RT8015DGQW 데이터 시트보기 (PDF) - Richtek Technology
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RT8015DGQW Datasheet PDF : 14 Pages
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RT8015D
Typical Application Circuit
VIN
5V
CIN
22µF
PGOOD
R4
100k
RT8015D
6 PVDD
LX 3, 4
L1
2.2µH
R3
1
C1
0.1µF
7 VDD
8 PGOOD
FB 9
COMP 10
RCOMP
27k
CF
22pF
CCOMP
1nF
ROSC
332k
1 SHDN/RT
GND 2
PGND 5
Note : Using all Ceramic Capacitors
R1
510k
R2
240k
VOUT
2.5V/3A
COUT
22µF x 2
Table 1. Recommended Component Selection
VOUT (V)
R1 (kΩ )
R2 (kΩ ) RCOMP (kΩ) CCOMP (nF)
3.3
750
240
30
1
2.5
510
240
27
1
1.8
300
240
22
1
1.5
210
240
18
1
1.2
120
240
15
1
1.0
60
240
13
1
L1 (μH)
2.2
2.2
2.2
2.2
1.0
1.0
COUT (μF)
22 x 2
22 x 2
22 x 2
22 x 2
22 x 2
22 x 2
Functional Pin Description
Pin No. Pin Name
1
SH DN/RT
2
GND
3, 4 LX
Pin Function
Oscillator Resistor Input. Connecting a resistor to ground from this pin sets the
switching frequency. Forcing this pin to VDD 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.
Internal Power MOSFET Switches Output. Connect this pin to the inductor.
5
PGND
Power Ground. Connect this pin close to the negative terminal of CIN and COUT.
6
PVDD
Power Input Supply. Decouple this pin to PGND with a capacitor.
7
VD D
Signal Input Supply. Decouple this pin to GND with a capacitor. Normally VDD is equal
to PVDD.
8
PGOOD
Power Good Indicator. This pin is open-drain logic output that is pulled to ground
when the output voltage is not within ±12.5% of regulation point.
9
FB
Feedback Pin. This pin receives the feedback voltage from a resistive divider
connected across the output.
Error Amplifier Compensation Point. The current comparator threshold increases with
10 COMP
this control voltage. Connect external compensation elements to this pin to stabilize
the control loop.
No Internal Connection. The exposed pad must be soldered to a large PCB and
11 Exposed Pad
connected to GND for maximum power dissipation.
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2
DS8015D-02 March 2011
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