RT8453BGSP Richtek USA Inc, RT8453BGSP Datasheet - Page 2

• Manufacturer Part Number: RT8453BGSP
• Description: IC LED DVR BUCK 40V 1.5A 8SOP
• Manufacturer: Richtek USA Inc

Specifications of RT8453BGSP

• Constant Current: Yes
• Internal Driver: Yes
• Type - Primary: Backlight, General Purpose
• Mounting Type: Surface Mount
• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Frequency: 400kHz ~ 600kHz
• Voltage - Supply: 4.5 V ~ 40 V
• Package / Case: 8-SOIC (0.154", 3.90mm Width) Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Operating Temperature: -
• Other names: 1028-1004-2

RT8453B
Typical Application Circuit
www.richtek.com
Functional Pin Description
9 (Exposed Pad)
Pin No.
6,
1
2
3
4
5
7
8
4.5V to 40V
ISN
VC
ACTL
EN
SS
GND
SW
VCC
Dimming
PWM
Dimming Control
Pin Name
Analog
or
V
5V
IN
10k
R5
C6
3.3nF
10
Current Sense Amplifier Negative Input. Voltage threshold between V
is 190mV.
PWM Converter Loop Compensation Node.
Analog Dimming Control. Effective programming range is between 0.3V and 1.2V.
Chip Enable (Active High). When low, chip is in shutdown mode.
Soft Start. A capacitor of at least 10nF is required for soft start.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
PWM Converter Switch Node.
Power Supply of the Chip. For good bypass, a low ESR capacitor is required.
C3
10nF
C2
8
3
4
2
5
VCC
ACTL
EN
VC
SS
RT8453B
GND
ISN
SW
1
7
6, 9 (Exposed Pad)
Pin Function
190mV
R2
22µH
L1
R3
R4
DS8453B-00 August 2010
C1
D1
CC
and ISN