MIC2179 Datasheet, PDF (2/16 Pages) Micrel Semiconductor – 1.5A Synchronous Buck Regulator

MIC2179
Ordering Information
Part Number
MIC2179BSM
MIC2179-3.3BSM
MIC2179-5.0BSM
Voltage
Adjustable
3.3V
5.0V
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
20-lead SSOP
20-lead SSOP
20-lead SSOP
Micrel
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
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 (V_REF).
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 V_IN.
not internally connected.
MIC2179
2
June 1998