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| MAX1639 Datasheet, PDF (6/13 Pages) Maxim Integrated Products – High-Speed Step-Down Controller with Synchronous Rectification for CPU Power | |||
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High-Speed Step-Down Controller with
Synchronous Rectification for CPU Power
_______Standard Application Circuits
The predesigned MAX1639 circuit shown in Figure 1
meets a wide range of applications with output currents
up to 35A. Use Table 1 to select components appropri-
ate for the desired output current range, and adapt the
evaluation kit PC board layout as necessary. This cir-
cuit represents a good set of trade-offs between cost,
size, and efficiency while staying within the worst-case
specification limits for stress-related parameters, such
as capacitor ripple current.
The MAX1639 circuit was designed for the specified fre-
quencies. Do not change the switching frequency with-
out first recalculating component valuesâparticularly
the inductance, output filter capacitance, and RC1
resistance values.
___________________Detailed Description
The MAX1639 is a BiCMOS power-supply controller
designed for use in switch-mode, step-down (buck)
topology DC-DC converters. Synchronous rectification
provides high efficiency. It is intended to provide the
high precision, low noise, excellent transient response,
and high efficiency required in todayâs most demand-
ing applications.
R5
10â¦
VIN = 4.5V
TO 5.5V
C5
C6
0.1µF
10µF
TO VDD
VCC
C7
0.1µF
VDD
C1
D2
CMPSH-3
R6
100k
PWROK
BST
DH
N1
R4
(OPTIONAL)
C3
0.1µF
LX
MAX1639
R3
(OPTIONAL)
DL
FREQ
L1
R1
D1
N2
(OPTIONAL)
VOUT = 1.1V
TO 4.5V
C2
TO
AGND
REF
C4, 1.0µF
CERAMIC
CC2
CC2
RC1 0.056µF
1k
CC1
CC1
1000pF
PGND
CSH
CSL
FB
AGND
R7
R8
C8
Figure 1. Standard Application Circuit
6 _______________________________________________________________________________________
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