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參數(shù)資料
| 型號(hào)： | MIC5332-2.8/2.8YMT |
| 廠商： | MICREL INC |
| 元件分類： | 固定正電壓多路輸出LDO穩(wěn)壓器 |
| 英文描述： | DUAL OUTPUT, FIXED POSITIVE LDO REGULATOR, DSO8 |
| 封裝： | 2 X 2 MM, GREEN, MLF-8 |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 376K |
| 代理商： | MIC5332-2.8/2.8YMT |
Micrel, Inc.
MIC5332
April 2008
8
M9999-042108-B
Application Information
MIC5332 is a dual 300mA LDO, with an integrated
Power On Reset (POR) for the second regulator. The
MIC5332 regulator is fully protected from damage due to
fault conditions, offering linear current limiting and
thermal shutdown.
Input Capacitor
The MIC5332 is a high-performance, high bandwidth
device. Therefore, it requires a well-bypassed input
supply for optimal performance. A 1F 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 MIC5332 requires an output capacitor of 1F 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 1F 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
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.
No-Load Stability
Unlike many other voltage regulators, the MIC5332 will
remain stable and in regulation with no load. This is
especially import in CMOS RAM keep-alive applications.
Enable/Shutdown
The MIC5332 comes 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 has a Power On Reset status pin
(POR2). This pin is an open drain output. When LDO2 is
enabled an active low POR2 indicates an under voltage
condition on VOUT2.
The POR2 status signal can be programmed for a delay
of 1sec/F by placing a capacitor from the CSET2 pin to
ground. Zero delay is added by leaving the CSET2 pin
open circuit.
Thermal Considerations
The MIC5332 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. For example if the input
voltage is 3.6V, the output voltage is 3.0V for VOUT1, 2.8V
for VOUT2 and the output current = 300mA. The actual
power dissipation of the regulator circuit can be
determined using the equation:
PD = (VIN – VOUT1) IOUT1 + (VIN – VOUT2) I OUT2 + 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 = (3.6V – 3.0V) × 300mA + (3.6V -2.8) × 300mA
PD = 0.42W
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:
=
JA
A
J(MAX)
D(MAX)
θ
T
P
TJ(max) = 125°C, and the maximum junction temperature
of the die, θJA, thermal resistance = 90°C/W.
Substituting PD for PD(max) and solving for the ambient
operating temperature will give the maximum operating
conditions for the regulator circuit. The junction-to-
ambient thermal resistance for the minimum footprint is
90°C/W.
The maximum power dissipation must not be exceeded
for proper operation.
For example, when operating the MIC5332-PMYMT at
an input voltage of 3.6V and 300mA loads at each output
with a minimum footprint layout, the maximum ambient
operating temperature TA can be determined as follows:
0.42W = (125°C – TA)/(90°C/W)
TA = 87.2°C
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| MIC5332-G4YMT TR | 功能描述:低壓差穩(wěn)壓器 - LDO Micro-Power High Performance Dual 300mA ULDO 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: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MIC5332-G4YMT-TR | 功能描述:Linear Voltage Regulator IC Positive Fixed 2 Output 1.8V, 1.2V 300mA 8-MLF? (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:1.8V，1.2V 電流 - 輸出:300mA 電壓 - 跌落（典型值）:0.12V @ 300mA 穩(wěn)壓器數(shù):2 電壓 - 輸入:2.3 V ~ 5.5 V 電流 - 限制（最小值）:350mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤，8-MLF? 供應(yīng)商器件封裝:8-MLF?（2x2） 標(biāo)準(zhǔn)包裝:1 |
| MIC5332-J4YMT TR | 功能描述:低壓差穩(wěn)壓器 - LDO Dual 300mA micropower ULDO with POR 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: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MIC5332-J4YMTTR | 制造商:Micrel Inc 功能描述:Dual 300mA ULDO 2.5V/1.2V 2x2mmThin MLF8 |
| MIC5332-J4YMT-TR | 功能描述:Linear Voltage Regulator IC Positive Fixed 2 Output 2.5V, 1.2V 300mA 8-MLF? (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:2.5V，1.2V 電流 - 輸出:300mA 電壓 - 跌落（典型值）:0.12V @ 300mA 穩(wěn)壓器數(shù):2 電壓 - 輸入:2.3 V ~ 5.5 V 電流 - 限制（最小值）:350mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤，8-MLF? 供應(yīng)商器件封裝:8-MLF?（2x2） 標(biāo)準(zhǔn)包裝:1 |
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