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YB1303
Low Dropout LED Driver
Description
The YB1303 provides a simple solution for
driving three channels of any color LEDs
with current matching ability. The ultra low
dropout LED driver features higher peak
efficiency and very low shutdown current.
The LED current can be adjusted by an
external resistor or the control voltage. The
YB1303 can work independently or
combine with any boost converters which
need to have current matching function for
LED drivers. The YB1303 is available in
6-pin tiny SC70-6 package.
Features
„ LED Drivers for Parallel Connected
LEDs
„ Only One External Resistor is Needed
„ PWM and Analog Brightness Control
„ No EMI and Switching Noise
„ Power Saving Shutdown Mode (<0.1μA)
„ Small Footprint SC70-6 Package
Applications
„ LCD Display Modules
„ Keyboard Backlight
„ PDA, DSC, MP3 players
„ LED Displays
„ Handheld Computers
„ Cell Phones
Typical Application Circuit
YB1303 Rev.1.0
Figure 1: Typical Application Circuit
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Pin Configuration
YB1303
Low Dropout LED Driver
CTR 1
LED2 2
LED1 3
6 EN
5 LED3
4 GND
SC70-6
Figure 2: Pin Configuration
Pin Assignment &Description
Table 1
Pin
Name
Description
1 CTR Connect this pin with a resistor to set the LED current.
2 LED2 Connect this pin to LED cathode.
3 LED1 Connect this pin to LED cathode.
4 GND Ground pin.
5 LED3 Connect this pin to LED cathode.
6
EN
Connect this pin to logic high to enable this chip, logic low to
disable this chip.
Ordering Information
Table 2
Order Number
Package Type
YB1303SC76A
SC70-6
Supplied As
3000 Units Tape & Reel
Package Marking
Please contact sales
representative
YB1303 Rev.1.0
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YB1303
Low Dropout LED Driver
Absolute Maximum Ratings
Recommended Operating Conditions
LED1, LED2, LED3 to GND ........ -0.3V to 6V
EN to GND.................................. -0.3V to 6V
CTR to GND ............................... -0.3V to 3V
Power Dissipation by SC70-6 TA=85........133mW
Junction Temperature Range...............150
Storage Temperature Range .....-55to 150
Lead Temperature................................250
ESD HBM .......................................... 1.5KV
ESD CDM ...........................................750V
LED Cathode Voltage ................. 0.3V to1V
Operating Temperature.........-40to 85
Electrical Characteristics
Table 3 (VIN=3.3 to 5.5V, VEN=3V, TA=25°C, unless otherwise noted. VF is LED forward voltage.)
Description
Symbol
Test Conditions
MIN TYP MAX Units
LED Cathode Voltage
VCATHODE
0.3 0.5
1
V
Output Current Multiplication
Factor
Shutdown Current
LED Current
LED to LED Current Matching
ISET = 100μA,
VLED = 300mV
ISD VEN = 0V
ILED ISET = 100μA
140 200 260
0.1 1 μA
20 mA
-3 +3 %
Efficiency
η
VIN =3.3V,
(VIN – VCATHODE) / VIN
90 %
SHDN Logic Low Level
SHDN Logic High Level
VIL ILED < 1μA
VIH ISET = 100μA
0.5 V
3V
YB1303 Rev.1.0
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YB1303
Low Dropout LED Driver
Typical Performance Characteristics
VIN=3.3 to 5.5V, VEN=3V, TA=25°C, unless otherwise noted. VF is LED forward voltage.
Iset vs. Control Voltage
(RSET=17.4k, Vcathode=0.3V)
160
140
120
100
80
60
40
20
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
Vcontrol (V)
LED Current vs. LED Cathode Voltage
(Vcontrol=3V, VEN=3V)
22
20
Rset=17.4k
18 Iset=100uA
16
14
12
10
8
6
4
2
0
0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.20
Cathode Voltage (V)
22
20
18
16
14
12
10
8
6
4
2
0
0
LED Current vs. Enable Voltage
(Vcontrol=3V, Vcathode=0.3V, Rset=17.4k)
12345
VEN Voltage (V)
6
LED Current vs. Rset
(VEN=3V, Vcontrol=3V)
45
40
35
30
Vcathode=0.3
25 Vcathode=0.5
20 Vcathode=1
15
10
5
0
0 10 20 30 40 50 60 70 80
Rset (kOhms)
Control Voltage Transient Response
Enable Voltage Transient Response
YB1303 Rev.1.0
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YB1303
Low Dropout LED Driver
Application Information
Analog Dimming Control Table
Table 4
VEN=3V, VCONTROL=3V
ILED (mA)
RSET (kΩ)
5 75
10 34
15 24
20 17.4
25 13
voltage. The lower the VLED voltage, the
higher the system efficiency. The system
efficiency can be calculated as follows:
Efficiency = (VIN-VCATHODE) / VIN
Thermal Considerations
At any given ambient temperature, the
maximum package power dissipation can
be determined by the following equation:
Table 5
VEN=3V, RSET=17.4k
ILED (mA)
VCONTROL (V)
5 1.5
10 2.1
15 2.5
20 3
25 3.6
PD(MAX) = [TJ(MAX)-TA] / θJA
Constraints for the YB1303 are maximum
junction temperature TJ(MAX)=125 , and
package thermal resistance, θJA=300/W.
The maximum total LED current for
YB1303 depends on package power
Setting the LED Current
The LED current can be set by the control
voltage and the RSET resistor from the
following equation.
ILED=200×(VCONTROL-VCTR)/RSET
The suggested values and relations
between VCONTROL and RSET can also be
found in the diagram of typical
characteristics and table 4 and table5. The
LED brightness can be controlled by either
the above equation or applying a PWM
signal to the EN pin. The driving signal
dissipation and the LED cathode voltage at
TJ(MAX). At 85, PD(MAX)=133mW. At TA =
25, PD(MAX)=333mW.
The maximum current is calculated by the
following equation:
ILED < (PD(MAX) / VLED(MAX))
For example, if ILED = 60mA, and TA = 85,
VLED(MAX) = 2.2V.
If the ambient temperature were to
increase, the internal die temperature
would increase, and the device would be
damaged.
frequency should be greater than 100Hz to
avoid flickering, and increased to more
than 1MHz if necessary.
Efficiency Considerations
Application Examples
The ultra-low voltage drop across the
YB1303 allows the devices to drive white,
blue and any color LEDs in a wide range of
The YB1303 featured low drop out can
achieve excellent efficiency performance.
input voltages. The driver can be used in
many applications presented in this
The efficiency is mainly dominated by VLED document, due to their similar operation.
YB1303 Rev.1.0
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