Datasheet LT1976, LT1976B (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | High Voltage 1.5A, 200kHz Step-Down Switching Regulator with 100µA Quiescent Current |
| Pages / Page | 28 / 3 — ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply … |
| File Format / Size | PDF / 314 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply over the full –40. C to 125
Model Line for this Datasheet
Text Version of Document
LT1976/LT1976B
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full –40
°
C to 125
°
C operating temperature range, otherwise specifications are at TJ = 25
°
C. VIN = 12V, SHDN = 12V, BOOST = 15.3V, BIAS = 5V, FB/PGFB = 1.25V, CSS/SYNC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IPK SW Current Limit LT1976 ● 1.5 2.4 3.5 A LT1976B 1.2 2.5 4 A Switch On Resistance (Note 9) ● 0.2 0.4 Ω Switching Frequency BOOST = OPEN ● 180 200 230 kHz Maximum Duty Cycle 90 92 % Minimum SYNC Amplitude 1.5 2.0 V SYNC Frequency Range 230 600 kHz SYNC Input Impedance SYNC = 0.5V 100 kΩ ICSS CSS Current Threshold (Note 10) FB = 0V 7 13 20 μA IPGFB PGFB Input Current 25 100 nA VPGFB PGFB Voltage Threshold (Note 11) ● 88 90 92 % ICT CT Source Current (Note 11) ● 2 3.6 5.5 μA CT Sink Current (Note 11) 1 2 mA VCT CT Voltage Threshold (Note 11) 1.16 1.2 1.26 V PG Leakage (Note 11) PG = 12V 0.1 1 μA PG Sink Current (Note 11) PGFB = 1V, PG = 400mV 120 200 μA
The
●
denotes the specifications which apply over the full –40
°
C to 140
°
C operating temperature range, otherwise specifications are at TJ = 25
°
C. VIN = 12V, SHDN = 12V, BOOST = 15.3V, BIAS = 5V, FB/PGFB = 1.25V, CSS/SYNC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VSHDN SHDN Threshold ● 1.2 1.3 1.4 V ISHDN SHDN Input Current SHDN = 12V ● 5 20 μA Minimum Input Voltage (Note 3) ● 2.4 3 V IVINS Supply Shutdown Current SHDN = 0V, BOOST = 0V, FB/PGFB = 0V 0.1 2 μA Supply Sleep Current (Note 4) (LT1976) BIAS = 0V, FB = 1.35V ● 170 300 μA FB = 1.35V ● 45 100 μA IVIN Supply Quiescent Current BIAS = 0V, FB = 1.15V, VC = 0.8V 3.2 4.10 mA BIAS = 5V, FB = 1.15V, VC = 0.8V 2.6 3.25 mA Minimum BIAS Voltage (Note 5) ● 2.7 3 V IBIASS BIAS Sleep Current (Note 4) ● 110 180 μA IBIAS BIAS Quiescent Current SYNC = 3.3V 700 800 μA Minimum Boost Voltage (Note 6) ISW = 1.5A 1.8 2.5 V Input Boost Current (Note 7) ISW = 1.5A 40 50 mA VREF Reference Voltage (VREF) 3.3V < VVIN < 60V ● 1.212 1.25 1.288 V IFB FB Input Bias Current 75 200 nA EA Voltage Gain (Note 8) 900 V/V EA Voltage gm dI(VC)= ±10μA 400 650 800 μMho EA Source Current FB = 1.15V 20 40 55 μA EA Sink Current FB = 1.35V 15 30 40 μA VC to SW gm 3 A/V VC High Clamp 2.1 2.2 2.4 V 1976bfg 3
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full –40
°
C to 125
°
C operating temperature range, otherwise specifications are at TJ = 25
°
C. VIN = 12V, SHDN = 12V, BOOST = 15.3V, BIAS = 5V, FB/PGFB = 1.25V, CSS/SYNC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IPK SW Current Limit LT1976 ● 1.5 2.4 3.5 A LT1976B 1.2 2.5 4 A Switch On Resistance (Note 9) ● 0.2 0.4 Ω Switching Frequency BOOST = OPEN ● 180 200 230 kHz Maximum Duty Cycle 90 92 % Minimum SYNC Amplitude 1.5 2.0 V SYNC Frequency Range 230 600 kHz SYNC Input Impedance SYNC = 0.5V 100 kΩ ICSS CSS Current Threshold (Note 10) FB = 0V 7 13 20 μA IPGFB PGFB Input Current 25 100 nA VPGFB PGFB Voltage Threshold (Note 11) ● 88 90 92 % ICT CT Source Current (Note 11) ● 2 3.6 5.5 μA CT Sink Current (Note 11) 1 2 mA VCT CT Voltage Threshold (Note 11) 1.16 1.2 1.26 V PG Leakage (Note 11) PG = 12V 0.1 1 μA PG Sink Current (Note 11) PGFB = 1V, PG = 400mV 120 200 μA
The
●
denotes the specifications which apply over the full –40
°
C to 140
°
C operating temperature range, otherwise specifications are at TJ = 25
°
C. VIN = 12V, SHDN = 12V, BOOST = 15.3V, BIAS = 5V, FB/PGFB = 1.25V, CSS/SYNC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VSHDN SHDN Threshold ● 1.2 1.3 1.4 V ISHDN SHDN Input Current SHDN = 12V ● 5 20 μA Minimum Input Voltage (Note 3) ● 2.4 3 V IVINS Supply Shutdown Current SHDN = 0V, BOOST = 0V, FB/PGFB = 0V 0.1 2 μA Supply Sleep Current (Note 4) (LT1976) BIAS = 0V, FB = 1.35V ● 170 300 μA FB = 1.35V ● 45 100 μA IVIN Supply Quiescent Current BIAS = 0V, FB = 1.15V, VC = 0.8V 3.2 4.10 mA BIAS = 5V, FB = 1.15V, VC = 0.8V 2.6 3.25 mA Minimum BIAS Voltage (Note 5) ● 2.7 3 V IBIASS BIAS Sleep Current (Note 4) ● 110 180 μA IBIAS BIAS Quiescent Current SYNC = 3.3V 700 800 μA Minimum Boost Voltage (Note 6) ISW = 1.5A 1.8 2.5 V Input Boost Current (Note 7) ISW = 1.5A 40 50 mA VREF Reference Voltage (VREF) 3.3V < VVIN < 60V ● 1.212 1.25 1.288 V IFB FB Input Bias Current 75 200 nA EA Voltage Gain (Note 8) 900 V/V EA Voltage gm dI(VC)= ±10μA 400 650 800 μMho EA Source Current FB = 1.15V 20 40 55 μA EA Sink Current FB = 1.35V 15 30 40 μA VC to SW gm 3 A/V VC High Clamp 2.1 2.2 2.4 V 1976bfg 3
