- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383604 > MIC2205-1.58YML (MICREL INC) 2MHz PWM Synchronous Buck Regulator with LDO Standby Mode PDF資料下載
參數(shù)資料
| 型號： | MIC2205-1.58YML |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2MHz PWM Synchronous Buck Regulator with LDO Standby Mode |
| 中文描述： | 2 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, LEAD FREE, MLF-10 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 453K |
| 代理商： | MIC2205-1.58YML |
Micrel, Inc.
MIC2205
Functional Description
April 2005
12
M9999-041105
www.micrel.com
VIN
VIN provides power to the MOSFETs for the switch
mode regulator section, along with the current
limiting sensing. Due to the high switching speeds, a
1
μ
F capacitor is recommended close to VIN and the
power ground (PGND) pin for bypassing. Please
refer to layout recommendations.
AVIN
Analog V
IN
(AVIN) provides power to the LDO
section and the bias through an internal 6 Ohm
resistor. AVIN and VIN must be tied together.
Careful layout should be considered to ensure high
frequency switching noise caused by VIN is reduced
before reaching AVIN.
LDO
The LDO pin is the output of the linear regulator and
should be connected to the output. In LOWQ mode
(LOWQ<1.5V), the LDO provides the output voltage.
In PWM mode (LOWQ>1.5V) the LDO pin is high
impedance.
EN
The enable pin provides a logic level control of the
output. In the off state, supply current of the device
is greatly reduced (typically <1
μ
A). Also, in the off
state, the output drive is placed in a "tri-stated"
condition, where both the high side P-channel
Mosfet and the low-side N-channel are in an “off” or
non-conducting state. Do not drive the enable pin
above the supply voltage.
LOWQ
The LOWQ pin provides a logic level control
between the internal PWM mode and the low noise
linear regulator mode. With LOWQ pulled low
(<0.5V), quiescent current of the device is greatly
reduced by switching to a low noise linear regulator
mode that has a typical I
Q
of 18
μ
A. In linear (LDO)
mode the output can deliver 60mA of current to the
output. By placing LOWQ high (>1.5V), this
transitions the device into a constant frequency
PWM buck regulator mode. This allows the device
the ability to efficiently deliver up to 600mA of output
current at the same output voltage.
BIAS
The BIAS pin supplies the power to the internal
power to the control and reference circuitry. The bias
is powered from AVIN through an internal 6
resistor. A small 0.1
μ
F capacitor is recommended
for bypassing.
FB
The feedback pin (FB) provides the control path to
control the output. For adjustable versions, a resistor
divider connecting the feedback to the output is used
to adjust the desired output voltage. The output
voltage is calculated as follows:
R1
R2
+
1
where V
REF
is equal to 1.0V.
A feedforward capacitor is recommended for most
designs using the adjustable output voltage option.
To reduce battery current draw, a 100K feedback
resistor is recommended from the output to the FB
pin (R1). Also, a feedforward capacitor should be
connected between the output and feedback (across
R1). The large resistor value and the parasitic
capacitance of the FB pin can cause a high
frequency pole that can reduce the overall system
phase margin. By placing a feedforward capacitor,
these
effects
can
be
Feedforward capacitance (C
FF
) can be calculated as
follows:
1
C
FF
×
×
π
For fixed options A feed forward capacitor from the
output to the FB pin is required. Typically a 100pF
small ceramic capacitor is recommended
V
OUT
=
V
REF
×
significantly
reduced.
160kHz
R1
2
=
SW
The switch (SW) pin connects directly to the inductor
and provides the switching current nessasary 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 and
separate from the Analog ground (AGND) loop.
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 separate from the Power
ground
(PGND)
loop.
considerations for more details.
Refer
to
the
layout
相關PDF資料 |
PDF描述 |
|---|---|
| MIC2205-1.5YML | 2MHz PWM Synchronous Buck Regulator with LDO Standby Mode |
| MIC2205-1.85YML | 2MHz PWM Synchronous Buck Regulator with LDO Standby Mode |
| MIC2205-1.8YML | 2MHz PWM Synchronous Buck Regulator with LDO Standby Mode |
| MIC2205 | 2MHz PWM Synchronous Buck Regulator with LDO Standby Mode |
| MIC2205YML | 2MHz PWM Synchronous Buck Regulator with LDO Standby Mode |
相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2205BML | 功能描述:IC REG BUCK SYNC ADJ 0.6A 10MLF RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關:52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應商設備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| MIC2205BML TR | 功能描述:IC REG BUCK SYNC ADJ 0.6A 10MLF RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關:52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應商設備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| MIC2205YML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2MHz PWM Synchronous Buck Regulator with LDO Standby Mode |
| MIC2205YML TR | 功能描述:直流/直流開關調(diào)節(jié)器 2MHz Synchronous Buck Regulator - low Q Mode (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC2205YML-EV | 功能描述:MIC2205 - DC/DC, Step Down 1, Non-Isolated Outputs Evaluation Board 制造商:microchip technology 系列:- 零件狀態(tài):有效 主要用途:DC/DC，步降 輸出和類型:1，非隔離 功率 - 輸出:- 電壓 - 輸出:1.8V 電流 - 輸出:600mA 電壓 - 輸入:2.7 V ~ 5.5 V 穩(wěn)壓器拓撲:降壓 頻率 - 開關:2MHz 板類型:完全填充 所含物品:板 使用的 IC/零件:MIC2205 標準包裝:1 |
發(fā)布緊急采購，3分鐘左右您將得到回復。