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參數(shù)資料
| 型號： | LTC1434 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 450mA, Low Noise Current Mode Step-Down DC/DC Converters(450mA,低噪聲，脈寬調(diào)制電流型，步降DC/DC變換器) |
| 中文描述： | 四百五十○毫安，低噪聲電流模式降壓DC / DC轉(zhuǎn)換器（四百五十○毫安，低噪聲，脈寬調(diào)制電流型，步降直流/直流變換器） |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 317K |
| 代理商： | LTC1434 |
13
LTC1433/LTC1434
APPLICATIO
S I
FOR
ATIO
U
W
U
U
further reducing the current to 15
μ
A. The low side of the
resistive divider should connect to SGND.
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1433/LTC1434. These items are also illustrated graphi-
cally in the layout diagram of Figure 13. Check the follow-
ing in your layout:
1. Are the signal and power grounds segregated The
LTC1433/LTC1434 signal ground pin must return to
the (–) plate of C
OUT
. The power ground returns to the
anode of the Schottky diode and the (–) plate of C
IN
,
which should have as short lead lengths as possible.
2. Does the LTC1433/LTC1434 V
OSENSE
pin connect to the
(+) plate of C
OUT
In adjustable applications, the resis-
tive divider R1/R2 must be connected between the (+)
plate of C
OUT
and signal ground.
3. Does the (+) plate of C
IN
connect to the power V
IN
as
close as possible This capacitor provides the AC
current to the internal P-channel MOSFETs and their
drivers.
4. Is the Schottky diode closely connected between the
power ground and switch pin
5. Keep the switching nodes, SSW and BSW away from
sensitive small-signal nodes V
OSENSE
, PLLIN, PLL LPF,
C
OSC
, I
TH
and LBI.
Design Example
As a design example, assume V
IN
= 6V, V
OUT
= 5V, I
MAX
=
400mA and f
OSC
= 200kHz. With these requirements we
can start choosing all of the important components.
With no frequency synchronization required, the LTC1433
can be used for this circuit. From Figure 2, the V
PLL LPF
=
0V curve is used to determine the value of the oscillator
capacitor. From the graph a value of 50pF will provide the
desired frequency.
Next the inductor value is selected. From the Maximum
Output Current vs Input Supply graph in the Typical
Performance Characteristics section, a value of L = 22
μ
H
would be able to meet the requirement for the output load
current.
For the catch diode, a MBRS130LT3 is selected.
Figure 13. LTC1434 Layout Diagram (See Board Layout Check List)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
NC
SSW
NC
BSW
SGND
NC
RUN/SS
NC
LBO
LBI
PWRV
IN
PGND
SV
IN
PLLIN
PLL LPF
C
OSC
POR
I
TH
V
OSENSE
V
PROG
LTC1434
C
IN
C
SS
0.1
μ
F
OUTPUT DIVIDER REQUIRED
WITH ADJUSTABLE VERSION
ONLY. CONNECT V
TO V
FOR FIXED
OUTPUT VOLTAGE
V
OUT
C
OUT
D1
L1
1433/34 F13
C
OSC
+
+
BOLD LINES INDICATE HIGH CURRENT PATHS
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1434CGN | 功能描述:IC REG BUCK 3.3V/5V/ADJ 20SSOP 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:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC1434CGN#PBF | 功能描述:IC REG BUCK 3.3V/5V/ADJ 20SSOP 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:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| LTC1434CGN#TR | 功能描述:IC REG BUCK 3.3V/5V/ADJ 20SSOP 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:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC1434CGN#TRPBF | 功能描述:IC REG BUCK 3.3V/5V/ADJ 20SSOP 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:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| LTC1434IGN | 功能描述:IC REG BUCK 3.3V/5V/ADJ 20SSOP 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:- 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 |
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