- 您现在的位置：买卖IC网 > PDF目录44993 > LTC3812IFE-5 (LINEAR TECHNOLOGY CORP) 1 A SWITCHING CONTROLLER, PDSO16 PDF资料下载
参数资料
| 型号： | LTC3812IFE-5 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, PDSO16 |
| 封装： | 4.40 MM, PLASTIC, TSSOP-16 |
| 文件页数： | 5/32页 |
| 文件大小： | 425K |
| 代理商： | LTC3812IFE-5 |
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页第31页第32页
LTC3812-5
13
38125fb
The four possible operating modes for generating this
supply are summarized as follows (see Figure 4):
1. LTC3812-5 generates a 5.5V start-up supply from a small
external SOT-23 NMOS acting as linear regulator with
drain connected to VIN and gate controlled by the
LTC3812-5’s internal linear regulator controller through
the NDRV pin. As soon as the output voltage reaches
4.7V, the 5.5V IC/driver supply is derived from the
output through an internal low dropout regulator to
optimize efciency. If the output is lost due to a short,
the LTC3812-5 goes through repeated low duty cycle
soft-start cycles (with the drivers shut off in between)
to attempt to bring up the output without burning up
the SOT-23 NMOS. This scheme eliminates the long
start-up times associated with a conventional trickle
charger by using an external NMOS to quickly charge
the IC/driver supply capacitor (CINTVCC).
2. Similar to (1) except that the external NMOS is used
for continuous IC/driver power instead of just for start-
up. The NMOS is sized for proper dissipation and the
driver shutdown/restart for VOUT < 4.7V is disabled.
This scheme is less efcient but may be necessary if
VOUT < 4.7V and a boost network is not desired.
3. Trickle charge mode provides an even simpler approach
by eliminating the external NMOS. The IC/driver supply
capacitors are charged through a single high valued
resistor connected to the input supply. When the INTVCC
voltage reaches the turn-on threshold of 9V (automati-
cally raised from 4.2V to provide extra headroom for
start-up), the drivers turn on and begin charging up the
output capacitor. When the output reaches 4.7V, IC/driver
power is derived from the output. In trickle-charge mode,
the supply capacitors must have sufcient capacitance
such that they are not discharged below the 4V INTVCC
UV threshold before the output is high enough to take
over or else the power supply will not start.
4. Low voltage supply available. The simplest approach is if
a low voltage supply (between 4.2V and 14V) is available
and connected directly to the IC/driver supply pins.
Figure 4. Operating Modes for IC/Driver Supply
OPERATION
NDRV
EXTVCC
INTVCC
VOUT (> 4.7V)
VIN
I < 270μA
VOUT
Mode 1: MOSFET for Start-Up Only
Mode 2: MOSFET for Continuous Use
Mode 3: Trickle Charge Mode
Mode 4: External Supply
5.5V
4.2V TO
14V
38125 F04
NDRV
EXTVCC
INTVCC
NDRV
EXTVCC
INTVCC
NDRV
EXTVCC
INTVCC
VIN
I > 270μA
5.5V
+
VIN
5.5V
+
LTC3812-5
+
–
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3831IGN | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| LTC3833IUDC#PBF | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC3833EFE#TRPBF | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO20 |
| LTC3833EUDC#TRPBF | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC3833EUDC#PBF | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PQCC20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3812IFE-5#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3812IFE-5#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3813EG#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3813EG#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3813IG#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
发布紧急采购，3分钟左右您将得到回复。