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參數資料
| 型號： | 83F5958 |
| 英文描述： | IC-1.25A SWITCHING REGULATOR |
| 中文描述： | 集成電路1.25A的開關穩壓器 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 129K |
| 代理商： | 83F5958 |
1997
4-13
MIC2172/3172
Micrel
4
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).
The MIC2172/3172 is available in an 8-pin plastic DIP or
SOIC for –40
°
C to +85
°
C operation.
Features
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)
<1
μ
A quiescent current, shutdown mode (MIC3172)
TTL shutdown compatibility (MIC3172)
External frequency synchronization (MIC2172)
External frequency trim (MIC2172)
Fits most LT1172 sockets (see applications info)
Applications
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)
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.
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.
The MIC3172 is for applications that require on/off control of
the regulator. The MIC3172 is externally shutdown by
applying a TTL low signal to EN (enable). When disabled, the
MIC3172 draws only leakage current (typically less than
1
μ
A). EN must be high for normal operation. For applications
not requiring control, EN must be tied to V
IN
or TTL high.
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
possible to avoid the audible beat frequencies that result from
the unequal oscillator frequencies of independent SMPS
regulators.
A reference signal can be supplied by one MIC2172 desig-
nated as a master. To insure locking of the slave’s oscillators,
the reference oscillator frequency must be higher than the
MIC2172/3172
100kHz 1.25A Switching Regulators
Preliminary Information
Typical Applications
C4
470μF
D2
1N5818
C1
22μF
C2
1μF
R3
1k
R4*
V
OUT
5V, 0.25A
* Optional voltage clipper (may be req’d if T1 leakage inductance too high)
C3*
D1*
R1
3.74k
1%
R2
1.24k
1%
V
IN
4V to 6V
T1
Enable
Shutdown
1:1.25
L
PRI
= 100μH
MIC3172
V
IN
V
SW
FB
EN
GND
P1 P2 S
COMP
Figure 2.
MIC3172 5V Flyback Converter
+5V
(4.75V min.)
D1
1N5822
MIC2172
V
IN
V
SW
FB
C1*
22μF
R3
1k
C3
1μF
R1
10.7k
1%
C2
470μF
V
+12V, 0.14A
L1
27μH
* Locate near MIC2172 when supply leads > 2"
R2
1.24k
1%
SYNC
GND
P1 P2 S
N/C
COMP
Figure 1.
MIC2172 5V to 12V Boost Converter
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