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參數(shù)資料
| 型號(hào)： | MIC5350-3.3/2.8YMT |
| 廠商： | MICREL INC |
| 元件分類(lèi)： | 固定正電壓多路輸出LDO穩(wěn)壓器 |
| 英文描述： | FIXED POSITIVE LDO REGULATOR, PDSO8 |
| 封裝： | 2 X 2 MM, GREEN, TMLF-8 |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 439K |
| 代理商： | MIC5350-3.3/2.8YMT |
Micrel, Inc.
MIC5350
June 2010
8
M9999-060410
Applications Information
Enable/Shutdown
The MIC5350 comes with dual active-high enable pins
that allow each regulator to be enabled independently.
Forcing both enable pins low disables the regulators 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.
Input Capacitor
The MIC5350 is a high-performance, high-bandwidth
device. Therefore, it requires a well-bypassed input
supply for optimal performance. A 2.2F 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.
Output Capacitor
The MIC5350 requires an output capacitor of 2.2F 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 2.2F ceramic output capacitor and
does not improve significantly with larger capacitance.
X7R/X5R
dielectric-type
ceramic
capacitors
are
recommended because of their superior 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
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 noise bypass pin-to-
ground to reduce output voltage noise. The capacitor
bypasses the internal reference. A 0.1F 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
increases slightly with respect to bypass capacitance.
A unique, quick-start circuit allows the MIC5350 to drive
a large capacitor on the bypass pin without significantly
slowing turn-on time.
No-Load Stability
Unlike many other voltage regulators, the MIC5350 will
remain stable with no load. This is especially important
in CMOS RAM keep-alive applications.
Thermal Considerations
The MIC5350 is designed to provide 300mA of
continuous current for VOUT1 and 500mA for VOUT2 in a
very small package. Maximum ambient operating
temperature can be calculated based on the output
current and the voltage drop across the part. Given that
the input voltage is 3.3V, the output voltage is 2.8V for
VOUT1, 2.8V for VOUT2 and the output current 300mA and
500mA respectively. The actual power dissipation of the
regulator circuit can be determined using the equation:
PD = (VIN – VOUT1) IOUT1 + (VIN – VOUT2) IOUT2+ VIN
IGND
Because this device is CMOS and the ground current is
typically <100A over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
PD = (3.3V – 2.8V) × 300mA + (3.3V -2.8) ×
500mA
PD = 0.4W
To
determine
the
maximum
ambient
operating
temperature of the package, use the junction-to-ambient
thermal resistance of the device and the following basic
equation:
PD(MAX) =
TJ(MAX) - TA
JA
TJ(max) = 125°C, the maximum junction temperature of
the die θJA thermal resistance = 90°C/W.
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| MIC5350-MGYMT TR | 功能描述:低壓差穩(wěn)壓器 - LDO Dual 500mA/300mA LDO in 2mm x 2mm Thin MLF RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MIC5350-MGYMT-TR | 功能描述:Linear Voltage Regulator IC Positive Fixed 2 Output 2.8V, 1.8V 300mA, 500mA 8-TMLF? (2x2) 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):停產(chǎn) 穩(wěn)壓器拓?fù)?正，固定式 電壓 - 輸出:2.8V，1.8V 電流 - 輸出:300mA，500mA 電壓 - 跌落（典型值）:0.75V @ 300mA，- 穩(wěn)壓器數(shù):2 電壓 - 輸入:2.6 V ~ 5.5 V 電流 - 限制（最小值）:350mA，550mA 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-UFDFN 裸露焊盤(pán)，8-TMLF? 供應(yīng)商器件封裝:8-TMLF?（2x2） 標(biāo)準(zhǔn)包裝:1 |
| MIC5350-MMYMT TR | 功能描述:低壓差穩(wěn)壓器 - LDO Dual 500mA/300mA LDO in 2mm x 2mm Thin MLF RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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