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  Taiwan Semiconductor (TSMC) Electronic Components Datasheet  

TS19370 Datasheet

Boost (Step-up) WLED Driver

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SOT-26
Pin Definition:
1. SW
6. Input
2. Ground
5. OVP
3. Feedback 4. CTRL
TS19370
Boost (Step-up) WLED Driver with OVP
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.
Package
TS19370CX6 RF 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
www.DataSheet4U.com
1/8 Version: D08


  Taiwan Semiconductor (TSMC) Electronic Components Datasheet  

TS19370 Datasheet

Boost (Step-up) WLED Driver

No Preview Available !

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
oC
oC
Electrical Specifications (Ta = 25oC, VIN= VCTRL=3V, CIN=1uF, COUT=0.22uF unless otherwise noted)
Function Parameter
Symbol
Test Conditions
Min Typ Max
Units
Input Voltage Range
VIN
2.5 -- 18 V
Feedback Voltage
VFB
ISW=100mA, 66% duty
cycle
86 95 104 mV
FB Pin Bias Current
Supply Current
IB
IQ CTRL = 0V
10 45 100 nA
-- 1.9 2.5 mA
-- 0.1 1.0 uA
Switching Frequency
Switch Current Limit
Maximum Duty Cycle
Switch VCESAT
Switch Leakage Current
VCTRL
FRSW
ICL
DTMX
VSAT
ILKG
VCTL
At ISW= 250mA
VSW = 5V
High
Low
0.8 1.2 1.6 MHz
-- 320 -- mA
85 90 -- %
-- 350 -- mV
-- 0.01 5
µA
1.5 -- -- V
-- -- 0.4 V
CTRL Pin Bias Current
Over Voltage Protection
ICTL
OVP
Ctrl = 2V
-- 65 -- µA
-- 30 --
V
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 power
wwdwis.DsiaptaaStihoenet4wUil.lcocmause excessive die temperature. All limits at temperature extremes are guaranteed via correlation
using standard statistical methods
2/8 Version: D08


Part Number TS19370
Description Boost (Step-up) WLED Driver
Maker Taiwan Semiconductor
PDF Download

TS19370 Datasheet PDF





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