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參數(shù)資料
| 型號(hào)： | LT1610 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1.7MHz, Single Cell Micropower DC/DC Converter |
| 中文描述： | 為1.7MHz，單細(xì)胞微功率DC / DC變換器 |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大?。?/td> | 209K |
| 代理商： | LT1610 |
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9
LT1610
APPLICATIO
S I
FOR
ATIO
U
W
U
U
V
200mV/DIV
I
500mA/DIV
SWITCH
VOLTAGE
10V/DIV
100ns/DIV
1610 F07
Figure 7. Switching Waveforms Without Ceramic Capacitor C5
V
50mV/DIV
I
500mA/DIV
SWITCH
VOLTAGE
10V/DIV
V
= 4.1V
LOAD = 100mA
100ns/DIV
1610 F08
Figure 8. Switching Waveforms with Ceramic Capacitor C5.
Note the 50mV/DIV Scale for V
OUT
Figure 6. 4-Cell Alkaline to 5V/120mA SEPIC DC/DC Converter
It is best to choose the compensation components empiri-
cally. Once the power components have been chosen
(based on size, efficiency, cost and space requirements),
a working circuit is built using conservative (or merely
guessed) values of R
C
and C
C
. Then the response of the
circuit is observed under a transient load, and the compen-
sation network is modified to achieve stable operation.
Linear Technology’s Application Note 19 contains a de-
tailed description of the method. A good starting point for
the LT1610 is C
C
~ 220pF and R
C
~ 220k.
All Ceramic, Low Profile Design
Large value ceramic capacitors that are suitable for use as
the main output capacitor of an LT1610 regulator are now
available. These capacitors have very low ESR and there-
fore offer very low output ripple in a small package.
However, you should approach their use with some
caution.
Ceramic capacitors are manufactured using a number of
dielectrics, each with different behavior across tempera-
ture and applied voltage. Y5V is a common dielectric used
for high value capacitors, but it can lose more than 80% of
the original capacitance with applied voltage and extreme
temperatures. The transient behavior and loop stability of
the switching regulator depend on the value of the output
capacitor, so you may not be able to afford this loss. Other
dielectrics (X7R and X5R) result in more stable character-
istics and are suitable for use as the output capacitor. The
X7R type has better stability across temperature, whereas
the X5R is less expensive and is available in higher values.
The second concern in using ceramic capacitors is that
many switching regulators benefit from the ESR of the
SHUTDOWN
C2
22
μ
F
6.3V
C1
22
μ
F
6.3V
L1
22
μ
H
L2
22
μ
H
C3
1
μ
F
CERAMIC
D1
V
OUT
5V
120mA
1610 F06
+
+
C4
1
μ
F
CERAMIC
1M
324k
C1, C2: ALUMINUM ELECTROLYTIC
C3 TO C5: CERAMIC X7R OR X5R
D1: MBR0520
L1, L2: MURATA LQH3C220 OR SUMIDA CLS62-220
C5
1
μ
F
CERAMIC
6
5
2
3
4
7
8
1
V
IN
SW
PGND
FB
SHDN
GND
COMP
LT1610
V
C
4 CELLS
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| LT1610CMS8 | 功能描述:IC REG BOOST ADJ 0.6A 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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 |
| LT1610CMS8#PBF | 功能描述:IC REG BOOST ADJ 0.6A 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 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 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):2MHz 電流 - 輸出:500mA 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:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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