Rainbow Electronics MAX1545 - Manual (Page 40)

MAX1519/MAX1545
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
40 ______________________________________________________________________________________
INPUT*
7V TO 24V
OUTPUT
V CC
VROK
SHDN
OFS
STP_CPU#
POWER-
GOOD
OFF
ON
D0
DAC INPUTS
SUSPEND INPUTS
(FOUR-LEVEL LOGIC)
L1
C BST1
0.22 µF
N
H1
N H2
N L1
C IN
C2
1 µF
C REF
0.22 µF
R10
10 Ω
R11
100k Ω
C
CCV
47pF
C CCI
470pF
C BST2
0.22 µF
R27
20k
Ω
±1%
C3
100pF
R6
3.0k Ω
±1%
R1
3.0k
Ω
±1%
5V BIAS
SUPPLY
C1
2.2
µF
C OUT
C OUT
*LOWER INPUT VOLTAGES
REQUIRE ADDITIONAL
INPUT CAPACITANCE.
BST
DIODES
TIME
CCV
R SENSE1
1.5m Ω
N L2
R28
182k
Ω
±1%
R8
100k Ω
±1%
R4
1k Ω
±1%
R5
1k
Ω
±1%
POWER GROUND
ANALOG GROUND
MAX1519
MAX1545
C
IN
REF
TON
REF
R2
1k Ω
±1%
R3
1k
Ω
±1% R
TIME
64.9k Ω
D1
D2
D3
D4
CODE GND (DESKTOP P4)
S0
S1
L2
R SENSE2
1.5m Ω
BSTM
DHM
LXM
DLM
PGND
GND
CMN
CMP
V+
OAIN+
OAIN-
REF (300kHz)
FB
CCI
CSP
CSN
BSTS
DHS
LXS
DLS
GNDS
V
DD
U1
SKIP
PWM
SKIP
SUS
ILIM
R9
30.1k Ω
±1%
Figure 12a. Standard 4-Phase Desktop P4 Application Circuit (1st and 2nd Phases—MAX1519/MAX1545 Master)