- 您现在的位置：买卖IC网 > PDF目录1832 > LTC3789EGN#PBF (Linear Technology)IC REG CTRLR BST PWM CM 28-SSOP PDF资料下载
参数资料
| 型号： | LTC3789EGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 28-SSOP |
| 标准包装： | 49 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 710kHz |
| 占空比： | 98% |
| 电源电压： | 4 V ~ 38 V |
| 降压： | 是 |
| 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： | 28-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
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页第13页当前第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
LTC3789
OPERATION
D MIN _ BOOST = ?
? ? 100% = 8.33%
ThedutycycleofswitchCdecreasesuntiltheminimum
duty cycle of the converter reaches D MIN_BOOST , given by:
? 1 ?
? 12 ?
Figure 5 shows typical boost region waveforms. If V IN
approaches V OUT , the buck-boost region is reached.
CLOCK
SWITCH A
SWITCH B
SWITCH C
SWITCH D
I L
3789 F04a
(4a) Buck-Boost Region (V IN ≥ V OUT )
CLOCK
SWITCH A
SWITCH B
SWITCH C
Light Load Current Operation
The LTC3789 can be enabled to enter pulse-skipping mode
or forced continuous conduction mode. To select forced
continuous operation, tie the MODE/PLLIN pin to a DC
voltage below 0.8V (e.g., SGND). To select pulse-skipping
mode of operation, tie the MODE/PLLIN pin to INTV CC .
When the LTC3789 enters pulse-skipping mode, in the
boost region, synchronous switch D is held off whenever
reverse current through switch A is detected. At very
light loads, the current comparator, I CMP , may remain
tripped for several cycles and force switch C to stay off
for the same number of cycles (i.e., skipping pulses). In
the buck region, the inductor current is not allowed to re-
verse. Synchronous switch B is held off whenever reverse
current on the inductor is detected. At very light loads,
the current comparator, I CMP , may remain untripped for
several cycles, holding switch A off for the same number
of cycles. Synchronous switch B also remains off for the
skipped cycles. In the buck-boost region, the controller
operates alternatively in boost and buck region in one
clock cycle, as in continuous operation. A small amount
of reverse current is allowed, to minimize ripple. For the
same reason, a narrow band of continuous buck and boost
operation is allowed on the high and low line ends of the
buck-boost region.
SWITCH D
I L
CLOCK
SWITCH A
SWITCH B
SWITCH C
SWITCH D
I L
(4b) Buck-Boost Region (V IN ≤ V OUT )
Figure 4. Buck-Boost Region
Figure 5. Boost Region (V IN << V OUT )
3789 F04b
HIGH
0V
3789 F05
Output Overvoltage
If the output voltage is higher than the value commanded
by the V FB resistor divider, the LTC3789 will respond ac-
cording to the mode and region of operation. In continuous
conduction mode, the LTC3789 will sink current into the
input. If the input supply is capable of sinking current, the
LTC3789 will allow up to about 160mV/R SENSE to be sunk
into the input. In pulse-skipping mode and in the buck or
boost regions, switching will stop and the output will be
allowed to remain high. In pulse-skipping mode, and in the
buck/boost region as well as the narrow band of continu-
ous boost operation that adjoins it, current sunk into the
input through switch?A is limited to approximately 40mV/
R DS(ON) of switch A. If this level is reached, switching will
stop and the output will rise. In pulse-skipping mode, and
in the narrow continuous buck region that adjoins the buck/
boost region, current sunk into the input through R SENSE
is limited to approximately 40mV/R SENSE .
3789fa
14
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3801BES6#TRM | IC REG CTRLR BUCK PWM TSOT23-6 |
| LTC3802EGN | IC REG CTRLR BUCK PWM VM 28-SSOP |
| LTC3803MPS6-3#TRMPBF | IC REG CTRLR FLYBK PWM TSOT23-6 |
| LTC3803MPS6-5#TRMPBF | IC REG CTRLR FLYBK PWM TSOT23-6 |
| LTC3803MPS6#TRMPBF | IC REG CTRLR FLYBK PWM TSOT23-6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3789EUFD#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-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 |
| LTC3789EUFD#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 28-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 |
| LTC3789IGN#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 |
| LTC3789IGN#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: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 |
| LTC3789IUFD#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-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 |
发布紧急采购，3分钟左右您将得到回复。