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参数资料
| 型号： | LTC3878IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2MHz |
| 占空比： | 90% |
| 电源电压： | 4 V ~ 38 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 ~ 85°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LTC3878
PIN FUNCTIONS
RUN/SS (Pin 1): Run Control and Soft-Start Input. A
capacitor to ground on this pin sets the ramp time to full
output current (approximately 3s/μF) when RUN/SS is
open. The switching outputs are disabled when below 1.5V.
The device is in micropower shutdown when under 0.7V.
If left open, there is an internal 1.2μA pull-up current on
RUN/SS. INTV CC is enabled when RUN/SS exceeds 0.7V.
PGOOD (Pin 2): Power Good Output. This open-drain
logic output is pulled to ground when the output voltage is
outside of a ±7.5% window around the regulation point.
V RNG (Pin 3): V DS Sense Voltage Range Input. The maxi-
mum allowed bottom MOSFET V DS sense voltage between
SW and PGND is equal to (0.133)V RNG . The voltage applied
to V RNG can be any value between 0.2V and 2V. If V RNG is
tied to SGND, the device operates with a maximum valley
current sense threshold of 93mV typical. If V RNG is tied
to INTV CC , the device operates with a maximum valley
current sense threshold of 186mV typical.
FCB (Pin 4): Forced Continuous Input. Connect this pin
to INTV CC to enable discontinuous mode for light load
operation. Connect this pin to SGND to force continuous
mode operation in all conditions.
I TH (Pin 5): Current Control Threshold and Error Amplifier
Compensation Point. The current comparator threshold
increases with this control voltage. The voltage ranges
from 0V to 2.4V, with 0.8V corresponding to zero sense
voltage (zero current).
SGND (Pin 6): Signal Ground. All small-signal components
should be connected to SGND. Connect SGND to PGND
using a single PCB trace.
V FB (Pin 8): Error Amplifier Feedback Input. This pin con-
nects the error amplifier to an external resistive divider
from V OUT .
NC (Pin 9): For factory use only. Can be connected to any
voltage equal to or less than INTV CC .
V IN (Pin 10): Main Input Supply. The supply voltage can
range from 4V to 38V. For increased noise immunity de-
couple this pin to PGND with an RC filter.
INTV CC (Pin 11): Internal 5.3V Regulator Output. The
driver and control circuits are powered from this voltage.
Decouple this pin to PGND with a minimum of 1μF, 10V
X5R or X7R ceramic capacitor.
BG (Pin 12): Bottom Gate Drive. This pin drives the gate
of the bottom N-Channel power MOSFET between PGND
and INTV CC .
PGND (Pin 13): Power Ground. Connect this pin as close
as practical to the source of the bottom N-channel power
MOSFET, the (–) terminal of C INTVCC and the (–) terminal
of C VIN .
SW (Pin 14): Switch Node. The (–) terminal of the bootstrap
capacitor, C B , connects to this node. This pin swings from
a diode voltage below ground up to V IN .
TG (Pin 15): Top Gate Drive. This pin drives the gate of the
top N-channel power MOSFET between SW and BOOST.
BOOST (Pin 16): Boosted Floating Driver Supply. The (+)
terminal of the bootstrap capacitor, C B , connects to this
node. This node swings from (INTV CC – V SCHOTTKY ) to
V IN + (INT VCC – V SCHOTTKY ).
I ON (Pin 7): On-Time Current Input. Tie a resistor from
V IN to this pin to set the one-shot timer current and thus
the switching frequency.
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相关代理商/技术参数 |
参数描述 |
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| LTC3879EMSE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-MSOP 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) |
| LTC3879EMSE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-MSOP 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) |
| LTC3879EUD#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-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) |
| LTC3879EUD#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-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) |
| LTC3879IMSE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-MSOP 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) |
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