參數(shù)資料
型號(hào)： LTC3404IMS8#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 1.5 A SWITCHING REGULATOR, 1650 kHz SWITCHING FREQ-MAX, PDSO8
封裝： LEAD FREE, PLASTIC, MSOP-8
文件頁(yè)數(shù)： 14/16頁(yè)
文件大小： 204K
代理商： LTC3404IMS8#TRPBF
7
LTC3404
3404fb
+
–
+
–
+
–
+
–
+
–
OVDET
EA
+
–
IRCMP
+
–
ICOMP
8
7
3
1
RUN
PLL LPF
VCO
X
Y
Y = “0” ONLY WHEN X IS A CONSTANT “1”
BURST
DEFEAT
SLOPE
COMP
OSC
SYNC/MODE
0.6V
FREQ
SHIFT
VREF
0.8V
0.85V
Ω
gm = 0.5m
0.8V REF
SHUTDOWN
0.55V
0.8V
SLEEP
VIN
ITH
SLEEP
VFB
EN
BURST
VIN
2
S
R
RS LATCH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
Q
6
Ω
6
SW
5
GND
3404 BD
4
P-CH
N-CH
FU CTIO AL DIAGRA
U
W
OPERATIO
U
Main Control Loop
The LTC3404 uses a constant frequency, current mode
step-down architecture. Both the main (P-channel MOS-
FET) and synchronous (N-channel MOSFET) switches are
internal. During normal operation, the internal top power
MOSFET is turned on each clock cycle when the oscillator
sets the RS latch, and turned off when the current com-
parator, ICOMP, resets the RS latch. The peak inductor
current at which ICOMP resets the RS latch is controlled by
the voltage on the ITH pin, which is the output of error
amplifier EA. The VFB pin, described in the Pin Functions
section, allows EA to receive an output feedback voltage
from an external resistive divider. When the load current
increases, it causes a slight decrease in the feedback
voltage, VFB, relative to the 0.8V internal reference, which
in turn, causes the ITH voltage to increase until the average
inductor current matches the new load current. While the
top MOSFET is off, the bottom MOSFET is turned on until
either the inductor current starts to reverse as indicated by
the current reversal comparator IRCMP, or the beginning of
the next clock cycle.
Comparator OVDET guards against transient overshoots
>6.25% by turning the main switch off and keeping it off
until the fault is removed.
Burst Mode Operation
The LTC3404 is capable of Burst Mode operation in which
the internal power MOSFETs operate intermittently based
on load demand. To enable Burst Mode operation, simply
tie the SYNC/MODE pin to VIN or connect it to a logic high
(VSYNC/MODE> 1.5V). To disable Burst Mode operation and
enable PWM pulse skipping mode, connect the SYNC/
MODE pin to GND. In this mode, the efficiency is lower at
light loads, but becomes comparable to Burst Mode
operation when the output load exceeds 50mA. The ad-
vantage of pulse skipping mode is lower output ripple and
less interference to audio circuitry.
相關(guān)PDF資料
PDF描述
LTC3406ABES5#PBF 1.3 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO5
LTC3406ABES5#TRM 1.3 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO5
LTC3406ABES5#TR 1.3 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO5
LTC3406B-2ES5#PBF 1.3 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO5
LTC3406BES5-1.2#PBF 1.3 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO5
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3404MPMS8 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.65V to 6V 8-Pin MSOP
LTC3404MPMS8#PBF 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT
LTC3404MPMS8#TR 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.65V to 6V 8-Pin MSOP T/R
LTC3405 制造商:LINEAR 制造商全稱:LINEAR 功能描述:Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN
LTC3405A 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.5MHz, 300mA Synchronous Step-Down Regulator in ThinSOT
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*