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MIC2172_05

更新时间： 2024-02-02 16:09:34
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麦瑞 - MICREL 稳压器开关
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17页 158K
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100kHz 1.25A Switching Regulators

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MIC2172_05 数据手册

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MIC2172/3172  
Micrel, Inc.  
MIC2172/3172  
100kHz 1.25A Switching Regulators  
slave’s. The master MIC2172’s oscillator frequency is in-  
creased up to 135kHz by connecting a resistor from SYNC to  
ground (see applications information).  
General Description  
The MIC2172 and MIC3172 are complete 100kHz SMPS  
current-mode controllers with internal 65V 1.25A power  
switches. The MIC2172 features external frequency syn-  
chronization or frequency adjustment, while the MIC3172  
features an enable/shutdown control input.  
The MIC2172/3172 is available in an 8-pin plastic DIP or  
SOIC for –40°C to +85°C operation.  
Features  
Although primarily intended for voltage step-up applications,  
the floating switch architecture of the MIC2172/3172 makes  
it practical for step-down, inverting, and Cuk configurations  
as well as isolated topologies.  
Operating from 3V to 40V, the MIC2172/3172 draws only  
7mA of quiescent current making it attractive for battery  
operated supplies.  
• 1.25A, 65V internal switch rating  
• 3V to 40V input voltage range  
• Current-mode operation  
• Internal cycle-by-cycle current limit  
• Thermal shutdown  
• Low external parts count  
• Operates in most switching topologies  
• 7mA quiescent current (operating)  
• <1µA quiescent current, shutdown mode (MIC3172)  
• TTL shutdown compatibility (MIC3172)  
• External frequency synchronization (MIC2172)  
• External frequency trim (MIC2172)  
• Fits most LT1172 sockets (see applications info)  
The MIC3172 is for applications that require on/off control of  
the regulator. The MIC3172 is externally shutdown by  
applyingaTTLlowsignaltoEN(enable). Whendisabled, the  
MIC3172 draws only leakage current (typically less than  
1µA). ENmustbehighfornormaloperation. Forapplications  
not requiring control, EN must be tied to V or TTL high.  
IN  
Applications  
The MIC2172 is for applications requiring two or more SMPS  
regulators that operate from the same input supply. The  
MIC2172 features a SYNC input which allows locking of its  
internal oscillator to an external reference. This makes it  
possibletoavoidtheaudiblebeatfrequenciesthatresultfrom  
the unequal oscillator frequencies of independent SMPS  
regulators.  
A reference signal can be supplied by one MIC2172 desig-  
natedasamaster. Toinsurelockingoftheslave’soscillators,  
the reference oscillator frequency must be higher than the  
• Laptop/palmtop computers  
• Toys  
• Hand-held instruments  
• Off-line converter up to 50W  
(requires external power switch)  
• Predriver for higher power capability  
• Master/slave configurations (MIC2172)  
Typical Applications  
VOUT  
VIN  
4V to 6V  
+5V  
5V, 0.25A  
T1  
(4.75V min.)  
D2  
C1  
R4*  
C3*  
D1*  
C1*  
L1  
1N5818  
22µF  
22µF  
R1  
27µH  
C4  
3.74k  
1%  
VOUT  
470µF  
VIN  
D1  
VIN  
+12V, 0.14A  
Enable  
VSW  
N/C  
SYNC  
MIC2172  
VSW  
EN  
Shutdown  
R1  
1:1.25  
PRI = 100µH  
1N5822  
10.7k  
1%  
L
MIC3172  
COMP  
FB  
COMP  
FB  
GND  
R2  
GND  
R3  
1k  
R2  
C2  
P1 P2  
S
R3  
1k  
1.24k  
P1 P2  
S
1.24k  
1%  
470µF  
1%  
C3  
C2  
1µF  
1µF  
* Locate near MIC2172 when supply leads > 2"  
* Optional voltage clipper (may be req’d if T1 leakage inductance too high)  
Figure 1.  
Figure 2.  
MIC2172 5V to 12V Boost Converter  
MIC3172 5V Flyback Converter  
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com  
M9999-042205  
April 2005  
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