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LD7266A Datasheet Preview

LD7266A Datasheet

Photoflash Capacitor Charger

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LD7266A pdf
LD7266A
3/1/2007
Photoflash Capacitor Charger with Integrated MOS
REV: 00
General Description
The LD7266A is an ideal charge control IC for flash units
with internal soft start, adjustable charging current and
output voltage. It provides a proprietary charging algorithm
to charge photoflash capacitor quickly and efficiently. The
LD7266A could operate in constant charging current mode
or the mode with lowering the charging current at lower
battery voltage. As well, the built-in 45V power switch and
IGBT driver can save the board space.
The LD7266A is available in a space-saving MSOP10 or
DFN-10 package and is ideal for DSC flash unit.
Features
Adjustable Charging Current and Output Voltage
1.8V~5V Battery Voltage Range
Tiny Transformer
Totem-Pole IGBT Driver
Integrated 45V power switch
Output Voltage Overcharge Protection
Applications
DSC Flash Unit
Cell Phone with Camera
g Patented
Typical Application
D1
T1
C2
140µF
R1
196K
VCC
1µF
VDD
R2
196K
R1
100K
Ready
R3
1.5K
IGBT Gate
RG
FB
SEC
1nF
VCC
LD7266A
LX
ISET
READ Y
CHARGE
OUT
GND
TRIGGER
1nF
Charge
Trigger
C1
22µF
VB AT
Ri/360K
Fig.1
Leadtrend Technology Corporation
LD7266A-DS-00 March 2007
1



Leadtrend
Leadtrend

LD7266A Datasheet Preview

LD7266A Datasheet

Photoflash Capacitor Charger

No Preview Available !

LD7266A pdf
Pin Configuration
MSOP-10 (TOP VIEW)
10 9 8 7 6
TOP MARK
YYWWPP
12345
LD7266A
DFN-10 (TOP VIEW)
10 9 8 7 6
TOP MARK
YYWWPP
1 23 4 5
YY: Year code
WW: Week code
PP: Production code
Ordering Information
Part number
LD7266APL
LD7266AGL
Package
MSOP-10
MSOP-10
(Green Package)
Top Mark
7266APL
7266AGL
Shipping
2500 /tape & reel
2500 /tape & reel
LD7266APE
DFN-10
7266APE
2500 /tape & reel
LD7266AGE
DFN-10
(Green Package)
The LD7266A is ROHS complaint.
Pin Descriptions
7266AGE
2500 /tape & reel
PIN NAME
FUNCTION
1 FB Output voltage feedback
2 CHARGE Charging on/off control pin. High=enable low=disable
3 TRIGGER Trigger on/off control pin. High=enable low=disable
4
SEC
Secondary current sensing. Connect to transformer secondary.
5
GND
IC GND.
6 LX NMOS drain pin. Connect to transformer primary as shown in Fig.1
7
OUT
IGBT driver output Pin.
8
VCC
Input power of IC. Bypass with a 1µF ceramic capacitor.
9
READY
Charge ready open drain output.
10
ISET
Adjust charging current with R to VBAT.
Exposed Metal Pad. Exposed pad should be soldered to PCB board and
- EP connected to power ground plane to achieve better thermal dissipation.
(for DFN-10 package)
Leadtrend Technology Corporation
LD7266A-DS-00 March 2007
2


Part Number LD7266A
Description Photoflash Capacitor Charger
Maker Leadtrend
Total Page 14 Pages
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