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参数资料
| 型号： | LTC3734EUH#TR |
| 厂商： | Linear Technology |
| 文件页数： | 20/28页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR DC/DC 1PH HI EFF 32QFN |
| 标准包装： | 2,500 |
| 应用： | 控制器，Intel 移动式 CPU |
| 输入电压： | 4 V ~ 30 V |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 1.71 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 带卷 (TR) |
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LTC3734
APPLICATIONS INFORMATION
R AVP ?
(12)
–1
where
AVP is the slope, in mV/A
R SENSE is the current sense resistor
m is the number of phases, m = 1 for LTC3734
R3 and R AVP are defined in Figure 6
g m is the transconductance gain for the error amplifier,
it is about 4.5mmho for LTC3734.
Rewriting this equation, we can estimate the R AVP value
to be:
35.5 ? R3
m ? | AVP|
R SENSE
Typically the calculation results based on these equations
have ±10% tolerance. So the resistor values need to be
fine tuned.
V OUT+
R3
R2
R1
V OA+
V OA–
R AVP
+
–
OAOUT
Efficiency Considerations
The percent efficiency of a switching regulator is equal to
the output power divided by the input power times 100%.
It is often useful to analyze individual losses to determine
what is limiting the efficiency and which change would
produce the most improvement. Percent efficiency can
be expressed as:
%Efficiency = 100% – (L1 + L2 + L3 + ...)
–
FB
VID
0.6V +
Figure 6. Simplified Schematic
Diagram for AVP Design in LTC3734
I TH
3735 F09
where L1, L2, etc. are the individual losses as a percent-
age of input power.
Although all dissipative elements in the circuit produce
losses, four main sources usually account for most of
the losses in LTC3734 circuits: 1) I 2 R losses, 2) Topside
MOSFET transition losses, 3) PV CC supply current and
4) C IN loss.
R AVP ?
35.5 ? R3 ? R SENSE
m ? | AVP|
R SENSE R3 R
if g m ? R3 >>
Rewritingequation(9)wecanestimatetheAVPresistor
to be:
(10)
We also adopt the current sense resistors as part of
voltage positioning slopes. So the total load line slope is
estimated to be:
AVP ? –35.5 ? ? – SENSE , (11)
m R AVP m
V OUT
0.6V
1) I 2 R losses are predicted from the DC resistances of
the fuse (if used), MOSFET, inductor, and current sense
resistor. In continuous mode the average output current
flows through L and R SENSE , but is “chopped” between the
topside MOSFET and the synchronous MOSFET. If the two
MOSFETs have approximately the same R DS(ON) , then the
resistance of one MOSFET can simply be summed with
the resistances of L, R SENSE and ESR to obtain I 2 R losses.
For example, if each R DS(ON) = 10mΩ, R L = 10mΩ, and
R SENSE = 5mΩ, then the total resistance is 25mΩ. This
results in losses ranging from 2% to 8% as the output
current increases from 3A to 15A per output stage for a 5V
output, or a 3% to 12% loss per output stage for a 3.3V
3734fa
20
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| LTC3735EG#TR | 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 |
| LTC3735EG#TRPBF | 功能描述:IC CTRLR DC/DC 2PH HI EFF 36SSOP 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 |
| LTC3735EUHF | 功能描述:IC CTRLR DC/DC 2PH HI EFF 38-QFN 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 |
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