LT3420 LINER [Linear Technology], LT3420 Datasheet - Page 2

• Manufacturer Part Number: LT3420
• Description: Photoflash Capacitor Chargers with Automatic Refresh
• Manufacturer: LINER [Linear Technology]

ABSOLUTE AXI U RATI GS
LT3420/LT3420-1
(Note 1)
V
V
SW Voltage (Note 2)
SEC Current ...................................................... 200mA
R
R
CHARGE Voltage ...................................................... 16V
CT Voltage .............................................................. 1.5V
DONE Voltage .......................................................... 16V
Current into DONE Pin .......................................... 1mA
Maximum Junction Temperature .......................... 125 C
Operating Ambient Temperature Range
Storage Temperature Range ................. – 65 C to 150 C
Lead Temperature (Soldering, 10 sec).................. 300 C
temperature range, otherwise specifications are at T
PARAMETER
Minimum Operating Voltage, V
Maximum Operating Voltage, V
V
Minimum V
Maximum V
V
R
R
Quiescent Current
Quiescent Current in Shutdown
Primary Side Current Limit
Secondary Side Current Limit
Leakage Blanking Pulse Width
Refresh Timer Charge/Discharge Current
Refresh Timer Upper Threshold
Refresh Timer Lower Threshold
2
ELECTRICAL CHARACTERISTICS
CC
BAT
REF
REF
CC
BAT
FB
REF
LT3420 ................................................................ 38V
LT3420-1 ............................................................ 50V
(Note 3) .............................................. – 40 C to 85 C
UVLO Hysteresis
UVLO Hysteresis
Threshold Voltage
Pin Bias Current
Voltage .............................................................. 16V
Current ........................................................... 3mA
Voltage ............................................................ 16V
Voltage ........................................................... 2.5V
BAT
BAT
Voltage
Voltage
W
CC
CC
W W
U
A
= 25 C. V
CONDITIONS
V
V
V
V
LT3420 (Note 5)
LT3420-1 (Note 5)
LT3420 (Note 5)
LT3420-1 (Note 5)
LT3420
LT3420-1
V
RREF
RFB
RREF
CHARGE
CT
The
= 0.75V
= V
= 0V, Switching
= 1.1V, Not Switching
BAT
= 0V, V
CC
denotes the specifications which apply over the full operating
= V
– 0.2V (Note 4)
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specified with wider operating temperature ranges.
BAT
IN
= 3.3V
T
JMAX
= 3.3V, V
R
V
GND
V
R
REF
BAT
CC
FB
= 125 C,
10-LEAD PLASTIC MSOP
1
2
3
4
5
(4-LAYER BOARD)
MS10 PACKAGE
CHARGE
TOP VIEW
JA
= 100 C/W,
= V
CC
JC
10
9
8
7
6
unless otherwise noted. (Note 3)
= 45 C/W
C
CHARGE
DONE
SEC
SW
T
0.975
MIN
0.98
1.20
0.75
0.45
1.5
0.9
20
5
U
MS PART MARKING
1.00
0.01
TYP
275
200
ORDER PART
2.2
1.6
1.4
0.9
2.5
1.0
0.5
40
90
40
15
LT3420EMS
LT3420EMS-1
2
0
NUMBER
LTYH
LTAJG
W
1.025
MAX
1.02
1.60
1.05
0.55
130
2.5
1.8
3.5
1.1
16
16
50
25
4
1
UNITS
3420fa
U
mV
mV
mA
mA
ns
ns
V
V
V
V
V
V
A
A
A
A
A
A
V
V