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ISL8112 Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL8112 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 27 page 8 FN6396.0 November 21, 2006 PIN NAME FUNCTION 23 LG2 SMPS2 Synchronous-Rectifier Gate-Drive Output. LG2 swings between GND and PVCC. 24 BOOT2 Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor according to the typical application circuits (Figure 17 and Figure 18). See “MOSFET Gate Drivers (UG_, LG_)” on page 19. 25 PH2 Inductor Connection for SMPS2. PH2 is the internal lower supply rail for the UG2 high-side gate driver. PH2 is the current-sense input for the SMPS2. 26 UG2 High-Side MOSFET Floating Gate-Driver Output for SMPS2. UG1 swings between PH2 and BOOT2. 27 EN2 SMPS2 Enable Input. The SMPS2 is enabled if EN2 is greater than the logic high level and disabled if EN2 is less than the logic low level. If EN2 is connected to VREF1, the SMPS2 starts after the SMPS1 reaches regulation (delay start). Drive EN2 below 0.8V to clear fault level and reset the fault latches. 28 PGOOD2 SMP2 Power-Good Open-Drain Output. PGOOD2 is low when the SMPS2 output voltage is more than 10% below the normal regulation point or during soft-start. PGOOD2 is high impedance when the output is in regulation and the soft- start circuit has terminated. PGOOD2 is low in shutdown. 29 MODE Low-Noise Mode Control. Connect MODE to GND for normal Idle-Mode (pulse-skipping) operation or to VCC for PWM mode (fixed frequency). Connect to VREF1 or leave floating for ultrasonic skip mode operation. 30 VSEN2 SMPS2 Output Voltage-Sense Input. Connect to the SMPS2 output. VSEN2 is an input to the Constant on-time-PWM on-time one-shot circuit. It also serves as the SMPS2 feedback input in fixed-voltage mode. 31 ILIM2 SMPS2 Current-Limit Adjustment. The GND-PH1 current-limit threshold is 1/10th the voltage seen at ILIM2 over a 0.2V to 2V range. There is an internal 5µA current source from VCC to ILIM2. Connect ILIM2 to VREF1 for a fixed 200mV. The logic current limit threshold is default to 100mV value if ILIM2 is higher than VCC - 1V. 32 OUT2REF Output voltage control for SMPS2. Connect OUT2REF to VCC for fixed 3.3V. Connect OUT2REF to VREF2 for fixed 1.05V. OUT2REF can be used to program SMPS2 output voltage from 0.5V to 2.50V. SMPS2 output voltage is 0V if OUT2REF<0.5V. Pin Descriptions (Continued) Typical Performance Curves Circuit of Figure 17 and Figure 18, no load on LDO, VSEN1, VSEN2, VREF2, and VREF1, VIN = 12V, EN2 = EN1 = VCC, VBYP = 5V, PVCC = 5V, VEN_LDO = 5V, TA = -40°C to +100°C, unless otherwise noted. Typical values are at TA = +25°C. FIGURE 1. VOUT2 = 1.05V EFFICIENCY vs LOAD (300kHz) FIGURE 2. VOUT1 = 1.5V EFFICIENCY vs LOAD (200kHz) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0.001 0.010 0.100 OUTPUT LOAD (A) 1.000 7 VIN SKIP MODE 7 VIN PWM MODE 7 VIN ULTRA SKIP MODE 12 VIN SKIP MODE 12 VIN PWM MODE 25 VIN SKIP MODE 25 VIN PWM MODE 25 VIN ULTRA SKIP MODE 12 VIN ULTRA SKIP MODE 10.000 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0.010 0.100 1.000 10.000 OUTPUT LOAD (A) 0.001 7 VIN SKIP MODE 7 VIN PWM MODE 7 VIN ULTRA SKIP MODE 12 VIN SKIP MODE 12 VIN PWM MODE 25 VIN SKIP MODE 25 VIN PWM MODE 25 VIN ULTRA SKIP MODE 12 VIN ULTRA SKIP MODE ISL8112 |
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