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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： | 16/36页 |
| 文件大小： | 495K |
| 代理商： | LTC3810IG#TR |
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LTC3810
23
3810fb
Using an External Supply Connected to the INTVCC/
DRVCC Pins
If an external supply is available between 6.2V and 14V,
the supply can be connected directly to the INTVCC/DRVCC
pins. In this mode, INTVCC, EXTVCC and NDRV must be
shorted together.
INTVCC/DRVCC Supply and the EXTVCC Connection
The LTC3810 contains an internal low dropout regulator to
produce the 10V INTVCC/DRVCC supply from the EXTVCC
pin voltage. This regulator turns on when the EXTVCC pin
is above 6.7V and remains on until EXTVCC drops below
6.4V. This allows the IC/MOSFET power to be derived from
the output or an output derived boost network during
normal operation and from the external NMOS from VIN
during start-up or short-circuit. Using the EXTVCC pin in
this way results in signicant efciency gains compared
to what would be possible when deriving this power
continuously from the typically much higher VIN voltage.
The EXTVCC connection also allows the power supply to
be congured in trickle charge mode in which it starts up
with a high valued “bleed” resistor connected from VIN
to INTVCC to charge up the INTVCC capacitor. As soon as
the output rises above 6.7V the internal EXTVCC regulator
takes over before the INTVCC capacitor discharges below
the UV threshold. When the EXTVCC regulator is active,
the EXTVCC pin can supply up to 50mA RMS. Do not ap-
ply more than 15V to the EXTVCC pin. The following list
summarizes the possible connections for EXTVCC:
1. EXTVCC grounded. This connection will require INTVCC
to be powered continuously from an external NMOS
from VIN resulting in an efciency penalty as high as
10% at high input voltages.
2. EXTVCC connected directly to VOUT. This is the normal
connection for 6.7V < VOUT < 15V and provides the
highest efciency. The power supply will start up using
an external NMOS or a bleed resistor until the output
supply is available.
3. EXTVCC connected to an output-derived boost network.
If VOUT < 6.7V. The low voltage output can be boosted
using a charge pump or yback winding to greater
than 6.7V.
4. EXTVCC connected to INTVCC. This is the required
connection for EXTVCC if INTVCC is connected to an
external supply where the external supply is 6.2V <
VEXT < 15V.
Applications using large MOSFETs with a high input volt-
age and high frequency of operation may result in a large
EXTVCC pin current. Therefore, it is good design practice
to verify that the maximum junction temperature rating
and RMS current rating are within the maximum limits.
Typically, most of the EXTVCC current consists of the
MOSFET gates current. In continuous mode operation,
this EXTVCC current is:
IEXTVCC = fQG(TOP) + QG(BOTTOM)
()+3mA<50mA
The junction temperature can be estimated from the
equations given in Note 2 of the Electrical Characteristics
as follows:
TJ = TA + IEXTVCC (VEXTVCC – VINTVCC)(100°C/W)
< 125°C
If absolute maximum ratings are exceeded, consider
using an external supply connected directly to the
INTVCC pin.
APPLICATIONS INFORMATION
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相关代理商/技术参数 |
参数描述 |
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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) |
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