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| 型号： | LTC3536IMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC ADJ 12MSOP |
| 标准包装： | 37 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.8 V ~ 5.5 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | 电压模式，混合 |
| 频率 - 开关： | 300kHz ~ 2MHz |
| 电流 - 输出： | 1A |
| 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： | 12-TSSOP （0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 12-MSOP，裸露焊盘 |
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LTC3536
APPLICATIONS INFORMATION
reducing the peak current to be closer to the average out-
put current and therefore minimize resistive losses due to
high RMS currents. However, a larger inductor within any
given inductor family will generally have a greater series
resistance, thereby counteracting this efficiency advantage.
An inductor used in LTC3536 applications should have a
saturation current rating that is greater than the worst-case
average inductor current plus half the ripple current. The
peak-to-peak inductor current ripple for each operational
mode can be calculated from the following formula, where
f is the switching frequency in MHz, L is the inductance
in μH.
accordingly in order to have the same current ripple
(2.2μH for 2MHz, 15μH for 300kHz).
Different inductor core materials and styles have an impact
on the size and price of an inductor at any given current
rating. Shielded construction is generally preferred as it
minimizes the chances of interference with other circuitry.
The choice of inductor style depends upon the price, sizing,
and EMI requirements of a particular application. Table 1
provides a small sampling of inductors that are well suited
to many LTC3536 applications.
Table 1. Recommended Inductor s
VENDOR PART/STYLE
? I L(P-P)(BUCK) = OUT ? IN
? I L(P-P)(BOOST) = IN ? OUT
f ? L ?
V OUT
?
V ? V – V OUT ?
?
f ? L ? V IN ?
V ? V – V IN ?
?
In addition to its influence on power conversion efficiency,
the inductor DC resistance can also impact the maximum
output capability of the buck-boost converter particularly
at low input voltages. In buck mode, the output current of
the buck-boost converter is limited only by the inductor
current reaching the current limit threshold. However, in
boost mode, especially at large step-up ratios, the output
current capability can also be limited by the total resistive
losses in the power stage. These include switch resis-
tances, inductor resistance and PCB trace resistance. Use
of an inductor with high DC resistance can degrade the
output current capability from that shown in the Typical
Performance Characteristics section of this data sheet.
As a guideline, in most applications the inductor DC re-
sistance should be significantly smaller than the typical
power switch resistance of 120mΩ.
Coilcraft
847-639-6400
www.coilcraft.com
Coiltronics
www.cooperet.com
Murata
714-852-2001
www.sumida.com
Sumida
847-956-0666
www.sumida.com
Taiyo Yuden
www.t-yuden.com
TDK
847-803-6100
www.component.tdk.com
Würth Elektronik
201-785-8800
www.we-online.com
Output Capacitor Selection
LPO2506
LPS4012, LPS4018
MSS6122
MSS4020
MOS6020
DS1605, DO1608
XPL4020
XAL4040
XFL4020
SD52, SD53
SD3114, SD311B
LQH55D
CDH40D11
NP04S8
NR3015
NR4018
VLP, LTF
VLF, VLCF
WE-TPC Type S, M, MH
The minimum inductor value must guarantee that the
worst-case average input current plus half the ripple
current don’t reach the input current limit threshold.
For a switching frequency of 1MHz the recommended
typical inductor value is 4.7μH. For a higher and lower
switching frequency the inductor value should be changed
A low ESR output capacitor should be utilized at the buck-
boost converter output in order to minimize output voltage
ripple. Multilayer ceramic capacitors are an excellent option
as they have low ESR and are available in small footprints.
The capacitor value should be chosen large enough to
reduce the output voltage ripple to acceptable levels.
3536fa
13
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| LTC3537 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO |
| LTC3537EUD#PBF | 功能描述:IC REG DL BST/LINEAR SYNC 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LTC3537EUD#TRPBF | 功能描述:IC REG DL BST/LINEAR SYNC 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LTC3537EUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO |
| LTC3537EUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO |
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