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参数资料
| 型号： | LTC3553EUD#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
| 封装： | 3 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 19/36页 |
| 文件大小： | 518K |
| 代理商： | LTC3553EUD#PBF |
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LTC3553
26
3553fa
PBSTAT to go low. PBSTAT goes high impedance when
ON goes high, except the logic enforces a minimum pulse
width of 50ms on PBSTAT.
In the HR, POFF, PDN1, and PDN2 states, PBSTAT remains
high impedance regardless of the state of ON.
Power-Up Via Pushbutton Press
Figure 8 shows the LTC3553 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 regulators disabled.
Pushbutton application (ON low) for 400ms transitions the
pushbutton circuitry into the PUP state and powers up the
buck followed by the LDO since the SEQ pin is low in this
example. If either BUCK_ON or LDO_ON is low or goes low
after the ve second period the corresponding regulator(s)
will be shut down. In the above example LDO_ON is low
at the end of the ve second period and therefore the LDO
is disabled at the end of the ve second period.
OPERATION
The BUCK_ON and LDO_ON inputs can be driven via a
μP/μC or by one of the regulator outputs through a high
impedance (100kΩ typical) to keep the bucks enabled
as described above. PBSTAT does not go low on initial
pushbutton application for power-up, but will go low with
subsequent ON pushbutton applications in the PUP1,
PUP2 or PON states.
Power-Up Via Applying External Power
Figure 9 shows the LTC3553 powering up through ap-
plication of external power (VBUS). For this example the
pushbutton circuitry starts in the POFF or HR state with
a battery connected and both regulators disabled. 100ms
after VBUS application the pushbutton circuitry transitions
into the PUP state and powers up the buck followed by the
LDO. The 100ms delay time allows the applied supply to
settle. The regulators will stay powered as long as their
respective BUCK_ON and LDO_ON inputs are driven high
before the ve second PUP period is over. If either BUCK_
BAT
VBUS
ON (PB)
PBSTAT
BUCK
LDO
SEQ
BUCK_ON
LDO_ON
STATE
POFF/HR
PON
PUP2/PUP1
3553 TD02
5s
100ms
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Figure 9. Power-Up via Applying External Power
BAT
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
VBUS
ON (PB)
PBSTAT
BUCK
LDO
SEQ
BUCK_ON
LDO_ON
STATE
POFF/HR
PON
PUP2/PUP1
3553 TD01
5s
400ms
Figure 8. Power-Up via Pushbutton Press
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| LTC3554 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators |
| LTC3554EPD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators |
| LTC3554EPD#PBF | 功能描述:IC USB POWER MANAGER 20-UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LTC3554EPD#TRPBF | 功能描述:IC USB POWER MANAGER 20-UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
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