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参数资料
| 型号： | LT3686EDD#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件页数： | 5/28页 |
| 文件大小： | 509K |
| 代理商： | LT3686EDD#PBF |
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LT3686
13
3686fc
The MODE pin serves as mode select for the BD active
load circuit. The active load is enabled when MODE is
tied high and disabled when MODE is tied low. See Fixed
Frequency at Light Load section.
Inductor Selection and Maximum Output Current
A good first choice for the inductor value is:
L
=
4(VOUT + VD)
f
where VD is the voltage drop of the catch diode (~0.4V), L
is in μH, frequency is in MHz. With this value there will be
no subharmonic oscillation. The inductor’s RMS current
rating must be greater than the maximum load current
and its saturation current should be about 30% higher. For
robust operation during fault conditions, the saturation
current should be above 2A. To keep efficiency high, the
series resistance (DCR) should be less than 0.1Ω. Table
2 lists several vendors and types that are suitable.
There are several graphs in the Typical Performance
Characteristics section of this data sheet that show the
maximum load current as a function of input voltage and
inductor value for several popular output voltages. Low
inductance may result in discontinuous mode opera-
tion, which is okay, but further reduces maximum load
current. For details of the maximum output current and
discontinuous mode operation, see Linear Technology
Application Note 44.
ApplicAtions inForMAtion
Catch Diode
A low capacitance 1-2A Schottky diode is recommended
for the catch diode, D1. The diode must have a reverse
voltage rating equal to or greater than the maximum input
voltage. The MBRM140 is a good choice; it is rated for
1A continuous forward current and a maximum reverse
voltage of 40V.
Input Capacitor
Bypass the input of the LT3686 circuit with a 2.2μF or
higher value ceramic capacitor of X7R or X5R type. Y5V
types have poor performance over temperature and ap-
plied voltage and should not be used. A 2.2μF ceramic is
adequate to bypass the LT3686 and will easily handle the
ripple current. However, if the input power source has
high impedance, or there is significant inductance due to
long wires or cables, additional bulk capacitance may be
necessary. This can be provided with a low performance
electrolytic capacitor. Step-down regulators draw current
from the input supply in pulses with very fast rise and
fall times. The input capacitor is required to reduce the
resulting voltage ripple at the LT3686 and to force this very
high frequency switching current into a tight local loop,
minimizing EMI. A 2.2μF capacitor is capable of this task,
but only if it is placed close to the LT3686 and the catch
diode (see the PCB Layout section). A second precaution
regarding the ceramic input capacitor concerns the maxi-
mum input voltage rating of the LT3686. A ceramic input
capacitor combined with trace or cable inductance forms
Table 2
VENDOR
URL
PART SERIES
INDUCTANCE RATE (H)
SIZE (mm)
Sumida
www.sumida.com
CDRH4D28
CDRH5D28
CDRH8D28
1.2 to 4.7
2.5 to 10
2.5 to 33
4.5
× 4.5
5.5
× 5.5
8.3
× 8.3
Toko
www.toko.com
A916CY
D585LC
2 to 12
1.1 to 39
6.3
× 6.2
8.1
× 8
Würth Elektronik
www.we-online.com
WE-TPC(M)
WE-PD2(M)
WE-PD(S)
1 to 10
2.2 to 22
1 to 27
4.8
× 4.8
5.2
× 5.8
7.3
× 7.3
相关PDF资料 |
PDF描述 |
|---|---|
| LT3686IDD#TRPBF | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3686EDDTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:37V/1.2A Step-Down Regulator in 3mm × 3mm DFN |
| LT3686HDD#PBF | 功能描述:IC REG BUCK ADJ 1.2A 10-DFN 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 |
| LT3686HDD#PBF | 制造商:Linear Technology 功能描述:IC PWM STEP-DOWN DC/DC CONVERTER DFN10 制造商:Linear Technology 功能描述:IC, PWM STEP-DOWN DC/DC CONVERTER, DFN10 |
| LT3686HDD#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3686IDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:37V/1.2A Step-Down Regulator in 3mm × 3mm DFN |
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