- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44991 > LTC3525DESC6-3.3#PBF (LINEAR TECHNOLOGY CORP) 0.45 A SWITCHING REGULATOR, PDSO6 PDF資料下載
參數(shù)資料
| 型號： | LTC3525DESC6-3.3#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.45 A SWITCHING REGULATOR, PDSO6 |
| 封裝： | LEAD FREE, PLASTIC, MO-203AB, EIAJ, SC-70, 6 PIN |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 477K |
| 代理商： | LTC3525DESC6-3.3#PBF |
LTC3525D-3.3
7
3525d33fa
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 rectification 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 rectifier 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
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
Characteristics).
The “burst” frequency (how often the LTC3525D 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 LTC3525D does not typically generate
any audible noise.
Figure 2. Inductor Current Changing as a Function of Load
OPERATION
3525d33 F02
INDUCTOR
CURRENT
100mA/DIV
LOAD
CURRENT
50mA/DIV
10s/DIV
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3525LESC6-3TRM | 0.45 A SWITCHING REGULATOR, PDSO6 |
| LTC3525LESC6-3 | 0.45 A SWITCHING REGULATOR, PDSO6 |
| LTC3526BEDC-2 | 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3526EDC | 0.5 A SWITCHING CONTROLLER, 1300 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3526BEDC | 0.5 A SWITCHING CONTROLLER, 1300 kHz SWITCHING FREQ-MAX, PDSO6 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3525ESC6-3 | 制造商:LINER 制造商全稱: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 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC3525ESC6-3#TRPBF | 功能描述:IC REG BOOST SYNC 3V 0.4A SC70-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝: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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。