TPS40007
TPS40009
SLUS589A鈭?NOVEMBER 2003 鈭?REVISED MAY 2004
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.
VDD
3.0 V to 5.5 V
100
碌F
20 kW
TPS40007
1
ILIM
BOOT
10
10
碌F
Si4866DY
2
3.6 nF
7.68 k鈩?/div>
3
FB
HDRV
9
100 nF
IHLP5050CE鈭?1
VOUT 1.8 V
10 A
10
碌F
COMP
SW
8
470
碌F
243
鈩?/div>
15.7 k鈩?/div>
100 pF
4.7 nF
4
SS/SD
VDD
7
Si4866DY
3.3 nF
5
GND
LDRV
6
10 k鈩?/div>
UDG鈭?3159
Figure 1. Typical Application Circuit
6
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