MIC2125 Datasheet, PDF (2/34 Pages) Microchip Technology – 28V Synchronous Buck Controllers Featuring Adaptive ON-Time Control

MIC2125/6
Typical Application Circuit
MIC2125/6
3x3 QFN
4.7μF
EN
PG
V_OUT
PVDD
FREQ
VIN
VDD
BST
MIC2125/6
AGND
DH
EN
SW
PG
56.2kΩ
10kΩ
OVP
FB
DL
PGND
ILIM
1.2kΩ
V_IN
4.5V TO 28V
2.2μF
×3
220μF
0.1μF
0.72μH
V_OUT
3.3V/20A
90.9kΩ
0.1μF
10kΩ 470pF 100μF 470μF
2.26kΩ
Functional Block Diagram
PVDD
MIC2125/26
4.7μF
VDD
V_IN
LDO
VDD
UVLO
MODIFIED
T_OFF
100kΩ
EN
EN
CONTROL
LOGIC
TIMER
SOFT–START
FIXED T_ON
ESTIMATE
HSD
PVDD
LSD
OVP
VDD
V
REF
0.6V
SOFT
START
THERMAL
SHUTDOWN
COMP
CL
DETECTION
COMPENSATION
g_m EA
49.9kΩ
PG
PG
8%
92%
V_REF
0.6V
VIN
FREQ
BST
DH
Q1
SW
DL
Q3
PGND
ILIM
V_IN
4.5V TO 28V
R19
2.2μF
220μF
×2
R20
0.1μF
0.72μH
1.2kΩ
90.9kΩ ^R1
10kΩ
0.1μF
V
OUT
3.3V/20A
470pF
470μF
100μF
R2
2.26kΩ
FB
AGND
DS20005459B-page 2
 2015 Microchip Technology Inc.