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参数资料
| 型号： | LTC3829EUHF#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PQCC38 |
| 封装： | 5 X 7 MM, LEAD FREE, PLASTIC, M0-220WHKD, QFN-38 |
| 文件页数： | 19/40页 |
| 文件大小： | 478K |
| 代理商： | LTC3829EUHF#PBF |
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LTC3829
3829f
applicaTions inForMaTion
The final load slope is defined by the inductor current
sense resistors and the two external resistors mentioned
above.
In summary, the load slope is:
R
V A
SENSE
AVP
/
PRE-AVP
The recommended value for RAVP is 90Ω to 100Ω. The
maximum output voltage at AVP is 2.5V. Therefore, for
output higher than 2.5V, AVP function is not supported.
TheDIFFPpin,however,shouldalwaysbeconnectedtothe
output even when AVP or diffamp functions are not used.
Programmable Shed Mode
When the MODE pin is tied to INTVCC, the LTC3829 enters
shed mode. It means that the second and third channel will
stop switching when ITH is below a certain programmed
threshold. The threshold voltage on ITH when LTC3829
goes into shed mode, is programmed according to the
following formula:
VSHED = 0.5 + (5/3) (0.5 – VISET)
The valid range of VISET is between 0V to 0.5V and VISET
is the voltage on the ISET pin. There is a precision 7.5A
flowing out of the ISET pin. Connecting a resistor to SGND
sets the VISET voltage. When left floating, VISET voltage
will be at INTVCC. The shed mode threshold voltage in this
case will be 0.5V. There is a 50mV hysteresis for the shed
mode threshold comparator.
Programmable Burst Mode Operation
When the MODE pin is floating, the LTC3829 enters Burst
Mode operation. This means that all channels will stop
switching when ITH is below a certain threshold.
The Burst Mode clamp, which sets the current limit when
bursting, can be programmed through VISET according to
the following equation:
VCLAMP = 0.7 + 0.62 (0.5 – VISET)
The valid range of VISET is between 0.3V to 0.5V and VISET
is the voltage on the ISET pin. There is a precision 7.5A
flowing out of ISET. Connecting a resistor to SGND sets
the VISET voltage. When left floating, the VISET voltage
will be at INTVCC. The Burst Mode clamp voltage in this
case will be 0.7V. There is a 50mV hysteresis for the Burst
Mode comparator.
Nonlinear Control Loop
The LTC3829 features a unique control loop that can speed
up transient response dramatically. This feature is enabled
and programmed through the IFAST pin. When IFAST is
tiedtoINTVCC,thenonlinearcontrolloopisdisabled.VIFAST
is the voltage that can be programmed on the IFAST pin.
There is a precision 10A flowing out of the ISET pin. Con-
necting a resistor to SGND sets the VIFAST voltage. When
VIFAST is set below 0.5V, the difference of 0.5V and VIFAST
sets the threshold voltage that triggers nonlinear control.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3829IFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP 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: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 |
| LTC3829IFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP 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: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 |
| LTC3829IUHF#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: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 |
| LTC3829IUHF#TRPBF | 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: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 |
| LTC3830-1ES8 | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
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