RT8450BGCP Richtek USA Inc, RT8450BGCP Datasheet - Page 4

• Manufacturer Part Number: RT8450BGCP
• Description: IC LED DRIVER PWM 16TSSOP
• Manufacturer: Richtek USA Inc

Specifications of RT8450BGCP

• Internal Driver: Yes
• Type - Primary: Backlight
• Mounting Type: Surface Mount
• Topology: PWM, Step-Down (Buck), Step-Up (Boost)
• Number Of Outputs: 1
• Frequency: 400kHz ~ 600kHz
• Voltage - Supply: 4.5 V ~ 40 V
• Package / Case: 16-TSSOP (0.173", 4.40mm Width) Exposed pad
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Other names: 1028-1003-2

RT8450/B
Function Block Diagram
www.richtek.com
4
17 (Exposed Pad)
(Exposed Pad)
9, 10, 11, 12,
TSSOP-16
13, 14
15
16
8
Pin No.
13 (Exposed Pad)
WDFN-12L 3x3
VCC1
DCTL
OVP
EN
VC
SS
10
12
11
9,
8
4.5V
1.2V
1.4V
V
190
ISP
(mV)
Pin Name
0
– V
VCC2
VCC1
-
+
+
-
+
-
+
-
1.2V
GND
SW
SS
ISN
Shutdown
6µA
0.3
Soft Start Pin, 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 Boost Converter Switch Node.
Bipolar Power Switch Base Current Supply. Typical beta of the
power NPN switch is approximately 70. VCC2 can be
connected either to VCC1 or to a separate lower voltage, as
low as 3V, for better system efficiency and/or heat concern. A
good bypass is necessary.
Power Supply of the Chip. For good bypass, a low ESR
capacitor is required.
OSC
Figure 6
ACTL
1.2
GM
+
-
S
R
R
-
+
V
ACTL
SW
(V)
Pin Function
DS8450/B-02 November 2009
VCC2
ISN
ISP
GND