Datasheet

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SLUS589B− NOVEMBER 2003 − REVISED FEBRUARY 2005
6
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APPLICATION INFORMATION
The TPS4000x series of synchronous buck controller devices is optimized for high-efficiency dc-to-dc
conversion in non-isolated distributed power systems. A typical application circuit is shown in Figure 1.
The TPS40007 and TPS40009 are the controllers of choice for general-purpose synchronous buck designs.
They are designed to startup into applications where the output voltage is pre-biased, and without having the
synchronous rectifier interfere with the pre-bias condition. PWM pulses are enabled when the soft-start voltage
crosses the feedback level dictated by the pre-bias output. Moreover, the pre-biased output ramps up smoothly
from its pre-bias value and into regulation.
UDG−03159
10 µF
20 kW
100 µF
7.68 kΩ
470 µF
10 µF
15.7 kΩ
243 Ω
10 kΩ
V
OUT
1.8 V
10 A
Si4866DY
IHLP5050CE−01
Si4866DY
5
8
7
10
9
1
2
3
ILIM
FB
COMP
GND
HDRV
SW
VDD
LDRV
3.6 nF
4
4.7 nF
SS/SD
6
BOOT
100 pF
TPS40007
V
DD
3.0 V to 5.5 V
3.3 nF
100 nF
Figure 1. Typical Application Circuit