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LT3420EMS Datasheet(PDF) 2 Page - Linear Technology

Part # LT3420EMS
Description  Photoflash Capacitor Chargers with Automatic Refresh
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3420EMS Datasheet(HTML) 2 Page - Linear Technology

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