LT3420EMS-1 Linear Technology, LT3420EMS-1 Datasheet - Page 7

• Manufacturer Part Number: LT3420EMS-1
• Description: IC PHOTOFLASH CHARGER CAP 10MSOP
• Manufacturer: Linear Technology

Specifications of LT3420EMS-1

• Applications: Photoflash Capacitor Charger
• Current - Supply: 90µA
• Voltage - Supply: 2.2 V ~ 16 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

BLOCK DIAGRA S
CHARGE
CHARGE
V
V
CC
C3
C2
CC
C2
C3
CT
CT
10
10
9
4
9
4
V
V
CC
CC
REFRESH
SHOT
ONE-
REFRESH
SHOT
ONE-
TIMER
TIMER
Q
S
Q
S
CHIP
ENABLE
CHIP
ENABLE
MASTER
MASTER
LATCH
LATCH
V
V
W
BAT
BAT
Q
R
Q
R
DONE
DONE
BLOCK
ENABLE
8
BLOCK
ENABLE
8
Q5
Q5
C1
C1
A3
A3
2
Figure 4. Block Diagram, LT3420-1
2
Figure 3. Block Diagram, LT3420
V
V
D3
D3
BAT
BAT
–
+
–
+
3
3
Q3
Q3
R
R
FB
FB
Q2
Q2
REFERENCE
REFERENCE
1
1
R
R
REF
1V
REF
1V
R2
R2
SHOT
ONE-
SHOT
ONE-
POWER DELIVERY BLOCK
POWER DELIVERY BLOCK
Q4
Q4
R
R
S
S
Q
Q
R1
R1
DRIVER
DRIVER
A1
A2
A1
A2
–
–
+
+
–
+
+
–
20mV
10mV
20mV
10mV
+ –
+ –
+ –
+ –
LT3420/LT3420-1
6
6
Q1
Q1
SW
SW
0.02Ω
0.66Ω
0.014Ω
0.25Ω
LT3420-1
PRIMARY
PRIMARY
LT3420
5
7
5
7
GND
SEC
3420 F04
GND
SEC
3420 F03
1:10
1:12
T1
T1
SECONDARY
PHOTOFLASH
SECONDARY
PHOTOFLASH
CAPACITOR
CAPACITOR
D1
D1
C4
C4
+
+
3420fb
7
V
V
OUT
OUT