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MAX1970 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1970 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 21 page General Description The MAX1970/MAX1971/MAX1972 dual-output current- mode PWM buck regulators operate from 2.6V to 5.5V input and deliver a minimum of 750mA on each output. The MAX1970 and MAX1972 operate at a fixed 1.4MHz (MAX1971 operates at 700kHz) to reduce output induc- tor and capacitor size and cost. Switching the regula- tors 180° out-of-phase also reduces the input capacitor size and cost. Ceramic capacitors can be used for input and output. The output voltages are programmable from 1.2V to VIN using external feedback resistors, or can be preset to 1.8V or 3.3V for output 1 and 1.5V or 2.5V for output 2. When one output is higher than 1.2V, the second can be configured down to sub-1V levels. Output accuracy is better than ±1% over variations in load, line, and tem- perature. Internal soft-start reduces inrush current dur- ing startup. All devices feature power-on reset (POR). The MAX1971 includes a reset input (RSI), which forces POR low for 175ms after RSI goes low. The MAX1970 and MAX1972 include an open-drain power-fail output (PFO) that monitors input voltage and goes high when the input falls below 3.94V. For USB-powered xDSL modems, this output can be used to detect USB power failure. A minimum switching frequency of 1.2MHz ensures operation outside the xDSL band. Applications Features o Current-Mode, 1.4MHz Fixed-Frequency PWM Operation o 180° Out-of-Phase Operation Reduces Input Capacitor o ±1% Output Accuracy Over Load, Line, and Temperature Ranges o 750mA Guaranteed Output Current o 2.6V to 5.5V Input o Power-On Reset Delay of 16.6ms (MAX1970) or 175ms (MAX1971 and MAX1972) o Power-Fail Output (MAX1970 and MAX1972 Only) o Power-On Reset Input (MAX1971 Only) o Operation Outside xDSL Band o Ultra-Compact Design with Smallest External Components o Outputs Adjustable from 0.8V to VIN or 1.8V/3.3V and 1.5V/2.5V Preset o All-Ceramic Capacitor Application o Soft-Start Reduces Inrush Current Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step- Down Regulator with POR and RSI/PFO ________________________________________________________________ Maxim Integrated Products 1 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 LX1 PGND LX2 IN FBSEL1 FBSEL2 PF0 (MAX1970/MAX1972) RSI (MAX1971) EN POR TOP VIEW MAX1970 MAX1971 MAX1972 QSOP VCC COMP1 COMP2 FB1 FB2 REF GND Pin Configuration VCC VCC RSI EN COMP1 COMP2 FBSEL1 FBSEL2 REF POR POR OUT1 1.8V 750mA OUT2 2.5V 750mA RSI LX1 FB2 FB1 LX2 PGND IN MAX1971 EN VIN 2.6V TO 5.5V Typical Operating Circuit 19-2297; Rev 1; 2/09 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. xDSL Modems xDSL Routers Copper Gigabit SFP and GBIC Modules USB-Powered Devices Dual LDO Replacement Ordering Information PART TEMP RANGE PIN-PACKAGE MAX1970EEE -40 °C to +85°C 16 QSOP MAX1971EEE -40 °C to +85°C 16 QSOP MAX1972EEE -40 °C to +85°C 16 QSOP |
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