MIC28512 Datasheet, PDF (2/34 Pages) Microchip Technology – 70V, 2A Synchronous Buck Regulator

MIC28512
Typical Application Circuit
MIC28512
3x4 FQFN
V_IN
5.5V – 70V
VDD PVDD
BST
EN
ILIM
PVIN
SW
VIN ^{MIC28512 LX}
FREQ
FB
AGND
PGND
V_OUT
5V (0A TO 2A)
Functional Block Diagram
VIN
C_VDD
D_BST
C_IN
VIN
VDD PVDD
PVIN
17
19
20
4, 7, 8, 9, 25
BST
LINEAR
REGULATOR
UVLO
6
R_BST
3 DH
OFF ON
16
R3
EN
24
R4
FREQ
3.3V
THERMAL
SHUTDOWN
FIXED T_ON
ESTIMATION
SOFT-START
CONTROL _ZCD
LOGIC
PVDD
R_PGOOD
15
PGOOD
POWER GOOD
COMPARATOR
CURRENT
LIMIT
DETECTION
X90%
V_REF
0.8V
13
AGND
14
FB
M1
C_BST
L
12, SW
21,
27
LX
5
1 DL
M2
R_LIM
PGND
10,
11,
22,
23,
26
R_INJ
C_OUT
2
PGND
18
C_INJ
ILIM
R1
VOUT
C_FF
R2
DS20005524A-page 2
 2016 Microchip Technology Inc.