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C3225X5R1C22M Datasheet(PDF) 2 Page - Richtek Technology Corporation

Part # C3225X5R1C22M
Description  3A, 23V, 340kHz Synchronous Step-Down Converter
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

C3225X5R1C22M Datasheet(HTML) 2 Page - Richtek Technology Corporation

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RT8293A
2
DS8293A-03 March 2011
www.richtek.com
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
BOOT
Bootstrap for high side gate driver. Connect a 0.1
µF or greater ceramic
capacitor from BOOT to SW pins.
2
VIN
Input Supply Voltage, 4.5V to 23V. Must bypass with a suitably large ceramic
capacitor.
3
SW
Phase Node. Connect to external L-C filter.
4,
9 (Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
5
FB
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 voltage divider. For an adjustable output, an external resistive
voltage divider is connected to this pin.
6
COMP
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.
7
EN
Enable Input Pin. A logic high enables the converter; a logic low forces the
RT8293A into shutdown mode reducing the supply current to less than 3
µA.
Attach this pin to VIN with a 100k
Ω pull up resistor for automatic startup.
8
SS
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor
from SS to GND to set the soft-start period. A 0.1
µF capacitor sets the
soft-start period to 13.5ms.
VOUT (V)
R1 (k
Ω) R2 (kΩ) RC (kΩ) CC (nF) L (µH) COUT (µF)
8
27
3
33
3.3
22
22 x 2
5
62
11.8
20
3.3
15
22 x 2
3.3
75
24
13
3.3
10
22 x 2
2.5
25.5
12
9.1
3.3
6.8
22 x 2
1.5
10.5
12
5.6
3.3
3.6
22 x 2
1.2
12
24
4.3
3.3
3.6
22 x 2
1
3
12
3.6
3.3
2
22 x 2
Table 1. Recommended Component Selection
Typical Application Circuit
VIN
EN
GND
BOOT
SW
7
2
3
1
L
10
µH
100nF
22
µF x 2
R1
75k
R2
24k
VOUT
3.3V/3A
10
µF x 2
VIN
4.5V to 23V
RT8293A
SS
8
CSS
4, 9 (Exposed Pad)
CBOOT
CIN
0.1
µF
COUT
REN 100k
COMP
CC
3.3nF
RC
13k
CP
Open
6
FB
5


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