Datasheet MAX1852, MAX1853 (Maxim) - 7

SC70 Inverting Charge Pumps with Shutdown MAX1852/MAX1853 Table 1. Low-ESR Capacitor Manufacturers PRODUCTION MANUFACTURER SERIES PHONE FAX METHOD
AVX TPS series 803-946-0690 803-626-3123 Surface-Mount Matsuo 267 series 714-969-2491 714-960-6492 Tantalum Sprague 593D, 595D series 603-224-1961 603-224-1430 Surface-Mount AVX X7R 803-946-0690 803-626-3123 Ceramic Matsuo X7R 714-969-2491 714-960-6492
Table 2. Capacitor Selection to Minimize Table 3. Capacitor Selection to Minimize Output Resistance Capacitor Size FREQUENCY CAPACITOR TYPICAL FREQUENCY CAPACITOR TYPICAL PART PART (kHz) (µF) ROUT (
Ω
) (kHz) (µF) ROUT (
Ω
)
MAX1852 50 4.7 15 MAX1852 50 3.3 20 MAX1853 200 1 15 MAX1853 200 0.68 20 … SHDN +VIN 3 +VIN 4 4 5 4 D1, D2 = 1N4148 5 5 MAX1852 MAX1852 C1 2 C1 2 2 MAX1852 MAX1853 C1 MAX1853 MAX1853 D1 6 1 6 1 VOUT 6 1 VOUT = -VIN … C2 C2 3 C2 3 D2 VOUT = (2VIN) - SHDN (VFD1) - (VFD2) VOUT = -nVIN C3 C4 Figure 4. Cascading MAX1852/MAX1853s to Increase Output Voltage Figure 6. Combined Doubler and Inverter … +VIN 2 V+ GND 4 4 5 5 MAX1852 RL MAX1852 MAX1852 MAX1853 2 MAX1853 2 MAX1853 C1 1 C1 OUT 1 6 1 VOUT 6 3 3 … Figure 7. Heavy Load Connected to a Positive Supply SHDN V C2 OUT = -VIN ROUT OF SINGLE DEVICE ROUT = NUMBER OF DEVICES
Chip Information
Figure 5. Paralleling MAX1852/MAX1853s to Reduce Output TRANSISTOR COUNT: 252 Resistance
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