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MIC2800-1.87/1.2/2.8YML

更新时间： 2024-09-30 07:17:03
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麦瑞 - MICREL /
页数 文件大小 规格书
20页 507K
描述
Digital Power Management IC 2MHz, 600mA DC/DC w/Dual 300mA/300mA Low VIN LDOs

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MIC2800-1.87/1.2/2.8YML 数据手册

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MIC2800  
Digital Power Management IC  
2MHz, 600mA DC/DC w/Dual  
300mA/300mA Low VIN LDOs  
• Integrated power-on reset (OR function for all outputs)  
General Description  
–
Adjustable delay time  
• LOWQ® mode  
The MIC2800 is a high performance power management  
IC, giving three output voltages with maximum efficiency.  
Integrating a 2MHz DC/DC converter with an LDO post  
regulator, the MIC2800 gives two high efficiency outputs  
with a second, 300mA LDO for maximum flexibility. The  
MIC2800 features a LOWQ® mode, reducing the total  
current draw while in this mode to less than 30µA. In  
LOWQ® mode, the output noise of the DC to DC converter  
is 75µVRMS, significantly lower than other converters which  
use a PFM light load mode that can interfere with sensitive  
RF circuitry.  
–
30µA Total IQ when in LOWQ® mode  
• Tiny 16-pin 3mm x 3mm MLF® package  
DC to DC Converter  
• Output current to 600mA in PWM mode  
• LOWQ® Mode: NO NOISE Light load mode  
–
75µVRMS output noise in LOWQ® mode  
• 2MHz PWM operation in normal mode  
• >90% efficiency  
LDOs  
• LDO1 input voltage directly connected to DC/DC  
converter output voltage for maximum efficiency  
The DC to DC converter uses small values of L and C to  
reduce board space but still retains efficiencies over 90%  
at load currents up to 600mA.  
–
–
–
Ideal for 1.8V to 1.5V conversion  
300mA output current from 1.8V input  
Output voltage down to 0.8V  
The MIC2800 is a µCap design, operating with very small  
ceramic output capacitors and inductors for stability,  
reducing required board space and component cost and it  
is available in fixed output voltages in the 16-pin  
3mm x 3mm MLF® leadless package.  
• LDO2 – 300mA output current capable  
• Thermal Shutdown Protection  
• Current Limit Protection  
Applications  
• Mobile phones  
• PDAs  
• GPS receivers  
• Digital still cameras  
• Portable media players  
Data sheets and support documentation can be found on  
Micrel’s web site at: www.micrel.com.  
Features  
• 2.7V to 5.5V input voltage range  
• 2MHz DC/DC converter and two stand-alone LDOs  
–
LDO1: Low input voltage is powered directly from  
DC/DC converter for highest efficiency  
Typical Application  
DC/DC 1.8V  
Efficiency  
OUT  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
MIC2800-xxxYML  
3.6V  
4.2V  
3V  
VIN  
VIN  
VIN  
LDO  
SW  
FB  
VOUT  
2.7V to 5.5V  
Memory/DSP  
Baseband  
4.7µF/  
6.3V  
2.2µH  
2.2µF  
ceramic  
EN1  
LOWQ  
EN2  
CBYP  
CBIAS  
LDO1  
LDO2  
POR  
CSET  
L = 2.2µH  
= 2.2µF  
COUT2  
2.2µF  
ceramic  
COUT1  
2.2µF  
ceramic  
CBYP  
0.01µF  
C
OUT  
/LowQ = V  
PGND  
SGND  
IN  
CBIAS  
0.1µF  
CSET  
0.01µF  
0
100 200 300 400 500 600  
OUTPUT CURRENT (mA)  
GND  
GND  
LOWQ is a registered trademark of Micrel, Inc.  
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.  
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com  
M9999-090507-C  
September 2007  
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