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| MAX1638 Datasheet, PDF (7/16 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
R5
10â¦
C5
C6
0.1µF
10µF
TO VDD
VCC
C7
0.1µF
VDD
C1
D2
CMPSH-3
R6
100k
PWROK
BST
D0
DH
C3
N1
0.1µF
D1
R4
(OPTIONAL)
D2
D3
LX
D4 MAX1638
LG
DL
FREQ
R3
(OPTIONAL)
L1
R1
D1
N2
(OPTIONAL)
TO
AGND
REF
C4, 1.0µF
CERAMIC
CC2
CC2
RC1 0.056µF
1k
CC1
CC1
1000pF
PGND
CSH
CSL
NDRV
PDRV
FB
AGND
VIN = 5V
C8
1µF
P1 R2
C2
VOUT = 1.3V
TO 3.5V
LOCAL
BYPASSING
LOAD
N3
Figure 1. Standard Application Circuit
_____Standard Application Circuits
The predesigned MAX1638 circuit shown in Figure 1
meets a wide range of applications with output currents
up to 19A and higher. Use Table 1 to select compo-
nents appropriate for the desired output current range,
and adapt the evaluation kit PC board layout as neces-
sary. This circuit represent 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 MAX1638 circuit was designed for the specified
frequency. Do not change the switching frequency
without first recalculating component valuesâparticu-
larly the inductance, output filter capacitance, and RC1
resistance values. Table 2 lists the voltage adjustment
DAC codes.
_______________Detailed Description
The MAX1638 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.
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