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参数资料
| 型号： | LTC3810IG#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO28 |
| 封装： | 5.30 MM, PLASTIC, SSOP-28 |
| 文件页数： | 6/36页 |
| 文件大小： | 495K |
| 代理商： | LTC3810IG#TR |
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LTC3810
14
3810fb
is < 6.7V or an external supply in the appropriate range
can be used. The LTC3810 will automatically detect which
mode is being used and operate properly.
The four possible operating modes for generating this
supply are summarized as follows (see Figure 4):
1. LTC3810 generates a 10V start-up supply from a small
external SOT23 N-channel MOSFET acting as linear
regulator with drain connected to VIN and gate controlled
by the LTC3810’s internal linear regulator controller
through the NDRV pin. As soon as the output voltage
reaches 6.7V, the 10V 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 LTC3810 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 SOT23 MOSFET. This scheme eliminates the long
start-up times associated with a conventional trickle
charger by using an external MOSFET to quickly charge
the IC/driver supply capacitors (CINTVCC, CDRVCC).
2.Similar to (1) except that the external MOSFET is used
for continuous IC/driver power instead of just for
start-up. The MOSFET is sized for proper dissipation and
the driver shutdown/restart for VOUT< 6.7V is disabled.
This scheme is less efcient but may be necessary if
VOUT < 6.7V and a boost network is not desired.
3. Trickle charge mode provides an even simpler approach
by eliminating the external MOSFET. The IC/driver sup-
ply capacitors are charged through a single high valued
resistor connected to the input supply. When the INTVCC
voltage reaches the turn-on threshold of 12V (automati-
cally raised from 6.7V to provide extra headroom for
start-up), the drivers turn on and begin charging up the
output capacitor. When the output reaches 6.7V, 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 6V 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 6.2V 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 (>6.7V)
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
10V
6.2V to
14V
3810 F04
NDRV
EXTVCC
INTVCC
NDRV
EXTVCC
INTVCC
NDRV
EXTVCC
INTVCC
VIN
I > 270μA
10V
+
VIN
10V
+
LTC3810
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相关代理商/技术参数 |
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| LTC3810IUH-5#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN 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) |
| LTC3810IUH-5#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN 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) |
| LTC3811EG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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) |
| LTC3811EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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) |
| LTC3811EUHF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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) |
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