Features: · 0.5% Accurate Output
· Operates from 2.35V to 5.5V Supply
· Generates Low Output Voltage Down to 0.8V
· 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
· 10% Accurate Current Sensing (MAX1962)
· Adaptive Dead Time Prevents Shoot-ThroughApplicationASIC, FPGA, DSP, and CPU Core and I/O Voltages
Cellular Base Stations
Telecom and Network Equipment
Server and Storage SystemsPinoutVCC, 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.
DescriptionThe 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 MAX1960/MAX1961/MAX1962 controllers suitable for telecom and datacom applications. The operating frequency of MAX1960/MAX1961/MAX1962 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.
MAX1961 Data Sheet
