TS1520 Datasheet, PDF (1/12 Pages) Taiwan Semiconductor Company, Ltd – Step-Up DC-DC Converter, White LED Driver

TS1520
Step-Up DC-DC Converter, White LED Driver
SOT-25
Pin Definition:
1. SW
2. Ground
3. Feedback
4. CTRL
5. Input
General Description
The TS1520 is a step-up DC-DC converter; operates as current source to drive up to 18 white LEDs in parallel/series
configuration. 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 TS1520 switches at a fixed frequency of 700KHz, allowing the use of tiny, low profile inductors and
capacitors to minimize footprint and cost in space consideration applications for cellular phone backlighting or other
hand held equipment. The TS1520 can drive up to 18 white LEDs form 4.5V supply. The wide input voltage range
from 2.7V to7V is ideal for portable (5V) 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
50KHz to the CTRL pin. TS1520 has integrated 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.
Features
● Built-in Internal Switch
● 2.7V to 7V input range
● <1uA shutdown current
● High Efficiency
● Drives up to 3S2P to 3S6P White LEDs
(V_IN at 3.5V to 5V)
● Over Voltage Protection 30V
Application
● Cellular Phones
● Digital Still Cameras
● Portable Electronics
● LCD Display Module
● White LED Backlighting
● PDAs, GPS terminals
Ordering Information
Typical Application Circuit
Part No.
TS1520CX5 RF
Package
SOT-25
Packing
3Kpcs / 7” Reel
1/12
Version: B07