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MAX15021 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX15021 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 24 page General Description The MAX15021 is a dual-output, pulse-width-modulated (PWM), step-down DC-DC regulator with tracking (coin- cident and ratiometric) and sequencing options. The device operates from 2.5V to 5.5V and each output can be adjusted from 0.6V to the input supply (VAVIN). The MAX15021 delivers up to 4A (regulator 1) and 2A (reg- ulator 2) of output current. This device offers the ability to adjust the switching frequency from 500kHz to 4MHz and provides the capability of optimizing the design in terms of size and performance. The MAX15021 utilizes a voltage-mode control scheme with external compensation to provide good noise immunity and maximum flexibility in selecting inductor values and capacitor types. The dual switching regula- tors operate 180° out-of-phase, thereby reducing the RMS input ripple current and thus the size of the input bypass capacitor significantly. The MAX15021 offers the ability to track (coincident or ratiometric) or sequence during power-up and power- down operation. When sequencing, it powers up glitch- free into a prebiased output. Additional features include an internal undervoltage lockout with hysteresis and a digital soft-start/soft-stop for glitch-free power-up and power-down. Protection features include lossless cycle-by-cycle current limit, hiccup-mode output short-circuit protection, and ther- mal shutdown. The MAX15021 is available in a space-saving, 5mm x 5mm, 28-pin TQFN-EP package and is specified for operation from -40°C to +125°C temperature range. Applications RFID Reader Cards Power-over-Ethernet (PoE) IP Phones Automotive Multimedia Multivoltage Supplies Networking/Telecom Features ♦ 2.5V to 5.5V Input-Voltage Range ♦ Dual-Output Synchronous Buck Regulators ♦ Integrated Switches for 4A and 2A Output Currents ♦ 180° Out-Of-Phase Operation ♦ Output Voltage Adjustable from 0.6V to VAVIN ♦ Lossless, Cycle-by-Cycle Current Sensing ♦ External Compensation for Maximum Flexibility ♦ Digital Soft-Start and Soft-Stop for Tracking Applications ♦ Digital Soft-Start into a Prebiased Load for Sequencing Applications ♦ Sequencing or Coincident/Ratiometric Tracking ♦ Programmable Switching Frequency from 500kHz to 4MHz ♦ Thermal Shutdown and Hiccup-Mode Short- Circuit Protection ♦ 20µA Shutdown Current ♦ 100% Maximum Duty Cycle ♦ Space-Saving (5mm x 5mm) 28-Pin TQFN Package MAX15021 Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com. MAX15021 TOP VIEW 26 27 25 24 10 9 11 12 1 + 2 EN2 4 *EP *EP = EXPOSED PAD. 56 7 20 21 19 17 16 15 SGND AVIN COMP1 FB1 EN1 DVDD1 3 18 28 8 RT PGND1 FB2 23 13 N.C. COMP2 22 14 N.C. N.C. Pin Configuration Ordering Information 19-4106; Rev 1; 8/12 PART TEMP RANGE PIN-PACKAGE MAX15021ATI/V+ -40°C to +125°C 28 TQFN-EP* + Denotes a lead-free package. * EP = Exposed pad. /V denotes an automotive qualified part. |
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