RT8015 데이터 시트보기 (PDF) - Richtek Technology
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RT8015 Datasheet PDF : 15 Pages
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RT8015
Typical Application Circuit
VIN
2.6V to 5.5V
CIN
22uF
ROSC
332k
Note : Using all Ceramic Capacitors
RT8015
5 PVDD
LX 3
L1
2.2uH
6 VDD
4 PGND
1 SHDN/RT
FB 7
COMP 8 RCOMP 13k
GND 2,
Exposed
Pad (9)
CCOMP
1nF
R1
510k
R2
240k
VOUT
2.5V/2A
COUT
22uF
Recommended Component for Different Output Voltage Applications
VOUT
3.3V
L1 (uH) COUT (uF) R1 (kΩ)
2.2
22
750
R2 (kΩ) RCOMP (kΩ) CCOMP (nF)
240
13
1
2.5V
2.2
22
510
240
13
1
1.8V
1.0
22
300
240
7.5
1.5
1.2V
1.0
22
120
240
7.5
1.5
Functional Pin Description
Pin No.
Pin Name
Pin Function
Oscillator Resistor Input. Connecting a resistor to ground from this pin sets the
1
SHDN/RT
switching frequency. Forcing this pin to VDD causes the device to be shut down.
Signal Ground. All small-signal components and compensation components should
2,
GND
9 (Exposed Pad)
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.
3
LX
Internal Power MOSFET Switches Output. Connect this pin to the inductor.
4
PGND Power Ground. Connect this pin close to the (−) terminal of CIN and COUT.
5
PVDD Power Input Supply. Decouple this pin to PGND with a capacitor.
6
VDD
Signal Input Supply. Decouple this pin to GND with a capacitor. Normally VDD is
equal to PVDD.
Feedback Pin. Receives the feedback voltage from a resistive divider connected
7
FB
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.
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2
DS8015-03 March 2011
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