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參數(shù)資料
| 型號： | MIC2800 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Digital Power Management IC 2MHz, 600mA DC/DC w/Dual 300mA/300mA Low VIN LDOs |
| 中文描述： | 數(shù)字電源管理IC，600mA的直流/直流瓦特2MHz的/雙300mA/300mA低VIN LDO的 |
| 文件頁數(shù)： | 18/21頁 |
| 文件大?。?/td> | 645K |
| 代理商： | MIC2800 |
Micrel, Inc.
MIC2800
FB
Connect the feedback pin to VOUT.
June 2006
18
M9999-061406
(408) 955-1690
SW
The switch (SW) pin connects directly to the inductor
and provides the switching current necessary to operate
in PWM mode. Due to the high speed switching on this
pin, the switch node should be routed away from
sensitive nodes.
PGND
Power ground (PGND) is the ground path for the high
current PWM mode. The current loop for the power
ground should be as small as possible. Refer to the
layout considerations for more details.
SGND
Signal ground (SGND) is the ground path for the biasing
and control circuitry. The current loop for the signal
ground should be as small as possible. Refer to the
layout considerations for more details.
CSET
The SET pin is a current source output that charges a
capacitor that sets the delay time for the power-on reset
output from low to high. The delay for POR high to low
(detecting an undervoltage on any of the outputs) is
always minimal. The current source of 1.25μA charges a
capacitor up from 0V. When the capacitor reaches
1.25V, the output of the POR is allowed to go high. The
delay time in micro seconds is equal to the Cset in
picofarads.
POR Delay (μs) = CSET (pF)
CBYP
The internal reference voltage can be bypassed with a
capacitor to ground to reduce output noise and increase
power supply rejection (PSRR). A quick-start feature
allows for quick turn-on of the output voltage. The
recommended nominal bypass capacitor is 0.1μF, but it
can be increased, which will also result in an increase to
the start-up time.
Output Capacitor
LDO1 and LDO2 outputs require a 2.2μF ceramic output
capacitor for stability. The DC/DC switch mode regulator
requires a 2.2μF ceramic output capacitor to be stable.
All output capacitor values can be increased to improve
transient response, but performance has been optimized
for a 2.2μF ceramic on the LDOs and the DC/DC.
X7R/X5R
dielectric-type
recommended
because
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% to 60% respectively over their operating
temperature ranges.
ceramic
of
capacitors
their
are
temperature
Input Capacitor
A minimum 1μF ceramic is recommended on the VIN pin
for bypassing. X5R or X7R dielectrics are recommended
for the input capacitor. Y5V dielectrics lose most of their
capacitance over temperature and are therefore, not
recommended. A minimum 1μF is recommended close
to the VIN and PGND pins for high frequency filtering.
Smaller case size capacitors are recommended due to
their lower ESR and ESL. Please refer to layout
recommendations for proper layout of the input
capacitor.
Inductor Selection
The MIC2800 is designed for use with a 2.2μH inductor.
Proper selection should ensure the inductor can handle
the maximum average and peak currents required by the
load. Maximum current ratings of the inductor are
generally given in two methods; permissible DC current
and saturation current. Permissible DC current can be
rated either for a 40°C temperature rise or a 10% to 20%
loss in inductance. Ensure that the inductor selected can
handle the maximum operating current. When saturation
current is specified, make sure that there is enough
margin that the peak current will not saturate the
inductor. Peak inductor current can be calculated as
follows:
L
f
2
V
V
1
V
I
I
IN
OUT
OUT
OUT
PK
×
×
+
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2800-A4SYML | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC2800-A4SYML TR | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) DC-DC + 2 Linear Regulators with LowQ Mode (Lead Free) RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| MIC280-0BM6 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC280-0BM6 TR | 功能描述:IC SUPERVISOR THERMAL SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:IttyBitty® 標(biāo)準(zhǔn)包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-55°C ~ 125°C，外部傳感器 精確度:±2°C 本地（最大），±3°C 遠程（最大） 拓?fù)?ADC（三角積分型），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報:是 輸出風(fēng)扇:是 電源電壓:2.7 V ~ 5.5 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
| MIC280-0BM6TR | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
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