- 您现在的位置：买卖IC网 > PDF目录13814 > LTC3613IWKH#PBF (Linear Technology)IC REG BUCK SYNC ADJ 15A 56QFN PDF资料下载
参数资料
| 型号： | LTC3613IWKH#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/36页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 15A 56QFN |
| 标准包装： | 40 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 4.5 V ~ 24 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 1MHz |
| 电流 - 输出： | 15A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 56-VFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 56-QFN 多焊盘（7x9） |
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页当前第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页第29页第30页第31页第32页第33页第34页第35页第36页
LTC3613
OPERATION
When the RUN pin is pulled low to disable the controller or
when INTV CC drops below its undervoltage lockout thresh-
old of 3.65V, the TRACK/SS pin is pulled low internally.
Light Load Current Operation
When the DC load current is less than 1/2 of the peak-
to-peak inductor current ripple, the inductor current can
drop to zero or become negative. If the MODE/PLLIN pin
is connected to SGND, the LTC3613 will transition into
discontinuous mode operation (also called pulse-skipping
mode), where a current reversal comparator, I REV , detects
and prevents negative inductor current by shutting off the
bottom MOSFET, MB. In this mode, both switches remain
off with the output capacitor supplying the load current.
As the output capacitor discharges and the output volt-
age droops lower, the EA will eventually move the ITH
voltage above the zero current level to initiate another
switching cycle.
If the MODE/PLLIN pin is tied to INTV CC or an external
clock is applied to MODE/PLLIN, the LTC3613 will be forced
to operate in continuous mode (forced continuous mode)
and not transition into discontinuous mode. In this case
the current reversal comparator, I REV , is disabled, allowing
the inductor current to become negative and thus maintain
constant frequency operation.
Frequency Selection and External Clock
Synchronization
The steady-state switching frequency of the LTC3613 is
set by an internal oscillator. The frequency of this internal
oscillator can be programmed from 200kHz to 1MHz by
connecting a resistor from the RT pin to SGND. The RT
pin is forced to 1.2V internally. A phase-locked loop (PLL)
system synchronizes the turn-on of the switching cycle to
this internal oscillator when no external clock is provided.
For applications with stringent frequency or interfer-
ence requirements, an external clock source connected
switching cycle turn-on to the rising edge of the clock.
The LTC3613 operates in forced continuous mode when
it is synchronized to the external clock. The external clock
frequency has to be within ±30% of the internal oscillator
frequency for successful synchronization and the clock
input levels should be greater than 2V for HI and less
than 0.5V for LO. The MODE/PLLIN pin has an internal
600kΩ pull-down resistor.
Power Good and Fault Protection
The power good pin, PGOOD, is connected internally to an
open-drain N-channel MOSFET. An external pull-up resistor
to a voltage supply of up to 6V (or INTV CC ) completes the
power good detection scheme. Overvoltage and undervolt-
age comparators OV and UV turn on the MOSFET and pull
the PGOOD pin low when the differential feedback voltage
is outside a ±7.5% window of the 0.6V reference voltage.
The PGOOD pin is also pulled low when the LTC3613 is
in the soft-start or tracking phase, when in undervoltage
lockout, or when the RUN pin is low (shut down).
When the differential feedback voltage is within the ±7.5%
requirement, the open-drain NMOS is turned off and the
pin is pulled up by an external resistor. There is an internal
delay of 10μs before the PGOOD pin will indicate power
good once the differential feedback voltage is within the
±7.5% window. When the feedback voltage goes out of
the ±7.5% window, there is an internal 20μs delay before
PGOOD is pulled low. In an overvoltage condition, MT is
turned off and MB is turned on immediately without any
delay and held on until the overvoltage condition clears.
Foldback current limiting is provided if the output is shorted
to ground. As the differential feedback voltage drops, the
current threshold voltage on the ITH pin is pulled down
and clamped to 1.2V. This reduces the inductor valley
current level to one-fourth of its maximum value as the
differential feedback approaches 0V. Foldback current
limiting is disabled at start-up.
to the MODE/PLLIN pin can be used to synchronize the
3613fa
12
相关PDF资料 |
PDF描述 |
|---|---|
| 35PX220MEFCT78X11.5 | CAP ALUM 220UF 35V 20% RADIAL |
| 35PX220MEFCTA8X11.5 | CAP ALUM 220UF 35V 20% RADIAL |
| UVR1C471MPD1TD | CAP ALUM 470UF 16V 20% RADIAL |
| 10ML470MEFCT78X9 | CAP ALUM 470UF 10V 20% RADIAL |
| 10ML470MEFCTA8X9 | CAP ALUM 470UF 10V 20% RADIAL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3614EUDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3614EUDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3614IUDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC3614IUDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC3614MPUDD#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN |
发布紧急采购，3分钟左右您将得到回复。