RT8015
Typical Application Circuit
RT8015
V
IN
2.6V to 5.5V
C
IN
22uF
R
OSC
332k
5 PVDD
6 VDD
4
PGND
LX
3
L1
2.2uH
R1
510k
R
COMP
13k
C
COMP
1nF
R2
240k
C
OUT
22uF
V
OUT
2.5V/2A
FB 7
COMP 8
1 SHDN/RT
GND 2,
Exposed
Pad (9)
Note : Using all Ceramic Capacitors
Recommended Component for Different Output Voltage Applications
V
OUT
3.3V
2.5V
1.8V
1.2V
L1 (uH) C
OUT
(uF)
2.2
2.2
1.0
1.0
22
22
22
22
R1 (kΩ)
750
510
300
120
R2 (kΩ)
240
240
240
240
R
COMP
(kΩ) C
COMP
(nF)
13
13
7.5
7.5
1
1
1.5
1.5
Functional Pin Description
Pin No.
1
Pin Name
SHDN/RT
Pin Function
Oscillator Resistor Input. Connecting a resistor to ground from this pin sets the
switching frequency. Forcing this pin to V
DD
causes the device to be shut down.
Signal Ground. All small-signal components and compensation components 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.
Internal Power MOSFET Switches Output. Connect this pin to the inductor.
Power Ground. Connect this pin close to the (−) terminal of C
IN
and C
OUT
.
Power Input Supply. Decouple this pin to PGND with a capacitor.
Signal Input Supply. Decouple this pin to GND with a capacitor. Normally V
DD
is
equal to PVDD.
Feedback Pin. Receives the feedback voltage from a resistive divider connected
across the output.
Error Amplifier Compensation Point. The current comparator threshold increases
8
COMP
with this control voltage. Connect external compensation elements to this pin to
stabilize the control loop.
2,
9 (Exposed Pad)
3
4
5
6
7
GND
LX
PGND
PVDD
VDD
FB
www.richtek.com
2
DS8015-03 March 2011
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
