RT8290 查看數據表（PDF） - Richtek Technology
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RT8290 Datasheet PDF : 12 Pages
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RT8290
Marking Information
RT8290GSP : Product Number
RT8290
GSPYMDNN
YMDNN : Date Code
RT8290
ZSPYMDNN
RT8290ZSP : Product Number
YMDNN : Date Code
VOUT (V)
15
10
8
5
3 .3
2 .5
1 .8
1 .2
Table 1. Recommended Component Selection
R1 (kΩ) R2 (kΩ) RC (kΩ) CC (nF)
L (μH)
15 3
10
30
3 .9
33
9 7.6
10
20
3 .9
22
7 6.8
10
15
3 .9
22
4 5.3
10
13
3 .9
15
2 6.1
10
6.8
3 .9
10
1 6.9
10
6.2
3 .9
6.8
9 .53
10
4.3
3 .9
4.7
3
10
3
3 .9
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.
1
2
3
Pin Name
Pin Function
BOOT
Bootstrap for High Side Gate Driver. Connect a 10nF or greater ceramic capacitor
from the BOOT pin to SW pin.
VIN
Voltage Supply Input. The input voltage range is from 4.5V to 23V. A suitable large
capacitor must be bypassed with this pin.
SW
Switching Node. Connect the output LC filter between the SW pin and output load.
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
Output Voltage Feedback Input. The feedback reference voltage is 0.925V
typically.
Compensation Node. This pin is used for compensating the regulation control
6
COMP loop. A series RC network is required to be connected from COMP to GND. If
needed, an additional capacitor can be connected from COMP to GND.
Enable Input. A logic high enables the converter, a logic low forces the converter
7
EN
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.
8
SS
Soft-Start Control Input. The soft-start period can be set by connecting a capacitor
from SS to GND. A 0.1μF capacitor sets the soft-start period to 15.5ms typically.
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2
DS8290-02 March 2011
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