Datasheet LT3694, LT3694-1 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 36V, 2.6A Monolithic Buck Regulator With Dual LDO |
| Pages / Page | 28 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| File Format / Size | PDF / 347 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
Model Line for this Datasheet
Text Version of Document
LT3694/LT3694-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, VBIAS = 3V, unless otherwise noted. (Notes 2, 9) PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Internal Undervoltage Lockout l 3.5 3.8 4 V Overvoltage Shutdown Threshold l 36 38 40 V Input Quiescent Current Not Switching 1 2 mA Bias Quiescent Current Not Switching 2 3.5 mA Shutdown Current VEN/UVLO = 0.1V 0.1 2 µA EN/UVLO Threshold, Bias On 350 500 mV EN/UVLO Threshold, Switching On l 1.16 1.2 1.23 V Reference Voltage Line Regulation 5V < VIN < 36V 0.01 %/V Switching Frequency RT = 40.2k l 0.9 1.0 1.1 MHz SYNC Input Frequency Range LT3694 Only l 0.25 2.5 MHz VIH, SYNC LT3694 Only l 1.5 V VIL, SYNC LT3694 Only l 0.35 V VOH, CLKOUT ICLKOUT = –50µA, LT3694-1 Only l 1.6 2.6 V VOL, CLKOUT ICLKOUT = 50µA, LT3694-1 Only l 0.3 V PGOOD Output Voltage Low IPGOOD = 250µA 0.2 0.4 V PGOOD Leakage VPGOOD = 2V 10 1000 nA PGOOD Threshold (Relative to VFB) (Note 8) 86 90 94 %
Switching Regulator
Feedback Pin Voltage l 735 750 765 mV Feedback Pin Bias Current l –50 –500 nA Error Amplifier Transconductance 350 µS Error Amplifier Voltage Gain 600 V/V TRK/SS Pull-Up Current –2 –3 –4 µA TRK/SS Threshold to Start Switching 35 50 70 mV VC1 Source Current VC = 0.6V –20 µA VC1 Sink Current VC = 0.6V 28 µA VC1 Clamp Voltage 2 V VC1 Switching Threshold 0.75 V VC1 to Switch Current Gain 3.6 A/V Switch Leakage Current VIN = 36V 0.01 10 µA Minimum Boost Voltage Above Switch (Note 4) 1.8 2.5 V Switch Current Limit (Note 3) (Note 3) 10% Duty Cycle l 3.5 4.9 6 A Switch VCESAT ISW1 = 3A 600 mV BST Operating Current ISW1 = 3A 60 mA VF, BST Diode IBST = 100mA 0.8 V IL BST Diode VBST – VBIAS = 36V 1 µA DA Current Limit l 2.6 3.6 4.5 A Minimum Switch Off-Time l 140 ns 36941fb 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 Typical Applications Package Description 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 = 12V, VBIAS = 3V, unless otherwise noted. (Notes 2, 9) PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Internal Undervoltage Lockout l 3.5 3.8 4 V Overvoltage Shutdown Threshold l 36 38 40 V Input Quiescent Current Not Switching 1 2 mA Bias Quiescent Current Not Switching 2 3.5 mA Shutdown Current VEN/UVLO = 0.1V 0.1 2 µA EN/UVLO Threshold, Bias On 350 500 mV EN/UVLO Threshold, Switching On l 1.16 1.2 1.23 V Reference Voltage Line Regulation 5V < VIN < 36V 0.01 %/V Switching Frequency RT = 40.2k l 0.9 1.0 1.1 MHz SYNC Input Frequency Range LT3694 Only l 0.25 2.5 MHz VIH, SYNC LT3694 Only l 1.5 V VIL, SYNC LT3694 Only l 0.35 V VOH, CLKOUT ICLKOUT = –50µA, LT3694-1 Only l 1.6 2.6 V VOL, CLKOUT ICLKOUT = 50µA, LT3694-1 Only l 0.3 V PGOOD Output Voltage Low IPGOOD = 250µA 0.2 0.4 V PGOOD Leakage VPGOOD = 2V 10 1000 nA PGOOD Threshold (Relative to VFB) (Note 8) 86 90 94 %
Switching Regulator
Feedback Pin Voltage l 735 750 765 mV Feedback Pin Bias Current l –50 –500 nA Error Amplifier Transconductance 350 µS Error Amplifier Voltage Gain 600 V/V TRK/SS Pull-Up Current –2 –3 –4 µA TRK/SS Threshold to Start Switching 35 50 70 mV VC1 Source Current VC = 0.6V –20 µA VC1 Sink Current VC = 0.6V 28 µA VC1 Clamp Voltage 2 V VC1 Switching Threshold 0.75 V VC1 to Switch Current Gain 3.6 A/V Switch Leakage Current VIN = 36V 0.01 10 µA Minimum Boost Voltage Above Switch (Note 4) 1.8 2.5 V Switch Current Limit (Note 3) (Note 3) 10% Duty Cycle l 3.5 4.9 6 A Switch VCESAT ISW1 = 3A 600 mV BST Operating Current ISW1 = 3A 60 mA VF, BST Diode IBST = 100mA 0.8 V IL BST Diode VBST – VBIAS = 36V 1 µA DA Current Limit l 2.6 3.6 4.5 A Minimum Switch Off-Time l 140 ns 36941fb 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 Typical Applications Package Description Typical Application Related Parts
