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| 型号： | LT3510IFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A DL 20TSSOP |
| 标准包装： | 74 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 23.8 V |
| 输入电压： | 3.1 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 250kHz ~ 1.5MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 20-TSSOP-EP |
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LT3510
APPLICATIONS INFORMATION
maximum duty cycle. The duty cycle is the fraction of time
that the internal switch is on during a clock cycle. Unlike
most ?xed frequency regulators, the LT3510 will not switch
off at the end of each clock cycle if there is suf?cient volt-
age across the boost capacitor (C3 in Figure 1) to fully
saturate the output switch. Forced switch off for a minimum
time will only occur at the end of a clock cycle when the
boost capacitor needs to be recharged. This operation
has the same effect as lowering the clock frequency for a
?xed off time, resulting in a higher duty cycle and lower
6.0
5.5
5.0
4.5
4.0
3.5
3.0
V OUT = 3.3V
START-UP
RUNNING
minimum input voltage. The resultant duty cycle depends
on the charging times of the boost capacitor and can be
1
10
100 1000
CURRENT (mA)
10000
3510 F03
DC MAX =
1 +
V IN(MIN) = OUT
– V D + V SW
DC MAX =
= 98%
1 +
approximated by the following equation:
1
1
B
where B is 2A divided by the typical boost current from
the Electrical Characteristics.
This leads to a minimum input voltage of:
V + V D
DC MAX
Figure 3. Minimum Input Voltage vs Load Current
Example:
V OUT = 3.3V, I OUT = 1A, Frequency = 1MHz, Temperature
= 25°C
V SW = 0.1V, B = 40 (from boost characteristics speci?ca-
tion), V D = 0.4V, t ON(MIN) = 200ns
1
1
40
where V SW is the voltage drop of the internal switch.
Figure 3 shows a typical graph of minimum input voltage
V IN(MIN) =
3.3 + 0.4
0.98
– 0.4 + 0.1 = 3.48V
vs load current for the 3.3V and 1.8V application on the
?rst page of this data sheet. The maximum input voltage
DC MIN = t MIN(ON) ? f = 0.200
is determined by the absolute maximum ratings of the V IN
and BST pins and by the frequency and minimum duty
cycle. The minimum duty cycle is de?ned as :
V IN(MAX) =
3.3 + 0.4
0.200
– 0.4 + 0.1 = 18.2V
V IN(MAX) = OUT
– V D + V SW
( V IN – V OUT ) ? V OUT
DC MIN = t ON(MIN) ? Frequency
Maximum input voltage as:
V + V D
DC MIN
Note that the LT3510 will regulate if the input voltage is
taken above the calculated maximum voltage as long as
maximum ratings of the V IN and BST pins are not violated.
However operation in this region of input voltage will exhibit
pulse skipping behavior.
Inductor Selection and Maximum Output Current
A good ?rst choice for the inductor value is:
L =
V IN ?f
where f is frequency in MHz and L is in μH.
With this value the maximum load current will be ~2A,
independent of input voltage. The inductor’s RMS current
3510fe
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3510IFE-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Dual Tracking 2A Step-Down Switching Regulator |
| LT3510IFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Dual Tracking 2A Step-Down Switching Regulator |
| LT3511 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic High Voltage Isolated Flyback Converter No External Start-Up Resistor |
| LT3511EMS#PBF | 功能描述:IC REG FLYBACK ISOLATD 16-MSOP 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 |
| LT3511EMS#TRPBF | 功能描述:IC REG FLYBK ISO ADJ .24A 16MSOP 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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