參數(shù)資料
型號： MAX5025
廠商： Maxim Integrated Products, Inc.
元件分類： DC/DC變換器
英文描述： 500kHz, 36V Output, SOT23, PWM Step-Up DC-DC Converters
中文描述： 500kHz、36V輸出、SOT23封裝、PWM升壓型DC-DC轉(zhuǎn)換器
文件頁數(shù)： 1/13頁
文件大小： 258K
代理商： MAX5025
General Description
The MAX5025–MAX5028 constant-frequency, pulse-
width modulating (PWM), low-noise boost converters
are intended for low-voltage systems that often need a
locally generated high voltage. These devices are
capable of generating low-noise, high output voltages
required for varactor diode biasing in TV tuners, set-top
boxes, and PCI cable modems. The MAX5025–
MAX5028 operate from as low as 3V and switch at
500kHz.
The constant-frequency, current-mode PWM architec-
ture provides for low output noise that is easy to filter. A
40V lateral DMOS device is used as the internal power
switch, making the devices ideal for boost converters
up to 36V. The MAX5025/MAX5026 adjustable versions
require the use of external feedback resistors to set the
output voltage. The MAX5027/MAX5028 offer a fixed
30V output. These devices are available in a small, 6-
pin SOT23 package.
Applications
TV Tuner Power Supply
Low-Noise Varactor Diode Biasing
Set-Top Box Tuner Power Supply
PCI Cable Modem
Voice-Over-Cable
LCD Power Supply
Avalanche Photodiode Biasing
Features
o
Input Voltage Range:
3V to 11V (MAX5026/MAX5028)
4.5V to 11V (MAX5025/MAX5027)
o
Wide Output Voltage Range: V
CC
to 36V
o
Output Power: 120mW (max)
o
User-Adjustable Output Voltage with
MAX5025/MAX5026 Using External Feedback
Resistors
o
Fixed 30V Output Voltage: MAX5027/MAX5028
o
Internal 1.3
(typ), 40V Switch
o
Constant PWM Frequency Provides Easy Filtering
in Low-Noise Applications
o
500kHz (typ) Switching Frequency
o
1μA (max) Shutdown Current
o
Small, 6-Pin SOT23 Package
M
500kHz, 36V Output, SOT23, PWM Step-Up
DC-DC Converters
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com
1
GND
FB
1
6
LX
5
V
CC
PGND
MAX5025–
MAX5028
SOT23-6
TOP VIEW
2
3
4
SHDN
Pin Configuration
V
OUT
30V
C1
C2
L1
V
CC
= 4.5V TO 11V
(MAX5027)
V
CC
= 3V TO 11V
(MAX5028)
D1
V
CC
GND
FB
PGND
LX
MAX5027
MAX5028
SHDN
Typical Operating Circuit
19-2239; Rev 1; 12/01
EVALUATION KIT
AVAILABLE
Ordering Information
PA RT
TEMP.
RANGE
PIN-
PA CKA GE
TOP
MARK
MAX5025
EUT-T
MAX5026
EUT-T
MAX5027
EUT-T
MAX5028
EUT-T
-40
°
C to +85
°
C
-40
°
C to +85
°
C
-40
°
C to +85
°
C
-40
°
C to +85
°
C
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
AATJ
AATK
AATL
AATM
Selector Guide appears at end of data sheet.
相關(guān)PDF資料
PDF描述
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參數(shù)描述
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