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| 型号： | LT3509IDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/24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
and Z5U types lose a large fraction of their capacitance
with applied voltage and at temperature extremes. Because
loop stability and transient response depend on the value
of C OUT , this loss may be unacceptable. Use X7R and X5R
types.
The value of the output capacitor greatly affects the
transient response to a load step. It has to supply extra
current demand or absorb excess current delivery until
the feedback loop can respond. The loop response is
dependent on the error ampli?er transconductance, the
internal compensation capacitor and the feedback net-
work. Higher output voltages necessarily require a larger
feedback divider ratio. This will also reduce the loop gain
and slow the response time. Fortunately this effect can be
mitigated by use of a feed-forward capacitor, C PL , across
I LOAD
700mA
300mA
V OUT (AC)
50mV/DIV
the top feedback resistor. The small-signal model shown
in Figure 10 can be used to model this in a simulator or
to give insight to an empirical design. Figure 11 shows
some load step responses with differing output capacitors
and C PL combinations.
Input Capacitor
The input capacitor needs to supply the pulses of charge
demanded during the on time of the switches. Little total
capacitance is required as a few hundred millivolts of ripple
at the V IN pin will not cause any problems to the device.
When operating at 2MHz and 12V, 2μF will work well. At
the lowest operating frequency and/or at low input voltages
a larger capacitor such as 4.7μF is preferred.
I LOAD
700mA
300mA
V OUT (AC)
50mV/DIV
C OUT = 10μF
TIME 20μs/DIV
C OUT = 10μF
TIME 20μs/DIV
3509 F11
C PL = 0
C PL = 82pF
Figure 11. Transient Load Response with Different Combinations
of C OUT and C PL Load Current Step from 300mA to 700mA
R1 = 10k, R2 = 32.4k, V IN = 12V, V OUT = 3.3V, f SW = 2.0MHz
3509fc
17
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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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