RT8284GSP 데이터 시트보기 (PDF) - Richtek Technology
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RT8284GSP Datasheet PDF : 15 Pages
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RT8284
Typical Application Circuit
VIN
4.5V to 23V
CSS
0.1µF
CIN
10µF
REN 100k
2 VIN
BOOT 1
RT8284
SW 3
7 EN
8 SS
FB 5
4, 9 (Exposed Pad) GND
COMP 6
CBOOT L
10nF 10µH
CC
3.3nF
RC
13k
R1
26.1k
R2
10k
VOUT
3.3V/2A
COUT
22µF x 2
Recommended Component Selection
VOUT (V) R1 (kΩ) R2 (kΩ) RC (kΩ)
8
76.8
10
27
5
45.3
10
20
3.3
26.1
10
13
2.5
16.9
10
9.1
1.8
9.53
10
5.6
1.2
3
10
3.6
CC (nF)
3.3
3.3
3.3
3.3
3.3
3.3
L (μH)
22
15
10
6.8
4.7
3.6
CP
Open
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.
SOP-8
(Exposed Pad)
SOP-8
Pin Name
1
1 BOOT
2
2 VIN
3
3 SW
4,
9 (Exposed Pad)
4
GND
5
5 FB
6
6 COMP
7
7 EN
8
8 SS
Pin Function
Bootstrap for High-Side Gate Driver. Connect a 10nF or greater
ceramic capacitor from BOOT to SW pins.
Input Supply Voltage, 4.5V to 23V. Must bypass with a suitably large
ceramic capacitor.
Phase Node. Connect this pin to external L-C filter.
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Feedback Input Pin. This pin is connected to the converter output. It
is used to set the output of the converter to regulate to the desired
value via an internal resistive divider. For an adjustable output, an
external resistive divider is connected to this pin.
Compensation Node. COMP is used to compensate the regulation
control loop. Connect a series RC network from COMP to GND. In
some cases, an additional capacitor from COMP to GND is required.
Enable Input pin. A logic high enables the converter; a logic low
forces the RT8284 into shutdown mode reducing the supply current
to less than 3μA. Attach this pin to VIN with a 100kΩ pull up resistor
for automatic startup.
Soft-Start Control Input. SS controls the soft-start period. Connect a
capacitor from SS to GND to set the soft-Start period. A 0.1μF
capacitor sets the soft-start period to 15.5ms .
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2
DS8284-01 March 2011
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