OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LT3468ES5-1#TRMPBF

P1-P3P4-P6P7-P9P10-P12
LT3468/LT3468-1/LT3468-2
4
346812fa
LT3468-1 Switch Current Limit
LT3468-1 Output VoltageLT3468 Output Voltage
LT3468 Switch Current Limit
V
IN
(V)
2345678
V
OUT
(V)
3468 G13
324
323
322
318
319
320
321
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
V
IN
(V)
2345678
V
OUT
(V)
3468 G14
324
323
322
318
319
320
321
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
TEMPERATURE (°C)
–40 –20 0 20 40 60 10080
I
LIM
(A)
3468 G16
1.5
1.1
1.2
1.3
1.4
V
IN
= 3V
V
OUT
= 0V
TEMPERATURE (°C)
–40 –20 0 20 40 60 10080
I
LIM
(A)
3468 G17
0.700
0.500
0.540
0.580
0.620
0.660
V
IN
= 3V
V
OUT
= 0V
TYPICAL PERFOR A CE CHARACTERISTICS
UW
LT3468 curves use the circuit of Figure 6, LT3468-1
curves use the circuit of Figure 7 and LT3468-2 use the circuit of Figure 8 unless otherwise noted.
LT3468 Efficiency LT3468-1 Efficiency
V
OUT
(V)
50 100 150 200 250 300
EFFICIENCY (%)
3468 G10
90
80
40
50
60
70
V
IN
= 2.8V
V
IN
= 4.2V
T
A
= 25°C
V
IN
= 3.6V
V
OUT
(V)
50 100 150 200 250 300
EFFICIENCY (%)
3468 G11
90
80
40
50
60
70
V
IN
= 2.8V
V
IN
= 4.2V
V
IN
= 3.6V
T
A
= 25°C
TEMPERATURE (°C)
–40
I
LIM
(A)
1.00
0.96
0.92
0.88
0.84
0.80
0
40
60
34682 G18
–20
20
80
100
V
IN
= 3V
V
OUT
= 0V
V
OUT
(V)
50
EFFICIENCY (%)
90
80
70
60
50
40
250
3468 G12
100
150
200
300
T
A
= 25°C
V
IN
= 4.2V
V
IN
= 2.8V
V
IN
= 3.6V
V
IN
(V)
V
OUT
(V)
319
318
317
316
315
314
313
312
3468 G15
2
3
45678
T
A
= 25°C
T
A
= 85°C
T
A
= –40°C
LT3468-2 Switch Current Limit
LT3468-2 Output Voltage
LT3468-2 Efficiency
LT3468/LT3468-1/LT3468-2
5
346812fa
LT3468 Switching Waveform
LT3468/LT3468-1/LT3468-2
Switch Breakdown Voltage
LT3468-1 Switching Waveform
V
IN
= 3.6V
V
OUT
= 100V
3468 G19
1µs/DIV
V
SW
10V/DIV
I
PRI
1A/DIV
V
IN
= 3.6V
V
OUT
= 300V
3468 G23
1µs/DIV
V
SW
10V/DIV
I
PRI
1A/DIV
LT3468 curves use the circuit of Figure 6, LT3468-1
curves use the circuit of Figure 7 and LT3468-2 use the circuit of Figure 8 unless otherwise noted.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
V
SW
10V/DIV
I
PRI
1A/DIV
1µs/DIV
3468 G21
V
IN
= 3.6V
V
OUT
= 100V
V
SW
10V/DIV
I
PRI
1A/DIV
1µs/DIV
3468 G24
V
IN
= 3.6V
V
OUT
= 300V
SWITCH VOLTAGE (V)
0 102030405060708090100
SWITCH CURRENT (mA)
3468 G25
10
9
8
7
6
5
4
3
2
1
0
T = –40°C
T = 25°C
T = 85°C
SW PIN IS RESISTIVE UNTIL BREAKDOWN
VOLTAGE DUE TO INTEGRATED
RESISTORS. THIS DOES NOT INCREASE
QUIESCENT CURRENT OF PART
V
IN
= V
CHARGE
= 5V
LT3468 Switching Waveform
3468 G20
1µs/DIV
V
SW
10V/DIV
I
PRI
1A/DIV
V
IN
= 3.6V
V
OUT
= 300V
LT3468-1 Switching Waveform
V
IN
= 3.6V
V
OUT
= 100V
3468 G22
1µs/DIV
V
SW
10V/DIV
I
PRI
1A/DIV
LT3468-2 Switching Waveform
LT3468-2 Switching Waveform
LT3468/LT3468-1/LT3468-2
6
346812fa
SW (Pin 1): Switch Pin. This is the collector of the internal
NPN Power switch. Minimize the metal trace area con-
nected to this pin to minimize EMI. Tie one side of the
primary of the transformer to this pin. The target output
voltage is set by the turns ratio of the transformer.
Choose Turns Ratio N by the following equation:
N
V
OUT
=
+ 2
31 5.
Where: V
OUT
is the desired output voltage.
You must tie a Schottky diode from GND to SW, with the
anode at GND for proper operation of the circuit.
Please
refer to the applications section for further information.
GND (Pin 2): Ground. Tie directly to local ground plane.
DONE (Pin 3): Open NPN Collector Indication Pin. When
target output voltage is reached, NPN turns on. This pin
needs a pull-up resistor or current source.
CHARGE (Pin 4): Charge Pin. This pin must be brought
high (>1V) to enable the part. A low (<0.3V) to high (>1V)
transition on this pin puts the part into power delivery
mode. Once the target output voltage is reached, the part
will stop charging the output. Toggle this pin to start
charging again. Ground to shut down. You may bring this
pin low during a charge cycle to halt charging at any time.
V
IN
(Pin 5): Input Supply Pin. Must be locally bypassed
with a good quality ceramic capacitor. Input supply must
be 2.5V or higher.
UU
U
PI FU CTIO S
BLOCK DIAGRA
W
V
IN
SW
+
DONE
CHARGE
C1
T1
R2
60k
Q1
ENABLE
C
OUT
PHOTOFLASH
CAPACITOR
36mV
20mV
TO BATTERY
D2
Q2
V
OUT
D1
LT3468: R
SENSE
= 0.015Ω
LT3468-2: R
SENSE
= 0.022Ω
LT3468-1: R
SENSE
= 0.03Ω
3486 BD
1
GND
53
4 2
+
–
–
+
–
+
–
+
+–
ONE-
SHOT
ONE-
SHOT
DRIVER
PRIMARY SECONDARY
MASTER
LATCH
R
SENSE
DCM COMPARATOR
V
OUT
COMPARATOR
R1
2.5k
S
RQ
1.25V
REFERENCE
Q3
Q1
QQ
SR
A3
A1
A2
CHIP ENABLE
Figure 1
P1-P3P4-P6P7-P9P10-P12

LT3468ES5-1#TRMPBF

Mfr. #:
Buy LT3468ES5-1#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 225mA Photoflash Capacitor Charger
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet