TS19371CX6 RFG Datasheet TS19371CX6 RFG | P1-P3

TS19371CX6

Taiwan Semiconductor

1 Version: J1708

Boost (Step-up) WLED Driver with OVP

DESCRIPTION

The TS19371 is a step-up DC/DC converter

specifically designed to drive white LEDs with a

constant current. The device can drive up to 126 LEDs

(9S14P) from a 12V supply. The output capacitor can

be as small as 4.7µF, 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 TS19371 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: 89% Typical

● Drives Up to 9 LEDs Series @ Vin 9~15V

● Drives Up to 126 LEDs (9S14P) @ Vin 12~15V

● Drives Up to 6 (1W) LEDs Series @ Vin 12V

● Over Output Voltage Protection 30V

● Fast 1.2MHz Switching Frequency

● Requires Only 4.7µF Output Capacitor

● PWM Dimming Control 1kHz to 10kHz

● Analog Dimming Control

● Compliant to RoHS Directive 2011/65/EU and in

accordance to WEEE 2002/96/EC.

● Halogen-Free according to IEC 61249-2-21

APPLICATION

● Cellular Phones

● Portable Electronics Devices PDA, GPS

● LCD Display Module

● White LED Backlighting

● MR-16 Lighting

SOT-26

Pin Definition:

1. SW

2. GND

3. FB

4. CTRL

5. OVP

6. VIN

Notes: MSL 1 (Moisture Sensitivity Level) per J-STD-020

TYPICAL APPLICATION CIRCUIT

TS19371CX6

Taiwan Semiconductor

2 Version: J1708

ABSOLUTE MAXIMUM RATINGS (T

A

= 25°C unless otherwise specified)

(Note 1)

PARAMETER

SYMBOL

LIMIT

UNIT

Input Voltage

V

IN

20

V

Supply Voltage (Recommended)

V

IN

2.5 ~ 18

V

FB Voltage

V

FB

10

V

SW Voltage

V

SW

36

V

CTRL Voltage

V

CTRL

10

V

Ambient Temperature Range

T

A

-40 to +85

°C

Junction Temperature Range

T

J

-40 to +125

°C

THERMAL PERFORMANCE

(Note 3)

PARAMETER

SYMBOL

LIMIT

UNIT

Thermal Resistance Junction to Case

R

θJC

106

°C/W

Thermal Resistance Junction to Ambient

R

θJA

220

°C/W

ELECTRICAL SPECIFICATIONS (T

A

= 25°C unless otherwise specified)

PARAMETER

SYMBOL

CONDITION

MIN

TYP

MAX

UNIT

Input Voltage Range

V

IN

2.5

--

18

V

Feedback Voltage

V

FB

I

SW

=180mA, V

IN

=5V

80

95

110

mV

FB Pin Bias Current

I

B

10

45

100

nA

Supply Current

I

Q

--

2.1

3.0

mA

C

TRL

=0V

--

0.1

1.0

μA

Switching Frequency

F

RSW

0.8

1.2

1.6

MHz

Switch Current Limit

I

CL

--

650

--

mA

Maximum Duty Cycle

D

TMX

85

90

--

%

Switch V

CESAT

V

SAT

At I

SW

= 250mA

--

350

--

mV

Switch Leakage Current

I

LKG

V

SW

=5V

--

0.01

5

μA

Voltage Enable Control

V

CTL

High

1.5

--

V

Low

--

0.4

V

CTRL Pin Bias Current

I

CTL

C

TRL

=2V

--

65

--

μA

Over Voltage Protection

OVP

--

30

--

V

Note:

1. Absolute maximum ratings are limits beyond which damage to the device may occur.

2. The maximum allowable power dissipation is a function of maximum function temperature, T

J

(max), the junction to ambient

thermal resistance, R

θJA

, and the ambient temperature. The maximum allowable, power dissipation at any ambient

temperature is calculated using: PD(MAX)=[T

J

(max)-T

A

]/R

θJA

. Exceeding the maximum allowable power dissipation will

cause excessive die temperature. All limits at temperature extremes are guaranteed via correlation using standard

statistical methods

TS19371CX6

Taiwan Semiconductor

3 Version: J1708

ORDERING INFORMATION

PART NO.

PACKAGE

PACKING

TS19371CX6 RFG

SOT-26

3,000pcs / 7”Reel

FUNCTION BLOCK

PIN DESCRIPTION

PIN NO.

NAME

FUNCTION

1

SW

Switching Pin. This is the collector of the internal NPN power switch.

Connect to inductor and diode. Minimize the metal trace area connected to

this pin to reduce EMI.

2

Ground

Ground Pin. Connect directly to local ground plane.

3

FB

Feedback Pin. Reference voltage is 95mV. Connect LEDs and a resistor at

this pin. LED current is determined by the resistance and CTRL voltage.

4

CTRL

Shutdown Pin and Dimming Control Pin.

V

CTRL

> 1.8V generates full-scale LED current.

V

CTRL

< 0.4V chip is off.

Switching from 04V to 2.0V, PWM duty cycle controls the LED current.

5

OVP

Over Voltage Protection, 30V.

6

VIN

Input Supply Pin. Bypass this pin with a capacitor as close to the device as

possible.

TS19371CX6 RFG

TS19371CX6 RFG

Products related to this Datasheet