XR79103 Datasheet, PDF (2/9 Pages) Exar Corporation – 22V, 3A Synchronous Step-Down COT Power Module

April 2016
XR79103
22V, 3A Synchronous Step-Down COT Power Module
VIN
R1 10k
2-3=DCM/CCM
3
2
1
1-2=CCM _J1
SS
PGOOD
VCC
AGND
D1 MMSZ4685-TP
C
A
R2 24.3k, 1%
C11
0.22uF
R3 35.7k, 1%
SW
CSS
47nF
RON
7.15k
RLIM
0.8k
RPGOOD 10k
FB
U1A
1
2
3
SS
PGood
FB
4 _AGND
5
6
7
VIN
VCC
PGND
8 _SW
9
10
PGND
PGND
BST
AGND
43
44
SW
47
PVin
45
46
SW
VOUT
48
EN
CBST
PVIN ³¹
PGND
PGND
30
29
SW
SW
SW
SW
28
27
26
25
VOUT
VOUT
VOUT
24
23
22
VIN = 4.5V - 22V
C1
C2
C3
C4
0.1uF 22uF
VIN
C5
VIN+
VIN-
RR 42k CR 2.2nF
22nF
CAC
600kHz, 1.2V, 3A
C6
C7
C8
C9
C10
47uF 47uF 0.1uF
VOUT+
VOUT-
VCC
VIN
VCC
45 _PVin
RVIN
R5VIN
VIN
0
CIN ^k
CVCC
SW
46 _SW
44 _BST2
0.1uF
4.7uF
U1B
XR79103
RBODE
0
VOUT ⁴⁸
SW ⁴⁷
AGND ⁴³
XR79103
VOUT
SW
CSNB
nF
C12
0.1uF
RSNB
Ohm
CFF
RFF
RFB1
2k
RFB2
2k
Fig. 1: XR79103 Evaluation Board Schematics
FB
FB
Rev. 1A
PIN CONFIGURATION
Fig. 2: XR79103 Pin Assignment
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. [phone] – Fax. [phone]