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MAX4193MJA Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4193MJA Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 14 page Note that this circuit (with or without the MAX8212) can be used to provide 5V from four alkaline cells. The initial volt- age is approximately 6V, and the output is maintained at 5V even when the battery voltage falls to less than 2V. Dual-Tracking Regulator A MAX634 inverting regulator is combined with a MAX630 in Figure 8 to provide a dual-tracking ±15V output from a 9V battery. The reference for the -15V output is derived from the positive output through R3 and R4. Both regulators are set to maximize output power at low-battery voltage by reducing the oscillator frequency, through LBR, when VBATT falls to 7.2V. CMOS Micropower Step-Up Switching Regulator ______________________________________________________________________________________ 11 MAX630 3V R3 249k Ω R4 499k Ω R1 540k Ω R2 200k Ω C1 100pF CX 47pF LBD 8 CX GND 2 LX 4 1 LBR LX 470 μH 1N4148 +5V OUT 470 μF 15V 3 5 +VS 7 VFB 6 IC Figure 5. 3V to 5V Converter with Low-Battery Frequency Shift MAX8212 MAX630 10M Ω HYST OUT 2 THRESHOLD 3 GND 5 8 2.4M Ω 390k Ω 9V BATTERY 1.3M Ω 1M Ω 1 LBR 2M Ω 560k Ω 7 6 IC VFB 47pF 100pF LBD 8 CX LX 2 3 GND 4 1M Ω +VS 5 1.0mH 470 μF 25V Figure 7. Battery Life Extension Down to 3V In MAX630 LINE-POWERED +5V INPUT 1N4001 200k Ω 100k Ω 680 Ω 1N5817 3.6V NICAD BATTERY 470 μH 1 LBR 8 LBD GND 4 CX LX 2 3 280k Ω 100k Ω 1N5817 UNINTERRUPTABLE +5V OUTPUT 470 μF 15V 5 +VS 7 VFB 6 IC POWER FAIL 47pF Figure 6. Uninterruptable +5V Supply |
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