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Part NameDescriptionManufacturer
YB1522ST25 Step-up DC-DC Converter White LED Driver YOBON
YB1522ST25 Datasheet PDF : 12 Pages
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Step-up DC-DC Converter White LED Driver
The YB1522 is a step-up DC-DC converter;
with wide input voltage range from 3V to
16V, which operates as current source to
drive up to 3S7P to 3S10P (VIN at 3V to
5V). Series connecting of the LEDs
provides identical LED currents resulting in
uniform brightness and eliminating the
need for ballast resistors. The light intensity
of these LEDs is proportional to the current
passing through them. The YB1522
switches at a fixed frequency of ~930KHz,
allowing the use of tiny, low profile
inductors and capacitors to minimize
footprint and cost in space consideration
The YB1522 can drive up to 3S10P white
LEDs from a single Li-Ion battery. At
automotive (5V/12V) applications with
higher conversion efficiency. To control
LED brightness, the LED current can be
pulsed by applying a PWM (pulse width
modulated) signal with a frequency range
of 100Hz to 1KHz to the CTRL pin.
YB1522 has integrated Latched Over
Voltage Protection that prevents damage to
the device in case of a high impedance
output due to faulty LED or open circuit
caused by abnormal conditions.
„ Built-in Internal Switch
„ 3V to 16V Input Range
„ <1uA Shutdown Current
„ High Efficiency
„ Internal Soft Start
„ Drives up to 3S7P to 3S10P White
LEDs(VIN at 3.5V to 5V)
„ Over Voltage Protection 30V
„ Small 5-Lead SOT-23 Package
„ Analog and PWM Dimming Control
„ 100mV Low Reference Voltage
„ 5” ~ 7” LCD Display Module
„ White LED Backlighting
„ Car TV
„ Handheld and PDA
„ Electronic Books
„ Digital Photo Frame
Typical Application Circuit
Figure 1: Typical Application Circuit
YB1522 Rev.1.0
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