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MAX1964 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1964 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 30 page General Description The MAX1964/MAX1965 power-supply controllers are designed to address cost-sensitive applications demanding voltage sequencing/tracking, such as cable modem consumer premise equipment (CPE), xDSL CPE, and set-top boxes. Operating off a low-cost, unregulated DC supply (such as a wall adapter output), the MAX1964 generates three positive outputs and the MAX1965 generates four positive outputs and one neg- ative output to provide an inexpensive system power supply. The MAX1964 includes a current-mode synchronous step-down controller and two positive regulator gain blocks. The MAX1965 has one additional positive gain block and one negative regulator gain block. The main synchronous step-down controller generates a high- current output that is preset to 3.3V or adjustable from 1.236V to 0.75 ✕ VIN with an external resistive-divider. The 200kHz operating frequency allows the use of low- cost aluminum-electrolytic capacitors and low-cost power magnetics. Additionally, the MAX1964/MAX1965 step-down controllers sense the voltage across the low- side MOSFET’s on-resistance to efficiently provide the current-limit signal, eliminating the need for costly cur- rent-sense resistors. The MAX1964/MAX1965 generate additional supply rails at low cost. The positive regulator gain blocks use an external PNP pass transistor to generate low voltage rails directly from the main step-down converter (such as 2.5V or 1.8V from the main 3.3V output) or higher voltages using coupled windings from the step-down converter (such as 5V, 12V, or 15V). The MAX1965’s negative gain block uses an external NPN pass transis- tor in conjunction with a coupled winding to generate -5V, -12V, or -15V. All output voltages are externally adjustable, providing maximum flexibility. During startup, the MAX1964 fea- tures voltage sequencing and the MAX1965 features voltage tracking. Both controllers provide a power- good output that monitors all of the output voltages. Applications xDSL, Cable, and ISDN Modems Set-Top Boxes Wireless Local Loop Features o 4.5V to 28V Input Voltage Range o Master DC-DC Step-Down Converter: Preset 3.3V or Adjustable (1.236V to 0.75 x VIN) Output Voltage Fixed Frequency (200kHz) PWM Controller No Current-Sense Resistor Adjustable Current Limit 95% Efficient Soft-Start o Two (MAX1964)/Four (MAX1965) Analog Gain Blocks: Positive Analog Blocks Drive Low-Cost PNP Pass Transistors to Build Positive Linear Regulators Negative Analog Block (MAX1965) Drives a Low-Cost NPN Pass Transistor to Build a Negative Linear Regulator o Power-Good Indicator o Voltage Sequencing (MAX1964) or Tracking (MAX1965) Tracking/Sequencing Triple/Quintuple Power-Supply Controllers ________________________________________________________________ Maxim Integrated Products 1 TOP VIEW 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 POK IN VL BST DH LX DL GND ILIM MAX1964 16-Pin QSOP COMP OUT FB2 FB B2 B3 FB3 IN VL BST DH LX DL GND ILIM POK COMP OUT FB2 FB B2 B3 FB3 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 12 11 9 10 FB5 B5 FB4 B4 MAX1965 20-Pin QSOP Pin Configurations 19-2084; Rev 0; 7/01 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. Typical Operating Circuit appears at end of data sheet. Ordering Information PART TEMP. RANGE PIN- PACKAGE fOSC (kHz) MAX1964TEEE -40 °C to +85°C 16 QSOP 200 MAX1965TEEP -40 °C to +85°C 20 QSOP 200 |
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