A8437
Mobile Phone Xenon Photoflash Capacitor Charger
with IGBT Driver
CG Package
A1 A2 A3 A4
B1 B2 B3 B4
C1 C2 C3 C4
Orientation mark
on ball side
Pin-out Diagrams
(Contacts Down Views)
EJ Package
ISET 1
10 REG
GATE 2
VIN 3
EP
9 DONE
8 TRIGGER1
GND 4
7 SW
CHARGE 5
6 TRIGGER2
Terminal List Table
Name
Number
CG EJ
ISET
C4
1
GATE
–
2
GSOURCE B3
–
GSINK
C3
–
VIN
C2
3
GND
C1
4
CHARGE
B1
5
TRIGGER2 B2
6
SW
A1
7
TRIGGER1 A2
8
¯D¯ ¯O¯ ¯N¯ ¯E¯
A3
9
TLIM
A4
–
REG
B4
10
EP
n.a.
–
Function
Sets the maximum switch current; connect an external resistor to GND to set the
desired peak current
IGBT gate drive – sink/source
IGBT gate drive – source
IGBT gate drive – sink
Input voltage; connect to a 2.3 to 5.5 V bias supply
Ground connection
Pull high to initiate charging; pull low to enter low-power standby mode
IGBT input trigger 2
Drain connection of internal power MOSFET switch; connect to transformer
IGBT input trigger 1
Pulls low when output reaches target value and CHARGE pin is high; goes high dur-
ing charging or whenever CHARGE pin is low
For production test only; connect to GND on PCB
Output voltage regulation pin; connect to external resistor and capacitor to regulate
output voltage, or connect to VIN pin to disable regulation (see Output Regulation
section for details)
Exposed pad for enhanced thermal dissipation; not connected electrically
Allegro MicroSystems, Inc.
4
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com