ZXSC380FHTA Diodes Inc, ZXSC380FHTA Datasheet

LED Drivers Single or Multi Cell

ZXSC380FHTA

Manufacturer Part Number
ZXSC380FHTA
Description
LED Drivers Single or Multi Cell
Manufacturer
Diodes Inc
Datasheet
1.ZXSC380FHTA.pdf (10 pages)

Specifications of ZXSC380FHTA

Number Of Segments
1
Operating Supply Voltage
0.8 V to 6 V
Maximum Supply Current
20000 uA
Maximum Power Dissipation
450 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOT-23
Minimum Operating Temperature
0 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
ZXSC380
Single or multi cell LED driver solution
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
•
•
•
•
•
•
•
•
Pin connections
Issue 3 - September 2007
© Zetex Semiconductors plc 2007
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
V
V
OUT
CC
1
2
Top view
3
GND
1
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
•
•
•
Typical application circuit
GND
V
LED flashlights and torches
LED backlights
White LED driver
IN
ZXSC380
GND
V
V
CC
OUT
1
3
2
L1
www.zetex.com
SOT23
LED1

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ZXSC380FHTA Summary of contents

Page 1

ZXSC380 Single or multi cell LED driver solution 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 ...

Page 2

Absolute maximum ratings Supply voltage ( Output voltage (V ) OUT Supply current Output switch current Power dissipation SOT23-3 Power dissipation die Operating temperature range Storage temperature range Electrical characteristics Measured 25° 100 ...

Page 3

Typical characteristics LED Current vs Supply Voltage for L = 100uH 0.5 1 1.5 Supply Voltage Vvcc (V) Efficiency vs Supply Voltgae for L = 100uH 100 ...

Page 4

Typical characteristics LED Current vs Supply Voltage for L = 22, 47, 68 & 100uH 1.1 1.2 1.3 Supply Voltage Vvcc ( 100uH L = 68uH ...

Page 5

Device description The ZXSC380 is non-synchronous PFM, DC-DC controller IC which, with a high performance internal transistor, for a high efficiency boost converter for use in single cell applications. A block diagram is shown in Figure ...

Page 6

Application notes Typical application circuit Figure 2 shows a typical boost circuit for 18mA LED current from a single cell 1.5V supply. The inductor value is 100 H. The operating frequency is typically 160kHz typical for 1.5V supply ...

Page 7

Figure 4 Switching frequency vs the supply voltage for various inductor values Bootstrap operation The ZXSC380 can be operated in bootstrap mode, as shown in Figure 5, to operate down to 0.7V typical after the initial successful start up. The ...

Page 8

Issue 3 - September 2007 © Zetex Semiconductors plc 2007 Intentionally left blank 8 ZXSC380 www.zetex.com ...

Page 9

Package outline - SOT23 leads Dim. Millimeters Min. Max 1.12 A1 0.01 0.10 b 0.30 0.50 c 0.085 0.20 D 2.80 3.04 e 0.95 NOM Note: Controlling dimensions are in millimeters. ...

Page 10

Definitions Product change Zetex Semiconductors reserves the right to alter, without notice, specifications, design, price or conditions of supply of any product or service. Customers are solely responsible for obtaining the latest relevant information before placing orders. Applications disclaimer The ...

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