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参数资料
| 型号： | LTC3525ESC6-3#TRMPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.45 A SWITCHING REGULATOR, PDSO6 |
| 封装： | LEAD FREE, PLASTIC, MO-203AB, EIAJ, SC-70, 6 PIN |
| 文件页数： | 14/14页 |
| 文件大小： | 536K |
| 代理商： | LTC3525ESC6-3#TRMPBF |
LTC3525-3/
LTC3525-3.3/LTC3525-5
9
3525fb
which point it turns off and the cycle repeats. When the
output voltage reaches its regulated value both switches
are turned off and the LTC3525 goes to sleep, during
which time the output capacitor supplies current to the
load. Once the output voltage drops approximately 9mV
below the regulation value the IC leaves sleep mode and
switching is resumed.
The LTC3525 has been designed for low output voltage
ripple. The output voltage ripple is typically only 20mV
peak-to-peak at light load and 60mV peak-to-peak at
full load using the minimum recommended 10F output
capacitor for the LTC3525-3.3 and a 22F capacitor for
the LTC3525-5 (due to the capacitor’s DC bias effect). An
antiring circuit damps any oscillation at the switch node
when the inductor current falls to zero.
Power Adjust Feature
The LTC3525 incorporates a feature that maximizes
efficiency at light load while providing increased power
capability at heavy load by adjusting the peak and valley
of the inductor current as a function of load. Lowering the
peak inductor current to 150mA at light load optimizes
efficiency by reducing conduction losses in the internal
MOSFETswitches.Astheloadincreases,thepeakinductor
currentisautomaticallyincreasedtoamaximumof400mA.
At intermediate loads, the peak inductor current may vary
from 150mA to 400mA. Figure 2 shows an example of
how the inductor current changes as the load increases.
Please note that output capacitor values greater than 47F
will result in higher peak currents than necessary at light
load. This will lower the light load efficiency.
The valley of the inductor current is automatically adjusted
as well, to maintain a relatively constant inductor ripple
current. This keeps the switching frequency relatively
constant.
The maximum average load current that can be supported
is given by:
I
V
Amps
OMAX
IN
O
() =
03
.
η
where
η is the efficiency (see Typical Performance Char-
acteristics).
The “burst” frequency (how often the LTC3525 delivers
a burst of current pulses to the load) is determined by
the internal hysteresis (output voltage ripple), the load
current and the amount of output capacitance. All Burst
Mode operation or hysteretic converters will enter the
audible frequency range when the load is light enough.
However, due to the low peak inductor current at light
load, circuits using the LTC3525 do not typically generate
any audible noise.
Figure 2. Inductor Current Changing as a Function of Load
OPERATION
3525 F02
INDUCTOR
CURRENT
100mA/DIV
LOAD
CURRENT
50mA/DIV
10s/DIV
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3525ESC6-5 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 0.85V to 4.5V 6-Pin SC-70 |
| LTC3525ESC6-5#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 0.85V to 4.5V 6-Pin SC-70 制造商:Linear Technology 功能描述:DC-DC CONVERTER BOOST 5V 175mA SC-70 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BOOST, 5V, 175mA, SC-70 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, Cut Tape 400mA Synch, Boost Converter in SC70 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BOOST, 5V, 175mA, SC-70-6, Primary Input Voltage:4.5V, No. of Outputs:1, Output Voltage:5V, Output Current:175mA, No. of Pins:6, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes |
| LTC3525ESC6-5#TR | 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, 400mA Synch, Boost Converter in SC70 |
| LTC3525ESC6-5#TRM | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 0.85V to 4.5V 6-Pin SC-70 T/R |
| LTC3525ESC6-5#TRMPBF | 功能描述:IC REG BOOST SYNC 5V 0.4A SC70-6 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 |
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