MIC2179-3.3YSM TR Micrel Inc, MIC2179-3.3YSM TR Datasheet - Page 2

• Manufacturer Part Number: MIC2179-3.3YSM TR
• Description: IC REG SYNCBUCK 1.5A 3.3V 20SSOP
• Manufacturer: Micrel Inc
• Type: Step-Down (Buck)r

Specifications of MIC2179-3.3YSM TR

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 3.3V
• Current - Output: 1.5A
• Frequency - Switching: 200kHz
• Voltage - Input: 4.5 ~ 16.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: MIC2179-3.3YSMTR; MIC2179-3.3YSMTR

Ordering Information
* Standard product will be supported as Pb-Free IAW PCCN #040004 effective 1-1-2005 pending residual depletion.
Pin Configuration
Pin Description
June 2009
Standard*
MIC2179BSM
MIC2179-3.3BSM MIC2179-3.3YSM
MIC2179-5.0BSM MIC2179-5.0YSM
Pin Number
1, 2, 19, 20
16, 17
9–12
4, 18
13
14
15
3
5
6
7
8
Part Number
Pb-Free
MIC2179YSM
Pin Name
PWRGD
PGND
COMP
SGND
SYNC
PWM
BIAS
VIN
SW
EN
NC
FB
P W R G D 6
C O M P
P G N D
P G N D
S G N D
S G N D
P W M
Voltage
S W
N C
F B
3.3V
5.0V
Adj.
1 0
1
2
3
4
5
7
8
9
20-Lead Wide SSOP
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
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
not internally connected.
2
Temperature Range
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
2 0
1 9
1 8
1 7
1 6
1 5
1 4
1 3
1 2
1 1 S G N D
IN
.
P G N D
P G N D
N C
V I N
V I N
E N
B I A S
S Y N C
S G N D
REF
).
20-Lead SSOP
20-Lead SSOP
20-Lead SSOP
Package
M9999-063009