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ZXSC310E5TA

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
DEVICE DESCRIPTION
The ZXSC310 is a single or multi cell LED driver
designed for LCD backlighting applications. The input
voltage range of the device is between 0.8V and 8V.
This means the ZXSC310 is compatible with single
NiMH, NiCd or Alkaline cells, as well as multi-cell or
LiIon batteries.
The device features a shutdown control, resulting in a
standby current less than 5µA, and an output capable
of driving serial or parallel LED’s. The circuit generates
constant power output, which are ideal for driving
single or multiple LED’s over a wide range of operating
voltages. These features make the device ideal for
driving LED’s particularly in LCD backlight applications
for Digital Still cameras and PDA’s.
FEATURES
• 94% efficiency
• Minimum operating input voltage 0.8V
• Maximum operating input voltage 8V
• Standby current less than 5µA
• Programmable output current
• Series or parallel LED configuration
• Low saturation voltage switching transistor
•
SOT23-5 package
APPLICATIONS
•
LCD backlights:
Digital still camera
PDA
Mobile phone
•
LED flashlights and torches
•
White LED driving
•
Multiple LED driving
The ZXSC310 is a PFM DC-DC controller IC that drives
an external Zetex switching transistor with a very low
saturation resistance. These transistors are the best
switching devices available for this type of conversion
enabling high efficiency conversion with low input
voltages. The drive output of the ZXSC310 LED driver
generates a dynamic drive signal for the switching
transistor.
The circuit can start up under full load and operates
down to an input voltage of 0.8 volts. The solution
configuration ensures optimum efficiency over a wider
range of load currents; several circuit configurations
are possible depending on battery life versus
brightness considerations.
The ZXSC310 is offered in the SOT23-5 package which,
when combined with a SOT23 switching transistor,
generates a high efficiency small size circuit solution.
The IC and discrete combination offers the ultimate
cost Vs performance solution for LED backlight
applications.
ZXSC310
ISSUE 3 - SEPTEMBER 2007
1
SEMICONDUCTORS
LED DRIVER SOLUTION FOR LCD BACKLIGHTING
V
IN
V
CC
V
=3.3V/5V
DRIVE
I
SENSE
Gnd
S
TDN
TYPICAL APPLICATIONS CIRCUIT
DEVICE REEL
SIZE
TAPE
WIDTH
QUANTITY
PER REEL
ZXSC310E5TA 180mm 8mm 3000
ORDERING INFORMATION
DEVICE MARKINGS
•
C310
Package SOT23-5
ABSOLUTE MAXIMUM RATINGS:
Supply Voltage -0.3 to 10V
Maximum Voltage other pins -0.3 to V
CC
+0.3V
Power Dissipation 450mW
Operating Temperature -40 to 85 °C
Storage Temperature -55 to 150°C
SEMICONDUCTORS
ZXSC310
ISSUE 3 - SEPTEMBER 2007
2
Symbol Parameter Conditions Min Typ Max Units
␩ Efficiency
(1)
94 %
V
CC
Recommended supply
voltage range
0.8 8 V
V
CC(min)
Minimum startup and
operating voltage
I
DRIVE
=-600µA
,
V
DRIVE
=0.7V
I
DRIVE
=-600µA, V
DRIVE
=0.7V,
T
AMB
=-10°C
(3)
0.8
0.9
0.92 V
I
Q
Quiescent current
(2)
V
EN =
V
CC
(enabled)
V
EN =
0V (standby)
0.2
510
mA
µA
I
VDRIVE
Base drive current V
DRIVE
=0.7V,V
ISENSE
=0V 1.5 3.5 mA
I
CC
Supply current
(3)
V
DRIVE
=0.7V,V
ISENSE
=0V 2 4 mA
V
VDRIVE(high)
High level drive voltage V
ISENSE
=0V,I
VDRIVE
=-0.5mA V
CC
-0.3
V
CC
V
V
VDRIVE(low)
Low level drive voltage V
ISENSE
= 50mV, I
VDRIVE
=5mA 0 0.2 V
V
STDN(high)
Device enabled 0.7 V
V
STDN(low)
Device in standby mode 0.15 V
I
STDN
Enable input current -1 1 µA
V
ISENSE
(threshold)
Output current reference
voltage
14 19 24 mV
T
CVISENSE
I
SENSE
voltage temp co.
(2)
0.4 %/°C
I
ISENSE
I
SENSE
input current V
ISENSE
=0V 0 -30 -65 µA
T
DRV
Discharge Pulse Width 1.2 1.7 3.2 µs
ELECTRICAL CHARACTERISTICS:
Test conditions unless otherwise stated: V
CC
=1.5V, T
AMB
=25 C
Symbol
Parameter Conditions Min Typ Max Units
F
OSC
Recommended operating
frequency
(4)
200 kHz
OPERATING CONDITIONS
(1) Application dependent, see reference designs
(2) These parameters guaranteed by Design and characteristics
(3) Total supply current =I
Q
+I
VDRIVE
, see typical characteristics
(4) Operating frequency is application circuit dependent. See applications section.
FMMT618
For the circuits described in the applications section
Zetex FMMT618 is the recommended pass transistor.
ZHCS1000
For the maximum brightness circuit described in the
applications section Zetex ZHCS1000 is the
recommended Schottky diode.
The following indicates outline data for the device,
more detailed information can be found at
www.zetex.com/fmmt618
The following indicates outline data for the ZHCS, more
detailed information can be found at
www.zetex.com/zhcs1000
ZXSC310
ISSUE 3 - SEPTEMBER 2007
SEMICONDUCTORS
3
Symbol Parameter Conditions Min Typ Max Units
V
CE(sat)
Collector-Emitter
Saturation Voltage
5
I
C
=0.1A, I
B
=10mA
I
C
=1A, I
B
=10mA
I
C
=2.5A, I
B
=50mA
8
70
130
15
150
200
mV
V
(BR)CEO
Collector-Emitter
Breakdown Voltage
5
I
C
=10mA 20 27 V
ELECTRICAL CHARACTERISTICS:
Test conditions unless otherwise stated: T
AMB
=25 C
5
Measured under pulse conditions. Pulse width=300µs. Duty cycle ⱕ2%
Symbol Parameter Conditions Min Typ Max Units
V
F
Forward voltage I
F
= 500mA
I
F
=1A
400
500
mV
t
rr
Reverse Recovery Time Switched from I
F
=500mA to
I
R
=500mA.
Measured at I
R
=50mA
12 ns
I
R
Reverse Current V
R
= 30V 50 100 µA
ELECTRICAL CHARACTERISTICS:
Test conditions unless otherwise stated: T
AMB
=25 C
Part
Number
V
R
I
F
I
FSM
V
F
at I
R
at Capacitance
at V
R
=25V,f=1MHz
Package
Max.
V
Max.
mA
Max.
A
Max.
mV
I
F
mA
Max.
␮A
V
R
V
Typ.
pF
SOT23
BAT54 30 200 0.6 500 30 250 25 10 SOT23-6
ZHCS2000 40 2000 20 500 2000 1000 30 60 SOT23
ZHCS1000 40 1000 12 500 1000 100 30 25 SOT23
ZHCS750 40 750 12 540 750 100 30 25 SOT23
ZHCS500 40 500 6.75 550 500 40 30 20 SOT23
ZHCS400 40 400 6.75 500 400 40 30 20 SOT323
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

ZXSC310E5TA

Mfr. #:
Buy ZXSC310E5TA
Manufacturer:
Diodes Incorporated
Description:
LED Lighting Drivers LED Drvr w/shutdown
Lifecycle:
New from this manufacturer.
Delivery:
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