Document
TS19370
Boost (Step-up) WLED Driver with OVP
SOT-26
Pin Definition: 1. SW 6. Input 2. Ground 5. OVP 3. Feedback 4. CTRL
General Description
The TS19370 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive 2 ~ 9 LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The output capacitor can be as small as 0.22µF, saving space versus alternative solutions. A low 95mV feedback voltage minimizes power loss for better efficiency. Additional feature include over output voltage limiting when LEDs are disconnected. The TS19370 switches at a fixed frequency of 1.2MHz, 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.
Features
● ● ● ● ● ● ● ● ● Inherently Matched LED Current High Efficiency: 88% Typical Drives Up to 6 LEDs @ Vin 5V Drives Up to 9 LEDs @ Vin 9~15V Over Output Voltage Protection 30V Fast 1.2MHz Switching Frequency Requires Only 0.22µF Output Capacitor PWM dimming control 1KHz to 10KHz Analog dimming control
Ordering Information
Part No.
TS19370CX6 RF
Package
SOT-26
Packing
3Kpcs / 7” Reel
Input Voltage vs. Efficiency
Application
● ● ● ● Cellular Phones Portable Electronics Devices PDA, GPS LCD Display Module White LED Backlighting
Typical Application Circuit
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Version: D08
TS19370
Boost (Step-up) WLED Driver with OVP
Absolute Maximum Rating
Parameter
Input Voltage Supply Voltage (Recommended) FB Voltage SW Voltage CTRL Voltage Ambient Temperature Range Junction Temperature Range
Symbol
VIN VIN VFB VSW VCTRL TA TJ
Limit
20 2.5 ~ 18 10 36 10 -40 to +85 -40 to +125
Unit
V V V V V
o o
C C
Electrical Specifications (Ta = 25oC, VIN= VCTRL=3V, CIN=1uF, COUT=0.22uF unless otherwise noted)
Function Parameter
Input Voltage Range Feedback Voltage FB Pin Bias Current Supply Current Switching Frequency Switch Current Limit Maximum Duty Cycle Switch VCESAT Switch Leakage Current
Symbol
VIN VFB IB IQ FRSW ICL DTMX VSAT ILKG VCTL ICTL OVP
Test Conditions
ISW=100mA, 66% duty cycle
Min
2.5 86 10 --
Typ
-95 45 1.9 0.1 1.2 320 90 350 0.01 --65 30
Max
18 104 100 2.5 1.0 1.6 ---5 -0.4 ---
Units
V mV nA mA uA MHz mA % mV µA V V µA V
CTRL = 0V
-0.8 -85
At ISW= 250mA VSW = 5V High Low Ctrl = 2V
--1.5 ----
VCTRL
CTRL Pin Bias Current Over Voltage Protection
Thermal Resistance θJA -220 -°C/W Note: Absolute maximum ratings are limits beyond which damage to the device may occur. The maximum allowable power dissipation is a function of maximum function temperature, TJ(max), the junction to ambient thermal resistance, θ JA , and the ambient temperature. The maximum allowable, power dissipation at any ambient temperature is calculated using: PD(MAX)= [TJ(max)-TA]/θJA . Exceeding the maximum allowable .