locally generated high voltage. These devices are
boxes, and PCI cable modems. The MAX5025鈥?/div>
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.
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鈩?(typ), 40V Switch
o
Constant PWM Frequency Provides Easy Filtering
in Low-Noise Applications
o
500kHz (typ) Switching Frequency
o
1碌A (max) Shutdown Current
o
Small, 6-Pin SOT23 Package
Features
MAX5025鈥揗AX5028
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
Ordering Information
PART
MAX5025EUT-T
MAX5026EUT-T
MAX5027EUT-T
MAX5028EUT-T
TEMP.
RANGE
-40掳C to +85掳C
-40掳C to +85掳C
-40掳C to +85掳C
-40掳C to +85掳C
PIN-
PACKAGE
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
TOP
MARK
AATJ
AATK
AATL
AATM
Typical Operating Circuit
Selector Guide appears at end of data sheet.
V
CC
= 4.5V TO 11V
(MAX5027)
V
CC
= 3V TO 11V
(MAX5028)
L1
D1
V
CC
LX
V
OUT
30V
Pin Configuration
TOP VIEW
PGND 1
6
LX
MAX5027
MAX5028
SHDN
FB
C1
PGND
C2
GND 2
GND
FB 3
MAX5025鈥?/div>
MAX5028
5
V
CC
4
SHDN
SOT23-6
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com