- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44990 > LTC3411IMS (LINEAR TECHNOLOGY CORP) 2 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO10 PDF資料下載
參數(shù)資料
| 型號： | LTC3411IMS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大小： | 247K |
| 代理商： | LTC3411IMS |
LTC3411
16
3411fb
To avoid the LTC3411 from exceeding the maximum junc-
tion temperature, the user will need to do some thermal
analysis. The goal of the thermal analysis is to determine
whether the power dissipated exceeds the maximum
junction temperature of the part. The temperature rise is
given by:
TRISE = PD θJA
where PD is the power dissipated by the regulator and θJA
is the thermal resistance from the junction of the die to
the ambient temperature.
The junction temperature, TJ, is given by:
TJ = TRISE + TAMBIENT
As an example, consider the case when the LTC3411 is
in dropout at an input voltage of 3.3V with a load current
of 1A. From the Typical Performance Characteristics
graph of Switch Resistance, the RDS(ON) resistance of the
P-channel switch is 0.11Ω. Therefore, power dissipated
by the part is:
PD = I2 RDS(ON) = 110mW
The MS10 package junction-to-ambient thermal resistance,
θJA,willbeintherangeof100°C/Wto120°C/W.Therefore,
the junction temperature of the regulator operating in a
70°C ambient temperature is approximately:
TJ = 0.11 120 + 70 = 83.2°C
Remembering that the above junction temperature is
obtained from an RDS(ON) at 25°C, we might recalculate
the junction temperature based on a higher RDS(ON) since
it increases with temperature. However, we can safely as-
sume that the actual junction temperature will not exceed
the absolute maximum junction temperature of 125°C.
APPLICATIONS INFORMATION
Design Example
As a design example, consider using the LTC3411 in a por-
table application with a Li-Ion battery. The battery provides
a VIN = 2.5V to 4.2V. The load requires a maximum of 1A
in active mode and 10mA in standby mode. The output
voltage is VOUT = 2.5V. Since the load still needs power in
standby, Burst Mode operation is selected for good low
load efciency.
First, calculate the timing resistor:
R
MHz
k
T
=
()
=
9 78 10
1
323 8
11
108
.
Use a standard value of 324k. Next, calculate the inductor
value with 40% ripple current which is 500mA:
L
V
MHz
mA
V
H
=
=μ
25
1
500
1
25
42
2
.
.
Choosing the closest inductor from a vendor of 2.2μH,
results in a maximum ripple current of:
Δ=
μ
=
I
V
MHz
V
mA
L
25
12 2
1
25
42
460
.
.
For cost reasons, a ceramic capacitor will be used. COUT
selection is then based on load step droop instead of ESR
requirements. For a 5% output droop:
C
A
MHz
V
F
OUT
≈= μ
25
1
15
2 5
20
.
( % .
)
The closest standard value is 22μF. Since the output
impedance of a Li-Ion battery is very low, CIN is typically
10μF. In noisy environments, decoupling SVIN from PVIN
with an R6/C8 lter of 1Ω/0.1μF may help, but is typically
not needed.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3411IDD#TR | 2 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO10 |
| LTC3412AMPFE#TR | 6 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO16 |
| LTC3412AMPFE | 6 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO16 |
| LTC3412IFE#TR | 6.5 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO16 |
| LTC3412IFE | 6.5 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3411IMS#PBF | 功能描述:IC REG BUCK SYNC ADJ 10MSOP 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:- 設(shè)計資源: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 |
| LTC3411IMS#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 10MSOP 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:- 設(shè)計資源: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 |
| LTC3412 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:8A, 4MHz, Monolithic Synchronous Step-Down Regulator |
| LTC3412A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:3A, 4MHz, Monolithic Synchronous Step-Down Regulator |
| LTC3412AEFE | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.25V to 5.5V 16-Pin TSSOP EP |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。