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MAX1993ETG Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX1993ETG Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 36 page Quick-PWM Step-Down Controllers with Inductor Saturation Protection and Dynamic Output Voltages _______________________________________________________________________________________ 9 ILIM SATURATION FAULT CURRENT vs. ILIM VOLTAGE VILIM (V) 1.6 1.2 0.8 0.4 1 2 3 4 5 6 7 0 02.0 STARTUP WAVEFORMS (HEAVY LOAD) MAX1992 toc14 400 µs/div 2A 5V 0 B A D C 0 0 5V 2V 4A 0 A. SHDN = 0 TO 5V; 5V/div B. INDUCTOR CURRENT: 2A/div C. OUTPUT VOLTAGE (VOUT): 2V/div D. PGOOD: 5V/div, 0.7 Ω LOAD STARTUP WAVEFORMS (LIGHT LOAD) MAX1992 toc15 200 µs/div 2A 5V 3V B A D C 0 0 0 0 A. SHDN = 0 TO 5V; 5V/div B. INDUCTOR CURRENT: 2A/div C. OUTPUT VOLTAGE (VOUT): 2V/div D. PGOOD: 5V/div, 100 Ω LOAD SHUTDOWN WAVEFORMS (DISCHARGE MODE DISABLED) MAX1992 toc16 20ms/div B A E C A. SHDN = 5V TO 0; 5V/div B. INDUCTOR CURRENT: 2A/div C. DL: 5V/div D. OUTPUT VOLTAGE (VOUT): 2V/div E. PGOOD: 5V/div, 100 Ω LOAD, OVP/UVP = OPEN OR G D SHUTDOWN WAVEFORMS (DISCHARGE MODE ENABLED) MAX1992 toc17 1.0ms/div B A E C A. SHDN = 5V TO 0; 5V/div B. INDUCTOR CURRENT: 2A/div C. DL: 5V/div D. OUTPUT VOLTAGE (VOUT): 2V/div E. PGOOD: 5V/div, 100 Ω LOAD, OVP/UVP = VCC OR REF D 5V 5V 0 0 5V 2.5V 0 0 LOAD TRANSIENT (FORCED-PWM OPERATION) MAX1992 toc18 20 µs/div B A C A. LOAD: IOUT = 0.2A TO 4A; 5A/div B. 2.5V OUTPUT: 100mV/div C. INDUCTOR CURRENT: 5A/div D. LX: 10V/div, SKIP = VCC D 2.5V 4A 2.4V 0 0 5A 2.6V 0 12V Typical Operating Characteristics (continued) (MAX1992 Circuit of Figure 1, MAX1993 Circuit of Figure 9, VIN = 12V, VDD = VCC = 5V, SKIP = VCC, TON = open, TA = +25°C, unless otherwise noted.) |
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