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PDF SC4509 Data sheet ( Hoja de datos )

Número de pieza SC4509
Descripción Highly Integrated Step-Up Converter
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



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No Preview Available ! SC4509 Hoja de datos, Descripción, Manual

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SC4509
Highly Integrated Step-Up Converter for
White LED Applications in MLPD-W8-2x2
Description
The SC4509 is a highly integrated step-up DC/DC convert-
er targeted for white LED backlighting applications. It is
designed to drive up to ve LEDs with a wide input voltage
range of 2.7 to 10 volts. Designed for 20V output voltage,
the SC4509 operates with a constant 1.2MHz PWM fre-
quency. To optimize efciency, the feedback voltage is set
to only 199mV, minimizing the power loss in the current
setting resistor. The product requires only four external
www.DatacSohemept4oUn.ceonmts
applications
(CIN, COUT,
that require
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making
minimal
it ideal for
PCB area.
The SC4509 offers current limit and over-voltage protec-
tion (OVP) to safeguard the device under extreme operat-
ing conditions. If the LEDs become disconnected or fail in
an open state condition, OVP circuitry will be activated to
shut down the device. The EN/SS pin allows the device
to be placed in power-down mode, disabling the control
circuitry to reduce input current.
Features
‹ VIN range: 2.7V — 10V
‹ Integrated Schottky diode
‹ 81% efciency
‹ Requires only 4 external components
‹ Up to 20V of output voltage
‹ 30mA maximum LED current
‹ Open LED protection (OVP)
‹ 1.2MHz PWM switching frequency
‹ Low feedback voltage (20OmV typical)
‹ Wide range of PWM dimming
‹ Drives up to 5 LEDs
‹ 500mA switch current limit
‹ 220nF output capacitor
‹ Available in 2mm x 2mm x 0.75mm MLPD-W8 and
SOT23-6 packages
‹ Packages are fully WEEE and RoHS compliant
Applications
‹ Digital Video Cameras
‹ White LED Backlight Driver
‹ OLED Display Driver
‹ Portable Media Players
‹ GPS Receivers
‹ Cellular Phones
‹ PDAs and Handheld Computers
Typical Application Circuit
Vin L1
22μH
Vo
LED1
EN/SS
C1
1μF
U2
5 VIN
4 EN/SS
SC4509
FB 3
LED2
LED3
C2
0.22μF
LED4
R1
March 26, 2007
1 www.semtech.com

1 page




SC4509 pdf
SC4509
POWER MANAGEMENT
Pin Descriptions
SOT23 MLPD 2X2
1 4, 5
2 2,3
31
www.DataSheet44U.com
5
6
N/A
8
7
6
T
Pin Name Function
VOUT
Cathode side of the Schottky output voltage. Connect a 0.22μF capacitor from this
pin to ground.
GND
Ground connection
FB
EN/SS
Feedback input pin. Connect a resistor from this pin to GND to program the LED
current.
Enable pin. When connected to logic high, the converter is enabled. When con-
nected to logic low, the converter is disabled. The LED brightness can be controlled
by applying a PWM signal to this pin.
VIN Input voltage pin. Connect a 1μF capacitor from this pin to GND.
SW Switching pin - collector of the internal switch.
Exposed pad (bottom); connect to GND directly beneath package.
© 2007 Semtech Corp.
5
www.semtech.com

5 Page





SC4509 arduino
POWER MANAGEMENT
Typical Characteristics (Cont.)
Switch Complementary Duty Cycle vs.
Input Voltage vs. LED Current, VOUT = 16V, (4 LED)
35.0%
30.0%
25.0%
20.0%
ILED = 20mA
15.0%
www.DataSheet4U.com
10.0%
ILED = 30mA
5.0%
0.0%
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3
VIN (V)
Switching Waveform
VIN = 3.6V; ILED = 20mA; VOUT = 16V (4 LEDs)
SC4509
Startup Current
VIN = 3.6V; ILED = 30mA; VOUT = 16V (4 LEDs)
© 2007 Semtech Corp.
11
www.semtech.com

11 Page







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