欧美成人免费电影,国产欧美一区二区三区精品酒店,精品国产a毛片,色网在线免费观看

參數資料
型號: LTC3445EUF#TRPBF
廠商: Linear Technology
文件頁數: 20/24頁
文件大小: 475K
描述: IC REG TRPL BUCK/LINEAR 24-QFN
標準包裝: 2,500
拓撲: 降壓(降壓)(1),線性(LDO)(2)
功能: 任何功能
輸出數: 3
頻率 - 開關: 1.5MHz
電壓/電流 - 輸出 1: 0.85 V ~ 1.55 V,600mA
電壓/電流 - 輸出 2: 可調至0.6V,50mA
電壓/電流 - 輸出 3: 可調至0.6V,50mA
帶 LED 驅動器:
帶監控器:
帶序列發生器:
電源電壓: 2.5 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 24-WFQFN 裸露焊盤
供應商設備封裝: 24-QFN 裸露焊盤(4x4)
包裝: 帶卷 (TR)
20
LTC3445
3445fa
prevent oscillations. The LTC3445 LDOs are micropower
devices and output transient response will be a function of
output capacitance. Larger values of output capacitance
decrease the peak deviations and provide improved tran-
sient response for larger load current changes.
PowerPath CONTROLLER
The PowerPath circuitry in the LTC3445 is used to provide
backup power from V
BACKUP
 to the V
CC
BATT pin when
V
CC1
 is low or disconnected. When V
CC1
 is below 2.8V, the
PowerPath routes V
BACKUP
, typically a coin cell, to the V
CC
BATT pin. While V
BACKUP
 is selected there is no current
limiting except for a small (<5&) resistance from the
V
BACKUP
 input to the V
CC
 BATT output. The LTC3445 sinks
less than 6.5礎 from V
BACKUP
 when it is selected and sinks
less than 0.1礎 from V
BACKUP
 when it is not selected.
When V
CC1
 exceeds 2.8V, V
BACKUP
 is disconnected from
V
CC
BATT and an internal LDO regulates the V
CC
BATT
voltage to the minimum of V
CC1
 or typically 3V. The
internal LDO is current limited to less than 50mA, but
greater than 10mA. Capacitance on the V
CC
BATT pin
should be at least 2礔 with an ESR less than 3&.
V
BACKUP
 will be routed to the V
CC
BATT output when the
main battery voltage falls below 2.4V. As the main battery,
V
CC1
, voltage drops from 3V to 2.4V, the LDO will be in
dropout, V
CC
BATT will follow V
CC1
 down, rebounding to
V
BACKUP
 when V
CC1
 falls below 2.4V. If V
CC1
 is removed
quickly, the capacitor on V
CC
BATT will limit the V
CC
BATT
droop until V
BACKUP
 is switched in.
The V
TRACK
 input offers the capability of the V
CC
BATT
voltage to follow the voltage on V
TRACK
 up to V
CC1
. In
effect, V
TRACK
 overrides the internal reference of the LDO,
resulting in the LDO output (V
CC
BATT) having a gain of 1
relative to V
TRACK
 once V
TRACK
 exceeds a typical value of
3V. V
CC
BATT will follow V
TRACK
 to within 200mV provid-
ing V
TRACK
 does not exceed the dropout voltage of the
LDO, which is powered by V
CC1
.
V
BACKUP
 should be present prior to V
CC1
 being connected.
V
BACKUP
 provides power to the BATTFAULT driver which
APPLICATIO S I FOR ATIO
U
U
U
is used to detect an absent or low V
CC1
. If V
BACKUP
 is not
present, the LTC3445 will be unable to pull the BATTFAULT
pin low to signal a V
CC1
 fault condition.
Output Capacitance and Transient Response
The LDO used LTC3445 PowerPath is designed to be
stable with a wide range of output capacitors. A minimum
output capacitor of 2.2礔 with an ESR of 3& or less is
recommended to prevent oscillations. The LTC3445
PowerPath LDO is a micropower device and output tran-
sient response will be a function of output capacitance.
Larger values of output capacitance decrease the peak
deviations and provide improved transient response for
larger load current changes.
THERMAL CONSIDERATIONS
In most applications the LTC3445 does not dissipate
much heat due to its high efficiency. But, in applications
where the LTC3445 is running at high ambient tempera-
ture with low supply voltage and high duty cycles, such as
in dropout, the heat dissipated may exceed the maximum
junction temperature of the part. If the junction tempera-
ture reaches approximately 150癈, both power switches
will be turned off and the SW node will become high
impedance. The remaining regulators will also turn off.
To ensure the LTC3445 doesnt exceed the maximum
junction temperature, the user will need to do some
thermal analysis. The goal of the thermal analysis is to
determine whether the power dissipated exceeds the
maximum junction temperature of the part. The tempera-
ture rise is given by:
T
R
 = ?/DIV>
JA
" (PD
BUCK
 + PD
LDO1
 + PD
LDO2
 + PD
PowerPath
)
where P
D
 is the power dissipated by the regulator and ?/DIV>
JA
is the thermal resistance from the junction of the die to the
ambient temperature.
The junction temperature, T
J
, is given by:
T
J
 = T
A
 + T
R
where T
A
 is the ambient temperature.
相關PDF資料
PDF描述
LTC3446IDE#PBF IC REG TRPL BCK/LINEAR 14-DFN
LTC3537EUD#TRPBF IC REG DL BST/LINEAR SYNC 16-QFN
LTC3541EDD#TRPBF IC REG DL BCK/LINEAR SYNC 10-DFN
LTC3670EDDB#TRPBF IC REG TRPL BCK/LINEAR 12DFN
LTC3672BEDC-1#TRPBF IC REG TRPL BCK/LINEAR 8-DFN
相關代理商/技術參數
參數描述
LTC3446 制造商:LINER 制造商全稱:Linear Technology 功能描述:Monolithic Buck Regulator with Dual VLDO Regulators
LTC3446EDE 制造商:LINER 制造商全稱:Linear Technology 功能描述:Monolithic Buck Regulator with Dual VLDO Regulators
LTC3446EDE#PBF 功能描述:IC REG TRPL BCK/LINEAR 14-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓(降壓)同步(3),線性(LDO)(2) 功能:任何功能 輸出數:5 頻率 - 開關:300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅動器:無 帶監控器:無 帶序列發生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:*
LTC3446EDE#TRPBF 功能描述:IC REG TRPL BCK/LINEAR 14-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓(降壓)同步(3),線性(LDO)(2) 功能:任何功能 輸出數:5 頻率 - 開關:300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅動器:無 帶監控器:無 帶序列發生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:*
LTC3446EDE-PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:Monolithic Buck Regulator with Dual VLDO Regulators
主站蜘蛛池模板: 舞钢市| 社旗县| 亚东县| 财经| 长汀县| 崇阳县| 渝中区| 保康县| 伊金霍洛旗| 南澳县| 永州市| 辽阳市| 金沙县| 无为县| 靖边县| 枞阳县| 久治县| 新兴县| 马公市| 分宜县| 汉川市| 兴仁县| 津南区| 林口县| 靖江市| 凭祥市| 弥勒县| 三都| 新巴尔虎右旗| 潮州市| 吴川市| 汤原县| 竹北市| 张家川| 镇远县| 开封县| 通州市| 白水县| 芦溪县| 千阳县| 东平县|