rt8458 Richtek Technology Corporation, rt8458 Datasheet

rt8458

Manufacturer Part Number

rt8458

Description

High Efficiency Pwm Buck Led Driver Controller

Manufacturer

Richtek Technology Corporation

Datasheet

1.RT8458.pdf (11 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

rt8458GJ6

Manufacturer:

RCT

Quantity:

2 898

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Download datasheet (229Kb)

High Efficiency PWM Buck LED Driver Controller

General Description

The RT8458 is a PWM controller with an integrated high

side floating gate driver. It is used for step down converters

by well controlling the external MOSFET and regulating a

constant output current. The output duty cycle of the

RT8458 can be up to 100% for wider input voltage

application, such as E27 and PAR30 off-line LED lighting

products.

The RT8458 also

oscillator, an internal 178mV precision reference, and a

PWM comparator with latching logic. The accurate output

LED current is achieved by an averaging current feedback

loop and the LED current dimming can be easily controlled

via the ACTL pin. The RT8458 also has multiple features

to protect the controller from fault conditions, including

Under Voltage Lockout (UVLO), Over Current Protection

(OCP) and Over Voltage Protection (OVP). Additionally,

to ensure the system reliability, the RT8458 is built with

the thermal protection function.

The RT8458 is housed in a TSOT-23-6 package. Thus,

the components in the whole LED driver system can be

made very compact.

Ordering Information

Note :

Richtek products are :

DS8458-00 March 2011

RT8458

RoHS compliant and compatible with the current require-

Suitable for use in SnPb or Pb-free soldering processes.

ments of IPC/JEDEC J-STD-020.

Package Type

J6 : TSOT-23-6

Lead Plating System

G : Green (Halogen Free and Pb Free)

features a 47kHz

fixed frequency

Features

Applications

Pin Configurations

Marking Information

Low Cost and Efficient Buck Converter Solution

Universal Input Voltage Range with Off-Line

Topology

Programmable Constant LED Current

Dimmable LED Current by ACTL

Output LED String Open Protection

Output LED String Short Protection

Output LED String Over Current Protection

Built-in Thermal Protection

TSOT-23-6 Package

RoHS Compliant and Halogen Free

E27, PAR30, Offline LED Lights

01=DNN

SENSE VC ACTL

01= : Product Code

DNN : Date Code

(TOP VIEW)

VCC GND GATE

TSOT-23-6

RT8458

www.richtek.com

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