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参数资料
| 型号： | LTC3525DESC6-3.3 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.45 A SWITCHING REGULATOR, PDSO6 |
| 封装： | PLASTIC, MO-203AB, SC-70, 6 PIN |
| 文件页数： | 10/12页 |
| 文件大小： | 220K |
| 代理商： | LTC3525DESC6-3.3 |
LTC3525D-3.3
7
3525d33f
OPERATIO
U
Normal Operation
Once VOUT has increased more than 0.2V typical above
VIN, and either voltage is above 1.8V, normal operation
begins, with synchronous rectication enabled. In this
mode, the internal N-channel MOSFET connected be-
tween SW and GND stays on until the inductor current
reaches a maximum peak value, after which it is turned
off and the P-channel synchronous rectier is turned
on. It stays on, delivering current to the output, until the
inductor current has dropped below a minimum value at
which point it turns off and the cycle repeats. When the
output voltage reaches its regulated value both switches
are turned off and the LTC3525D 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 LTC3525D 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. An anti-ring circuit damps any oscillation at the
switch node when the inductor current falls to zero.
Power Adjust Feature
The LTC3525D incorporates a feature that maximizes
efciency 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
efciency by reducing conduction losses in the internal
MOSFET switches. As the load increases, the peak inductor
current is automatically increased to a maximum of 400mA.
At intermediate loads, the peak inductor current may vary
from 150mA to 400mA. Figure 1 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 efciency.
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.
3525 F01
INDUCTOR
CURRENT
100mA/DIV
LOAD
CURRENT
50mA/DIV
10
s/DIV
Figure 1. Inductor Current Changing as a Function of Load
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3525ESC6-3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:400mA Micropower Synchronous Step-Up DC/DC Converter with Output Disconnect |
| LTC3525ESC6-3#PBF | 制造商:Linear Technology 功能描述:IC SYNC STEP-UP DC/DC CONVERTER SC70-6 制造商:Linear Technology 功能描述:IC, SYNC STEP-UP DC/DC CONVERTER, SC70-6 制造商:Linear Technology 功能描述:IC, SYNC STEP-UP DC/DC CONVERTER, SC70-6; Primary Input Voltage:1.2V; No. of Outputs:1; Output Voltage:3V; Output Current:400mA; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:85C; MSL:MSL 1 - Unlimited ;RoHS Compliant: Yes |
| LTC3525ESC6-3#TRMPBF | 功能描述:IC REG BOOST SYNC 3V 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 |
| LTC3525ESC6-3#TRPBF | 功能描述:IC REG BOOST SYNC 3V 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:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3525ESC6-3.0 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 0.85V to 4.5V 6-Pin SC-70 |
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