RT8453BGSP Richtek USA Inc, RT8453BGSP Datasheet - Page 6

• 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 Operating Characteristics
www.richtek.com
(VCC – ISN) Threshold Voltage vs. ACTL Voltage
200.0
197.5
195.0
192.5
190.0
187.5
185.0
182.5
180.0
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
100
200
180
160
140
120
100
95
90
85
80
75
70
65
60
80
60
40
20
0
10
4
0
LED Current vs. Input Voltage
8
0.25
15
Efficiency vs. Input Voltage
12
ACTL Input Voltage (V)
20
0.5
16
Input Voltage (V)
Input Voltage (V)
T
A
20
= 25°C, I
0.75
25
3 LED
5 LED
7 LED
24
V
IN
LED
= 24V, V
V
30
28
1
= 450mA, 3 LEDs
EN
= 3V, R2 = 1Ω
32
OUT
1.25
35
= 15V
36
1.5
40
40
200.0
197.5
195.0
192.5
190.0
187.5
185.0
182.5
180.0
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
(VCC – ISN) Threshold Voltage vs. ACTL Duty
100
95
90
85
80
75
70
65
60
200
180
160
140
120
100
80
60
40
20
0
10
-50
0
10
-25
15
LED Current vs. Temperature
Efficiency vs. Input Voltage
20
0
30
20
Temperature (°C)
Input Voltage (V)
ACTL Duty (%)
T
40
A
25
V
= 125°C, I
DS8453B-00 August 2010
IN
25
50
= 24V, R2 = 1Ω, V
3 LED
5 LED
7 LED
V
50
IN
60
LED
= 24V, V
30
= 450mA, 3 LEDs
70
75
OUT
80
35
EN
100
= 15V
= 3V
90
100
125
40