MIC2179-3.3BSM 데이터 시트보기 (PDF) - Micrel
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MIC2179-3.3BSM Datasheet PDF : 13 Pages
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Micrel, Inc.
Ordering Information
Part Number
Standard*
Pb-Free
Voltage
Temperature Range
Package
MIC2179BSM
MIC2179YSM
Adj.
-40°C to +85°C
20-Lead SSOP
MIC2179-3.3BSM MIC2179-3.3YSM
3.3V
-40°C to +85°C
20-Lead SSOP
MIC2179-5.0BSM MIC2179-5.0YSM
5.0V
-40°C to +85°C
20-Lead SSOP
* Standard product will be supported as Pb-Free IAW PCCN #040004 effective 1-1-2005 pending residual depletion.
Pin Configuration
PGND 1
PGND 2
SW 3
NC 4
PWM 5
PWRGD 6
FB 7
COMP 8
SGND 9
SGND 10
20 PGND
19 PGND
18 NC
17 VIN
16 VIN
15 EN
14 BIAS
13 SYNC
12 SGND
11 SGND
20-Lead Wide SSOP
MIC2179
Pin Description
Pin Number
1, 2, 19, 20
3
5
6
7
8
9–12
13
14
15
16, 17
4, 18
Pin Name
PGND
SW
PWM
PWRGD
FB
COMP
SGND
SYNC
BIAS
EN
VIN
NC
Pin Function
Power Ground: Connect all pins to central ground point.
Switch (Output): Internal power MOSFET output switches.
PWM/Skip-Mode Control (Input): Logic-level input. Controls regulator
operating mode. Logic low enables PWM mode. Logic high enables skip
mode. Do not allow pin to float.
Error Flag (Output): Open-drain output. Active low when FB input is 10%
below the reference voltage (VREF).
Feedback (Input): Connect to output voltage divider resistors.
Compensation: Output of internal error amplifier. Connect capacitor or
series RC network to compensate the regulator control loop.
Signal Ground: Connect all pins to ground, PGND.
Frequency Synchronization (Input): Optional. Connect an external clock
signal to synchronize the oscillator. Leading edge of signal above 1.7V
terminates switching cycle. Connect to SGND if not used.
Internal 3.3V Bias Supply: Decouple with 0.01µF bypass capacitor to
SGND. Do not apply any external load.
Enable (Input): Logic high enables operation. Logic low shuts down
regulator. Do not allow pin to float.
Supply Voltage (Input): Requires bypass capacitor to PGND. Both pins
must be connected to VIN.
not internally connected.
June 2009
2
M9999-063009
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