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| 型号： | LT3682EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A 12DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 20 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 250kHz ~ 2.2MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 12-DFN |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LT3682
APPLICATIONS INFORMATION
Table 2. Capacitor Vendors
VENDOR
Panasonic
PHONE
(714) 373-7366
URL
www.panasonic.com
PART SERIES
Ceramic,
COMMENTS
EEF Series
Polymer,
Tantalum
Kemet
(864) 963-6300
www.kemet.com
Ceramic,
T494, T495
Tantalum
Sanyo
(408)749-9714
www.sanyovideo.com
Ceramic,
POSCAP
Polymer,
Tantalum
Murata
(408)436-1300
www.murata.com
Ceramic
AVX
www.avxcorp.com
Ceramic,
TPS Series
Tantalum
Taiyo Yuden
(864)963-6300
www.taiyo-yuden.com
Ceramic
I D ( AVG ) MAX = 2 A + ? ? 150 ns
When choosing a capacitor, look carefully through the
data sheet to ?nd out what the actual capacitance is under
operating conditions (applied voltage and temperature).
A physically larger capacitor, or one with a higher voltage
rating, may be required. High performance tantalum or
electrolytic capacitors can be used for the output capacitor.
Low ESR is important, so choose one that is intended for
use in switching regulators. The ESR should be speci?ed
by the supplier, and should be 0.05Ω or less. Such a
capacitor will be larger than a ceramic capacitor and will
have a larger capacitance, because the capacitor must be
large to achieve low ESR. Table 2 lists several capacitor
vendors.
Diode Selection
The catch diode (D1 from block diagram) conducts current
only during switch off time. Average forward current in
normal operation can be calculated from:
I D ( AVG ) = I OUT ?( 1 ? DC )
where DC is the duty cycle. The only reason to consider a
diode with larger current rating than necessary for nominal
operation is for the case of shorted or overloaded output
conditions. For the worst case of shorted output the diode
average current will then increase to a value that depends on
the following internal parameters: switch current limit, catch
diode (DA pin) current threshold and minimum on-time. The
1 V IN
2 L
Peak reverse voltage is equal to the regulator input voltage
if it is below the overvoltage protection threshold. This
feature keeps the switch off for V IN > OVLO (41V maxi-
mum). For inputs up to the maximum operating voltage
of 36V, use a diode with a reverse voltage rating greater
than the input voltage. If transients at the input of up to
60V are expected, use a diode with a reverse voltage rat-
ing only higher than the maximum OVLO of 41V. Table 3
lists several Schottky diodes and their manufacturers. If
operating at high ambient temperatures, consider using
a Schottky with low reverse leakage.
Audible Noise
Ceramic capacitors are small, robust and have very
low ESR. However, ceramic capacitors can sometimes
cause problems when used with the LT3682 due to their
piezoelectric nature. When in Burst Mode operation, the
LT3682’s switching frequency depends on the load current,
and at very light loads the LT3682 can excite the ceramic
capacitor at audio frequencies, generating audible noise.
Since the LT3682 operates at a lower current limit during
Burst Mode operation, the noise is typically very quiet. If
this is unacceptable, use a high performance tantalum or
electrolytic capacitor at the output.
worst case (taking maximum values for the above mentioned
parameters) is given by the following expression:
3682f
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3682EDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A Micropower Step-Down |
| LT3682IDD#PBF | 功能描述:IC REG BUCK ADJ 1A 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LT3682IDD#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 2.2MHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 2.2MHZ, DFN-12 |
| LT3682IDD#TRPBF | 功能描述:IC REG BUCK ADJ 1A 12DFN 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 |
| LT3682IDD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A Micropower Step-Down |
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