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参数资料
| 型号： | LTC3446EDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/20页 |
| 文件大小： | 283K |
| 描述： | IC REG TRPL BCK/LINEAR 14-DFN |
| 标准包装： | 91 |
| 拓扑： | 降压（降压）同步（1），线性（LDO）（2） |
| 功能： | 任何功能 |
| 输出数： | 3 |
| 频率 - 开关： | 2.25MHz |
| 电压/电流 - 输出 1： | 可调至0.8V，1A |
| 电压/电流 - 输出 2： | 可调至0.4V，300mA |
| 电压/电流 - 输出 3： | 可调至0.4V，300mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 0.9 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-DFN-EP（4x3） |
| 包装： | 管件 |
| 产品目录页面： | 1334 (CN2011-ZH PDF) |
LTC3446
4
3446ff
elecTrical characTerisTics
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3446 is tested under pulsed load conditions such that
T
J
H T
A
. The LTC3446E is guaranteed to meet performance specifications
from 0癈 to 85癈 operating junction temperature. Specifications over
the 40癈 to 125癈 operating junction temperature range are assured by
design characterization and correlation with statistical process controls.
The LTC3446I is guaranteed to meet performance specifications over
the 40癈 to 125癈 operating junction temperature range. Note that the
maximum ambient temperature consistent with these specifications is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors. The junction temperature (T
J
, in 癈) is calculated from the ambient
temperature (T
A
, in 癈) and power dissipation (P
D
, in Watts) according to
the formula:
T
J
= T
A
+ (P
D
" ?/DIV>
JA
)
where ?/DIV>
JA
(in 癈/W) is the package thermal impedance.
Note 3: Minimum operating V
IN
voltage required for the VLDO regulators
to stay in regulation is:
V
IN
e LV
OUT(MAX)
+ 1.4V and V
IN
e 2.7V
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: The LTC3446 is tested in a feedback loop that connects the
BUCKFB pin to the output of the buck converters error amplifier (i.e., the
I
TH
pin).
Note 6: Minimum operating LV
IN
voltage required for the VLDO regulators
to stay in regulation is:
LV
IN
e L
VOUT(MAX)
+ 100mV and LV
IN
e 0.9V
Note 7: Operating conditions are limited by maximum junction
temperature. The regulated output voltage specification will not apply
for all possible combinations of input voltage and output current. When
operating at maximum input voltage, the output current range must be
limited. When operating at maximum output current, the input voltage
range must be limited.
Note 8: PGOOD assertion indicates that the feedback voltages of all
enabled supplies are within the specified percentage of their target values.
Note 9: Dropout voltage in the DFN package is assured by design,
characterization and statistical process control.
Buck Regulated Feedback Voltage
vs Temperature
LDO1 Regulated Feedback
Voltage vs Temperature
LDO2 Regulated Feedback
Voltage vs Temperature
TEMPERATURE (癈)
50
800
802
804
110
3446 G01
798
796
792
10 30 70
30
130
10 50 90
794
808
806
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.5V
TEMPERATURE (癈)
50
400
402
404
110
3446 G02
398
396
392
10
30
70
30
130
10
50
90
394
408
406
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.5V
TEMPERATURE (癈)
50
400
402
404
110
3446 G03
398
396
392
10 30 70
30
130
10 50 90
394
408
406
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.5V
Typical perForMance characTerisTics
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3446EDE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Buck Regulator with Dual VLDO Regulators |
| LTC3446IDE | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Buck Regulator with Dual VLDO Regulators |
| LTC3446IDE#PBF | 功能描述:IC REG TRPL BCK/LINEAR 14-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LTC3446IDE#TRPBF | 功能描述:IC REG TRPL BCK/LINEAR 14-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LTC3446IDE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Buck Regulator with Dual VLDO Regulators |
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