- 您现在的位置：买卖IC网 > PDF目录1825 > LT3690MPUFE#TRPBF (Linear Technology)IC REG BUCK SYNC ADJ 4A 26QFN PDF资料下载
参数资料
| 型号： | LT3690MPUFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 26QFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 20 V |
| 输入电压： | 3.9 V ~ 36 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 138kHz ~ 1.5MHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 是 |
| 工作温度： | -55°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 26-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 26-QFN-EP（4x6） |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页
LT3690
APPLICATIONS INFORMATION
(
)
L = V OUT + V LS ?
L MIN = ( V OUT + V LS ) ?
( 1 ? DC ) ( V OUT + V LS )
( L ? ? SW )
I SW(PK) = I L(PK) = I OUT +
InductorSelectionandMaximumOutputCurrent
A good first choice for the inductor value is:
0.67MHz
? SW
where V LS is the voltage drop of the low side switch
(0.12V), ? SW is in MHz, 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 0.03Ω. Table 2 lists several
vendors and types that are suitable.
Table 2. Inductor Vendors
VENDOR URL PART SERIES
Murata www.murata.com LQH6P
TDK www.tdk.com CLF10040T
SLF10165T
Toko www.toko.com DEM8045C
FDVE1040
Coilcraft www.coilcraft.com MSS1048
Sumida www.sumida.com CDRH8D43
CDRH105R
Vishay www.vishay.com IHLP-2525EZ
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 if the inductance differs from the simple rule
above, then the maximum load current will depend on input
voltage. In addition, low inductance may result in discon-
tinuous mode operation, which further reduces maximum
load current. For details of maximum output current and
discontinuous mode operation, see Application Note 44.
Finally, for duty cycles greater than 50% (V OUT /V IN > 0.5),
a minimum inductance is required to avoid sub-harmonic
oscillations:
0.42MHz
? SW
where V LS is the voltage drop of the low side switch (0.12V
at maximum load), ? SW is in MHz, and L MIN is in μH.
The current in the inductor is a triangle wave with an average
value equal to the load current. The peak switch current
is equal to the output current plus half the peak-to-peak
inductor ripple current. The LT3690 limits its switch cur-
rent in order to protect itself and the system from overload
faults. Therefore, the maximum output current that the
LT3690 will deliver depends on the switch current limit,
the inductor value, and the input and output voltages.
When the switch is off, the potential across the inductor
is the output voltage plus the low side switch drop. This
gives the peak-to-peak ripple current in the inductor:
? I L =
where ? SW is the switching frequency of the LT3690 and L
is the value of the inductor. The peak inductor and switch
current is:
? I L
2
To maintain output regulation, this peak current must be
less than the LT3690’s switch current limit I LIM . See the
Typical Performance graphs for the change in current
limit vs duty cycle.
Choosing an inductor value so that the ripple current is
small will allow a maximum output current near the switch
current limit.
3690fa
14
相关PDF资料 |
PDF描述 |
|---|---|
| LT3692IUH#TRPBF | IC REG BUCK ADJ 3.5A DL 32QFN |
| LT3693IMSE#TRPBF | IC REG BUCK ADJ 3.5A 10MSOP |
| LT3695HMSE-5#TRPBF | IC REG BUCK 5V 1A 16MSOP |
| LT3710EFE#TRPBF | IC REG CTRLR BUCK PWM 16-TSSOP |
| LT3724EFE#PBF | IC REG CTRLR BST INV PWM 16TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3692 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Dual Tracking |
| LT3692A | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Dual Tracking |
| LT3692AEFE#PBF | 功能描述:IC REG BUCK ADJ 3.5A DL 38TSSOP 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 |
| LT3692AEFE#TRPBF | 功能描述:IC REG BUCK ADJ 3.5A DL 38TSSOP 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 |
| LT3692AEUH#PBF | 功能描述:IC REG BUCK ADJ 3.5A DL 32QFN 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 |
发布紧急采购，3分钟左右您将得到回复。