參數(shù)資料
型號(hào)： LT3579EUFD-1#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PQCC20
封裝： 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-20
文件頁數(shù)： 5/40頁
文件大?。?/td> 503K
代理商： LT3579EUFD-1#PBF
LT3579/LT3579-1
13
35791f
applicaTions inForMaTion
Figure 6. Boost Converter – The Component Values Given Are
Typical Values for a 1MHz, 5V to 12V Boost
BOOST CONVERTER COMPONENT SELECTION
OPTIONAL
VIN
5V
CIN
22F
RT
86.6k
COUT1
10F
RGATE
6.3k
RC
8k
CC
2.2nF
CF
47pF
CSS
0.1F
RFB
130k
VOUT
12V
1.7A
VIN
COUT
10F
L1
2.2H
D1
30V, 4A
SW1 SW2
GATE
VIN
RT
VC
FAULT
SHDN
FB
SS
GND
SYNC
CLKOUT
LT3579
35791 F06
100k
200k
M1
The LT3579 can be configured as a Boost converter as in
Figure 6. This topology allows for positive output voltages
that are higher than the input voltage. An external PMOS
(optional)drivenbytheGATEpinoftheLT3579canachieve
input or output disconnect during a FAULT event. A single
feedback resistor sets the output voltage. For output
voltages higher than 40V, see the Charge Pump topology
in the Charge Pump Aided Regulators section.
Table 1 is a step-by-step set of equations to calculate
component values for the LT3579 when operating as a
Boost converter. Input parameters are input and output
voltage, and switching frequency (VIN, VOUT and fOSC
respectively). RefertotheAppendixforfurtherinformation
on the design equations presented in Table 1.
Variable Definitions:
VIN = Input Voltage
VOUT = Output Voltage
DC = Power Switch Duty Cycle
fOSC = Switching Frequency
IOUT = Maximum Output Current
IRIPPLE = Inductor Ripple Current
RDSON_PMOS = RDSON of External PMOS (set to 0 if not
using PMOS)
Table 1. Boost Design Equations
PARAMETERS/EQUATIONS
Step 1:
Inputs
Pick VIN, VOUT, and fOSC to calculate equations below.
Step 2:
DC
DC
VOUT – VIN + 0.5V
VOUT + 0.5V – 0.27V
Step 3:
L1
LTYP =
VIN – 0.27V
(
) DC
fOSC 1.8A
LMIN =
VIN – 0.27V
(
) 2 DC – 1
(
)
4A
fOSC 1 – DC
(
)
LMAX =
VIN – 0.27V
(
) DC
fOSC 0.5A
(1)
(2)
(3)
Solve equations 1, 2, and 3.
Choose the higher value between LTYP and LMIN for L1.
L1 should never exceed LMAX.
Step 4:
IRIPPLE
IRIPPLE =
VIN – 0.27V
(
)DC
fOSC L1
Step 5:
IOUT
IOUT = 6A –
IRIPPLE
2
1– DC
(
)
Step 6:
D1
VR > VOUT ;IAVG > IOUT
Step 7:
COUT,
COUT1
COUT =COUT1 =
IOUT DC
fOSC 0.01VOUT –0.5IOUT RDSON_PMOS
(
)
Step 8:
CIN
CIN =CPWR +CVIN
CIN =
IRIPPLE
8 fOSC 0.005 VIN
+
6A
DC
40
fOSC 0.005 VIN
Step 9:
RFB
RFB =
VOUT – 1.215V
83.3A
Step 10:
RT
RT =
87.6
fOSC
–1; fOSC in MHz andRT in k
Step 11:
PMOS
Only needed for input or output disconnect. See PMOS
Selection in the Appendix for information on sizing the PMOS
and the biasing resistor, RGATE.
Note: The maximum design target for peak switch current is 6A and
is used in this table. The final values for COUT and CIN may deviate
from the above equations in order to obtain desired load transient
performance for a particular application.
相關(guān)PDF資料
PDF描述
LT3579EFE-1#TRPBF SWITCHING REGULATOR, PDSO20
LT3579IFE-1#PBF SWITCHING REGULATOR, PDSO20
LT3580MPMS8E#PBF 2.8 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO8
LT3580MPMS8E#TRPBF 2.8 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO8
LT3582EUD-12#PBF 0.72 A SWITCHING REGULATOR, PQCC16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT3579EUFD-1-TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection
LT3579EUFD-PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection
LT3579EUFD-TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection
LT3579IFE#PBF 功能描述:IC REG MULTI CONFIG SYNC 20TSSOP 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(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
LT3579IFE#TRPBF 功能描述:IC REG MULTI CONFIG SYNC 20TSSOP 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(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
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

*
*
*