Datasheet LTC3446 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Monolithic Buck Regulator with Dual VLDO Regulators |
| Pages / Page | 20 / 3 — elecTrical characTerisTics. The. denotes the specifications which apply … |
| File Format / Size | PDF / 290 Kb |
| Document Language | English |
elecTrical characTerisTics. The. denotes the specifications which apply over the full operating
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LTC3446
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V unless otherwise specified. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VPG(THRESH) PGOOD Threshold (Note 8) ● 8 10 % RPGOOD PGOOD Output Resistance PGOOD Low, Sinking 1mA ● 87 180 Ω IPGOOD PGOOD Hi-Z Leakage Current VPGOOD = 6V ● 1 µA
Synchronous Buck Converter
IBUCKFB Feedback Current (Note 5) ● ±30 nA VBUCKFB Regulated Feedback Voltage (Note 5) ● 0.788 0.800 0.812 V ∆VBUCKFB Feedback Voltage Line Regulation VIN = 2.7V to 5.5V (Note 5) ● 0.3 0.5 mV/V IMAXP Maximum Peak Inductor Current VBUCKFB = 0V, Duty Cycle < 35% 1.2 1.55 2.0 A IMAXN NMOS Overcurrent Limit 1.8 A Feedback Voltage Load Regulation VITH = 0.5V to 1V, VMODESEL = VIN (Note 5) 0.5 mV/V (with Respect to VITH) fOSC Oscillator Frequency ● 1.8 2.25 2.7 MHz RPFET RDS(ON) of P-Channel FET ISW = 500mA 0.13 Ω RNFET RDS(ON) of N-Channel FET ISW = –500mA 0.14 Ω ILSW SW Leakage VENBUCK = 0V, VSW = 0V or 5.5V, VIN = 5.5V ±1 µA VENBUCK Buck Enable Pin Threshold ● 0.3 0.65 1 V IENBUCK Buck Enable Pin Leakage Current VENBUCK = 5.5V, All Other Pins Grounded ● 1 µA VMODESEL Mode Select Pin Threshold ● 0.3 0.65 1 V IMODESEL Mode Select Pin Leakage Current VMODESEL = 5.5V, All Other Pins Grounded ● 1 µA gm Error Amplifier Transconductance VITH = 0.6V 450 700 950 µA/V
Each VLDO: VIN = 3.6V, VLVIN = 1.5V, VLVOUT = 1.2V, Unless Otherwise Specified
VLVIN LVIN Pin Operating Voltage (Note 6) ● 0.9 5.5 V ILVIN LVIN Pin Operating Current IOUT = 10µA ● 3 20 µA LVIN Shutdown Current VENLDO = 0V 1.5 2 µA VLVFB Feedback Pin Regulation Voltage (Note 7) 1mA ≤ IOUT ≤ 300mA, 1.5V ≤ VLVIN ≤ 5.5V 0.395 0.400 0.405 V ● 0.392 0.400 0.408 V ILVFB Feedback Pin Input Current VLVFB at Regulation ● 2 ±10 nA ILVOUT(MAX) Continuous Output Current ● 300 mA Short-Circuit Output Current 760 mA VENLDOx LDO Enable Pin Threshold ● 0.3 0.65 1 V IENLDOx LDO Enable Pin Leakage Current VENLDOx = 5.5V, All Other Pins Grounded ● 1 µA Output Voltage Load Regulation ∆IOUT = 1mA to 300mA –1 mV/A (Referred to the LVFB Pin) LVFB Line Regulation (with Respect to VLVIN = 1.5V to 5.5V, VIN = 3.6V, VLVOUT = 1.2V, 7.5 µV/V the LVIN Pin) IOUT = 1mA LVFB Line Regulation (with Respect to VLVIN = 1.5V, VIN = 2.7V to 5.5V, VLVOUT = 1.2V, 0.44 mV/V the VIN Pin) IOUT = 1mA VDO LVIN – LVOUT Dropout Voltage VIN = 2.8V, VLVIN = 1.5V, VLVFB = 0.37V, 68 175 mV IOUT = 300mA (Note 9) VIN to LVOUT Headroom Required for ILVOUT = 300mA l 1.4 V Regulation (Note 3) 3446ff 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V unless otherwise specified. