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參數(shù)資料
| 型號(hào)： | LTC3409 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | DRAM |
| 英文描述： | 64 x 18 3.3-V asynchronous FIFO memory 56-SSOP 0 to 70 |
| 中文描述： | 600mA的低輸入電壓降壓穩(wěn)壓器x 3mm DFN封裝采用3mm |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大小： | 246K |
| 代理商： | LTC3409 |
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14
LTC3409
3409f
APPLICATIU
Design Example
As a design example, assume the LTC3409 is used in a
2-alkaline cell battery-powered application. The V
IN
will be
operating from a maximum of 3.2V down to about 1.8V.
The load current requirement is a maximum of 600mA 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 1.5V. With this information
we can calculate L using Equation 2:
W
U
U
L
f
I
V
V
V
L
OUT
OUT
IN
=
1
1
–
(2)
Substituting V
OUT
= 1.5V, V
IN
= 3.2V,
I
L
= 240mA and
f = 1.7MHz in Equation 2 gives:
L
MHz
mA
H
=
μ
1
1 7
.
240
1.
1 5
3 2
.
2 2
.
–
.
For best efficiency choose a 750mA or greater inductor
with less than 0.3
series resistance. C
IN
will require an
RMS current rating of at least 0.3A
I
LOAD(MAX)
/2 at
temperature.
For the feedback resistors, choose R2 = 133k. R1 can then
be calculated from Equation 2 at 191K. Figure 4 shows the
complete circuit along with its efficiency curve.
Table 2 below gives 1% resistor values for selected output
voltages.
V
OUT
0.85V
1.2V
1.5V
1.8V
R1
51.1k
127k
191k
255k
R2
133k
133k
133k
133k
V
FB
GND
V
IN
V
IN
SYNC
RUN
SW
MODE
LTC3409
L1
2.2
μ
H
R1
191k
C1
10pF
C
IN
4.7
μ
F
V
IN
1.6V TO 5.5V
R2
133k
3409 F04
V
1.5V
0.6A
C
OUT
10
μ
F
CER
L1: SUMIDA CDRH2D18/LD
Figure 4
LOAD CURRENT (mA)
30
E
90
100
20
10
80
50
70
60
40
0.1
10
100
1000
3409 F04b
0
1
1.8V
IN
3.2V
IN
2.5V
IN
Burst Mode Efficiency, 1.5V
OUT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3409A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600mA Low VIN Buck Regulator in 3mm × 3mm DFN |
| LTC3409AEDD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600mA Low VIN Buck Regulator in 3mm × 3mm DFN |
| LTC3409AEDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN 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 |
| LTC3409AEDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN 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 |
| LTC3409AIDD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600mA Low VIN Buck Regulator in 3mm × 3mm DFN |
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