCHER
GROUND PIN