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LTC1265CS#TRPBF

更新时间： 2024-01-26 06:13:10
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
16页 230K
描述
LTC1265 - 1.2A, High Efficiency Step-Down DC/DC Converter; Package: SO; Pins: 14; Temperature Range: 0°C to 70°C

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LTC1265CS#TRPBF 技术参数

是否无铅：含铅是否Rohs认证：符合
生命周期：Active包装说明：SOP,
针数：14Reach Compliance Code：compliant
风险等级：5.68Is Samacsys：N
模拟集成电路 - 其他类型：SWITCHING REGULATOR控制模式：CURRENT-MODE
控制技术：CONSTANT OFF TIME最大输入电压：12 V
最小输入电压：5.4 V标称输入电压：10 V
JESD-30 代码：R-PDSO-G14JESD-609代码：e3
长度：8.65 mm湿度敏感等级：1
功能数量：1端子数量：14
最高工作温度：85 °C最低工作温度：-40 °C
最大输出电流：1.2 A封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装形状：RECTANGULAR
封装形式：SMALL OUTLINE峰值回流温度（摄氏度）：260
认证状态：Not Qualified座面最大高度：1.75 mm
表面贴装：YES切换器配置：BUCK
最大切换频率：700 kHz温度等级：INDUSTRIAL
端子面层：Matte Tin (Sn)端子形式：GULL WING
端子节距：1.27 mm端子位置：DUAL
处于峰值回流温度下的最长时间：30宽度：3.9 mm
Base Number Matches：1

LTC1265CS#TRPBF 数据手册

 浏览型号LTC1265CS#TRPBF的Datasheet PDF文件第4页浏览型号LTC1265CS#TRPBF的Datasheet PDF文件第5页浏览型号LTC1265CS#TRPBF的Datasheet PDF文件第6页浏览型号LTC1265CS#TRPBF的Datasheet PDF文件第8页浏览型号LTC1265CS#TRPBF的Datasheet PDF文件第9页浏览型号LTC1265CS#TRPBF的Datasheet PDF文件第10页 
LTC1265/LTC1265-3.3/LTC1265-5  
U
W U U  
APPLICATIONS INFORMATION  
Under short-circuit condition, the peak inductor current is  
determined by:  
2V, the LTC1265 reduces tOFF by increasing the discharge  
current in CT. This prevents audible operation prior to  
dropout. (See shelving effect shown in the Operating  
Frequency curve under Typical Performance Character-  
istics.)  
150mV  
I
=
(Amps)  
SC(PK)  
R
SENSE  
In this condition, the LTC1265 automatically extends the  
off time of the P-channel MOSFET to allow the inductor  
current to decay far enough to prevent any current build-  
up. The resulting ripple current causes the average short-  
To maintain continuous inductor current at light load, the  
inductor must be chosen to provide no more than 25mV/  
RSENSE of peak-to-peak ripple current. This results in the  
following expression for L:  
circuit current to be approximately IOUT(MAX)  
.
L ≥ 5.2(105)RSENSE(CT)VREG  
CT and L Selection for Operating Frequency  
Using an inductance smaller than the above value will  
result in the inductor current being discontinuous. A  
consequenceofthisisthattheLTC1265willdelayentering  
Burst Mode operation and efficiency will be degraded at  
low currents.  
The LTC1265 uses a constant off-time architecture with  
tOFF determined by an external capacitor CT. Each time the  
P-channel MOSFET turns on, the voltage on CT is reset to  
approximately 3.3V. During the off time, CT is discharged  
by a current that is proportional to VOUT. The voltage on CT  
is analogous to the current in inductor L, which likewise,  
decays at a rate proportional to VOUT. Thus the inductor  
value must track the timing capacitor value.  
Inductor Core Selection  
With the value of L selected, the type of inductor must be  
chosen. Basically, there are two kinds of losses in an  
inductor; core and copper losses.  
The value of CT is calculated from the desired continuous  
mode operating frequency:  
Core losses are dependent on the peak-to-peak ripple  
current and core material. However it is independent of  
the physical size of the core. By increasing the induc-  
tance, the peak-to-peak inductor ripple current will de-  
crease, therefore reducing core loss. Utilizing low core  
loss material, such as molypermalloy or Kool Mµ® will  
allow user to concentrate on reducing copper loss and  
preventing saturation.  
V – V  
V + V  
IN  
1
IN  
OUT  
D
C =  
T
(Farads)  
)
)
4
1.3(10 )f  
where VD is the drop across the Schottky diode.  
As the operating frequency is increased, the gate charge  
losses will reduce efficiency. The complete expression for  
operating frequency is given by:  
Although higher inductance reduces core loss, it in-  
creases copper loss as it requires more windings. When  
space is not at a premium, larger wire can be used to  
reduce the wire resistance. This also prevents excessive  
heat dissipation.  
V – V  
V + V  
IN  
1
OFF  
IN  
OUT  
D
(Hz)  
f ≈  
)
)
t
where:  
V
V
REG  
OUT  
CATCH DIODE SELECTION  
4
(sec)  
t
= 1.3(10 )C  
OFF  
T
)
)
Losses in the catch diode depend on forward drop and  
switching times. Therefore Schottky diodes are a good  
choice for low drop and fast switching times.  
VREG is the desired output voltage (i.e. 5V, 3.3V). VOUT is  
the measured output voltage. Thus VREG/VOUT = 1  
in regulation.  
The catch diode carries load current during the off time.  
The average diode current is therefore dependent on the  
Note that as VIN decreases, the frequency decreases.  
When the input-to-output voltage differential drops below  
Kool Mµ is a registered trademark of Magnetics, Inc.  
7
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