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参数资料
| 型号： | MIC5164YMM |
| 厂商： | Micrel Inc |
| 文件页数： | 10/23页 |
| 文件大小： | 0K |
| 描述： | IC REG CTLR DUAL DDR2/3 10MSOP |
| 特色产品： | MIC5164 Dual Regulator |
| 标准包装： | 100 |
| 应用： | 控制器，DDR3，GDDR3/4/5 |
| 输入电压： | 1.35 V ~ 6 V |
| 输出数： | 1 |
| 输出电压： | 可编程 |
| 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） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
| 其它名称： | 576-3721-5 |
Micrel, Inc.
Figure 4. V REF Follows V DDQ
VREF can also be manipulated for different applications.
A separate voltage source can be used to externally set
the reference point, bypassing the divider network. Also,
external resistors can be added from V REF -to-V DDQ or
V REF -to-ground to shift the reference point up or down.
VCC
The VCC voltage range is from 3V to 6V, but the
minimum voltage on the VCC pin should consider the
Gate-to-Source voltage of the MOSFET and V TT voltage.
For example, on an SSTL compliant terminator, V DDQ
equals 2.5V and V TT equals 1.25V. If the N-Channel
MOSFET selected requires a gate source voltage of
2.5V, V CC should be a minimum of 3.75V.
V CCmin =V TT +V GS
Feedback and Compensation
The feedback (FB) pin is connected to V TT for regulation.
An external resistor must be placed between FB and
V TT . This allows the error amplifier to be correctly
externally compensated. For most applications, a 510 ?
resistor is recommended.
The COMP pin on the MIC5164 is the output of the
internal error amplifier. By placing a capacitor and
resistor between the COMP pin and the FB pin, this
coupled with the feedback resistor, places an external
pole and zero on the error amplifier. With a 510 ? FB
resistor, a minimum 220pF capacitor is recommended
for a 3A peak termination circuit. An increase in the load
will require additional N-Channel MOSFETs and/or
increase in output capacitance may require feedback
and/or compensation capacitor values to be changed to
maintain stability.
MIC5164
Enable
EN can be tied directly to V DDQ or V CC for functionality.
Do not float the EN pin. Floating this pin causes the
enable circuitry to be in an undetermined state.
Power Good
PG signal output remains high as long as output is within
±10% range of regulated V TT and goes low if output
moves beyond this range.
Input Capacitance
The MIC5164 application operates in the linear region
during the steady state condition, so there are no
switching current pulses from the input capacitor. The
application does not require a bulk input capacitor, but
using one greatly improves device performance during
fast load transients. Since output voltage V TT follows the
input voltage V DDQ attention should be given to possible
voltage dips on VDDQ pin. Capacitors with low ESR
such as OS-CON and ceramics are recommended for
bypassing the input. Although a 100 μ F ceramic
capacitor will suffice for most applications, input
capacitance may need to be increased in cases where
the termination circuit is greater than 1-inch away from
the bulk capacitance.
Output Capacitance
Large, low-ESR capacitors are recommended for the
output (V TT ) of the MIC5164. Although low-ESR
capacitors are not required for stability, they are
recommended to reduce the effects of high-speed
current transients on V TT . The change in voltage during
the transient condition will be the effect of the peak
current multiplied by the output capacitor’s ESR. For that
reason, OS-CON type capacitors are excellent for this
application. They have extremely low ESR and large
capacitance-to-size ratio. Ceramic capacitors are also
well suited to termination due to their low ESR. These
capacitors should have a dielectric rating of X5R or X7R.
Y5V and Z5U type capacitors are not recommended,
due to their poor performance at high frequencies and
over temperature. The minimum recommended
capacitance for a 3A peak circuit is 100 μ F. Output
capacitance can be increased to achieve greater
transient performance.
MOSFET Selection
The MIC5164 utilizes external N-Channel MOSFETs to
sink and source current. MOSFET selection will be
determined by two main characteristics: size and gate
threshold (V GS ).
MOSFET Power Requirements
One of the most important factors to determine is the
amount of power the MOSFET required to dissipate.
June 2010
10
M9999-061510
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5164YMM TR | 功能描述:低压差稳压器 - LDO Single Output, PWM Sync Buck Control RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC5165 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Dual Regulator Controller for DDR3 GDDR3/4/5 Memory Termination |
| MIC5165YMM | 功能描述:低压差稳压器 - LDO Dual Regulator Controller for DDR2/3 w/ Power Good RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC5165YMM TR | 功能描述:低压差稳压器 - LDO Dual Regulator Controller for DDR2/3 w/ Power Good RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC5166 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3A High-Speed Low VIN DDR Terminator |
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