- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384690 > MAX618 (Maxim Integrated Products, Inc.) 3.3-V ABT Scan Test Devices With 18-Bit Universal Bus Transceivers 68-CFP -55 to 125 PDF資料下載
參數(shù)資料
| 型號(hào)： | MAX618 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3.3-V ABT Scan Test Devices With 18-Bit Universal Bus Transceivers 68-CFP -55 to 125 |
| 中文描述： | 28V、PWM、升壓型DC-DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大?。?/td> | 204K |
| 代理商： | MAX618 |
_______________ Detailed Desc ription
The MAX618 pulse-width modulation (PWM) DC-DC
converter with an internal 28V switch operates in a wide
range of DC-DC conversion applications including
boost, SEPIC, and flyback configurations. The MAX618
uses fixed-frequency PWM operation and Maxim’s pro-
prietary Idle Mode control to optimize efficiency over a
wide range of loads. It also features a shutdown mode
to minimize quiescent current when not in operation.
PWM Control S c heme and
Idle Mode Operation
The MAX618 combines continuous-conduction PWM
operation at medium to high loads and Idle Mode oper-
ation at light loads to provide high efficiency over a
wide range of load conditions. The MAX618 control
scheme actively monitors the output current and auto-
matically switches between PWM and Idle Mode to
optimize efficiency and load regulation. Figure 2 shows
a functional diagram of the MAX618’s control scheme.
The MAX618 normally operates in low-noise, continu-
ous-conduction PWM mode, switching at 250kHz. In
PWM mode, the internal MOSFET switch turns on with
each clock pulse. It remains on until either the error
comparator trips or the inductor current reaches the 2A
switch-current limit. The error comparator compares the
feedback-error signal, current-sense signal, and slope-
compensation signal in one circuit block. When the
switch turns off, energy transfers from the inductor to
M
28V, PWM, S tep-Up DC-DC Converter
_______________________________________________________________________________________________________
5
Pin Desc ription
PGND
ECB1Q503L
LX
FB
1
μ
F
4.7
μ
F
V
L
C
OUT
C
P
R1
R2
C
IND
V
IN
L
SHDN
GND
COMP
UP TO28V
3V TO28V
V
IN
C
COMP
MAX618
V
OUT
8V
12V
28V
R1
R2
C
IND
150
μ
F
100
μ
F
86
μ
F
L
C
OUT
150
μ
F
100
μ
H
33
μ
F
C
P
C
COMP
0.082
μ
F
0.1
μ
F
0.47
μ
F
402k
715k
574k
93.1k
100k
32.4k
12
μ
H
15
μ
H
39
μ
H
220pF
56pF
47pF
Figure 1. Single-Supply Operation
Feedback Input. Connect a resistor-divider network to set V
OUT
. FB threshold is 1.5V.
FB
7
LDO Regulator Supply Input. IN accepts inputs up to +28V. Bypass to GND with a 1μF ceramic capacitor
as close to pins 10 and 12 as possible.
IN
10
Internal 3.1V LDO Regulator Output. Bypass to GND with a 4.7μF capacitor.
VL
11
Power Ground, source of internal N-channel switch
PGND
13, 14, 15
Compensation Input. Bypass to GND with the capacitance value shown in Table 2.
COMP
6
Shutdown Input. A logic low puts the MAX618 in shutdown mode and reduces supply current to 3μA.
SHDN
must not exceed VL.
In shutdown, the output falls to V
IN
less one diode drop.
SHDN
5
PIN
Drain of internal N-channel switch. Connect the inductor between IN and LX.
LX
2, 3, 4
Ground
GND
1, 8, 9,
12, 16
FUNCTION
NAME
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX618EEE | 3.3-V ABT Scan Test Devices With 18-Bit Universal Bus Transceivers 68-CFP -55 to 125 |
| MAX619CPA | Regulated 5V Charge-Pump DC-DC Converter |
| MAX619 | 3.3-V ABT Octal Buffers/Drivers With 3-State Outputs 20-LCCC -55 to 125 |
| MAX619CSA | Regulated 5V Charge-Pump DC-DC Converter |
| MAX619EPA | Regulated 5V Charge-Pump DC-DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX618_09 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:28V, PWM, Step-Up DC-DC Converter |
| MAX618EEE | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 28V PWM Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)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(fēng)格:SMD/SMT |
| MAX618EEE/GG8 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)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(fēng)格:SMD/SMT |
| MAX618EEE/GH9 | 制造商:Maxim Integrated Products 功能描述:STEP-UP DC-DC CONVERTER - Rail/Tube |
| MAX618EEE/V+T | 制造商:Maxim Integrated Products 功能描述:28V, PWM, STEP-UP DC-DC CONVERTER - Tape and Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。