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MAX853ISA Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX853ISA Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 8 page Low-Noise, Regulated, Negative Charge-Pump Power Supplies for GaAsFET Bias 8 ______________________________________________________________________________________ ___________________Chip Topography ________________________________________________________Package Information sensitivity and interference. The clock must be a square wave between 40% and 60% duty cycle. The maximum clock fre- quency is 250kHz, and the minimum frequency is 50kHz. Layout and Grounding Good layout is important, primarily for good noise perfor- mance. 1) Mount all components as close together as possible. 2) Keep traces short to minimize parasitic inductance and capacitance. This includes connections to FB. 3) Use a ground plane. Noise and Ripple Measurement Accurately measuring the output noise and ripple is a chal- lenge. Brief differences in ground potential between the MAX850–MAX853 circuit and the oscilloscope (which result from the charge pump’s switching action) cause ground currents in the probe’s wires, inducing sharp voltage spikes. For best results, measure directly across the output capaci- tor (C4). Do not use the ground lead of the oscilloscope probe; instead, remove the probe’s tip cover and touch the ground ring on the probe directly to C4’s ground terminal. You can also use a Tektronix chassis mount test jack (part no. 131-0258) to connect your scope probe directly. This direct connection gives the most accurate noise and rip- ple measurement. FB (MAX850–852) CONT (MAX853) OUT GND IN NEGOUT C1- C1+ SHDN (MAX850/853) SHDN (MAX851) OSC (MAX852) 0.127" (3.226mm) 0.085" (2.159mm) TRANSISTOR COUNT: 164 SUBSTRATE CONNECTED TO IN L DIM A A1 B C D E e H h L α MIN 0.053 0.004 0.014 0.007 0.189 0.150 0.228 0.010 0.016 0˚ MAX 0.069 0.010 0.019 0.010 0.197 0.157 0.244 0.020 0.050 8˚ MIN 1.35 0.10 0.35 0.19 4.80 3.80 5.80 0.25 0.40 0˚ MAX 1.75 0.25 0.49 0.25 5.00 4.00 6.20 0.50 1.27 8˚ INCHES MILLIMETERS α 8-PIN PLASTIC SMALL-OUTLINE PACKAGE H E D e A A1 C h x 45˚ 0.127mm 0.004in. B 1.27 BSC 0.050 BSC 21-325A |
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