- 您现在的位置：买卖IC网 > PDF目录44986 > LT3689IUD-5#TRPBF (LINEAR TECHNOLOGY CORP) 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PQCC16 PDF资料下载
参数资料
| 型号： | LT3689IUD-5#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16 |
| 文件页数： | 13/32页 |
| 文件大小： | 2188K |
| 代理商： | LT3689IUD-5#TRPBF |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页当前第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页第31页第32页
LT3689/LT3689-5
20
3689fd
BST and OUT Pin Considerations
Capacitor C3 and the internal boost Schottky diode (see
the Block Diagram) are used to generate a boost voltage
that is higher than the input voltage. In most cases, a 0.1F
capacitor will work well. Figure 6 shows three ways to ar-
range the boost circuit. The BST pin must be more than
2.3V above the SW pin for best efficiency. For outputs of
3V and above, the standard circuit (Figure 6a) is best. For
outputs between 2.8V and 3V, use a 0.47F boost capaci-
tor. A 2.5V output presents a special case because it is
marginally adequate to support the boosted drive stage
while using the internal boost diode. For reliable BST pin
operation with 2.5V outputs, use a good external Schottky
diode (such as ON Semiconductor’s MBR0540), and a
0.47F boost capacitor (see Figure 6b). For lower output
voltages,theboostdiodecanbetiedtotheinput(Figure6c),
or to another supply greater than 2.8V. The circuit in
Figure 6a is more efficient because the BST pin current
and OUT pin quiescent current comes from a lower
voltage source. Ensure that the maximum voltage ratings
of the BST and OUT pins are not exceeded.
The minimum operating voltage of an LT3689 application
is limited by the minimum input voltage (3.7V) and by the
maximumdutycycle,asoutlinedintheMinimumOperating
Voltage Range section. For proper start-up, the minimum
input voltage is also limited by the boost circuit. If the input
voltage is ramped slowly, or the LT3689 is turned on with
its EN/UVLO pin when the output is already in regulation,
thentheboostcapacitormaynotbefullycharged.Because
the boost capacitor is charged with the energy stored in
the inductor, the circuit will rely on some minimum load
current to get the boost circuit running properly. This
minimum load will depend on input and output voltages,
and on the arrangement of the boost circuit. The minimum
load generally goes to zero once the circuit has started.
For lower start-up voltage, the boost diode can be tied to
VIN; however, this restricts the input range to one-half of
the absolute maximum rating of the BST pin.
APPLICATIONS INFORMATION
Figure 6. Three Circuits for Generating the Boost Voltage
VIN
BST
SW
OUT
VIN
VOUT
2.2F
C3
GND
LT3689
VIN
BST
SW
OUT
VIN
VOUT
2.2F
C3
D2
GND
LT3689
VIN
BST
SW
OUT
VIN
VOUT
2.2F
C3
GND
LT3689
3689 F06
(6a) For VOUT > 2.8V
(6b) For 2.5V < VOUT < 2.8V
(6c) For VOUT < 2.5V; VIN(MAX) = 30V
相关PDF资料 |
PDF描述 |
|---|---|
| LT3689IMSE-5#TRPBF | 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3692IUH#TRPBF | 5.8 A DUAL SWITCHING CONTROLLER, 2750 kHz SWITCHING FREQ-MAX, PQCC32 |
| LT3692IUH#PBF | 5.8 A DUAL SWITCHING CONTROLLER, 2750 kHz SWITCHING FREQ-MAX, PQCC32 |
| LT3692EUH#PBF | 5.8 A DUAL SWITCHING CONTROLLER, 2750 kHz SWITCHING FREQ-MAX, PQCC32 |
| LT3724MPFE#TR | SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, PDSO16 |
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 |
发布紧急采购，3分钟左右您将得到回复。