MIC2128 Datasheet, PDF (2/32 Pages) Microchip Technology – 75V, Synchronous Buck Controller Featuring Adaptive On-Time Control with External Soft Start

MIC2128
Typical Application
4.7 µF
2.2ё
4.7 µF
VIN
10 nF
100 kё
VIN
60 kё
PVDD
VDD
MIC2128
PG
EN
SS
VIN
0.1 µF
DH
BST
0.1 µF
SW
ILIM _{1.5 kё}
DL
FB
FREQ
AGND
EXTVDD
PGND
VOUT
1 µF
VIN
4.5V to 75V
2.2 µFX3
Q1
L1
10 µH
0.1 µF
Q2
18 kё
7.5 kё
+33C01 _µF
47 µF
VOUT
5V@5A
4.7 nF
1 kё
Q1,Q2: SiR878ADP
L1: SRP1265A-100M, Bourns
C1: 10SVP330M
Functional Block Diagram
EXTVDD
9
LINEAR
REGULATOR
FREQ 11
THERMAL
SHUTDOWN
TON
ESTIMATION
FB 13
1.3 µA
SS ¹²
COMPENSATION
gm
VREF
0.6V
PG 1
0.9
VREF
FB
VDD
PVDD
EN
VIN
15
8
10
16
UVLO
LINEAR
REGULATOR
4 BST
Control
Logic
Negative Current
Limit
PVDD
CURRENT LIMIT
DETECTION
96 µA
5 DH
3 SW
7 DL
2 I_LIM
6 P_GND
14
AGND
DS20005620A-page 2
 2016 Microchip Technology Inc.