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YB1519
High-Power White LED Driver
Description
The YB1519 is a high-power boost
converter. An adjustable current limit, wide
range of input voltage, and up to 40V of
switch voltage are designed to drive white
LEDs back-lighting for large LCD panel. It
can drive up to 10 LEDs in series or 18
LEDs in parallel/series configuration.
The wide application VIN range makes
YB1519 suitable for many types of battery
applications such as Li-ions, Alkaline, or
Sealed Lead Acid batteries. The adjustable
inductor current optimizes the performance
for different output drive capability by an
external resistor.
The LED current is set by a resistor
connected to FB pin. The On/Of duty with
clock frequency from 1K to 100KHz at EN
pin can control the LED brightness
Typical Application Circuit
Features
„ 2V to 16V Input Voltage
„ 40V Maximum Output Voltage
„ Drive up to 18 White LEDs
„ Adjustable Inductor Current
„ 1μs Constant Off-time PFM Control
„ 1KHz to 100KHz PWM Dimming Control
Applications
„ High Power WLED Backlight Solution
„ LCD Monitor
„ LCD TV
„ Car TV, Portable DVD
„ GPS navigation system
„ Handheld Game
VIN = 6 to14V
EN
Bypass
Iset
10uF
16V
VIN
YB 1519
22uH
SL12
LX
LX
FB
43.75uVF
BZV55-B 36
36V
2K
10nF
6.3V
10K
AGND
PGND
Figure 1. Typical application circuit
RFB
60OHM
YB1519 MRev.1.2
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Pin Configuration
YB1519
High-Power White LED Driver
YB 1519
PGND 1
AGND 2
VIN 3
Bypass 4
FB 5
GND
10 LX
9 LX
8 Iset
7 NC
6 EN
MSOP10
Figure 2. Pin configuration
Pin Description
Table 1
Pin Name
Description
1 PGND Power ground, tie solidly to system ground of the board.
2 AGND Analog ground, tie solidly to system ground of the board.
3 VIN Input supply pin. Must be locally bypassed with a capacitor to eliminate noise.
4 Bypass Internal compensation usage. A 10nF bypass capacitor is recommended.
5 FB Feedback input pin.
6 EN Enable control pin. Active high.
7 NC No connection.
8 Iset Tie a resistor to ground to set inductor current.
9 LX Switch pin, connect to external inductor.
10 LX Switch pin, connect to external inductor.
Ordering Information
Order Number
YB1519
Package Type
MSOP-10
Supplied as
2500 Units Tape & Reel
Package Marking
YB1519
YB1519 MRev.1.2
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YB1519
High-Power White LED Driver
Absolute Maximum Ratings
Supply Voltage......................................... -0.3V to 16V
LX Switch Voltage.................................... -0.3V to 40V
Junction Temperature Range........................... +150
Storage Temperature Range ............. -65to +150
Lead Temperature............................................ +250
Recommended Operating
Conditions
Input Supply Voltage.............................. 2.2V to 16V
Operating Temperature..................... -40to +85
Electrical Characteristics
At TA=25, VIN=6V, unless otherwise noted.
Table 2
Function Parameter
Conditions
Min Typ Max Units
Input Voltage Range
2.2 16 V
VFB Threshold Voltage
VFB Pin Bias Current
VFB=1.23V
Quiescent Current
VFB=1.5V, not switching
Quiescent Current in shutdown VEN=0V
Switching Off Time
1.21 1.23 1.25
180 250
400
10
1
V
nA
μA
μA
μs
Switching On VCE,SAT
LX Leakage Current
EN Logic Low Level
ISWITCH=300mA
VFB=1.5V, VLX=40V
EN pin voltage low
220 330
1 10
0.4
mV
μA
V
EN Logic High Level
EN pin voltage high
1.8 VIN V
EN Input Bias Current
EN Input Bias Current
ISET Source Current
Inductor Peak Current
VEN=3V
4.5 15
μA
VEN=0V
1 μA
6 8 10 μA
Rlimit=15K, Vin=12V, Vout=30V, Iout =
1.4 1.5 1.6
150mA
A
YB1519 MRev.1.2
www.yobon.com.tw
3