- 您现在的位置：买卖IC网 > PDF目录14819 > LT3682EDD#PBF (Linear Technology)IC REG BUCK ADJ 1A 12DFN PDF资料下载
参数资料
| 型号： | LT3682EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/24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
Frequency Tradeoffs section). The minimum input voltage
due to duty cycle is:
even exceed the maximum current limit of the LT3682,
especially in those cases where the switch already operates
1 ? f SW OFF ( MIN )
V IN ( MIN ) =
t
V OUT + V D
? V D + V SW
at minimum on time. The circuitry monitoring the current
through the catch diode via the DA pin prevents the switch
from turning on again if the inductor valley current is above
I L ( PEAK ) = 2 A + ? t ON ( MIN )
whereV IN(MIN) istheminimuminputvoltage,andt OFF(MIN)
is the minimum switch off time (210ns). Note that higher
switching frequency will increase the minimum input
voltage. If a lower dropout voltage is desired, a lower
switching frequency should be used.
The maximum input voltage for LT3682 applications
depends on switching frequency, the Absolute Maximum
Ratings of the V IN and BOOST pins, and the operating
mode. The LT3682 can operate from continuous input
voltages up to 36V. Input voltage transients of up to
60V are also safely withstood. However, note that while
V IN >V OVLO (39V typical), the LT3682 will stop switching,
allowing the output to fall out of regulation.
For a given application where the switching frequency
and the output voltage are already ?xed, the maximum
input voltage that guarantees optimum output voltage
ripple for that application can be found by applying the
following expression:
1.6A nominal. In these cases, the inductor peak current is
therefore the maximum current limit of the LT3682 plus
the additional current overshoot during the turn off delay
due to minimum on time:
V IN ( MAX ) ? V OUTOL
L
where I L(PEAK) is the peak inductor current, V IN(MAX) is
the maximum expected input voltage, L is the inductor
value, t ON(MIN) is the minimum on time and V OUTOL is the
output voltage under the overload condition. The part is
robust enough to survive prolonged operation under these
conditions as long as the peak inductor current does not
exceed 3.5A. Inductor current saturation and excessive
junction temperature may further limit performance.
If the output is in regulation and no short-circuit, startup,
or overload events are expected, then input voltage tran-
sients of up to V OVLO are acceptable regardless of the
switching frequency. In this case, the LT3682 may enter
f SW ON ( MIN )
V IN ( MAX ) =
V D + V OUT
t
? V D + V SW
pulse skipping operation where some switching pulses
are skipped to maintain output regulation. In this mode
the output voltage ripple and inductor current ripple will
where V IN(MAX) is the maximum operating input voltage,
V OUT is the output voltage, V D is the catch diode drop
(~0.5V), V SW is the internal switch drop (~0.5V at max load),
f SW is the switching frequency (set by R T ), and t ON(MIN) is
the minimum switch on time (~150ns). Note that a higher
switching frequency will reduce the maximum operating
input voltage. Conversely, a lower switching frequency
will be necessary to achieve optimum operation at high
input voltages.
Special attention must be paid when the output is in start-
up, short-circuit, or other overload conditions. In these
be higher than in normal operation.
Input voltage transients above V OVLO and up to 60V can
be tolerated. However, since the part will stop switching
during these transients, the output will fall out of regulation
and the output capacitor may eventually be completely
discharged. This case must be treated then as a start-up
condition as soon as V IN returns to values below V OVLO
and the part starts switching again.
Inductor Selection and Maximum Output Current
A good ?rst choice for the inductor value is:
cases, the LT3682 tries to bring the output in regulation by
driving lots of current into the output load. During these
events, the inductor peak current might easily reach and
L = ( V OUT + V D ) ?
1.8
f SW
3682f
12
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3388EMSE-3#PBF | IC REG BUCK SYNC 50MA 10MSOP |
| LTC3631EMS8E#PBF | IC REG BUCK SYNC ADJ 0.1A 8MSOP |
| VI-JVM-EY-F4 | CONVERTER MOD DC/DC 10V 50W |
| LTC3388EDD-1#PBF | IC REG BUCK SYNC 50MA 10DFN |
| VI-JVM-EY-F3 | CONVERTER MOD DC/DC 10V 50W |
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 |
发布紧急采购，3分钟左右您将得到回复。