rt8003 Richtek Technology Corporation, rt8003 Datasheet - Page 15

• Manufacturer Part Number: rt8003
• Description: 600ma, 2mhz, High-efficiency Synchronous Buck Converter
• Manufacturer: Richtek Technology Corporation

Functional Pin Description
Function Block Diagram
DS8003-03 November 2005
8,9,10
No
3,4
1
2
5
6
7
COMP
FB
Pin Name Pin Function
LX
VDD
NC
EN
FB
COMP
GND
Oscillator
Shutdown
Internal Power MOSFET Switches Output. Connect this pin to the inductor.
Power Input Supply. Input voltage which supplies current to the output pin. Connect this p in
with a low-ESR capacitor to GND
No Internal Connection
Chip Enable (Active High). Logic low shuts down the converter. Floating this pin is forbidden.
Switcher Feedback Voltage. This pin is the inverting input of the error amplifier. FB senses
the switcher output through an external resistor divider network. FB regulation voltage is 0.5V.
Compensation Input. This pin is the output of the internal error amplifier. Connect an external
capacitor to compensate the regulator controlled loop.
Ties the pin directly to the cathode terminal of C
impedance. Signal and Common Ground (Exposed thermal pad is connected to GND). The
GND pad area should be as large as possible and using many vias to conduct the heat into
the buried GND plate of PCB layer. All small-signal, compensation and feedback components
should connect to this pin.
Control
V
REF
EN
Compensation
+
-
Amplifier
Error
Slope
Current Limit
Detector
Comparator
+
-
PWM
Temperature
Detector
Over
Detector
IN
Control
Logic
Zero
and C
OUT
Current
Sense
and ground plane with the lowest
Driver
GND
VDD
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RT8003
LX
3