Datasheet LTC3862 (Linear Technology) - 3
| Manufacturer | Linear Technology |
| Description | Multi-Phase Current Mode Step-Up DC/DC Controller |
| Pages / Page | 42 / 3 — e lecTrical characTerisTics (Notes 2, 3) The. denotes the specifications … |
| Revision | C |
| File Format / Size | PDF / 1.0 Mb |
| Document Language | English |
e lecTrical characTerisTics (Notes 2, 3) The. denotes the specifications which apply over the specified
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LTC3862
e lecTrical characTerisTics (Notes 2, 3) The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, RUN = 2V and SS = open, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Input and INTVCC Linear Regulator
VIN VIN Supply Voltage Range 4 36 V IVIN VIN Supply Current Normal Mode, No Switching (Note 5) l 1.8 3.0 mA Shutdown VRUN = 0V l 30 80 µA INTVCC LDO Regulator Output Voltage 4.8 5.0 5.2 V dVINTVCC(LINE) Line Regulation 6V < VIN < 36V 0.002 0.02 %/V dVINTVCC(LOAD) Load Regulation Load = 0mA to 20mA –2 % VUVLO INTVCC UV+ Voltage Rising INTVCC 3.3 V INTVCC UV– Voltage Falling INTVCC 2.9 V 3V8 LDO Regulator Output Voltage 3.8 V
Switcher Control Loop
VFB Reference Voltage VITH = 0.8V (Note 6) E-Grade (Note 3) l 1.210 1.223 1.235 V I-Grade and H-Grade (Note 3) l 1.199 1.223 1.248 V dVFB/dVIN Feedback Voltage VIN Line Regulation VIN = 4V to 36V (Note 6) ±0.002 0.01 %/V dVFB/dVITH Feedback Voltage Load Regulation VITH = 0.5V to 1.2V (Note 6) 0.01 0.1 % gm Transconductance Amplifier Gain VITH = 0.8V (Note 6), ITH Pin Load = ±5µA 660 µMho f0dB Error Amplifier Unity-Gain Crossover (Note 7) 1.8 MHz Frequency VITH Error Amplifier Maximum Output Voltage VFB = 1V, No Load 2.7 V (Internally Clamped) Error Amplifier Minimum Output Voltage VFB = 1.5V, No Load 50 mV IITH Error Amplifier Output Source Current –30 µA Error Amplifier Output Sink Current 30 µA IFB Error Amplifier Input Bias Currents (Note 6) –50 –200 nA VITH(PSKIP) Pulse Skip Mode Operation ITH Pin Voltage Rising ITH Voltage (Note 6) 0.275 V Hysteresis 25 mV ISENSE(ON) SENSE Pin Current 0.01 2 µA VSENSE(MAX) Maximum Current Sense Input Threshold VSLOPE = Float, Low Duty Cycle 65 75 85 mV (Note 3) l 60 75 90 mV VSENSE(MATCH) CH1 to CH2 Maximum Current Sense VSLOPE = Float, Low Duty Cycle (Note 3) l –10 10 mV Threshold Matching (VSENSE1 – VSENSE2)
RUN/Soft-Start
IRUN RUN Source Current VRUN = 0V –0.5 µA VRUN = 1.5V –5 µA VRUN High Level RUN Channel Enable Threshold 1.22 V VRUNHYS RUN Threshold Hysteresis 80 mV ISS SS Pull-Up Current VSS = 0V –5 µA RSS SS Pull-Down Resistance VRUN = 0V 10 kΩ
Oscillator
fOSC Oscillator Frequency RFREQ = 45.6k 280 300 320 kHz RFREQ = 45.6k l 260 300 340 kHz Oscillator Frequency Range l 75 500 kHz VFREQ Nominal FREQ Pin Voltage RFREQ = 45.6k 1.223 V 3862fc For more information www.linear.com/LTC3862 3 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
e lecTrical characTerisTics (Notes 2, 3) The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, RUN = 2V and SS = open, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Input and INTVCC Linear Regulator
VIN VIN Supply Voltage Range 4 36 V IVIN VIN Supply Current Normal Mode, No Switching (Note 5) l 1.8 3.0 mA Shutdown VRUN = 0V l 30 80 µA INTVCC LDO Regulator Output Voltage 4.8 5.0 5.2 V dVINTVCC(LINE) Line Regulation 6V < VIN < 36V 0.002 0.02 %/V dVINTVCC(LOAD) Load Regulation Load = 0mA to 20mA –2 % VUVLO INTVCC UV+ Voltage Rising INTVCC 3.3 V INTVCC UV– Voltage Falling INTVCC 2.9 V 3V8 LDO Regulator Output Voltage 3.8 V
Switcher Control Loop
VFB Reference Voltage VITH = 0.8V (Note 6) E-Grade (Note 3) l 1.210 1.223 1.235 V I-Grade and H-Grade (Note 3) l 1.199 1.223 1.248 V dVFB/dVIN Feedback Voltage VIN Line Regulation VIN = 4V to 36V (Note 6) ±0.002 0.01 %/V dVFB/dVITH Feedback Voltage Load Regulation VITH = 0.5V to 1.2V (Note 6) 0.01 0.1 % gm Transconductance Amplifier Gain VITH = 0.8V (Note 6), ITH Pin Load = ±5µA 660 µMho f0dB Error Amplifier Unity-Gain Crossover (Note 7) 1.8 MHz Frequency VITH Error Amplifier Maximum Output Voltage VFB = 1V, No Load 2.7 V (Internally Clamped) Error Amplifier Minimum Output Voltage VFB = 1.5V, No Load 50 mV IITH Error Amplifier Output Source Current –30 µA Error Amplifier Output Sink Current 30 µA IFB Error Amplifier Input Bias Currents (Note 6) –50 –200 nA VITH(PSKIP) Pulse Skip Mode Operation ITH Pin Voltage Rising ITH Voltage (Note 6) 0.275 V Hysteresis 25 mV ISENSE(ON) SENSE Pin Current 0.01 2 µA VSENSE(MAX) Maximum Current Sense Input Threshold VSLOPE = Float, Low Duty Cycle 65 75 85 mV (Note 3) l 60 75 90 mV VSENSE(MATCH) CH1 to CH2 Maximum Current Sense VSLOPE = Float, Low Duty Cycle (Note 3) l –10 10 mV Threshold Matching (VSENSE1 – VSENSE2)
RUN/Soft-Start
IRUN RUN Source Current VRUN = 0V –0.5 µA VRUN = 1.5V –5 µA VRUN High Level RUN Channel Enable Threshold 1.22 V VRUNHYS RUN Threshold Hysteresis 80 mV ISS SS Pull-Up Current VSS = 0V –5 µA RSS SS Pull-Down Resistance VRUN = 0V 10 kΩ
Oscillator
fOSC Oscillator Frequency RFREQ = 45.6k 280 300 320 kHz RFREQ = 45.6k l 260 300 340 kHz Oscillator Frequency Range l 75 500 kHz VFREQ Nominal FREQ Pin Voltage RFREQ = 45.6k 1.223 V 3862fc For more information www.linear.com/LTC3862 3 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
