LT3484EDCB-2#TR Linear Technology, LT3484EDCB-2#TR Datasheet - Page 10

IC PHOTOFLASH CAP CHARGER 6-DFN

LT3484EDCB-2#TR

Manufacturer Part Number
LT3484EDCB-2#TR
Description
IC PHOTOFLASH CAP CHARGER 6-DFN
Manufacturer
Linear Technology
Datasheet

Specifications of LT3484EDCB-2#TR

Applications
Photoflash Capacitor Charger
Current - Supply
5mA
Voltage - Supply
1.7 V ~ 16 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
6-DFN
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LT3484EDCB-2#TRLT3484EDCB-2
Manufacturer:
LT
Quantity:
10 000
LT3484-0/LT3484-1/LT3484-2
APPLICATIO S I FOR ATIO
Table 3. Recommended Output Diodes
PART
GSD2004S
(Dual Diode)
BAV23S
(Dual Diode)
MMBD3004S
(Dual Diode)
Board Layout
The high voltage operation of the LT3484-0/LT3484-1/
LT3484-2 demands careful attention to board layout. You
will not get advertised performance with careless layout.
Figure 5 shows the recommended component placement.
Keep the area for the high voltage end of the secondary as
small as possible. Also note the larger than minimum
spacing for all high voltage nodes in order to meet break-
down voltage requirements for the circuit board. It is
imperative to keep the electrical path formed by C1, the
primary of T1, and the LT3484-0/LT3484-1/LT3484-2 as
short as possible. If this path is haphazardly made long, it
will effectively increase the leakage inductance of T1,
which may result in an overvoltage condition on the
SW pin.
10
TYPICAL APPLICATIO S
2.5V TO 8V
V
IN
1.8V TO 8V
C1: 4.7µF, X5R OR X7R, 10V
T1: KIJIMA MUSEN PART# SBL-5.6-1, L
D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES
R1: PULL UP RESISTOR NEEDED IF DONE PIN USED
CHARGE
Figure 6. LT3484-0 Photoflash Charger Uses
High Efficiency 4mm Tall Transformer
DONE
V BAT
C2
0.1µF
MAX REVERSE VOLTAGE
R1
100k
C1
4.7µF
U
2x300
2x250
2x350
(V)
3
1
2
V
DONE
CHARGE
V
IN
BAT
6
LT3484-0
U
PRI
SW
GND
4, 5
= 10µH, N = 10.2
1
2
U
MAX FORWARD CONTINUOUS CURRENT
7
1:10.2
W
T1
4
5
D1
+
U
(mA)
C
PHOTOFLASH
CAPACITOR
225
225
225
3484 F06
320V
OUT
CHARGE
2.5V TO 8V
Figure 5. Suggested Layout: Keep Electrical Path Formed by C1,
Transformer Primary and LT3484-0/LT3484-1/LT3484-2 Short
DONE
V
IN
V
IN
R1
1.8V TO 8V
C1: 4.7µF, X5R OR X7R, 10V
T1: KIJIMA MUSEN PART# SBL-5.6S-1, L
D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES
R1: PULL UP RESISTOR NEEDED IF DONE PIN USED
CHARGE
Figure 7. LT3484-1 Photoflash Charger Uses
High Efficiency 3mm Tall Transformer
DONE
V BAT
CAPACITANCE
C2
1
2
3
C2
0.1µF
(pF)
5
5
5
R1
100k
C1
4.7µF
3
1
2
V
DONE
CHARGE
V
IN
BAT
6
LT3484-1
6
5
4
C1
SW
GND
V
PRI
BAT
4, 5
4
3
= 24µH, N = 10.2
Philips Semiconductor
7
1:10.2
www.philips.com
www.diodes.com
www.vishay.com
T1
(402) 563-6866
(800) 447-1500
(816) 251-8800
T1
Diodes Inc
VENDOR
5
6
Vishay
D1
(DUAL DIODE)
+
PHOTOFLASH
CAPACITOR
D1
C OUT
PHOTOFLASH
CAPACITOR
320V
C
OUT
3484012f
3484 F05
+
3484 F07

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