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MAX5025 Datasheet(PDF) 1 Page - Maxim Integrated Products

Part # MAX5025
Description  500kHz, 36V Output, SOT23, PWM Step-Up DC-DC Converters
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX5025 Datasheet(HTML) 1 Page - Maxim Integrated Products

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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: VCC 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 1.3Ω (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
500kHz, 36V Output, SOT23, PWM Step-Up
DC-DC Converters
________________________________________________________________ Maxim Integrated Products
1
GND
FB
16
LX
5VCC
PGND
MAX5025–
MAX5028
SOT23-6
TOP VIEW
2
34
SHDN
Pin Configuration
VOUT
30V
C1
C2
L1
VCC = 4.5V TO 11V
(MAX5027)
VCC = 3V TO 11V
(MAX5028)
D1
VCC
GND
FB
PGND
LX
MAX5027
MAX5028
SHDN
Typical Operating Circuit
19-2239; Rev 1; 12/01
EVALUATION
KIT
AVAILABLE
Ordering Information
PART
TEMP.
RANGE
PIN-
PACKAGE
TOP
MARK
MAX5025EUT-T
-40°C to +85°C
6 SOT23-6
AATJ
MAX5026EUT-T
-40°C to +85°C
6 SOT23-6
AATK
MAX5027EUT-T
-40°C to +85°C
6 SOT23-6
AATL
MAX5028EUT-T
-40°C to +85°C
6 SOT23-6
AATM
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
Selector Guide appears at end of data sheet.


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