Datasheet LTC3897 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | PolyPhase Synchronous Boost Controller with Input/Output Protection |
| Pages / Page | 50 / 4 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Revision | A |
| File Format / Size | PDF / 3.9 Mb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
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LTC3897
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VBIAS = 12V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
gm Error Amplifier Transconductance ITH = 1.2 V 2 mmho UVLO Undervoltage Lockout DRVCC Ramping Up DRVUV = 0V l 4.0 4.2 V DRVUV = INTVCC l 7.5 7.8 V DRVCC Ramping Down DRVUV = 0V l 3.6 3.8 4.0 V DRVUV = INTVCC l 6.4 6.7 7.0 V VRUN RUN Pin ON Threshold VRUN Rising l 1.18 1.28 1.38 V RUN Pin Hysteresis 100 mV ISS Soft-Start Charge Current VSS = GND 7 10 13 µA VSENSE1,2(MAX) Maximum Current Sense Threshold VFB = 1.15V, ILIM = INTVCC, VSENSE+ = 12V l 125 140 155 mV VFB = 1.15V, ILIM = Float, VSENSE+ = 12V l 85 95 105 mV VFB = 1.15V, ILIM = GND, VSENSE+ = 12V l 41 48 55 mV Matching Between VSENSE1(MAX) and VFB = 1.15V, ILIM = INTVCC, VSENSE+ = 12V l –12 0 12 mV VSENSE2(MAX) VFB = 1.15V, ILIM = Float, VSENSE+ = 12V l –10 0 10 mV VFB = 1.15V, ILIM = GND, VSENSE+ = 12V l –9 0 9 mV SENSE+ Pin Current VFB = 1.1V, ILIM = Float 250 350 µA SENSE– Pin Current VFB = 1.1V, ILIM = Float ±2 µA Top Gate Pull-Up Resistance DRVCC = 10V 2.5 Ω Top Gate Pull-Down Resistance DRVCC = 10V 1.5 Ω Bottom Gate Pull-Up Resistance DRVCC = 10V 2.5 Ω Bottom Gate Pull-Down Resistance DRVCC = 10V 1 Ω BDSW BOOST to DRVCC Switch On-Resistance VSW = 0V, VDRVSET = INTVCC 2.6 3.7 Ω Top Gate Off to Bottom Gate On Switch-On DTC = 0V 55 75 ns Delay Time DTC = Float 90 130 ns DTC = INTVCC 170 275 ns Bottom Gate Off to Top Gate On Switch-On DTC = 0V 55 75 ns Delay Time DTC = Float 90 130 ns DTC = INTVCC 170 275 ns Maximum BG Duty Factor 96 % tON(MIN) Minimum BG On-Time (Note 7) VDRVSET = INTVCC 90 ns
DRVCC LDO Regulator
DRVCC Voltage from Internal VBIAS LDO VEXTVCC = 0V 7V < VBIAS < 75V, DRVSET = 0V 5.8 6.0 6.2 V 11V < VBIAS < 75V, DRVSET = INTVCC 9.6 10.0 10.4 V DRVCC Load Regulation from VBIAS LDO ICC = 0mA to 50mA, VEXTVCC = 0V, 0.7 2 % VDRVSET = INTVCC DRVCC Voltage from Internal EXTVCC LDO 7V < VEXTVCC < 13V, DRVSET = 0V 5.8 6.0 6.2 V 11V < VEXTVCC < 13V, DRVSET = INTVCC 9.6 10.0 10.4 V DRVCC Load Regulation from ICC = 0mA to 50mA, VEXTVCC = 8.5V, 0.7 2 % Internal EXTVCC LDO VDRVSET = 0V Rev. A 4 For more information www.analog.com Document Outline Features Applications Typical Application Description 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 specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VBIAS = 12V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
gm Error Amplifier Transconductance ITH = 1.2 V 2 mmho UVLO Undervoltage Lockout DRVCC Ramping Up DRVUV = 0V l 4.0 4.2 V DRVUV = INTVCC l 7.5 7.8 V DRVCC Ramping Down DRVUV = 0V l 3.6 3.8 4.0 V DRVUV = INTVCC l 6.4 6.7 7.0 V VRUN RUN Pin ON Threshold VRUN Rising l 1.18 1.28 1.38 V RUN Pin Hysteresis 100 mV ISS Soft-Start Charge Current VSS = GND 7 10 13 µA VSENSE1,2(MAX) Maximum Current Sense Threshold VFB = 1.15V, ILIM = INTVCC, VSENSE+ = 12V l 125 140 155 mV VFB = 1.15V, ILIM = Float, VSENSE+ = 12V l 85 95 105 mV VFB = 1.15V, ILIM = GND, VSENSE+ = 12V l 41 48 55 mV Matching Between VSENSE1(MAX) and VFB = 1.15V, ILIM = INTVCC, VSENSE+ = 12V l –12 0 12 mV VSENSE2(MAX) VFB = 1.15V, ILIM = Float, VSENSE+ = 12V l –10 0 10 mV VFB = 1.15V, ILIM = GND, VSENSE+ = 12V l –9 0 9 mV SENSE+ Pin Current VFB = 1.1V, ILIM = Float 250 350 µA SENSE– Pin Current VFB = 1.1V, ILIM = Float ±2 µA Top Gate Pull-Up Resistance DRVCC = 10V 2.5 Ω Top Gate Pull-Down Resistance DRVCC = 10V 1.5 Ω Bottom Gate Pull-Up Resistance DRVCC = 10V 2.5 Ω Bottom Gate Pull-Down Resistance DRVCC = 10V 1 Ω BDSW BOOST to DRVCC Switch On-Resistance VSW = 0V, VDRVSET = INTVCC 2.6 3.7 Ω Top Gate Off to Bottom Gate On Switch-On DTC = 0V 55 75 ns Delay Time DTC = Float 90 130 ns DTC = INTVCC 170 275 ns Bottom Gate Off to Top Gate On Switch-On DTC = 0V 55 75 ns Delay Time DTC = Float 90 130 ns DTC = INTVCC 170 275 ns Maximum BG Duty Factor 96 % tON(MIN) Minimum BG On-Time (Note 7) VDRVSET = INTVCC 90 ns
DRVCC LDO Regulator
DRVCC Voltage from Internal VBIAS LDO VEXTVCC = 0V 7V < VBIAS < 75V, DRVSET = 0V 5.8 6.0 6.2 V 11V < VBIAS < 75V, DRVSET = INTVCC 9.6 10.0 10.4 V DRVCC Load Regulation from VBIAS LDO ICC = 0mA to 50mA, VEXTVCC = 0V, 0.7 2 % VDRVSET = INTVCC DRVCC Voltage from Internal EXTVCC LDO 7V < VEXTVCC < 13V, DRVSET = 0V 5.8 6.0 6.2 V 11V < VEXTVCC < 13V, DRVSET = INTVCC 9.6 10.0 10.4 V DRVCC Load Regulation from ICC = 0mA to 50mA, VEXTVCC = 8.5V, 0.7 2 % Internal EXTVCC LDO VDRVSET = 0V Rev. A 4 For more information www.analog.com Document Outline Features Applications Typical Application Description 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
