rt8470 Richtek Technology Corporation, rt8470 Datasheet - Page 2

• Manufacturer Part Number: rt8470
• Description: 1.2a/1a, Hysteretic, High Brightness Led Driver With Internal Switch
• Manufacturer: Richtek Technology Corporation

RT8470
Typical Application Circuit
Functional Pin Description
Function Block Diagram
www.richtek.com
2
9 (Exposed Pad)
(Exposed Pad)
SOP-8
3, 8,
5, 6
7
4
2
1
Pin No.
TSOT-23-5
ADJ
2
3
4
5
--
1
7V to 30V
Regulator
Ramp Gen.
UVLO
V
LX
GND
ADJ
SENSE
VIN
NC
Pin Name
VIN
IN
1.25V
+
-
C
UVLO
IN
Bandgap
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Dimming Control Input :
--- Analog signal input for analog control of PWM dimming.
--- PWM signal input for digital PWM dimming.
Output Current Sense Terminal. Sense LED string current.
Supply Input Voltage.
No Internal Connection.
Switch Output Terminal. Drain of internal N-MOSFETs.
Dimming
V
+
-
CC
VIN
ADJ
GND
RT8470
SENSE
LX
Dimming
UVLO
R
Pin Function
S
L
optional
D
LX
GND
SENSE
DS8470-03 March 2011