MAX5025, MAX5026, MAX5027, MAX5028 500kHz, 36V Output, SOT23, PWM Step-Up DC-DC Converters

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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 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, 6-pin SOT23 package.

Key Features

Applications/Uses

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

	Avalanche Photodiode Biasing
	LCD Power Supply
	Low-Noise Varactor Diode Biasing
	PCI Cable Modem
	Set-Top Box Tuner Power Supply
	TV Tuner Power Supply
	Voice-Over-Cable

Key Specifications: Switch-Mode DC-DC Power Supplies

Part Number

Topology

V_IN (min) (V)

V_IN (max) (V)

Number of DC-DC Outputs

Digital/VID Programmed Output

Min. Adjustable V_OUT (V)

Max. Adjustable V_OUT (V)

I_OUT (A)

Operating Current, I_CC (max) (mA)

Fixed Freq/PWM Operation

Operating Freq. (kHz)

Internal Power Switch(es)

Synchronous Rectifier

Package

Smallest Available Package (max w/pins) (mm²)

Price^**

MAX5025

Step-Up

4.5

0.04

Yes

500

Yes

SOT-23/6

$0.53 @ 1k

MAX5026

$0.60 @ 1k

MAX5027

4.5

$0.53 @ 1k

MAX5028

$0.60 @ 1k

See All Switch-Mode DC-DC Power Supplies (413)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.