参数资料
型号: LTC3446EDE#PBF
厂商: Linear Technology
文件页数: 17/20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:
带监控器:
带序列发生器:
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
17
3446ff
applicaTions inForMaTion
in more stable characteristics and are usually more suit-
able for use as the output capacitor. The X7R type has
better stability across temperature, while the X5R is less
expensive and is available in higher values. In all cases,
the output capacitance should never drop below 0.4礔, or
instability or degraded performance may occur.
VLDO Output Short-Circuit Protection
The VLDO regulators have built-in short-circuit limiting.
During short-circuit conditions, internal circuitry automati-
cally limits the output current to approximately 760mA.
VLDO Regulator Soft-Start
Each VLDO regulator includes a soft-start feature to
prevent excessive current flow during start-up. When
the VLDO regulator is enabled, the soft-start circuitry
gradually increases the VLDO regulator reference voltage
from 0V to 0.4V over a period of about 600祍. There is a
short 700祍 delay from the time the part is enabled until
the LDO output starts to rise. Figure 5 shows the start-up
output waveform.
Figure 3. Ceramic Capacitor DC Bias Characteristics
Figure 4. Ceramic Capacitor Temperature Characteristics
Figure 5. VLDO Regulator Output Start-Up
DC BIAS VOLTAGE (V)
3446 F03
20
0
20
40
60
80
100
0
4
8    10
2
6
X5R
Y5V
BOTH CAPACITORS ARE 1礔,
10V, 0603 CASE SIZE
TEMPERATURE (癈)
50
100
80
60
40
20
X5R
Y5V
20
25   0    25   50
3446 F04
75
0
BOTH CAPACITORS ARE 1礔,
10V, 0603 CASE SIZE
1.5V VLDO OUTPUT
1.2V VLDO OUTPUT
0.5V/DIV
BOTH VLDO
ENABLES
5V/DIV
V
LVIN
 = 1.8V
V
IN
 = 3.6V
FRONT PAGE APPLICATION CIRCUIT
WITH 10mA RESISTOR LOADS ON
EACH VLDO OUTPUT
200祍/DIV
3446 F05
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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