参数资料
| 型号： | LT3513EUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/22页 |
| 文件大小： | 0K |
| 描述： | IC REG 5-OUT FOR TFT-LCD 38QFN |
| 标准包装： | 52 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 4.5 V ~ 30 V |
| 输出数： | 5 |
| 输出电压： | 0.8 V ~ 40 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 供应商设备封装： | 38-QFN（5x7） |
| 包装： | 管件 |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LT3513
OPERATION
I D(AVG) = I OUT
ThelowESRandsmallsizeofceramiccapacitorsmake
them the preferred type for LT3513 applications. However,
not all ceramic capacitors are the same. Many of the higher
value capacitors use poor dielectrics with high temperature
and voltage coefficients. In particular, Y5V and Z5U types
lose a large fraction of their capacitance with applied volt-
age and at temperature extremes.
Because loop stability and transient response depend on
the value of C OUT , this loss may be unacceptable. Use
X7R and X5R types. Electrolytic capacitors are also an
option. The ESRs of most aluminum electrolytic capacitors
are too large to deliver low output ripple. Tantalum and
newer, lower ESR organic electrolytic capacitors intended
for power supply use are suitable, and the manufacturers
will specify the ESR. Chose a capacitor with a low enough
ESR for the required output ripple. Because the volume
of the capacitor determines its ESR, both the size and the
value will be larger than a ceramic capacitor that would
give similar ripple performance. One benefit is that the
larger capacitance may give better transient response
for large changes in load current. Table 2 lists several
capacitor vendors.
Table 2. Low ESR Surface Mount Capacitors
VENDOR TYPE SERIES
Taiyo Yuden Ceramic X5R, X7R
AVX Ceramic X5R, X7R
Tantalum TPS
Kemet Tantalum T491, T494, T495
Ta Organic T520
Al Organic A700
Sanyo Ta or Al Organic POSCAP
Panasonic Al Organic SP CAP
TDK Ceramic X5R, X7R
DIODE SELECTION
The catch diode (D1 from Figure 1) conducts current only
during switch-off time. Average forward current in normal
operation can be calculated from:
V IN – V OUT
V IN
The only reason to consider a diode with a larger current
rating than necessary for nominal operation is for the
worst-case condition of shorted output. The diode current
will then increase to the typical peak switch current. Peak
reverse voltage is equal to the regulator input voltage.
Use a diode with a reverse voltage rating greater than the
input voltage. Table 3 lists several Schottky diodes and
their manufacturers.
Table 3. Schottk y Diodes
PART NUMBER V R (V) I AVE (A) V FAT 1A (mV) V F at 2A (mV)
On Semiconducto r
MBRM120E 20 1 530
MBRM140 40 1 550
MBRS240 40 2
MBRA340 40 3 450
Diodes Inc.
B120 20 1 500
B240 40 2 500
B340A 40 3 450
BOOST PIN CONSIDERATIONS
The minimum operating voltage of an LT3513 applica-
tion is limited by the undervoltage lockout ~4V and by
the maximum duty cycle. The boost circuit also limits
the minimum input voltage for proper start-up. If the
input voltage ramps slowly or the LT3513 turns on when
the output is already in regulation, the boost capacitor
may not be fully charged. Because the boost capacitor
charges with the energy stored in the inductor, the circuit
will rely on some minimum load current to get the boost
circuit running properly. This minimum load will depend
on input and output voltages. The Typical Performance
Characteristics section shows a plot of the minimum load
current to start as a function of input voltage for a 3.3V
3513fc
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3513EUHF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2MHz High Current 5-Output Regulator for TFT-LCD Panels |
| LT3513IUHF#PBF | 功能描述:IC REG 5-OUT FOR TFT-LCD 38QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LT3513IUHF#TRPBF | 功能描述:IC REG 5-OUT FOR TFT-LCD 38QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LT3513IUHF-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2MHz High Current 5-Output Regulator for TFT-LCD Panels |
| LT3513IUHF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2MHz High Current 5-Output Regulator for TFT-LCD Panels |
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