參數(shù)資料
型號： MAX1742-MAX1842
廠商： Maxim Integrated Products, Inc.
元件分類： 數(shù)字信號處理
英文描述： Replaced by TMS320C6410 : Digital Signal Processor 40-PDIP 0 to 0
中文描述： 1A/2.7A的1MHz，降壓型同步整流和內部開關穩(wěn)壓器
文件頁數(shù)： 10/16頁
文件大?。?/td> 597K
代理商： MAX1742-MAX1842
M
1A/2.7A, 1MHz, Step-Down Regulators with
Synchronous Rectification and Internal Switches
10
______________________________________________________________________________________
Synchronous Rectification
In a step-down regulator without synchronous rectifica-
tion, an external Schottky diode provides a path for cur-
rent to flow when the inductor is discharging. Replacing
the Schottky diode with a low-resistance NMOS syn-
chronous switch reduces conduction losses and
improves efficiency.
The NMOS synchronous-rectifier switch turns on follow-
ing a short delay after the PMOS power switch turns off,
thus preventing cross conduction or
“
shoot through.
”
In
V
CC
470pF
2.2
μ
F
1
μ
F
10
μ
F
10
FBSEL
0.01
μ
F
FEEDBACK
SELECTION
CURRENT
SENSE
PWM LOGIC
AND
DRIVERS
SS
IN
FB
V
IN
3.0V TO 5.5V
LX
PGND
TOFF
R
TOFF
GND
NOTE:
HEAVY LINES DENOTE HIGH-CURRENT PATHS.
REF
REF
SUMMING
COMPARATOR
REF
REF
COMP
SKIP
SHDN
TIMER
V
IN
CURRENT
SENSE
G
m
C
OUT
V
OUT
MAX1742
MAX1842
Figure 2. Functional Diagram
TOFF
COMP
V
CC
FBSEL
SHDN
IN
PGND
GND
REF
SS
LX
FB
MAX1742
R
TOFF
1
μ
F
0.01
μ
F
L
2.2
μ
F
470pF
10
INPUT
C
IN
= 10
μ
F (MAX1742)
C
IN
= 33
μ
F (MAX1842)
OUTPUT
C
OUT
= 47
μ
F (MAX1742)
C
OUT
= 150
μ
F (MAX1842)
V
OUT
= 2.5V, FBSEL = V
CC
V
OUT
= 1.8V, FBSEL = REF
V
OUT
= 1.5V, FBSEL = FLOATING
Figure 1. Typical Circuit
相關PDF資料
PDF描述
MAX1742EEE Replaced by TMS320C6410 :
MAX1843 2.7A, 1MHz, Low-Voltage, Step-Down Regulator with Internal Synchronous Rectification in QFN Package
MAX1843EGI 2.7A, 1MHz, Low-Voltage, Step-Down Regulator with Internal Synchronous Rectification in QFN Package
MAX1845 Dual, High-Efficiency, Step-Down Controller with Accurate Current Limit
MAX1845EEI Dual, High-Efficiency, Step-Down Controller with Accurate Current Limit
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