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| 型号： | LT3509IDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.7A DL 14DFN |
| 标准包装： | 91 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 35.3 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 260kHz ~ 2.15MHz |
| 电流 - 输出： | 700mA |
| 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： | 14-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 14-DFN-EP（4x3） |
LT3509
APPLICATIONS INFORMATION
Boost Pin Considerations
Figure 7 through Figure 9 show several ways to arrange
the boost circuit. The BOOST pin must be more than 2V
above the SW pin for full ef?ciency. For outputs of 3.3V
and higher, the standard circuit Figure 7 is best. For lower
output voltages, the boost diode can be tied to the input
In any case, be sure that the maximum voltage at the
BOOST pin is less than 60V and the voltage difference
between the BOOST and SW pins is less than 30V.
Inductor Selection and Maximum Output Current
A good ?rst choice for the inductor value is:
Figure 8. The circuit in Figure 7 is more ef?cient because
the boost pin current comes from a lower voltage source.
Finally, as shown in Figure 9, the BD pin can be tied to
L = ( V OUT + V F ) ?
2.1MHz
f SW
another source that is at least 3V. For example, if you are
generating 3.3V and 1.8V, and the 3.3V is on whenever
the 1.8V is on, the 1.8V boost diode can be connected to
the 3.3V output.
where V F is the voltage drop of the catch diode (~0.5V)
and L is in μH.
The inductor’s RMS current rating must be greater than the
maximum load current and its saturation current should
V IN
V IN
BD
BOOST
C BOOST
be at least 30% higher. For highest ef?ciency, the series
resistance (DCR) should be less than 0.15Ω. Table 2 lists
several vendors and types that are suitable.
C IN
LT3509
GND
SW
DA
D1
L1
V OUT
C OUT
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 LT3509 limits its switch current
3509 F07
in order to protect itself and the system from overcurrent
V BOOST – V SW
MAX V BOOST
V OUT 3V
V OUT
V IN V OUT
faults. Therefore, the maximum output current that the
LT3509 will deliver depends on the switch current limit,
the inductor value and the input and output voltages.
Figure 7. BD Tied to Regulated Output
V IN
BD
V IN
BOOST
C BOOST
V BD
V IN
BD
V IN
BOOST
LT3509
C BOOST
L1
C IN
LT3509
GND
SW
DA
D1
L1
V OUT
C OUT
C IN
GND
SW
DA
D1
V OUT
C OUT
3509 F09
3509 F08
V BOOST – V SW
V BD
V BOOST – V SW
MAX V BOOST
V IN
2V IN
MAX V BOOST
V BD
3V
V IN
V BD
Figure 8. Supplied from V IN
Figure 9. Separate Boost Supply
3509fc
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3509IDE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 36V, 700mA Step-Down Regulator |
| LT3509IMSE#PBF | 功能描述:IC REG BUCK ADJ 0.7A DL 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 |
| LT3509IMSE#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 2.2MHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 2.2MHZ, MSOP-16 |
| LT3509IMSE#TRPBF | 功能描述:IC REG BUCK ADJ 0.7A DL 16MSOP 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 |
| LT3509IMSE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 36V, 700mA Step-Down Regulator |
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