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MAX5026EUT/GH9

P1-P3P4-P6P7-P9P10-P12P13-P13
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
♦ Input Voltage Range:
3V to 11V (MAX5026/MAX5028)
4.5V to 11V (MAX5025/MAX5027)
♦ Wide Output Voltage Range: V
CC
to 36V
♦ Output Power: 120mW (max)
♦ User-Adjustable Output Voltage with
MAX5025/MAX5026 Using External Feedback
Resistors
♦ Fixed 30V Output Voltage: MAX5027/MAX5028
♦ Internal 1.3Ω (typ), 40V Switch
♦ Constant PWM Frequency Provides Easy Filtering
in Low-Noise Applications
♦ 500kHz (typ) Switching Frequency
♦ 1μA (max) Shutdown Current
♦ Small, 6-Pin SOT23 Package
MAX5025–MAX5028
500kHz, 36V Output, SOT23,
PWM Step-Up DC-DC Converters
________________________________________________________________
Maxim Integrated Products
1
GND
FB
16LX
5V
CC
PGND
MAX5025–
MAX5028
SOT23-6
TOP VIEW
2
34
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 2; 3/09
EVALUATION KIT
AVAILABLE
Ordering Information
PA RT
TEMP RANGE PIN- PACK AGE
MAX5025EUT-T -40°C to +85°C 6 SOT23-6
MAX5026EUT-T -40°C to +85°C 6 SOT23-6
MAX5027EUT-T -40°C to +85°C 6 SOT23-6
MAX5028EUT-T -40°C to +85°C 6 SOT23-6
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Selector Guide appears at end of data sheet.
MAX5025–MAX5028
500kHz, 36V Output, SOT23,
Step-Up DC-DC Converters
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= 5V, SHDN = V
CC
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
CC
to GND............................................................-0.3V to +12V
PGND to GND .......................................................-0.1V to +0.1V
FB to GND (MAX5025/MAX5026)...............-0.3V to (V
CC
+ 0.3V)
FB to GND (MAX5027/MAX5028)...........................-0.3V to +40V
SHDN to GND.............................................-0.3V to (V
CC
+ 0.3V)
LX to GND ..............................................................-0.3V to +45V
Peak LX Current ................................................................600mA
Operating Temperature Range ...........................-40°C to +85°C
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C)..........695.7mW
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering 10s) ..................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
SUPPLY VOLTAGE
MAX5026/MAX5028 3.0 11
Input Voltage Range V
CC
MAX5025/MAX5027 4.5 11
V
Undervoltage Lockout
V
UVLO
Rise/fall, hysteresis = 3mV
2.25 2.65 2.95
V
Supply Current I
CC
MAX5025/MAX5026, FB = 1.4V
MAX5027/MAX5028, FB = 35V
350 1000
µA
Shutdown Current I
SHDN
SHDN = GND
0.01
1µA
BOOST CONVERTER
MAX5025/MAX5027
345 500 1000
Switching Frequency f
SW
MAX5026/MAX5028, V
CC
= 3.3V
410 500
670
kHz
MAX5025/MAX5027,
I
LOAD
= 2mA, V
CC
= 4.5V to 11V,
V
OUT
= 30V
0.25
Line Regulation
MAX5026/MAX5028,
I
LOAD
= 0.5mA, V
CC
= 3V to 11V,
V
OUT
= 30V
0.25
%/V
MAX5025/MAX5027,
V
CC
= 5V, I
LOAD
= 0 to 4mA,
V
OUT
= 30V
2.0
Load Regulation
MAX5026/MAX5028,
V
CC
= 3.3V, I
LOAD
= 0 to 1mA,
V
OUT
= 30V
1.0
%
Thermal Shutdown
140
°C
Thermal Shutdown Hysteresis 2°C
MAX5025–MAX5028
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V, SHDN = V
CC
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5025, V
CC
= 4.5V to 11V 1.19 1.25 1.31
MAX5027, V
CC
= 4.5V to 11V 28.5 30.0 31.5
MAX5026, V
CC
= 3.3V to 11V 1.212 1.25 1.288
FB Set Point V
FB
MAX5028, V
CC
= 3.3V to 11V 29.0 30 31
V
MAX5025/MAX5026, FB = 1V 110 310 nA
FB Input Bias Current I
FB
MAX5027/MAX5028, FB = 30V 100 170 µA
Output Voltage
Adjustment Range
MAX5025/MAX5026 V
CC
+ 1 36 V
LX OUTPUT
MAX5026/MAX5028,
V
CC
= 3V
2.0 4.0
V
CC
= 5V 1.3 3.0
LX On-Resistance R
ON
I
LX
= 40mA
V
CC
= 11V 1.0 2.5
Ω
Switch Current Limit I
LIM
Note 2 260 mA
MAX5025/MAX5026,
V
FB
= 1.4V
LX Leakage Current V
LX
= 40V
MAX5027/MAX5028,
V
FB
= 35V
0.01 10 µA
LOGIC INPUT: SHDN
Input Low Level V
IL
0.8 V
Input High Level V
IH
2.4 V
Input Bias Current -1 1 µA
Note 1: All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Note 2: Switch current-limit accuracy is typically ±20% and is a function of the input voltage. I
LIM
= (V
IN
/5) (260mA).
500kHz, 36V Output, SOT23,
Step-Up DC-DC Converters
_______________________________________________________________________________________ 3
P1-P3P4-P6P7-P9P10-P12P13-P13

MAX5026EUT/GH9

Mfr. #:
Buy MAX5026EUT/GH9
Manufacturer:
Maxim Integrated
Description:
IC REG BOOST ADJ 260MA 6SOT
Lifecycle:
New from this manufacturer.
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