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| 型号： | LT3689IUD-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/34页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 0.7A 16QFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 500kHz ~ 2MHz |
| 电流 - 输出： | 700mA |
| 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： | 16-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QFN-EP（3x3） |
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LT3689/LT3689-5
APPLICATIONS INFORMATION
Most applications running at V IN greater than 20V will
require a small phase lead capacitor, ranging from 2pF to
about 30pF, between the FB pin and V OUT for good transient
response. The circuits in the Typical Applications section
use the appropriate phase lead capacitors and are stable
at all input voltages.
If the output capacitor is different than the recommended
capacitor, stability should be checked across all operating
conditions, including load current, input voltage and tem-
perature. The LT1375 data sheet contains a more thorough
discussion of loop compensation and describes how to
test the stability using a transient load. Figure 4 shows
the transient response when the load current is stepped
from 360mA to 720mA and back to 360mA.
Low Ripple Burst Mode Operation and Pulse-Skipping
Mode
The LT3689 is capable of operating in either low ripple Burst
Mode operation or pulse-skipping mode, which is selected
using the SYNC pin. See the Synchronization section for
details. To enhance efficiency at light loads, the LT3689
can be operated in low ripple Burst Mode operation that
keeps the output capacitor charged to the proper voltage
while minimizing the input quiescent current. During Burst
Mode operation, the LT3689 delivers single cycle bursts of
current to the output capacitor followed by sleep periods
V OUT
50mV/DIV
I L
250mA/DIV
where the output power is delivered to the load by the
output capacitor. Because the LT3689 delivers power to the
output with single, low current pulses, the output ripple is
kept below 15mV for a typical application. The LT3689-5
has a slightly higher output ripple of 25mV. This higher
ripple can be reduced by using a larger output capacitor.
In addition, V IN and OUT quiescent currents are reduced
to typically 50μA and 75μA, respectively, during the sleep
time. As the load current decreases towards a no-load
condition, the percentage of time that the LT3689 operates
in sleep mode increases and the average input current is
greatly reduced, resulting in high efficiency even at very
low loads (see Figure 5).
At higher output loads (above approximately 60mA at
V IN = 12V for the front page application) the LT3689 will be
running at the frequency programmed by the R T resistor,
and will be operating in standard PWM mode. The transi-
tion between PWM and low ripple Burst Mode operation
is seamless, and will not disturb the output voltage. If low
quiescent current is not required, the LT3689 can oper-
ate in pulse-skipping mode. The benefit of this mode is
that the LT3689 will enter full frequency standard PWM
operation at a lower output load current than when in
Burst Mode operation. The front page application circuit
will switch at full frequency at output loads higher than
about 15mA at 12V IN .
V OUT
10mV/DIV
I L
0.2A/DIV
V SW
5V/DIV
10μs/DIV
3689 F04
5μs/DIV
3689 F05
V IN = 12V, FRONT PAGE APPLICATION
I LOAD = 8mA
Figure 4. Transient Load Response of the LT3689 Front
Page Application as the Load Current is Stepped from
360mA to 720mA. V OUT = 3.3V, V IN = 12V
Figure 5. Burst Mode Operation
3689fe
For more information www.linear.com/LT3689
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3689IUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:700mA Step-Down Regulator with Power-On Reset and Watchdog Timer |
| LT3689IUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:700mA Step-Down Regulator with Power-On Reset and Watchdog Timer |
| LT3690 | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 4A, 1.5MHz Synchronous Step-Down Switching Regulator |
| LT3690EUFE#PBF | 功能描述:IC REG BUCK SYNC ADJ 4A 26QFN 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 |
| LT3690EUFE#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 4A 26QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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