参数资料
型号: MAX1639ESE+T
厂商: Maxim Integrated Products
文件页数: 6/13页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 16-SOIC
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 1.2MHz
占空比: 84%
电源电压: 4.5 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
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-
R5
10 ?
out first recalculating component values—particularly
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 today’s most demand-
ing applications.
V IN = 4.5V
TO 5.5V
C5
0.1 μ F
C6
10 μ F
C7
0.1 μ F
C1
D2
TO V DD
V CC
V DD
CMPSH-3
R6
100k
PWROK
BST
C3
DH
R4
(OPTIONAL)
N1
0.1 μ F
MAX1639
LX
L1
R1
V OUT = 1.1V
TO 4.5V
R3
(OPTIONAL)
D1
C2
C4, 1.0 μ F
CERAMIC
FREQ
REF
CC2
DL
PGND
CSH
CSL
N2
(OPTIONAL)
CC2
RC1 0.056 μ F
FB
R7
TO
AGND
1k
CC1
CC1
AGND
R8
1000pF
Figure 1. Standard Application Circuit
C8
6
_______________________________________________________________________________________
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