LT3420EMS-1#TRPBF Linear Technology, LT3420EMS-1#TRPBF Datasheet - Page 15

• Manufacturer Part Number: LT3420EMS-1#TRPBF
• Description: IC PHOTOFLASH CAP CHARGER 10MSOP
• Manufacturer: Linear Technology

Specifications of LT3420EMS-1#TRPBF

• Applications: Photoflash Capacitor Charger
• Current - Supply: 90µA
• Voltage - Supply: 2.2 V ~ 16 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIO S I FOR ATIO
BOARD LAYOUT
The high voltage operation of the LT3420/LT3420-1
demands careful attention to board layout. You will not
get advertised performance with careless layout. Fig-
ures 11 and 12 show the recommended component
placement. Keep the area for the high voltage end of the
secondary as small as possible. Note the larger than
minimum spacing for all high voltage nodes. This is
U
U
V
V
GND
GND
V
V
BAT
BAT
CC
CC
R2
R2
C2
C2
W
Figure 11. Suggested Layout (MS10 Package)
C1
C1
Figure 12. Suggested Layout (DD Package)
U
C3
C3
necessary to meet the breakdown specifications for the
circuit board. If the Photoflash capacitor is placed far
from the LT3420/LT3420-1 circuit, place a small (20nF-
50nF) ceramic capacitor with sufficient voltage rating
close to the part. This insures adequate bypassing.
Remember that LETHAL VOLTAGES ARE PRESENT in
this circuit. Use caution when working with the circuit.
R1
R1
CHARGE DONE
CHARGE DONE
T1
T1
D1A
D1A
PHOTOFLASH
PHOTOFLASH
CAPACITOR
CAPACITOR
LT3420/LT3420-1
3420 F11
3420 F12
–
–
+
+
D1B
D1B
V
V
OUT
OUT
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