RT8004 RICHTEK [Richtek Technology Corporation], RT8004 Datasheet - Page 3

• Manufacturer Part Number: RT8004
• Description: 3A, 4MHz, Synchronous Step-Down Regulator
• Manufacturer: RICHTEK [Richtek Technology Corporation]

DS8004-03
Functional Pin Description
RT8004PS RT8004PCP RT8004PQP
10,11,
14, 15
12, 13
9, 16
1
2
3
4
5
6
7
8
September 2007
8, Exposed
Pad (17)
10,11,
14, 15
12, 13
Pin No.
9, 16
1
2
3
4
5
6
7
6, Exposed
8, 9, 12, 13 LX
Pad (17)
10, 11
7, 14
15
16
1
2
3
4
5
VDD
PGOOD
COMP
FB
RT
SYNC
EN/SS
GND
PVDD
PGND
Name
Pin
Error Amplifier Compensation Pin. The current comparator
threshold increases with this control voltage. Connect external
compensation elements to this pin to stabilize the control loop.
Oscillator Resistor Input. Connecting a resistor to ground from this
pin sets the switching frequency.
External Clock Synchronization Input. The internal oscillator can
be synchronized to an external clock applied to this pin. If not use,
please connect this pin to VDD or GND.
Internal Power MOSFET Switches Output. Connect this pin to the
inductor.
Feedback Pin. Receives the feedback voltage from a resistive
divider connected across the output.
Signal Input Supply. Decouple this pin to GND with a capacitor.
Normally VDD is equal to PVDD.
Power Good Indicator. Open-drain logic output that is pulled to
ground when the output voltage is not within ±12.5% of regulation
point.
Enable Control and Soft-Start Input. Forcing this pin below 0.5V
shuts down the RT8004. In shutdown all functions are disabled
drawing < 1uA of supply current. A capacitor to ground from this
pin sets the ramp time to full output current.
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.
Power Input Supply. Decouple this pin to PGND with a capacitor.
Power Ground. Connect this pin close to the terminal of C
C
OUT
.
Pin Function
RT8004
www.richtek.com
IN
and
3