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Zetex Semiconductors
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ZXSC380 Datasheet Preview

ZXSC380 Datasheet

Single or multi cell LED driver solution

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ZXSC380 pdf
ZXSC380
Single or multi cell LED driver solution
www.DataSheet4U.com
Description
The ZXSC380 is a highly integrated single or
multi cell LED driver for applications where
step-up voltage conversion from a very low
input voltage is required. These applications
mainly operate from 1.5V or 1.2V cells. The IC
generates constant current pulses that are
ideal for driving single or multiple LEDs over
a wide range of operating voltages. The
ZXSC380 provides a simple to use, low cost,
space saving and easy to layout solutions.
The ZXSC380 uses a PFM control technique to
drive an internal switching transistor which
has a low saturation resistance. This ensures
high efficiency, even for input voltages as low
as 1V.
Features
• 80% efficiency
• User adjustable output current
• Single cell operation
• Low saturation voltage switching transistor
• Simple application circuit
• Low external component count
• SOT23 package
• Available also in die form
Pin connections
The IC can start up under full load and operates
down to an input voltage of only 0.9V typical.
The ZXSC380 is offered in the space saving
SOT23 package or in die form, offering an
excellent cost vs performance solution for
single cell LED driving applications.
Applications
• LED flashlights and torches
• LED backlights
• White LED driver
SOT23
Typical application circuit
VCC 1
3 VOUT
GND 2
Top view
VIN
L1
ZXSC380
1
Vcc
Vout 3
GND
2
GND
LED1
Issue 1 - March 2007
© Zetex Semiconductors plc 2007
1
www.zetex.com



Zetex Semiconductors
Zetex Semiconductors

ZXSC380 Datasheet Preview

ZXSC380 Datasheet

Single or multi cell LED driver solution

No Preview Available !

ZXSC380 pdf
ZXSC380
Absolute maximum ratings
Supply voltage (VCC)
Output voltage (VOUT)
Supply current
Output switch current
Power dissipation SOT23-3
Power dissipation die
Operating temperature range
Storage temperature range
-0.6V to 10V
-0.6V to 20V
20mA
200mA
450mW
1W
0°C to +85°C
-55°C to +150°C
Electrical characteristics
Measured at Tamb = 25°C, L = 100H and VCC = 1.5V unless otherwise specified.
Parameter
Supply voltage operating range
Minimum supply start-up voltage
Switch current
Switch saturation voltage
Mean LED current
Efficiency
Operating frequency
Discharge pulse width
Conditions
VOUT = 1.0V
IVOUT = 50mA
VLED = 3.5V
VLED = 3.5V
VLED = 3.5V
Min.
0.8
65
1.4
Limits
Typ.
0.9
80
0.3
18
75
160
2.2
Max.
6
1.0
95
0.5
3.0
Units
V
V
mA
V
mA
%
kHz
s
Pin descriptions
VCC 1
3 VOUT
GND 2
Top view
Pin descriptions
Pin No.
1
2
3
Name
VCC
GND
VOUT
Description
Supply voltage, generally Alkaline, NiMH or NiCd single cell
Ground
Switch output external inductor/LED
Ordering information
Device
ZXSC380FH
Package
SOT23
Part Mark
380
Issue 1 - March 2007
© Zetex Semiconductors plc 2007
2
www.zetex.com


Part Number ZXSC380
Description Single or multi cell LED driver solution
Maker Zetex Semiconductors
Total Page 10 Pages
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ZXSC380 pdf
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