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VPG(THRESH) PGOOD Threshold (Note 8) ● 8 10 % RPGOOD PGOOD Output Resistance PGOOD Low, Sinking 1mA ● 87 180 Ω IPGOOD PGOOD Hi-Z Leakage Current VPGOOD = 6V ● 1 µA
Synchronous Buck Converter
IBUCKFB Feedback Current (Note 5) ● ±30 nA VBUCKFB Regulated Feedback Voltage (Note 5) ● 0.788 0.800 0.812 V ∆VBUCKFB Feedback Voltage Line Regulation VIN = 2.7V to 5.5V (Note 5) ● 0.3 0.5 mV/V IMAXP Maximum Peak Inductor Current VBUCKFB = 0V, Duty Cycle < 35% 1.2 1.55 2.0 A IMAXN NMOS Overcurrent Limit 1.8 A Feedback Voltage Load Regulation VITH = 0.5V to 1V, VMODESEL = VIN (Note 5) 0.5 mV/V (with Respect to VITH) fOSC Oscillator Frequency ● 1.8 2.25 2.7 MHz RPFET RDS(ON) of P-Channel FET ISW = 500mA 0.13 Ω RNFET RDS(ON) of N-Channel FET ISW = –500mA 0.14 Ω ILSW SW Leakage VENBUCK = 0V, VSW = 0V or 5.5V, VIN = 5.5V ±1 µA VENBUCK Buck Enable Pin Threshold ● 0.3 0.65 1 V IENBUCK Buck Enable Pin Leakage Current VENBUCK = 5.5V, All Other Pins Grounded ● 1 µA VMODESEL Mode Select Pin Threshold ● 0.3 0.65 1 V IMODESEL Mode Select Pin Leakage Current VMODESEL = 5.5V, All Other Pins Grounded ● 1 µA gm Error Amplifier Transconductance VITH = 0.6V 450 700 950 µA/V
Each VLDO: VIN = 3.6V, VLVIN = 1.5V, VLVOUT = 1.2V, Unless Otherwise Specified
VLVIN LVIN Pin Operating Voltage (Note 6) ● 0.9 5.5 V ILVIN LVIN Pin Operating Current IOUT = 10µA ● 3 20 µA LVIN Shutdown Current VENLDO = 0V 1.5 2 µA VLVFB Feedback Pin Regulation Voltage (Note 7) 1mA ≤ IOUT ≤ 300mA, 1.5V ≤ VLVIN ≤ 5.5V 0.395 0.400 0.405 V ● 0.392 0.400 0.408 V ILVFB Feedback Pin Input Current VLVFB at Regulation ● 2 ±10 nA ILVOUT(MAX) Continuous Output Current ● 300 mA Short-Circuit Output Current 760 mA VENLDOx LDO Enable Pin Threshold ● 0.3 0.65 1 V IENLDOx LDO Enable Pin Leakage Current VENLDOx = 5.5V, All Other Pins Grounded ● 1 µA Output Voltage Load Regulation ∆IOUT = 1mA to 300mA –1 mV/A (Referred to the LVFB Pin) LVFB Line Regulation (with Respect to VLVIN = 1.5V to 5.5V, VIN = 3.6V, VLVOUT = 1.2V, 7.5 µV/V the LVIN Pin) IOUT = 1mA LVFB Line Regulation (with Respect to VLVIN = 1.5V, VIN = 2.7V to 5.5V, VLVOUT = 1.2V, 0.44 mV/V the VIN Pin) IOUT = 1mA VDO LVIN – LVOUT Dropout Voltage VIN = 2.8V, VLVIN = 1.5V, VLVFB = 0.37V, 68 175 mV IOUT = 300mA (Note 9) VIN to LVOUT Headroom Required for ILVOUT = 300mA l 1.4 V Regulation (Note 3) 3446ff 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
