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参数资料
| 型号： | LTC3810EG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/38页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-SSOP |
| 标准包装： | 47 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 93% |
| 电源电压： | 6.2 V ~ 100 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： | 28-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1336 (CN2011-ZH PDF) |
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LTC3810
OPERATION
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 V IN 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 ef?ciency. 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 (C INTVCC , C DRVCC ).
2. Similar to (1) except that the external MOSFET is used
for continuous IC/driver power instead of just for
Mode 1: MOSFET for Start-Up Only
V IN
I > 270μA
NDRV
start-up. The MOSFET is sized for proper dissipation and
the driver shutdown/restart for V OUT < 6.7V is disabled.
This scheme is less ef?cient but may be necessary if
V OUT < 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 INTV CC
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 suf?cient capacitance
such that they are not discharged below the 6V INTV CC
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.
Mode 2: MOSFET for Continuous Use
V IN
I < 270μA
NDRV
INTV CC
+
10V
INTV CC
+
10V
LTC3810
LTC3810
EXTV CC
Mode 3: Trickle Charge Mode
NDRV
V OUT (>6.7V)
V IN
EXTV CC
Mode 4: External Supply
NDRV
LTC3810
INTV CC
+
10V
INTV CC
LTC3810
+
+
–
6.2V to
14V
EXTV CC
V OUT
EXTV CC
3810 F04
Figure 4. Operating Modes for IC/Driver Supply
3810fc
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3810EUH-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: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 |
| LTC3810EUH-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) |
| LTC3810HUH-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: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 |
| LTC3810HUH-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: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 |
| LTC3810IG | 制造商:Linear Technology 功能描述: |
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