- 您现在的位置：买卖IC网 > PDF目录44991 > LTC3553EUD#PBF (LINEAR TECHNOLOGY CORP) 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 PDF资料下载
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： | 21/36页 |
| 文件大小： | 518K |
| 代理商： | LTC3553EUD#PBF |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页当前第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
LTC3553
28
3553fa
the application up and down for housekeeping and other
activities not needing the user’s control.
Power-Down by De-Asserting Both BUCK_ON and
LDO_ON
Figure 11 shows the LTC3553 powering down by μC/μP
control. For this example the pushbutton circuitry starts in
the PON state with a battery connected and both regula-
tors enabled. The user presses the pushbutton (ON low)
for at least 50ms, which generates a debounced, low
impedance pulse on the PBSTAT output. After receiving
the PBSTAT signal, the μC/μP software decides to drive
both the BUCK_ON and LDO_ON inputs low in order to
power down. After the last input goes low, the pushbutton
circuitry will enter the PDN2 state. In the PDN2 state a one
second wait time is initiated after which the pushbutton
circuitry enters the POFF state. During this one second
time, the ON, BUCK_ON and LDO_ON inputs as well as
external power application are ignored to allow all LTC3553
OPERATION
generated supplies to go low. Though the above assumes
a battery present, the same operation would take place
with a valid external supply (VBUS) with or without a bat-
tery present.
Holding ON low through the one second power-down
period will not cause a power-up event at end of the one
second period. The ON pin must be brought high following
the power-down event and then go low again to establish
a valid power-up event.
UVLO Minimum Off-Time Timing (Low Battery)
Figure 12 assumes the battery is either missing or at a
voltage below the VOUT UVLO threshold, and the appli-
cation is running via external power (VBUS). A glitch on
the external supply causes VOUT to drop below the VOUT
UVLO threshold temporarily. This VOUT UVLO condition
causes the pushbutton circuitry to transition from the PON
state to the PDN2 state. Upon entering the PDN2 state the
regulators power down together.
BAT
VBUS
ON (PB)
PBSTAT
BUCK
LDO
SEQ
BUCK_ON
LDO_ON
STATE
PON
PUP2
PDN2
3553 TD05
5s
1s, BUCK POWERS UP
LDO POWERS UP
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Figure 12. UVLO Minimum Off-Time Timing
BAT
VBUS
ON (PB)
PBSTAT
BUCK
LDO
BUCK_ON
LDO_ON
STATE
PON
POFF
PDN2
3553 TD04
1s
C/P CONTROL
50ms
C/P CONTROL
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Figure 11. Power-Down via De-Assertion of
BUCK_ON and LDO_ON
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3554EPD#TRPB | 0.5 A BATTERY CHARGE CONTROLLER, 1295 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC3560IS6#TRPBF | 2.1 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3563EDC | 1.75 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3568EDD#TR | 4 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO10 |
| LTC3568IDD | 4 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO10 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LTC3554EPDPBF | 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 |
发布紧急采购，3分钟左右您将得到回复。