RT8250GSP View Datasheet(PDF) - Richtek Technology
Part Name
Description
Manufacturer
RT8250GSP Datasheet PDF : 12 Pages
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RT8250
Typical Application Circuit
VIN
4.75V to 23V
REN
100k
2 VIN
CIN
10µFx2
7 EN
BOOT 1
RT8250
SW 3
8 SS
CSS
0.1µF
4,
Exposed Pad(9)
GND
FB 5
COMP 6
CBOOT L1
10nF 10µH
CC
3.9nF
RC
6.8k
R1
26.1k
R2
10k
VOUT
3.3V/3A
COUT
22µFx2
Table 1. Recommended Component Selection
VOUT (V)
R1 (kΩ) R2 (kΩ) RC (kΩ)
15
15 3
10
30
10
9 7.6
10
20
8
7 6.8
10
15
5
4 5.3
10
13
3 .3
2 6.1
10
6.8
2 .5
1 6.9
10
6.2
1 .8
9 .53
10
4.3
1 .2
3
10
3
CC (nF)
3 .9
3 .9
3 .9
3 .9
3 .9
3 .9
3 .9
3 .9
CP
NC
L (μH)
33
22
22
15
10
6.8
4.7
3.6
COUT (μF)
22 x 2
22 x 2
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
Pin Function
1
BOOT
2
VIN
3
4,
9 (Exposed Pad)
SW
GND
5
FB
6
COMP
7
EN
8
SS
Bootstrap for High Side Gate Driver. Connect a 10nF or greater ceramic capacitor
from the BOOT pin to SW pin.
Voltage Supply Input. The input voltage range is from 4.5V to 23V. A suitable large
capacitor must be bypassed with this pin.
Switching Node. Connect the output LC filter between the SW pin and output load.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Output Voltage Feedback Input. The feedback reference voltage is 0.925V
typically.
Compensation Node. This pin is used for compensating the regulation control
loop. A series RC network is required to be connected from COMP to GND. If it is
needed, an additional capacitor should be connected from COMP to GND.
Enable Input. A logic high enables the converter, a logic low forces the converter
into shutdown mode reducing the supply current to less than 3μA. For automatic
startup, connect this pin to VIN with a 100kΩ pull up resistor.
Soft-Start Control Input. The soft-start period can be set by connecting a capacitor
from the SS to GND. A 0.1μF capacitor sets the soft-start period to 13ms typically.
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DS8250-05 March 2011
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