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ISL78225 Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL78225 Datasheet(HTML) 8 Page - Intersil Corporation |
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8 / 21 page  ISL78225 8 FN7909.0 December 15, 2011 VREF2 External Reference Voltage Range 0.7 1.8 V VREF2 External Reference Voltage Accuracy -40°C to +125°C, measure at FB pin, VREF2 = 1.8V -1 1 % -40°C to +125°C, measure at FB pin, VREF2 = 0.7V -1.5 1.5 ERROR AMPLIFIER Transconductance Gain 2mS Output Impedance 5MΩ Unity Gain Bandwidth CCOMP = 100pF from COMP pin to GND 11 MHz Slew Rate CCOMP = 100pF from COMP pin to GND 2.5 V/µs Output Current Capability ±300 µA Maximum Output Voltage 3.5 V Minimum Output Voltage 0.5 V PWM CORE Duty Cycle Matching IISENxP = 60µA, RSLOPE = 30.1k, fS = 250kHz, VCOMP = 2V, 4-phase, TA = +25°C -6 6 % Zero Crossing Detection (ZCD) Threshold for PWM1/PWM2 RSEN1, 2 = 750Ω 3mV Leading Edge Blanking (Audio Mode) VMODE = VCC, VPWM_TRI = VCC, VCOMP = 0.5V Ts/12 (Note 8) ns Leading Edge Blanking (Other Mode) VMODE <4V or VPWM_TRI = GND, VCOMP = 0.5V 130 ns SLOPE pin Voltage 385 515 650 mV ISENxN Bias Current VISENxN = VISENxP, from VIN - 1V to VIN 0.3 µA ISENxN, ISENxP Common Mode Voltage Range VIN > 12V VIN-5 VIN V PWMx OUTPUT PWMx Output Voltage LOW IPWMx = -500µA 0.5 V PWMx Output Voltage HIGH IPWMx = +500µA 4.5 V PWMx Tri-State Output Voltage IPWMx = ±100µA 2.3 2.5 2.7 V PWMx Pull-Down Current During Phase Detection Time (t3 on Figure 14), VPWM = 1V 50 µA PWM3, PWM4 Disable Threshold During Phase Detection Time (t3 on Figure 14) 3.5 V PHASE ADDING/DROPPING MODE Pull-up Current VMODE = 2.4V 4.2 5.1 5.6 µA VIOUT Threshold, 4-phase, Drop Phase 4 VMODE = 1.6V 1.175 1.2 1.225 V VIOUT Threshold, 4-phase, Drop Phase 3 VMODE = 1.6V 0.775 0.8 0.825 V VIOUT Threshold, 3-phase, Drop Phase 3 VMODE = 1.8V 1.175 1.2 1.225 V VIOUT Threshold Hysteresis 40 mV Phase Drop Disable Threshold at MODE pin 3.5 4V CURRENT SENSE AND OVERCURRENT PROTECTION Peak Current Limit for Individual Channel 160 µA IOUT Current Tolerance IISENxP = 60µA, 4-phase 173 187 200 µA Maximum Voltage Limit at IOUT Pin 2.0 V DMAX PIN DMAX Threshold, High 3 V DMAX Threshold, Low 2 V DMAX Floating Voltage During Phase Detection Time (t3 on Figure 14) 2.5 V Electrical Specifications Operating Conditions: VIN = 12V, TA = -40°C to +125°C, unless otherwise specified. Typical specifications are at TA = +25°C. Boldface limits apply over the operating temperature range, -40°C to +125°C. (Continued) PARAMETER TEST CONDITIONS MIN (Note 6) TYP MAX (Note 6) UNITS |
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