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| MIC2177 Datasheet, PDF (6/16 Pages) Micrel Semiconductor – 2.5A Synchronous Buck Regulator | |||
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MIC2177
Block Diagram
Micrel
VIN
4.5V to 16.5V
CIN
VIN 1 2 9
UVLO,
Thermal
Shutdown
Enable
Shutdown
EN
20
BIAS
19
0.01µF
3.3V
Regulator
internal
supply
voltage
SYNC
18
200kHz
Oscillator
Auto-Mode
AUTO
PWM
11
2.2nF
COMP
13
RC
CC
MIC2177 [Adjustable]
Output
Control
Logic
ILIMIT
Comp.
PWM/
Skip-Mode
Select Logic
IMIN
Comp.
CORRECTIVE RAMP
3.3V
10µA
RESET PULSE
R
Q
S
PWM
Comp.
ISENSE
Amp.
100mâ¦
P-channel
100mâ¦
N-channel
IMIN
Thrshld.
Low Output
Comp.
Skip-Mode
Comp.
40mV
VOUT
R1
1.245
R2
SW
3
L1
8
1
VOUT
D
PGND
4
5
6
7
COUT
Bold lines indicate
high current traces
OUT
10
R1
FB
12
R2
Error
Amp.
VREF
1.245V
SGND 14 15 16 17
MIC2177
6
April 1999
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