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參數(shù)資料
型號: TPS65257RHAT
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: 4 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PQCC40
封裝: 6 X 6 MM, GREEN, PLASTIC, VQFN-40
文件頁數(shù): 11/34頁
文件大小: 2100K
代理商: TPS65257RHAT
PB
Internal
EN
De-bouncing
20 mS
PB
Internal
EN
INT
De-bouncing
20 mS
200 mS
1024 mS
SLVSB32
– SEPTEMBER 2011
Turn On Through Push Button
When the PB pin is not tied to GND, a high to low transition on PB initiates the power on sequence. PB must
stay low for a period of 20ms. Once completing this 20mS, the internal EN is asserted and the PMU is turned on.
Figure 40. Push Button Turn On
Turn Off Through Push Button
A high to low transition on PB initiates the power off sequence. PB must stay low for a period of 20ms. After
completing 20ms, the PMU pulls down the INT to alert the system that the PMU will be shut down within
1024ms. After 1024ms, the PMU will be disabled through an internal EN, which can override the individual EN of
each power converter. The PMU will keep off unless there is another from high to low transition on PB or the
input power is recycled.
Figure 41. Push Button Trun Off
Delayed Start-Up After pb_in
If a delayed start-up is required on any of the buck converters fit a ceramic capacitor to the ENx pins. The delay
added is ~1.67 ms per nF connected to the pin. Note that the EN pins have a weak 1 M
pull-up to the 3V3 rail.
Copyright
2011, Texas Instruments Incorporated
19
Product Folder Link(s): TPS65257
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