MAX5027EUT+T Maxim Integrated Products, MAX5027EUT+T Datasheet

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MAX5027EUT+T

Manufacturer Part Number
MAX5027EUT+T
Description
IC DC-DC CONV PWM SOT23-6
Manufacturer
Maxim Integrated Products
Type
Step-Up (Boost)r
Datasheet

Specifications of MAX5027EUT+T

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
4.5 ~ 36 V
Current - Output
40mA
Frequency - Switching
500kHz
Voltage - Input
4.5 ~ 11 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-6
Power - Output
695.7mW
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
MAX5027EUT+T
MAX5027EUT+TTR
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.
19-2239; Rev 2; 3/09
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.
V
CC
V
CC
= 4.5V TO 11V
= 3V TO 11V
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
(MAX5027)
(MAX5028)
Typical Operating Circuit
C1
________________________________________________________________ Maxim Integrated Products
V
SHDN
General Description
PGND
CC
MAX5027
MAX5028
L1
GND
LX
FB
Applications
D1
PWM Step-Up DC-DC Converters
500kHz, 36V Output, SOT23,
C2
V
30V
OUT
♦ Input Voltage Range:
♦ Wide Output Voltage Range: V
♦ Output Power: 120mW (max)
♦ User-Adjustable Output Voltage with
♦ Fixed 30V Output Voltage: MAX5027/MAX5028
♦ Internal 1.3Ω (typ), 40V Switch
♦ Constant PWM Frequency Provides Easy Filtering
♦ 500kHz (typ) Switching Frequency
♦ 1μA (max) Shutdown Current
♦ Small, 6-Pin SOT23 Package
Selector Guide appears at end of data sheet.
MAX5025EUT-T
MAX5026EUT-T
MAX5027EUT-T
MAX5028EUT-T
3V to 11V (MAX5026/MAX5028)
4.5V to 11V (MAX5025/MAX5027)
MAX5025/MAX5026 Using External Feedback
Resistors
in Low-Noise Applications
TOP VIEW
PA RT
PGND
GND
FB
1
2
3
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
SOT23-6
MAX5025–
MAX5028
Pin Configuration
CC
6
5
4
to 36V
LX
V
SHDN
CC
PIN- PACK AGE
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
Features
1

Related parts for MAX5027EUT+T

MAX5027EUT+T Summary of contents

Page 1

... MAX5027 MAX5028 SHDN FB C1 PGND GND ________________________________________________________________ Maxim Integrated Products 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. 500kHz, 36V Output, SOT23, PWM Step-Up DC-DC Converters ♦ Input Voltage Range 11V (MAX5026/MAX5028) 4.5V to 11V (MAX5025/MAX5027) ♦ ...

Page 2

Output, SOT23, Step-Up DC-DC Converters ABSOLUTE MAXIMUM RATINGS V to GND ............................................................-0.3V to +12V CC PGND to GND .......................................................-0.1V to +0. GND (MAX5025/MAX5026)...............-0. GND (MAX5027/MAX5028)...........................-0.3V to +40V SHDN to GND.............................................-0. ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) = 5V, SHDN = -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER SYMBOL FB Set Point FB Input Bias Current Output Voltage Adjustment Range LX ...

Page 4

Output, SOT23, Step-Up DC-DC Converters ( 30V +25°C, unless otherwise noted.) CC OUT A EFFICIENCY vs. LOAD CURRENT (V = 12V) OUT MAX5026 ...

Page 5

V = 30V +25°C, unless otherwise noted.) CC OUT A EXITING SHUTDOWN OUTPUT VOLTAGE 20V/div 5V INDUCTOR CURRENT 50mA/div SHUTDOWN VOLTAGE 5V/div 2ms/div MAX5026 5V 30V OUT CIRCUIT OF ...

Page 6

Output, SOT23, Step-Up DC-DC Converters ( 30V +25°C, unless otherwise noted.) CC OUT A HEAVY-LOAD SWITCHING WAVEFORM WITHOUT RC FILTER V OUT 5mV/div AC-COUPLED LX PIN 20V/div I L 200mA/div 1μs/div MAX5026, ...

Page 7

V = 30V +25°C, unless otherwise noted.) CC OUT A SWITCH ON-RESISTANCE vs. TEMPERATURE 3 1.5 1.0 0.5 -40 - TEMPERATURE (°C) LOAD ...

Page 8

Output, SOT23, Step-Up DC-DC Converters PIN NAME MAX5025/ MAX5027/ MAX5026 MAX5028 1 1 PGND 2 2 GND 3 — FB — SHDN Detailed Description The MAX5025–MAX5028 current-mode ...

Page 9

ULVO OSCILLATOR MAIN PWM COMPARATOR CONTROL LOGIC +A REF +C 2 GND -C CURRENT- LIMIT COMPARATOR Figure 1. Functional Diagram ⎛ ⎞ OUT ⎜ ⎟ ⎝ ...

Page 10

Output, SOT23, Step-Up DC-DC Converters For a design in which 4mA, η = 0.5, and T = 2µ 87µH UPPER and L = 12µH. LOWER For a worst-case scenario in ...

Page 11

The trace between the out- put voltage-divider (MAX5025/MAX5026) and the FB pin must be kept short, as well as the trace between GND and PGND. The shielded drum ...

Page 12

Output, SOT23, Step-Up DC-DC Converters PART OUTPUT MAX5025 Adjustable MAX5026 Adjustable MAX5027 Fixed 30V MAX5028 Fixed 30V ____________________Chip Information TRANSISTOR COUNT: 365 PROCESS: BiCMOS 12 ______________________________________________________________________________________ FREQUENCY FB SET POINT TOLERANCE TOLERANCE ±5% -31% to +100% ±3% -18% ...

Page 13

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © 2009 Maxim Integrated Products ...

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