RT8009-12GB Richtek USA Inc, RT8009-12GB Datasheet - Page 11

• Manufacturer Part Number: RT8009-12GB
• Description: IC DCDC CONV STP-DN SYNC SOT23-5
• Manufacturer: Richtek USA Inc
• Type: Step-Down (Buck), PWMr

Specifications of RT8009-12GB

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 1.2V
• Current - Output: 600mA
• Frequency - Switching: 1.25MHz
• Voltage - Input: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SC-74A, SOT-753
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Recommended component selection for Typical Application
DS8009-06 February 2011
Component Supplier
V
Connect feedback network behind the output capacitors.
Connect all analog grounds to a command node and
Keep the loop area small. Place the feedback
components near the RT8009.
then connect the command node to the power ground
behind the output capacitors.
An example of 2-layer PCB layout is shown in Figure 7
and Figure 8 for reference.
IN
Component Supplier
C3
4.7uF
TAIYO YUDEN
TAIYO YUDEN
GOTREND
GOTREND
TAIYO YUDEN
TAIYO YUDEN
TAIYO YUDEN
R3
Sumida
Sumida
1
3
MURATA
MURATA
MURATA
VIN
EN
TDK
TDK
RT8009
Figure 6. EVB Schematic
GND
2
FB
LX
CDRH2D14
CDRH2D14
NR 3015
NR 3015
GTSD32
GTSD32
5
4
Series
4.7uH
L1
GRM219R60J106ME19
GRM188R60J475KE19
GRM219R60J106KE19
JMK107BJ106MA
JMK212BJ106RD
JMK107BJ475RA
C1608JB0J475M
C2012JB0J106M
Inductance ( H) DCR (m ) Current Rating (mA) Dimensions (mm)
C2
C1
Table 2. Capacitors for C
Part No.
2.2
4.7
2.2
4.7
2.2
4.7
R2
R1
V
Table 1. Inductors
OUT
10uF
C4
120
135
146
60
75
58
IN
Capacitance ( F)
and C
4.7
4.7
4.7
10
10
10
10
10
OUT
1480
1020
1500
1000
1500
1100
Figure 8. Bottom Layer
Figure 7. Top Layer
Case Size
3.85x3.85x1.8
3.85x3.85x1.8
4.5x3.2x1.55
4.5x3.2x1.55
0603
0805
0603
0805
0805
0603
0603
0805
3x3x1.5
3x3x1.5
RT8009
www.richtek.com
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