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| 型号： | LTC3417AIFE-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 20TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.5MHz，600kHz ~ 4MHz |
| 电流 - 输出： | 1A，1.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-TSSOP-EP |
LTC3417A-1
OPERATION
Dropout Operation
When the input supply voltage decreases toward the output
voltage, the duty cycle increases to 100%. In this dropout
condition, the PMOS switch is turned on continuously with
the output voltage being equal to the input voltage minus
the voltage drops across the internal P-channel MOSFET
and inductor.
APPLICATIONS INFORMATION
A general LTC3417A-1 application circuit is shown in
Figure 4. External component selection is driven by the
load requirement, and begins with the selection of the
inductors L1 and L2. Once L1 and L2 are chosen, C IN ,
C OUT1 and C OUT2 can be selected.
Operating Frequency
Selection of the operating frequency is a tradeoff between
Low Supply Operation
The LTC3417A-1 incorporates an undervoltage lockout
circuit which shuts down the part when the input voltage
drops below about 2.07V to prevent unstable operation.
160
140
120
100
80
60
40
20
ef?ciency and component size. High frequency operation
allows the use of smaller inductor and capacitor values.
Operation at lower frequencies improves ef?ciency by
reducing internal gate charge losses but requires larger
inductance values and/or capacitance to maintain low
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
FREQUENCY (MHz)
3417A-1 F01
Figure 1. Frequency vs R T
output ripple voltage.
The operating frequency, f O , of the LTC3417A-1 is deter-
mined by pulling the FREQ pin to V IN for 1.5MHz opera-
f O(MAX) 6.67
V OUT
V IN(MAX)
( MHz )
tion or by connecting an external resistor from FREQ to
ground. The value of the resistor sets the ramp current
that is used to charge and discharge an internal timing
capacitor within the oscillator and can be calculated by
using the following equation:
The minimum frequency is limited by leakage and noise
coupling due to the large resistance of R T .
Inductor Selection
Although the inductor does not in?uence the operating
R T ≈
1.61? 10
f O
11
( Ω ) – 16.586k Ω
frequency, the inductor value has a direct effect on ripple
current. The inductor ripple current, Δ I L , decreases with
higher inductance and increases with higher V IN or
for 0.6MHz ≤ f O ≤ 4MHz. Alternatively, use Figure 1 to
V OUT .
1– OUT
select the value for R T .
The maximum operating frequency is also constrained
by the minimum on-time and duty cycle. This can be
I L =
V OUT
f O ? L
V
V IN
calculated as:
Accepting larger values of Δ I L allows the use of low induc-
tances, but results in higher output voltage ripple, greater
core losses and lower output current capability.
3417a1fa
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3417AIFE-2#PBF | 功能描述:IC REG BUCK SYNC ADJ DL 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3417AIFE-2#TRPBF | 功能描述:IC REG BUCK SYNC ADJ DL 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC3417AIFE-2-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator |
| LTC3417AIFE-2-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator |
| LTC3417AIFEPBF | 制造商:Linear Technology 功能描述:Conv DC-DC Dual Step-Down 5.5V TSSOP20EP |
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