RT8005 RICHTEK [Richtek Technology Corporation], RT8005 Datasheet - Page 3

• Manufacturer Part Number: RT8005
• Description: 1A, 2MHz, High-Efficiency Synchronous Buck PWM Converter
• Manufacturer: RICHTEK [Richtek Technology Corporation]

Functional Pin Description
Function Block Diagram
DS8005-08 August 2007
Exposed Pad (11)
Pin No.
COMP
9, 10
2, 3
8,
1
4
5
6
7
FB
Oscillator
Shutdown
Control
V
Pin Name
REF
EN
COMP
PGND
PVDD
GND
VDD
EN
LX
FB
Compensation
+
-
Amplifier
Internal Power MOSFET Switches Output. Connect this pin to the inductor.
Power Input Supply. Decouple this pin to PGND with a capacitor.
Signal Input Supply. Decouple this pin to GND with a capacitor. Normally VDD is
equal to PVDD.
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.
Signal Ground. All small-signal components, compensation components and the
exposed pad on the bottom side of the IC should connect to this ground, which in
turn connects to PGND at one point. The exposed pad must be soldered to a
large PCB and connected to GND for maximum power dissipation.
Power Ground. Connect this pin close to the terminal of C
Error
Slope
Current Limit
Detector
Comparator
+
-
PWM
GND
VDD
Temperature
Detector
Over
Detector
Pin Function
Control
Logic
Zero
Current
Sense
Driver
IN
and C
PGND
PVDD
RT8005
www.richtek.com
OUT
.
LX
3