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参数资料
| 型号： | LTC3564IS5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ TSOT23-5 |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 1.25A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-5 |
LTC3564
APPLICATIO S I FOR ATIO
V OUT ? 1 ? OUT ?
L =
( f ) ( Δ I L )
?
V IN ?
? ? 1 ? 4 . 2 V ? ? = 0 . 9 μ H
2.5V ? 2 . 5 V ?
R 2 = ? OUT ? 1 ? R 1 = 1000 k
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC3564. These items are also illustrated graphically in
Figures 4 and 5. Check the following in your layout:
1. The power traces, consisting of the GND trace, the SW
trace and the V IN trace should be kept short, direct and
wide.
2. Does the V FB pin connect directly to the feedback
resistors? The resistive divider R1/R2 must be con-
nected between the (+) plate of C OUT and ground.
3. Does the (+) plate of C IN connect to V IN as closely as
possible? This capacitor provides the AC current to the
internal power MOSFETs.
4. Keep the switching node, SW, away from the sensitive
V FB node.
5. Keep the (–) plates of C IN and C OUT as close as possible.
Design Example
As a design example, assume the LTC3564 is used in a
single lithium-ion battery-powered cellular phone
application. The V IN will be operating from a maximum of
4.2V down to about 2.7V. The load current requirement
is a maximum of 1.25A 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
2.5V. With this information we can calculate L using
equation (1),
1 ? V ?
(3)
Substituting V OUT = 2.5V, V IN = 4.2V, Δ I L = 500mA and
f = 2.25MHz in equation (3) gives:
L=
2.25MHz(500mA)
A 1 μ H or 1.1 μ H inductor works well for this application.
For best efficiency choose a 1.5A or greater inductor with
less than 0. 1 Ω series resistance.
C IN will require an RMS current rating of at least 0.6A ?
I LOAD(MAX) /2 at temperature and C OUT will require an ESR
of less than 0.125 Ω . In most cases, a ceramic capacitor
will satisfy this requirement.
For the feedback resistors, choose R1 = 316k. R2 can
then be calculated from equation (2) to be:
? V ?
? 0 . 6 ?
Figure 6 shows the complete circuit along with its effi-
ciency curve.
100
95
90
V IN
2.7V
TO 4.2V
C IN **
22 μ F
CER
3
V IN SW
LTC3564
4
1.1 μ H*
22pF
V OUT
2.5V
C OUT **
22 μ F
8 5
8 0
75
5
RUN
GND
2
V FB
1
1M
316k
CER
70
65
60
V OUT = 2.5V
V IN = 2.7V
V IN = 3.6V
V IN = 4.2V
3564 F06a
0.1
1
10 100
1000
*TOKO A915AY-1R1M (D53LC SERIES)
** TAIYO YUDEN JMK316BJ226ML
Figure 6a. Typical Application
OUTPUT CURRENT (mA)
3564 F06b
Figure 6b. Efficiency vs Output Current
3564f
15
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相关代理商/技术参数 |
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| LTC3565 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.25A, 4MHz, Synchronous Step-Down DC/DC Converter |
| LTC3565_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.25A, 4MHz, Synchronous Step-Down DC/DC Converter |
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| LTC3565EDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 1.25A 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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