参数资料
| 型号： | LT3513IUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/22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
V OUT + V F
DC MAX – V F + V SW
V IN(MIN) = 1.25V
V OUT + V F
L =
(~0.3Vatmaximumload).Thisleadstoaminimuminput
voltage of:
V IN(MIN) =
with DC MAX = 0.75.
The user defined undervoltage is set by a resistor divider
connected to the UVLO pin. The comparator pulls 3μA
from the pin when the UVLO pin is higher than 1.25V.
The hysteresis and minimum input voltage equations are
as follows:
V HYS = ( R2 + 2k ) ? 3.9μA
R1 + R2
R1
V IN
R2
UVLO
38
R1
3513 A1
INDUCTOR SELECTION AND MAXIMUM OUTPUT
CURRENT
A good first choice for the inductor value is:
1.8
where V F is the voltage drop of the catch diode (~0.4V)
and L is in μH. The inductor’s RMS current rating must be
greater than the maximum load current and its saturation
current should be at least 30% higher. For highest efficiency,
the series resistance (DCR) should be less than 0.1 Ω .
Table 1 lists several vendors and types that are suitable.
Table 1. Inductor Vendors
VENDOR URL PART SERIES TYPE
Coilcraft www.coilcraft.com MSS7341 Shielded
Murata www.murata.com LQH55D Open
TDK www.component.tdk.com SLF7045 Shielded
SLF10145 Shielded
Toko www.toko.com DC62CB Shielded
D63CB Shielded
D75C Shielded
D75F Open
Sumida www.sumida.com CR54 Open
CDRH74 Shielded
CDRH6D38 Shielded
CR75 Open
The optimum inductor for a given application may differ
from the one indicated by this simple design guide. A larger
value inductor provides a higher maximum load current,
and reduces the output voltage ripple. If your load is lower
than the maximum load current, then you can relax the
value of the inductor and operate with higher ripple cur-
rent. This allows you to use a physically smaller inductor
or one with a lower DCR resulting in higher efficiency. Be
aware that the maximum load current depends on input
voltage. A graph in the Typical Performance Characteris-
tics section of this data sheet shows the maximum load
current as a function of input voltage and inductor value
for V OUT = 3.3V. In addition, low inductance may result
in discontinuous mode operation, which further reduces
maximum load current. For details of maximum output
current and discontinuous mode operation, see Linear
Technology’s Application Note 44. Finally, for duty cycles
greater than 50% (V OUT /V IN > 0.5), a minimum induc-
tance is required to avoid subharmonic oscillations, see
Application Note 19.
3513fc
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LT3514EFE#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK ADJ 24-TSSOP 制造商:Linear Technology 功能描述:BUCK 350KHZ-2.2MHZ 3.2-36V 制造商:Linear Technology 功能描述:BUCK, 350KHZ-2.2MHZ, 3.2-36V, TSSOP-24 制造商:Linear Technology 功能描述:DC-DC CONV, BUCK, ADJ, 2.1MHZ, TSSOP-24, Primary Input Voltage:36V, No. of Outputs:3, Output Current:2A, No. of Pins:24, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited, Package / Case:24-TSSOP |
| LT3514EUFD#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK ADJ |
| LT3514EUFD#TRPBF | 制造商:Linear Technology 功能描述:IC REG BUCK ADJ |
| LT3514IFE#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK ADJ 24-TSSOP 制造商:Linear Technology 功能描述:BUCK 350KHZ-2.2MHZ 3.2-36V 制造商:Linear Technology 功能描述:BUCK, 350KHZ-2.2MHZ, 3.2-36V, TSSOP-24 制造商:Linear Technology 功能描述:DC-DC CONV, BUCK, ADJ, 2.1MHZ, TSSOP-24, Primary Input Voltage:36V, No. of Outputs:3, Output Current:2A, No. of Pins:24, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited, Package / Case:24-TSSOP 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, Triple Step-Down Switching Regulator with 100% Duty Cycle O |
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