MAX5026EUT/GH9

MAX5026EUT/GH9 Datasheet

The constant-frequency, pulsewidth 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 MAX5028 operate from as low as 3V and switch at 500kHz.

Part	Datasheet
MAX5026EUT/GH9	MAX5026EUT/GH9 (pdf)

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500kHz, 36V Output, SOT23, PWM Step-Up DC-DC Converters The constant-frequency, pulsewidth 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 MAX5028 operate from as low as 3V and switch at 500kHz. The constant-frequency, current-mode PWM architecture 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, 6pin SOT23 package. 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 Input Voltage Range 3V to 11V MAX5026/MAX5028 4.5V to 11V MAX5025/MAX5027 Wide Output Voltage Range VCC to 36V Output Power 120mW max User-Adjustable Output Voltage with MAX5025/MAX5026 Using External Feedback Resistors Fixed 30V Output Voltage MAX5027/MAX5028 Internal typ , 40V Switch Constant PWM Frequency Provides Easy Filtering in Low-Noise Applications 500kHz typ Switching Frequency 1uA max Shutdown Current Small, 6-Pin SOT23 Package PA RT MAX5025EUT-T MAX5026EUT-T MAX5027EUT-T MAX5028EUT-T Ordering Information TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 Typical Operating Circuit VCC = 4.5V TO 11V MAX5027 VCC = 3V TO 11V MAX5028 MAX5027 MAX5028 SHDN PGND VOUT 30V Selector Guide appears at end of data sheet. Pin Configuration TOP VIEW PGND 1 GND 2 MAX5028 5 VCC 4 SHDN SOT23-6 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at 500kHz, 36V Output, SOT23, Step-Up DC-DC Converters ABSOLUTE MAXIMUM RATINGS VCC to GND to +12V PGND to GND to +0.1V FB to GND MAX5025/MAX5026 ...............-0.3V to VCC + 0.3V FB to GND to +40V SHDN to VCC + 0.3V LX to GND to +45V Peak LX Current Operating Temperature Range ...........................-40°C to +85°C Continuous Power Dissipation TA = +70°C 6-Pin SOT23 derate 8.7mW/°C above +70°C ..........695.7mW Junction Temperature Storage Temperature Range .............................-65°C to +165°C Lead Temperature soldering 10s 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. ELECTRICAL CHARACTERISTICS VCC = 5V, SHDN = VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. Note 1 PARAMETER SUPPLY VOLTAGE Input Voltage Range Undervoltage Lockout Supply Current Shutdown Current BOOST CONVERTER Switching Frequency Line Regulation CONDITIONS VCC VUVLO ICC ISHDN MAX5026/MAX5028 MAX5025/MAX5027 Rise/fall, hysteresis = 3mV MAX5025/MAX5026, FB = 1.4V MAX5027/MAX5028, FB = 35V SHDN = GND MAX5025/MAX5027 MAX5026/MAX5028, VCC = 3.3V MAX5025/MAX5027, ILOAD = 2mA, VCC = 4.5V to 11V, VOUT = 30V MAX5026/MAX5028, ILOAD = 0.5mA, VCC = 3V to 11V, VOUT = 30V MIN TYP MAX 350 1000 345 500 1000 410 500 Load Regulation MAX5025/MAX5027, VCC = 5V, ILOAD = 0 to 4mA, VOUT = 30V MAX5026/MAX5028, VCC = 3.3V, ILOAD = 0 to 1mA, VOUT = 30V Thermal Shutdown Thermal Shutdown Hysteresis UNITS V µA µA °C °C 500kHz, 36V Output, SOT23, Step-Up DC-DC Converters ELECTRICAL CHARACTERISTICS continued VCC = 5V, SHDN = VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. Note 1 PARAMETER FB Set Point FB Input Bias Current Output Voltage Adjustment Range LX OUTPUT LX On-Resistance

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500kHz, 36V Output, SOT23, PWM Step-Up DC-DC Converters

The constant-frequency, pulsewidth 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 MAX5028 operate from as low as 3V and switch at 500kHz.

The constant-frequency, current-mode PWM architecture 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, 6pin SOT23 package.

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

Input Voltage Range 3V to 11V MAX5026/MAX5028 4.5V to 11V MAX5025/MAX5027

Wide Output Voltage Range VCC to 36V Output Power 120mW max

User-Adjustable Output Voltage with MAX5025/MAX5026 Using External Feedback Resistors

Fixed 30V Output Voltage MAX5027/MAX5028

Internal typ , 40V Switch

Constant PWM Frequency Provides Easy Filtering in Low-Noise Applications
500kHz typ Switching Frequency
1uA max Shutdown Current

Small, 6-Pin SOT23 Package

PA RT MAX5025EUT-T MAX5026EUT-T MAX5027EUT-T MAX5028EUT-T
Ordering Information

TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C

PIN-PACKAGE 6 SOT23-6 SOT23-6 SOT23-6 SOT23-6

Typical Operating Circuit

VCC = 4.5V TO 11V MAX5027

VCC = 3V TO 11V MAX5028

MAX5027 MAX5028

SHDN

PGND

VOUT 30V

Selector Guide appears at end of data sheet.

Pin Configuration

TOP VIEW

PGND 1

GND 2 MAX5028 5 VCC
4 SHDN

SOT23-6

Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at
500kHz, 36V Output, SOT23, Step-Up DC-DC Converters

ABSOLUTE MAXIMUM RATINGS

VCC to GND to +12V PGND to GND to +0.1V FB to GND MAX5025/MAX5026 ...............-0.3V to VCC + 0.3V FB to GND to +40V SHDN to VCC + 0.3V LX to GND to +45V Peak LX Current

Operating Temperature Range ...........................-40°C to +85°C Continuous Power Dissipation TA = +70°C
6-Pin SOT23 derate 8.7mW/°C above +70°C ..........695.7mW Junction Temperature Storage Temperature Range .............................-65°C to +165°C Lead Temperature soldering 10s

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.

ELECTRICAL CHARACTERISTICS

VCC = 5V, SHDN = VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. Note 1

PARAMETER SUPPLY VOLTAGE Input Voltage Range Undervoltage Lockout Supply Current Shutdown Current BOOST CONVERTER Switching Frequency

Line Regulation

CONDITIONS

VCC VUVLO

ICC ISHDN

MAX5026/MAX5028 MAX5025/MAX5027 Rise/fall, hysteresis = 3mV MAX5025/MAX5026, FB = 1.4V MAX5027/MAX5028, FB = 35V SHDN = GND

MAX5025/MAX5027

MAX5026/MAX5028, VCC = 3.3V

MAX5025/MAX5027, ILOAD = 2mA, VCC = 4.5V to 11V, VOUT = 30V

MAX5026/MAX5028, ILOAD = 0.5mA, VCC = 3V to 11V, VOUT = 30V

MIN TYP MAX
350 1000
345 500 1000
410 500

Load Regulation

MAX5025/MAX5027,

VCC = 5V, ILOAD = 0 to 4mA,

VOUT = 30V

MAX5026/MAX5028,

VCC = 3.3V, ILOAD = 0 to 1mA,

VOUT = 30V

Thermal Shutdown

Thermal Shutdown Hysteresis

UNITS V µA µA
°C °C
500kHz, 36V Output, SOT23, Step-Up DC-DC Converters

ELECTRICAL CHARACTERISTICS continued

VCC = 5V, SHDN = VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. Note 1

PARAMETER

FB Set Point

FB Input Bias Current Output Voltage Adjustment Range LX OUTPUT

LX On-Resistance

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Datasheet ID: MAX5026EUT/GH9 647361