- 您现在的位置：买卖IC网 > PDF目录44993 > LTC3789EUFD#TRPBF (LINEAR TECHNOLOGY CORP) 0.1 A SWITCHING CONTROLLER, 710 kHz SWITCHING FREQ-MAX, PQCC28 PDF资料下载
参数资料
| 型号： | LTC3789EUFD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.1 A SWITCHING CONTROLLER, 710 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封装： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件页数： | 5/28页 |
| 文件大小： | 486K |
| 代理商： | LTC3789EUFD#TRPBF |
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
LTC3789
13
3789f
operaTion
The duty cycle of switch C decreases until the minimum
duty cycle of the converter reaches DMIN_BOOST, given by:
DMIN_BOOST =
1
12
100% = 8.33%
Figure 5 shows typical boost region waveforms. If VIN
approaches VOUT, the buck-boost region is reached.
(4a) Buck-Boost Region (VIN ≥ VOUT)
(4b) Buck-Boost Region (VIN ≤ VOUT)
Figure 4. Buck-Boost Region
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 INTVCC.
When the LTC3789 enters pulse-skipping mode, in the
boost region, synchronous switch D is held off whenever
reverse current on the inductor is detected. At very light
loads, the current comparator, ICMP , 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 reverse.
Synchronous switch B is held off whenever reverse
current on the inductor is detected. At very light loads,
the current comparator, ICMP , 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.
Output Overvoltage
If the output voltage is higher than the value commanded
by the VFB resistor divider, the LTC3789 will respond ac-
cordingtothemodeandregionofoperation.Incontinuous
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/RSENSE 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 switchA is limited to approximately 40mV/
RDS(ON) of switch A. If this level is reached, switching will
stop and the output will rise. In pulse-skipping mode, and
inthenarrowcontinuousbuckregionthatadjoinsthebuck/
boost region, current sunk into the input through RSENSE
is limited to approximately 40mV/RSENSE.
Figure 5. Boost Region (VIN << VOUT)
SWITCH A
CLOCK
SWITCH B
SWITCH C
SWITCH D
IL
3789 F04a
SWITCH A
CLOCK
SWITCH B
SWITCH C
SWITCH D
IL
3789 F04b
SWITCH A
CLOCK
SWITCH B
SWITCH C
SWITCH D
IL
0V
HIGH
3789 F05
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3789EGN#PBF | 0.1 A SWITCHING CONTROLLER, 710 kHz SWITCHING FREQ-MAX, PDSO28 |
| LTC3789IUFD#PBF | 0.1 A SWITCHING CONTROLLER, 710 kHz SWITCHING FREQ-MAX, PQCC28 |
| LTC3789IGN#TRPBF | 0.1 A SWITCHING CONTROLLER, 710 kHz SWITCHING FREQ-MAX, PDSO28 |
| LTC3803HS6-3#TRPBF | 1 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3803MPS6-3#TR | 1 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LTC3789IUFD#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 |
| LTC3789IUFDPBF | 制造商:Linear Technology 功能描述:4-Switch Buck-Boost Controller QFN28EP |
发布紧急采购，3分钟左右您将得到回复。