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LD7270 데이터시트 PDF




Leadtrend에서 제조한 전자 부품 LD7270은 전자 산업 및 응용 분야에서
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부품번호 LD7270 기능
기능 Smart Photoflash Capacitor Charger
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LD7270 데이터시트, 핀배열, 회로
LD7270
6/18/2010
Smart Photoflash Capacitor Charger with Integrated MOS
REV03
General Description
The LD7270 is an ideal charge control IC for flash units,
featuring internal soft start, adjustable charging current
and output voltage. It provides a charging algorithm to
speed up the charging with higher efficiency. The LD7270
can operate in desired constant peak current mode
through adjusting RI between ISET pin and GND. As well,
LD7270 uses separate source and sink pin of IGBT driver,
which enables the users to easily meet different IGBT
application requirements.
The LD7270 is available in a space-saving WDFN-10L
3x3 package and is ideal for DSC flash unit.
g Patented
Features
1.8V~6V Battery Voltage Range
Adjustable Output Voltage
Adjustable Input Current
Integrated 47V Power MOS
Separate Source and Sink Pin of IGBT Driver
False Triggering Prevention
Soft Start
Output Voltage Overcharge Protection
High Efficiency
Applications
DSC Flash Unit
Cell Phone with Camera
Typical Application
RI
=
40000
IPK -PRI
(Ω)
Fig.1
Leadtrend Technology Corporation
LD7270-DS-03, June 2010
1
www.leadtrend.com.tw




LD7270 pdf, 반도체, 판매, 대치품
Pin Configuration
WDFN-10 (3mm x 3mm)
10 9 8 7 6
7 270DH
YYWWPPT
1 23 4 5
YY: Year code
WW: Week code
PP: Production code
T: Thickness
W: 0.75mm (typical)
LD7270
Ordering Information
Part number
Package
Top Mark
Shipping
LD7270GDHW
WDFN-10L 3mm x 3mm
The LD7270 is ROHS compliant.
7270DH
2500 /tape & reel
Pin Descriptions
PIN NAME
1 FB
2 DONE#
3
4
5
6
7
8
9
10
Exposed
Metal Pad
TRIGGER
OUTP
OUTN
LX
VCC
VBAT
CHARGE
ISET
GND
FUNCTION
Output voltage feedback
Charge Done Indicator. DONE# is an open drain output that pulls low
when CHARGE is high and the circuit has finished charging the output
capacitor.
Trigger on/off control.
IGBT driver source output pin.
IGBT driver sink output pin.
NMOS drain pin. Connect to transformer primary as shown in Fig.1.
Input power of IC. Bypass with a 1μF ceramic capacitor close to IC GND.
Battery Voltage Input
Charging on/off control.
Input current setting pin.
IC GND. Exposed pad should be soldered to PCB board with a larger area
Leadtrend Technology Corporation
LD7270-DS-03, June 2010
4
www.leadtrend.com.tw

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LD7270 전자부품, 판매, 대치품
PARAMETER
Others
Thermal Shutdown
Max ON Time
Propagation Delay
LD7270
CONDITIONS
MIN TYP MAX UNITS
(Trigger=High) delay to
OUTP and OUTN
150
30
60
°C
μs
ns
Typical Performance Characteristics
Do ne#
VO UT
VB A T
IIN
Done #
VB AT
VOUT
IIN
Fig. 5 Charging Waveform VBAT=3V
Do ne#
Charg e
IIN
VOUT
Fig. 7 Soft Start Function
Fig. 6 Charging Wavef orm VBAT=4.2V
VO UT
VLX
IPK- PR I
Fig. 8 Typical Swit ching Waveform
Leadtrend Technology Corporation
LD7270-DS-03, June 2010
7
www.leadtrend.com.tw

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