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MAX8737 Fiches technique(PDF) 1 Page - Maxim Integrated Products |
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MAX8737 Fiches technique(HTML) 1 Page - Maxim Integrated Products |
1 / 15 page General Description The MAX8737 dual high-power linear regulator con- trollers use external n-channel MOSFETs to generate two independent low-voltage supplies for notebook computers. The MAX8737 delivers low output voltages from 0.5V to 2.5V (±5mV no-load accuracy). The exter- nal components allow scalable current design with loads up to 5A with excellent load regulation (1%). The regulator operates from a low input voltage, which also reduces the power dissipation in the external n-channel MOSFET. The controller powers the external MOSFET gate driver from the standard 5V system supply. The MAX8737 includes current and thermal limits to prevent damage to the linear regulator. The MAX8737 uses an external resistive divider to fold back the cur- rent limit, reducing the overall power dissipation. The MAX8737 uses an external resistive-divider in series with the current-sense input (CS_), providing foldback current-limit protection, and effectively reducing the short-circuit power dissipation. An output undervoltage timeout is available for low-cost applications that omit the current-sense resistor. The output undervoltage (UVP) timing depends on the mag- nitude of the voltage at VOUT. The UVP detects and shuts down the LDO if the output voltage drops out of regulation. The controller uses an adjustable reference input (REFIN_) to set the nominal output voltage (VOUT_), which minimizes the cost and makes the sta- bility independent of the output voltage. Each linear regulator features an adjustable soft-start function, and generates a delayed power-good (PGOOD) signal that signals when the linear regulator is in regulation. The MAX8737 is a low-cost solution requiring few external components and is available in a small, 4mm x 4mm, 16-pin thin QFN package. Applications Notebook and Desktop Computers Point-of-Load Regulators VMCH and VCCP CPU Supplies Low-Voltage Bias Supplies Servers Features ♦ Low-Cost Dual Linear Regulators ♦ Output Voltage Accuracy ±5mV ♦ Independent 0.5V to 2.5V Reference Inputs ♦ Foldback Current-Limit Protection ♦ Output Undervoltage-Lockout Protection ♦ Thermal Limit (Internal Sensor) ♦ 1.0V to 5.5V Input Supply Voltage (External FET Drain) ♦ 5V Bias Supply Voltage ♦ Independent Power-Good Open-Drain Outputs ♦ Independent Enable Inputs ♦ Soft-Shutdown Output Discharge ♦ Low Supply Current (0.5mA) ♦ 5µA (max) Shutdown Supply Current Dual, Low-Voltage Linear Regulator Controllers with External MOSFETs ________________________________________________________________ Maxim Integrated Products 1 16 12 34 12 11 10 9 15 14 13 5 6 7 8 DRV1 GND N.C. DRV2 PGOOD2 PGOOD1 EN2 EN1 TOP VIEW MAX8737 4mm x 4mm TQFN Pin Configuration 19-3705; Rev 0; 5/05 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. EVALUATION KIT AVAILABLE Ordering Information PART TEMP RANGE PIN-PACKAGE MAX8737ETE -40°C to +85°C 16 Thin QFN-EP* 4mm x 4mm MAX8737ETE+ -40°C to +85°C 16 Thin QFN-EP* 4mm x 4mm *EP = Exposed pad. +Denotes lead-free packaging. |
Numéro de pièce similaire - MAX8737 |
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Description similaire - MAX8737 |
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