參數(shù)資料
型號(hào)： LTC3405AES6
英文描述： Analog IC
中文描述： 模擬IC
文件頁數(shù)： 12/16頁
文件大?。?/td> 239K
代理商： LTC3405AES6
12
LTC3405A
3405af
APPLICATIOU
W
U
U
1. The power traces, consisting of the GND trace, the SW
trace and the V
IN
trace should be kept short, direct and
wide.
2. Does the V
FB
pin connect directly to the feedback
resistors The resistive divider R1/R2 must be con-
nected between the (+) plate of C
OUT
and ground.
3. Does the (+) plate of C
IN
connect to V
IN
as closely as
possible This capacitor provides the AC current to the
internal power MOSFETs.
4. Keep the (–) plates of C
IN
and C
OUT
as close as possible.
5. Keep the switching node, SW, away from the sensitive
V
FB
node.
Design Example
As a design example, assume the LTC3405A is used in a
single lithium-ion battery-powered cellular phone
application. The V
IN
will be operating from a maximum of
4.2V down to about 2.7V. The load current requirement
is a maximum of 0.25A but most of the time it will be in
standby mode, requiring only 2mA. Efficiency at both low
and high load currents is important. Output voltage is
2.5V. With this information we can calculate L using
equation (1),
Figure 6. LTC3405A Suggested Layout
L
f
I
V
V
V
L
OUT
OUT
IN
=
( )
(
)
1
1
(3)
Substituting V
OUT
= 2.5V, V
IN
= 4.2V,
I
L
= 100mA and
f = 1.5MHz in equation (3) gives:
L
V
100
(
MHz
mA
V
V
H
=
μ
2 5
.
1 5
.
1
2 5
4 2
.
6 8
.
)
.
For best efficiency choose a 300mA or greater inductor
with less than 0.3
series resistance.
C
IN
will require an RMS current rating of at least 0.125A
I
LOAD(MAX)
/2 at temperature and C
OUT
will require an ESR
of less than 0.5
. In most cases, a ceramic capacitor will
satisfy this requirement.
For the feedback resistors, choose R1 = 412k. R2 can
then be calculated from equation (2) to be:
R
V
R
k use
;
OUT
0 8
.
2
1 1 875.
=
87k
Figure 7 shows the complete circuit along with its effi-
ciency curve.
LTC3405A
GND
3405A F06
PIN 1
V
OUT
V
IN
VIA TO V
OUT
SW
VIA TO V
IN
VIA TO GND
C
OUT
C
IN
L1
R2
C
FWD
R1
相關(guān)PDF資料
PDF描述
LTC5502A1P12 Optoelectronic
LTC5612ELM Optoelectronic
LTC612A1G Optoelectronic
LTC656TP Optoelectronic
LTC667A1G12 Optoelectronic
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3405AES6#PBF 制造商:Linear Technology 功能描述:IC DC-DC CONV 1.5 MHz 6-SOT-23 制造商:Linear Technology 功能描述:BUCK 0.3A 1.8V 1.5MHZ 6TSOT23 制造商:Linear Technology 功能描述:IC, DC-DC CONV, 1.5 MHz, 6-SOT-23 制造商:Linear Technology 功能描述:IC, DC-DC CONV, 1.5 MHz, 6-SOT-23; Primary Input Voltage:5.5V; No. of Outputs:1; Output Voltage:800mV; Output Current:300mA; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:85C; MSL:MSL 1 - Unlimited ;RoHS Compliant: Yes
LTC3405AES6#TR 功能描述:IC REG BUCK SYNC ADJ .3A SOT23-6 RoHS:否 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
LTC3405AES6#TRM 功能描述:IC REG BUCK SYNC ADJ .3A SOT23-6 RoHS:否 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
LTC3405AES6#TRMPBF 功能描述:IC REG BUCK SYNC ADJ .3A SOT23-6 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:- 產(chǎn)品培訓(xùn)模塊:High Efficiency Current Mode Switching Regulators CMOS LDO Regulators 特色產(chǎn)品:BD91x Series Step-Down Regulators 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):2 輸出電壓:3.3V，0.8 V ~ 2.5 V 輸入電壓:4.5 V ~ 5.5 V PWM 型:電流模式 頻率 - 開關(guān):1MHz 電流 - 輸出:1.5A 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:20-VFQFN 裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:VQFN020V4040 產(chǎn)品目錄頁面:1373 (CN2011-ZH PDF) 其它名稱:BD9152MUV-E2TR
LTC3405AES6#TRPBF 功能描述:IC REG BUCK SYNC ADJ .3A SOT23-6 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
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。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。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

我的聯(lián)系方式

*
*
*