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MAX5025 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX5025 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 13 page 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 o Input Voltage Range: 3V to 11V (MAX5026/MAX5028) 4.5V to 11V (MAX5025/MAX5027) o Wide Output Voltage Range: VCC 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 1.3Ω (typ), 40V Switch o Constant PWM Frequency Provides Easy Filtering in Low-Noise Applications o 500kHz (typ) Switching Frequency o 1µA (max) Shutdown Current o Small, 6-Pin SOT23 Package 500kHz, 36V Output, SOT23, PWM Step-Up DC-DC Converters ________________________________________________________________ Maxim Integrated Products 1 GND FB 16 LX 5VCC PGND MAX5025– MAX5028 SOT23-6 TOP VIEW 2 34 SHDN Pin Configuration VOUT 30V C1 C2 L1 VCC = 4.5V TO 11V (MAX5027) VCC = 3V TO 11V (MAX5028) D1 VCC GND FB PGND LX MAX5027 MAX5028 SHDN Typical Operating Circuit 19-2239; Rev 1; 12/01 EVALUATION KIT AVAILABLE Ordering Information PART TEMP. RANGE PIN- PACKAGE TOP MARK MAX5025EUT-T -40°C to +85°C 6 SOT23-6 AATJ MAX5026EUT-T -40°C to +85°C 6 SOT23-6 AATK MAX5027EUT-T -40°C to +85°C 6 SOT23-6 AATL MAX5028EUT-T -40°C to +85°C 6 SOT23-6 AATM For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com Selector Guide appears at end of data sheet. |
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