参数资料
| 型号： | MIC5314-GGYMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.8V .3A 12-TMLF |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.8V |
| 输入电压： | 1.7 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.085V @ 300mA |
| 稳压器数量： | 2 |
| 电流 - 输出： | 300mA |
| 电流 - 限制（最小）： | 350mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-UFDFN 裸露焊盘，12-TMLF? |
| 供应商设备封装： | 12-TMLF?（2.5x2.5） |
| 包装： | 标准包装 |
| 产品目录页面： | 1102 (CN2011-ZH PDF) |
| 其它名称： | 576-3140-6 |
Micrel, Inc.
Application Information
The MIC5314 is a high performance, dual low input
voltage, ultra-low dropout regulator designed for
applications requiring very fast transient response. The
MIC5314 utilizes two input supplies (V IN and V BIAS ),
significantly reducing the dropout voltage.
The MIC5314 regulator is fully protected from damage
due to fault conditions, offering linear current limiting and
thermal shutdown.
Bias Supply Voltage
V BIAS , requiring relatively light current, provides power to
the control portion of the MIC5314. Bypassing on the
MIC5314
50% and 60%, respectively, over their operating
temperature ranges. To use a ceramic chip capacitor
with Y5V dielectric, the value must be much higher than
an X7R ceramic capacitor to ensure the same minimum
capacitance over the equivalent operating temperature
range.
Bypass Capacitor
A capacitor can be placed from the bypass pin-to-ground
to reduce the output voltage noise. The capacitor
bypasses the internal reference. A 0.01μF capacitor is
recommended for applications that require low-noise
outputs. The bypass capacitor can be increased, further
reducing noise and improving PSRR. Turn-on time
bias pin is recommended to improve performance of the
increases slightly with
respect to the bypass
regulator during line and load transients. A 1μF ceramic
capacitor from V BIAS -to-ground is recommended to help
reduce the high frequency noise from being injected into
the control circuitry.
Input Supply Voltage
V IN1 and V IN2 , provide the supply to power the LDOs
independently. The minimum input voltage is 1.7V
allowing conversion from low voltage supplies. The low
input voltage provides high efficiency by reducing the
input to output voltage step which minimizes the
regulator power loss.
Input Capacitor
The MIC5314 is a high-performance, high bandwidth
device. Therefore, it requires a well-bypassed input
supply for optimal performance. A 1μF capacitor is
required from the input-to-ground to provide stability.
Low-ESR ceramic capacitors provide optimal
performance at a minimum of space. Additional high-
frequency capacitors, such as small-valued NPO
dielectric-type capacitors, help filter out high-frequency
noise and are good practice in any RF-based circuit.
X5R or X7R dielectrics are recommended for the input
capacitor. Y5V dielectrics lose most of their capacitance
over temperature and are therefore, not recommended.
Output Capacitor
The MIC5314 requires an output capacitor of 1μF or
greater to maintain stability. The design is optimized for
use with low-ESR ceramic chip capacitors. High ESR
capacitors may cause high frequency oscillation. The
output capacitor can be increased, but performance has
been optimized for a 1μF ceramic output capacitor and
does not improve significantly with larger capacitance.
X7R/X5R dielectric-type ceramic capacitors are
recommended because of their temperature
performance. X7R-type capacitors change capacitance
by 15% over their operating temperature range and are
the most stable type of ceramic capacitors. Z5U and
Y5V dielectric capacitors change value by as much as
capacitance. A unique, quick-start circuit allows the
MIC5314 to drive a large capacitor on the bypass pin
without significantly slowing turn-on time.
No-Load Stability
Unlike many other voltage regulators, the MIC5314 will
remain stable and in regulation with no load. This is
especially important in CMOS RAM keep-alive
applications.
Enable/Shutdown
The MIC5314 is provided with dual active-high enable
pins that allow each regulator to be disabled
independently. Forcing the enable pin low disables the
regulator and sends it into a “zero” off-mode-current
state. In this state, current consumed by the regulator
goes nearly to zero. Forcing the enable pin high enables
the output voltage. The active-high enable pin uses
CMOS technology and the enable pin cannot be left
floating; a floating enable pin may cause an
indeterminate state on the output.
Power On Reset
The second regulator (LDO2) provides a Power On
Reset (POR2) status pin. This pin is an open drain
output. When LDO2 is enabled an active low POR2
indicates an under voltage condition on V OUT2 .
The POR2 status signal can be programmed for a delay
(1sec/μF) by adding a capacitor from the C SET2 pin to
ground. Zero delay is added by leaving the C SET2 pin
open circuit.
Thermal Considerations
The MIC5314 is designed to provide 300mA of
continuous current for both outputs in a very small
package. Maximum ambient operating temperature can
be calculated based upon the output current and the
voltage drop across the part. Given that the input voltage
is 1.8V, the output voltage is 1.5V for V OUT1 , 1.0V for
V OUT2 and the output current = 300mA for each output.
The actual power dissipation of the regulator circuit can
July 2008
10
M9999-070208-A
相关PDF资料 |
PDF描述 |
|---|---|
| MIC5314-FCYMT TR | IC REG LDO 1.5V/1V .3A 12-TMLF |
| MIC5314-F6YMT TR | IC REG LDO 1.5V/1.4V .3A 12-TMLF |
| MIC5314-F5YMT TR | IC REG LDO 1.5V/1.3V .3A 12-TMLF |
| ABB10DHBD | CONN EDGECARD 20POS R/A .050 SLD |
| RMC20DRAS-S734 | CONN EDGECARD 40POS .100 R/A PCB |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5315-F4CYMT | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC5315-F4CYMT TR | 功能描述:低压差稳压器 - LDO Low Vin/Vout Dual 300mA LDO with VSC in 2mm x 2mm TMLF 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 |
| MIC5315-F4CYMT-TR | 功能描述:Linear Voltage Regulator IC Positive Fixed 2 Output 1.5V, 1.2/1V 300mA 10-TMLF? (2x2) 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 稳压器拓扑:正，固定式 电压 - 输出:1.5V，1.2/1V 电流 - 输出:300mA 电压 - 跌落（典型值）:0.085V @ 300mA 稳压器数:2 电压 - 输入:1.7 V ~ 5.5 V 电流 - 限制（最小值）:350mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-UFDFN，10-TMLF? 供应商器件封装:10-TMLF?（2x2） 标准包装:1 |
| MIC5315-F5CYMT | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC5315-F5CYMT TR | 功能描述:低压差稳压器 - LDO Low Vin/Vout Dual 300mA LDO with VSC in 2mm x 2mm TMLF 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 |
发布紧急采购，3分钟左右您将得到回复。