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MAX1962 Dataheets PDF



Part Number MAX1962
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description 1MHz PWM Step-Down Controllers
Datasheet MAX1962 DatasheetMAX1962 Datasheet (PDF)

19-2740; Rev 0; 1/03 KIT ATION EVALU E L B A IL AVA www.DataSheet4U.com 2.35V to 5.5V, 0.5% Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining General Description The MAX1960/MAX1961/MAX1962 high-current, highefficiency voltage-mode step-down DC-DC controllers operate from a 2.35V to 5.5V input and generate output voltages down to 0.8V at up to 20A. An on-chip charge pump generates a regulated 5V for MOSFET drive. Additionally, adaptive dead-time drivers allow a wide variety of M.

  MAX1962   MAX1962


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19-2740; Rev 0; 1/03 KIT ATION EVALU E L B A IL AVA www.DataSheet4U.com 2.35V to 5.5V, 0.5% Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining General Description The MAX1960/MAX1961/MAX1962 high-current, highefficiency voltage-mode step-down DC-DC controllers operate from a 2.35V to 5.5V input and generate output voltages down to 0.8V at up to 20A. An on-chip charge pump generates a regulated 5V for MOSFET drive. Additionally, adaptive dead-time drivers allow a wide variety of MOSFETs to be used without risking shoot-through. Fixed-frequency PWM operation and external synchronization make these controllers suitable for telecom and datacom applications. The operating frequency is programmable to either 500kHz or 1MHz, or from 450kHz to 1.2MHz with an external clock. A clock output is provided to synchronize another converter for 180° out-of-phase operation. A high closed-loop bandwidth provides excellent transient response for applications with dynamic loads. Lossless current sensing in the MAX1960 and MAX1961 is achieved by monitoring the drain-to-source voltage of the low-side external FET. The current limit is scalable to accommodate a wide variety of MOSFETs and load currents. The MAX1962 has 10% accurate sense-resistor-based current limiting. The MAX1960 and MAX1962 have an adjustable output voltage from 0.8V to 4.95V. The MAX1961 and MAX1962 have four preset output voltages (1.5V, 1.8V, 2.5V, and 3.3V) and feature 0.5% voltage accuracy over temperature, line, and load variations. The MAX1960 and MAX1961 also feature voltage-margining control inputs that shift the output voltage up or down by 4% for system testing. Features o 0.5% Accurate Output o Operates from 2.35V to 5.5V Supply o Generates Low Output Voltage Down to 0.8V o o o o o o o o On-Chip Charge Pump Provides 5V Gate Drive Ceramic or Electrolytic Capacitors 94% Efficiency External Synchronization from 450kHz to 1.2MHz 500kHz/1MHz Fixed-Frequency PWM Operation Fast Transient Response Two Converters Can Operate 180° Out-of-Phase ±4% Voltage Margining for System Test MAX1960/MAX1961/MAX1962 o 10% Accurate Current Sensing (MAX1962) o Adaptive Dead Time Prevents Shoot-Through Ordering Information PART MAX1960EEP MAX1961EEP MAX1962EEP TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 20 QSOP 20 QSOP 20 QSOP Typical Operating Circuit INPUT 2.35V TO 5.5V C+ VCC CAVDD MAX1960 VDD Applications ASIC, FPGA, DSP, and CPU Core and I/O Voltages Cellular Base Stations Telecom and Network Equipment Server and Storage Systems VOLTAGE MARGINING AND ON/OFF CTL1 BST CTL2 COMP DH OUTPUT 0.8 TO 0.87 ✕ VIN UP TO 20A REF LX DL GND PGND ILIM OPTIONAL SYNCHRONIZATION FSET/SYNC Pin Configurations and Selector Guide appear at the end of the data sheet. CLKOUT 180° OUT-OF-PHASE CLKOUT FB ________________________________________________________________ Maxim Integrated Products 1 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. www.DataSheet4U.com 2.35V to 5.5V, 0.5% Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining MAX1960/MAX1961/MAX1962 ABSOLUTE MAXIMUM RATINGS VCC, CTL_, CS, FSET/SYNC, SEL, EN, OUT to GND ..........................................................-0.3V to +6V ILIM, COMP, REF, FB, CLKOUT, C- to GND ..............................................-0.3V to VAVDD + 0.3V C+ to GND.............-0.3V to higher of VVCC + 1V or VVDD + 0.3V VDD, AVDD to GND ..............-0.3V to higher of VVCC - 0.3V or 6V DL to PGND ................................................-0.3V to VVDD + 0.3V BST to GND ............................................................-0.3V to +12V DH to LX ...................................................................-0.3V to +6V LX to BST..................................................................-6V to +0.3V PGND to GND, or VDD to AVDD ............................-0.3V to +0.3V Continuous Power Dissipation (TA = +70°C) 20-Pin QSOP (derate up to +70°C)..............................727mW 20-Pin QSOP (derate above +70°C) ........................9.1mW/°C Operating Temperature Range (Extended).........-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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 (VVCC = 3.3V, Circuits of Figures 9–12, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise n.


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