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MAX1992 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX1992 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 36 page Quick-PWM Step-Down Controllers with Inductor Saturation Protection and Dynamic Output Voltages ______________________________________________________________________________________ 11 MAX1993 DYNAMIC OUTPUT VOLTAGE TRANSITION (CREFIN = 1nF) MAX1992 toc25 100 µs/div B A C 1.5V 1.5V 2.5A -2.5A 5V 5V 0 0 D E 1.0V A. VGATE = 0 TO 5V; 5V/div B. OUTPUT = 1.5V TO 1.0V; 0.5V/div C. VREFIN: 0.5V/div D. PGOOD: 5V/div E. INDUCTOR CURRENT: 2.5A/div 100mA LOAD, SKIP = GND, CIRCUIT OF FIGURE 9 MAX1993 DYNAMIC OUTPUT VOLTAGE TRANSITION (CREFIN = 100pF) MAX1992 toc26 40 µs/div B A C 1.5V 1.5V 5A -5A 5V 5V 0 0 D E 1.0V A. VGATE = 0 TO 5V; 5V/div B. OUTPUT = 1.5V TO 1.0V; 0.5V/div C. VREFIN: 0.5V/div D. PGOOD: 5V/div E. INDUCTOR CURRENT: 2.5A/div 100mA LOAD, SKIP = GND, CIRCUIT OF FIGURE 9 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.) Pin Description PIN MAX1992 MAX1993 NAME FUNCTION 11 TON On-Time Selection Control Input. This four-level logic input sets the K-factor value used to determine the DH on-time (see the On-Time One-Shot section). Connect to analog ground (AGND or GND), REF, VCC, or leave TON unconnected to select the following nominal switching frequencies: VCC = 200kHz Open = 300kHz REF = 450kHz AGND = 600kHz 2, 7, 8 — N.C. No Connection. Not internally connected. — 2 FBLANK Fault Blanking Control Input. This four-level logic input enables or disables fault blanking, and sets the minimum forced-PWM operation time (tFBLANK). When fault blanking is enabled, PGOOD, OVP protection, and UVP protection are blanked for the selected time period after a transition is detected on GATE. Additionally, the controller enters forced-PWM mode for the duration of tFBLANK anytime GATE changes states. Connect FBLANK as follows: VCC = 140µs (min) tFBLANK, fault blanking enabled Open = 90µs (min) tFBLANK, fault blanking enabled REF = 40µs (min) tFBLANK, fault blanking enabled AGND = 90µs (min) tFBLANK, fault blanking disabled |
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