- 您现在的位置：买卖IC网 > PDF目录5232 > LTC3733CUHF-1#TRPBF (Linear Technology)IC CTRLR BUCK 3PH AMD CPU 38-QFN PDF资料下载
参数资料
| 型号： | LTC3733CUHF-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR BUCK 3PH AMD CPU 38-QFN |
| 标准包装： | 2,500 |
| 应用： | 控制器，AMD |
| 输入电压： | 4 V ~ 36 V |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 1.55 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 供应商设备封装： | 38-QFN（5x7） |
| 包装： | 带卷 (TR) |
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页第14页第15页第16页第17页当前第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
LTC3733/LTC3733-1
APPLICATIO S I FOR ATIO
R SENSE = N
series of surface-mount tantalums or the Panasonic SP
series of surface mount special polymer capacitors avail-
able in case heights ranging from 2mm to 4mm. Other
capacitor types include Sanyo POS-CAP, Sanyo OS-CON,
Nichicon PL series and Sprague 595D series. Consult the
manufacturer for other specific recommendations.
R SENSE Selection for Output Current
Once the frequency and inductor have been chosen,
R SENSE1, R SENSE2, R SENSE3 are determined based on the
required peak inductor current. The current comparator
has a maximum threshold of 75mV/R SENSE and an input
common mode range of SGND to (1.1) ? V CC . The current
comparator threshold sets the peak inductor current,
yielding a maximum average output current I MAX equal to
the peak value less half the peak-to-peak ripple current,
? I L .
Allowing a margin for variations in the IC and external
component values yields:
50mV
I MAX
The IC works well with values of R SENSE from 0.001 ? to
0.02 ? .
V CC Decoupling
The V CC pin supples power not only the internal circuits of
the controller but also the top and bottom gate drivers and
therefore must be bypassed very carefully to ground with
a ceramic capacitor, type X7R or X5R (depending upon
the operating temperature environment) of at least 1 μ F
immediately next to the IC and preferably an additional
10 μ F placed very close to the IC due to the extremely high
instantaneous currents involved. The total capacitance,
taking into account the voltage coefficient of ceramic
capacitors, should be 100 times as large as the total
combined gate charge capacitance of ALL of the MOSFETs
to supply the high transient currents required by the
MOSFET gate drivers while keeping the 5V supply quiet
enough so as not to disturb the very small-signal high
bandwidth of the current comparators.
Topside MOSFET Driver Supply (C B , D B )
External bootstrap capacitors, C B , connected to the BOOST
pins, supply the gate drive voltages for the topside
MOSFETs. Capacitor C B in the Functional Diagram is
charged though diode D B from V CC when the SW pin is
low. When one of the topside MOSFETs turns on, the
driver places the C B voltage across the gate-source of the
desired MOSFET. This enhances the MOSFET and turns on
the topside switch. The switch node voltage, SW, rises to
V IN and the BOOST pin follows. With the topside MOSFET
on, the boost voltage is above the input supply (V BOOST =
V CC + V IN ). The value of the boost capacitor C B needs to be
30 to 100 times that of the total input capacitance of the
topside MOSFET(s). The reverse breakdown of D B must be
greater than V IN(MAX).
Differential Amplifier
The IC has a true remote voltage sense capability. The
sensing connections should be returned from the load,
back to the differential amplifier’s inputs through a com-
mon, tightly coupled pair of PC traces. The differential
amplifier rejects common mode signals capacitively or
inductively radiated into the feedback PC traces as well as
ground loop disturbances. The differential amplifier out-
put signal is divided down through the VID DAC and is
compared with the internal, precision 0.6V voltage refer-
ence by the error amplifier.
The amplifier has a 0 to V CC common mode input range
and an output swing range of 0 to V CC – 1.2V. The output
uses an NPN emitter follower with 80k ? feedback resis-
tance. A DC resistive load to ground is required in order to
sink more current.
being driven. Good bypassing close to the IC is necessary
3733f
18
相关PDF资料 |
PDF描述 |
|---|---|
| HSM22DSAN | CONN EDGECARD 44POS R/A .156 SLD |
| HMM22DSAN | CONN EDGECARD 44POS R/A .156 SLD |
| LTC3733CUHF-1#TR | IC CTRLR BUCK 3PH AMD CPU 38-QFN |
| LTC3733CUHF-1#PBF | IC CTRLR BUCK 3PH AMD CPU 38-QFN |
| HSM22DSAH | CONN EDGECARD 44POS R/A .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3734EUH | 功能描述:IC CTRLR DC/DC 1PH HI EFF 32QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3734EUH#PBF | 功能描述:IC CTRLR DC/DC 1PH HI EFF 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| LTC3734EUH#TR | 功能描述:IC CTRLR DC/DC 1PH HI EFF 32QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3734EUH#TRPBF | 功能描述:IC CTRLR DC/DC 1PH HI EFF 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3735EG | 功能描述:IC CTRLR DC/DC 2PH HI EFF 36SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
发布紧急采购，3分钟左右您将得到回复。