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參數(shù)資料
| 型號： | MAX1842 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 1A/2.7A, 1MHz, Step-Down Regulators with Synchronous Rectification and Internal Switches |
| 中文描述： | 1A/2.7A、1MHz、降壓型穩(wěn)壓器，內(nèi)置同步整流與開關 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 597K |
| 代理商： | 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 |
|---|---|
| MAX1742 | Replaced by TMS320C6410 : Digital Signal Processor 40-PDIP -40 to 85 |
| MAX1742-MAX1842 | Replaced by TMS320C6410 : Digital Signal Processor 40-PDIP 0 to 0 |
| 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 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1842EEE | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1842EEE+ | 功能描述:直流/直流開關調(diào)節(jié)器 1/2.7A 1MHz Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX1842EEE+T | 功能描述:直流/直流開關調(diào)節(jié)器 1/2.7A 1MHz Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX1842EEE-T | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1842EEE-TG074 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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