LT3484EDCB-0#TRPBF Linear Technology, LT3484EDCB-0#TRPBF Datasheet - Page 6

IC PHOTOFLASH CAP CHARGER 6-DFN

LT3484EDCB-0#TRPBF

Manufacturer Part Number
LT3484EDCB-0#TRPBF
Description
IC PHOTOFLASH CAP CHARGER 6-DFN
Manufacturer
Linear Technology
Datasheet

Specifications of LT3484EDCB-0#TRPBF

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
Lead free / RoHS Compliant

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Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LT3484EDCB-0#TRPBFLT3484EDCB-0
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LT3484EDCB-0#TRPBFLT3484EDCB-0#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
PI FU CTIO S
LT3484-0/LT3484-1/LT3484-2
DONE (Pin 1): Open NPN Collector Indication Pin. When
target output voltage is reached, NPN turns on, pulling Pin
1 low. This pin needs a pull-up resistor or current source.
CHARGE (Pin 2): Charge Pin. A low (<0.3V) to high (>1V)
transition on this pin puts the part into power delivery
mode. Once the target voltage is reached, the part will stop
charging the output. Toggle this pin to start charging
again. Bringing the pin low (<0.3V) will terminate the
power delivery and put the part in shutdown.
V
with a good quality ceramic capacitor. Input supply must
be 2.5V or higher.
SW (Pins 4, 5): Switch Pins. These are the collector of the
internal NPN Power switch. Tie these pins together on the
FU CTIO AL BLOCK DIAGRA
6
IN
U
(Pin 3): Input Supply Pin. Must be locally bypassed
U
CHARGE
U
2
LT3484-0: R
LT3484-2: R
LT3484-1: R
MASTER
LATCH
Q3
TO V
1
U
CC
DONE
SHOT
ONE-
Q
S
SENSE
SENSE
SENSE
U
Q
R
ENABLE
= 0.015Ω
= 0.022Ω
= 0.03Ω
TO BATTERY
Q1
3
CHIP
POWER
V
V
OUT
IN
A2
COMPARATOR
+
C1
6
REFERENCE
V
BAT
1.25V
Q2
W
R1
2.5k
60k
R2
Figure 1
SHOT
ONE-
PC Board. Minimize the metal trace area connected to
these pins to minimize EMI. Tie one side of the primary of
the transformer to these pins. The target output voltage is
set by the turns ratio of the transformer.
Choose Turns Ratio N by the following equation:
where V
V
with a good quality ceramic capacitor. Battery supply must
be 1.7V or higher. The other terminal of the transformer
primary must be connected to V
GND (Pin 7): Ground. Tie directly to local ground plane.
BAT
N
R
=
(Pin 6): Battery Supply Pin. Must be locally bypassed
S
V
DCM COMPARATOR
OUT
OUT
Q
31 5 .
A1
A3
+
+
is the desired output voltage.
+ 2
DRIVER
+
20mV
+–
40mV
4, 5
PRIMARY
Q1
R
SW
SENSE
3484 BD
T1
7
GND
BAT
SECONDARY
.
D1
+
C
PHOTOFLASH
CAPACITOR
V
OUT
OUT
3484012f

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