Rainbow Electronics MAX1717 - Manual (Page 15)

MAX1717
Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
______________________________________________________________________________________ 15
REF
-7%
FROM
D/A
REF
REF
D0 A/B D1 D2 D3 D4 TIME
10k
ERROR
AMP
TOFF
TON
REF
+12%
FB
R-2R
D/A CONVERTER
CHIP SUPPLY
g m g m g m
GNDS
CC
FBS
VGATE
ON-TIME
COMPUTE
TON
1-SHOT
1-SHOT
TRIG
V
BATT
2V TO 28V
TRIG
Q
Q
S
R
2V
REF
REF
FB
GND
+5V
OUTPUT
DL
V CC
V DD
LX
ZERO CROSSING
CURRENT
LIMIT
DH
BST
I LIM
REF
+5V
+5V
Q
OVP/UVP
DETECT
SKP/SDN
TON
V+
70k
Σ
MAX1717
S
R
Q
120k
MUX AND SLEW CONTROL
9
1
Figure 2. Functional Diagram