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参数资料
| 型号： | LTC3554EPD#TRPB |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.5 A BATTERY CHARGE CONTROLLER, 1295 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 3 X 3 MM, 0.55 MM HEIGHT, LEAD FREE, PLASTIC, UTQFN-20 |
| 文件页数： | 20/36页 |
| 文件大小： | 418K |
| 代理商： | LTC3554EPD#TRPB |
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LTC3554
27
3554p
BAT
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
VBUS
ON (PB)
PBSTAT
BUCK1
BUCK2
PGOOD
PWR_ON1
PWR_ON2
STATE
POFF/HR
PON
PUP2/PUP1
3554 TD01
5s
230ms
400ms
Figure 7. Power-Up Via Pushbutton Press
OPERATION
state. If a valid HRST event is present in PON, PDN2 or
POFF, then the state machine will transition to the PDN1
state and subsequently transition to the HR state one
second later.
Debounced Pushbutton Output (PBSTAT)
In the PON, PUP1, and PUP2 states, the PBSTAT open-
drain output pin outputs a debounced version of the ON
pushbutton signal. ON must be held low for at least 50ms
for the pushbutton interface to recognize it and cause
PBSTAT to go low. PBSTAT goes high impedance when
ON goes high, except the logic enforces a minimum pulse
width on PBSTAT. Once it goes low, it stays low for at
least 50ms.
In the HR, POFF, PDN1, and PDN2 states, PBSTAT remains
high impedance regardless of the state of ON.
Power-Up Via Pushbutton Press
Figure 7 shows the LTC3554 powering up through ap-
plication of the external pushbutton. For this example the
pushbutton circuitry starts in the POFF or HR state with a
battery connected and both bucks disabled. Pushbutton
application (ON low) for 400ms transitions the pushbutton
circuitry into the PUP state and powers up buck1 followed
by buck2. If either PWR_ON is low or goes low after the
5 second period the corresponding buck(s) will be shut
down. In the above example PWR_ON2 is low at the end
of the 5 second period and therefore buck2 is disabled
at the end of the 5 second period. PGOOD is asserted
once all enabled bucks are within 8% of their regulation
voltage for 230ms.
The PWR_ON inputs can be driven via a μP/μC or by one
of the buck outputs through a high impedance (100kΩ
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