Rainbow Electronics MAX1545 - Manual (Page 18)

MAX1519/MAX1545
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
18 ______________________________________________________________________________________
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
1.5k Ω
±1%
R1
1.5k
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
1.0m 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
1.0m 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
49.9k Ω
±1%
Figure 1. Standard Two-Phase Desktop P4 Application Circuit