http://www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf




  Richtek Technology Electronic Components Datasheet  

RT8470 Datasheet

High Brightness LED Driver

No Preview Available !

RT8470 pdf
RT8470
1.2A/1A, Hysteretic, High Brightness LED Driver with
Internal Switch
General Description
The RT8470 is a high efficiency, continuous mode inductive
step-down converter, designed for driving single or multiple
series connected LEDs from a voltage source higher than
the LED voltage. It operates from an input voltage of 7V to
30V and employs hysteretic control with a high side current
sense resistor to set the constant output current.
The RT8470 includes an output switch and a high side
output current sensing circuit, which uses an external
resistor to set the nominal average output current. LED
brightness control is achieved with PWM dimming from
an analog or PWM input signal.
The RT8470 is available in a small TSOT-23-5 package or
a more thermal efficient SOP-8 (Exposed Pad) package.
Ordering Information
RT8470
Package Type
J5 : TSOT-23-5
SP : SOP-8 (Exposed Pad-Option 1)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
RT8470GJ5
BS=DNN
BS= : Product Code
DNN : Date Code
RT8470GSP
RT8470
GSPYMDNN
RT8470GSP : Product Number
YMDNN : Date Code
Features
z 7V to 30V Input Voltage Range
z Hysteretic Control with High Side Current Sensing
z Internal N-MOSFETs with 350mΩ Low RDS(ON)
z 1A Output Current (For TSOT-23-5 Only)
z 1.2A Output Current (For SOP-8 (Exposed Pad) Only)
z Up to 97% Efficiency
z Typical ±5% LED Current Accuracy
z Analog or PWM Control Signal for LED Dimming
z 300Hz On-Board Ramp Generator
z Input Under Voltage Lockout
z Thermal Shutdown Protection
z RoHS Compliant and Halogen Free
Applications
z Automotive LED Lighting
z High Power LED Lighting
z Indicator and Emergency Lighting
z Architectural Lighting
z Low Voltage Industrial Lighting
z Signage and Decorative LED Lighting
Pin Configurations
(TOP VIEW)
VIN SENSE
54
23
LX GND ADJ
TSOT-23-5
VIN
SENSE
GND
ADJ
8
27
GND
36
9
45
GND
LX
NC
NC
SOP-8 (Exposed Pad)
DS8470-04 August 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8470 Datasheet

High Brightness LED Driver

No Preview Available !

RT8470 pdf
RT8470
Typical Application Circuit
VIN
7V to 30V
CIN
RT8470
VIN SENSE
ADJ
GND
LX
RS
optional
D
L
Functional Pin Description
Pin No.
SOP-8
(Exposed Pad)
TSOT-23-5
71
Pin Name
LX
Pin Function
Switch Output Terminal. Drain of internal N-MOSFETs.
3, 8,
9 (Exposed Pad)
2
GND
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Dimming Control Input :
4
3 ADJ
--- Analog signal input for analog control of PWM dimming.
--- PWM signal input for digital PWM dimming.
2 4 SENSE Output Current Sense Terminal. Sense LED string current.
1
5 VIN
Supply Input Voltage.
5, 6
-- NC
No Internal Connection.
Function Block Diagram
VIN
Regulator
Bandgap
UVLO
UVLO
VCC
1.25V
+
-
Ramp Gen.
+ Dimming
ADJ -
www.richtek.com
2
UVLO
Dimming
SENSE
LX
GND
DS8470-04 August 2011


Part Number RT8470
Description High Brightness LED Driver
Maker Richtek
Total Page 13 Pages
PDF Download
RT8470 pdf
Download PDF File
[partsNo] view html
View PDF for Mobile








Similar Datasheet

1 RT8470 High Brightness LED Driver Richtek
Richtek
RT8470 pdf
2 RT8471 High Brightness LED Driver Richtek
Richtek
RT8471 pdf
3 RT8472 High Brightness LED Driver Richtek
Richtek
RT8472 pdf
4 RT8473 High Brightness LED Driver Richtek
Richtek
RT8473 pdf
5 RT8474 High Voltage Multiple-Topology LED Driver Richtek
Richtek
RT8474 pdf
6 RT8474A High Voltage Multiple-Topology LED Driver Richtek
Richtek
RT8474A pdf
7 RT8475 High Voltage High Current LED Driver Controller Richtek
Richtek
RT8475 pdf
8 RT8476 Two-Stage Hysteretic LED Driver Controller Richtek
Richtek
RT8476 pdf
9 RT8476A Two-Stage Hysteretic LED Driver Controller Richtek
Richtek
RT8476A pdf





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

site map

webmaste! click here

contact us

Buy Components