Rainbow Electronics MAX1717 - Manual (Page 12)

MAX1717
Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
12 ______________________________________________________________________________________
V CC
V BATT
7V TO 24V
+5V
BIAS SUPPLY
C2
6 x 470
µF
KEMET T510
POWER-GOOD
INDICATOR
L1
1 µH
A/B = LOW = 1.60V
A/B = HIGH = 1.35V
SKP/SDN
V+
22 1
2
3
21
20
19
18
24
23
14
13
4
5
11
12
7 15
D2
CMPSH-3
C6
1 µF
C7
0.1
µF
C4
1 µF
C3
470pF
TO V
CC
Q1
D1
R2
100k
Ω
Q2
C5
1 µF
R1
20 Ω C1
4 x 10 µF, 25V
D0
TIME
D1
D2
ON/OFF
CONTROL
DL
LX
BST
DH
GND
FB
FBS
GNDS
Q1 = IRF7811
Q2 = 2 x IRF7805
D1 = INTL RECT 10MQ040N
C1 = TAIYO YUDEN TMK432BJ106KM
C2 = KEMET T510X477M006
L1 = SUMIDA CEP125
VGATE
V DD
MAX1717
8
9
6
10
+5V
16
D3
17 D4
TON
REF
CC
A/B
ILIM
R7
120k Ω
100k Ω
TO V CC
HIGH/LOW
V
OUT
Figure 1. Standard Application Circuit