TPS54310_15 Datasheet, PDF (13/28 Pages) Texas Instruments – 3-V to 6-V Input, 3-A Output Synchronous-Buck PWM Switcher With Integrated FETs (SWIFT™)

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9 Application and Implementation
TPS54310
SLVS412E – DECEMBER 2001 – REVISED DECEMBER 2014
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The TPS54310 is a 3-V to 6-V integrated FET synchronous buck converter. It is used to convert a DC input
voltage on the VIN pins to a lower output voltage at 3 A maximum output current.
9.2 Typical Application
Figure 10 shows the schematic diagram for a typical TPS54310 application. The TPS54310 (U1) can provide up
to 3 A of output current at a nominal output voltage of 3.3 V. For proper thermal performance, the power pad
underneath the TPS54310 integrated circuit needs to be soldered well to the printed-circuit board.
VIN
V_I ^{J1 2}
GND
1
+
C2
1
U1
TPS54310PWP
R3 ₂₀
RT
VIN ¹⁶
R1
10 kW
PWRGD
C3
0.1 mF
71.5 kW
19 _SYNC
18 _SS/ENA
17 _VBIAS
4 _PWRGD
3 _COMP
VIN ¹⁵
VIN ¹⁴
PH ¹⁰
PH ⁹
PH ⁸
PH ⁷
2
PH
VSENSE
BOOT
6
5
1 _AGND
PGND ¹³
12
C5
C4
3900 pF
PGND
PGND ¹¹
100 pF
PwrPAD
R2
3.74 kW
C6
R6
C8
10 mF
L1
1.2 mH
C7
0.047 mF
+
C9
180 mF
4V
R7
1 Optional
R4
3.74 kW
2700 pF ^{732 W}
R5
10 kW
49.9 W
Figure 10. TPS54310 Schematic
C11
1000 pF
J3
1
V_O
2
GND
9.2.1 Design Requirements
Design requirements for this example are as follows:
• DC Input Voltage Range: 3 V – 6 V
• DC Output Current Range: 0 A – 3 A
• Load Regulation: ±0.5%
• Output Voltage Ripple: 30 mV
• Input Voltage Ripple: 150 mV
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