- 您现在的位置：买卖IC网 > PDF目录44986 > LT3686AIDD#TRPBF (LINEAR TECHNOLOGY CORP) 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 PDF资料下载
参数资料
| 型号： | LT3686AIDD#TRPBF |
| 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： | 5/30页 |
| 文件大小： | 504K |
| 代理商： | LT3686AIDD#TRPBF |
第1页第2页第3页第4页当前第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页
LT3686A
13
3686afa
The SYNC/MODE pin is used to synchronize the internal
oscillator with an external square wave. The synchroniz-
ing clock signal to the LT3686A should be below 2.5MHz
with pulse width of at least 200ns on and off time, a low
state below 0.4V and a high state above 0.8V. The SYNC
frequency must be higher than the RT programmed fre-
quency; see Table 1.
The inductor value should be chosen based on the RT
frequency rather than the highest synchronization fre-
quency.
The SYNC/MODE pin doubles as mode select for the
BD active load circuit. The active load is enabled when
SYNC/MODE is driven with clock pulses or tied greater
than 0.8V and disabled when SYNC/MODE is tied below
0.4V. 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. For small
size, the inductor can be chosen according to:
L
=
2(VOUT+VD)
f
ApplicAtions inForMAtion
Usingasmallervalueinductorwillincreaseinductorcurrent
ripple and reduce the VIN voltage at which the active load
can keep the LT3686A at full switching frequency.
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. Finally, for duty cycles greater than
50% (VOUT/VIN > 0.5), there is a minimum inductance
required to avoid subharmonic oscillations. See Linear
Technology Application Note 19.
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 LT3686A 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 LT3686A 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
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 x 4.5
5.5 x 5.5
8.3 x 8.3
Toko
www.toko.com
A916CY
D585LC
2 to 12
1.1 to 39
6.3 x 6.2
8.1 x 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 x 4.8
5.2 x 5.8
7.3 x 7.3
相关PDF资料 |
PDF描述 |
|---|---|
| LT3686EDD#PBF | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| LT3686IDD#TRPBF | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| LT3688IFE#TRPBF | SWITCHING REGULATOR, PDSO24 |
| LT3688EUF#PBF | SWITCHING REGULATOR, PQCC24 |
| LT3688IFE#PBF | SWITCHING REGULATOR, PDSO24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3686AIMSE#PBF | 功能描述:IC REG BUCK ADJ 1.2A 12MSOP 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 |
| LT3686AIMSE#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 12MSOP 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 |
| LT3686EDD | 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 |
| LT3686EDD#PBF | 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 |
| LT3686EDD#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 |
发布紧急采购，3分钟左右您将得到回复。