Datasheet LTC3877 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Dual Phase Step-Down Synchronous Controller with VID Output Voltage Programming and Low Value DCR Sensing |
| Pages / Page | 46 / 4 — e lecTrical characTerisTics The. denotes the specifications which apply … |
| File Format / Size | PDF / 1.1 Mb |
| Document Language | English |
e lecTrical characTerisTics The. denotes the specifications which apply over the full operating
Model Line for this Datasheet
Text Version of Document
LTC3877
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 3). VIN = 15V, VRUN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VSENSE(MAX)DC Maximum Current Sense Threshold with Low DCR Sensing (Note 10) V – SNS (s) = 0.9V, ILIM = 0V 9 10 11 mV V – SNS (s) = 0.9V, ILIM = 1/4 INTVCC 14 15 16 mV V – SNS (s) = 0.9V, ILIM = 1/2 INTVCC 19 20 21 mV V – SNS (s) = 0.9V, ILIM = 3/4 INTVCC 23.5 25 26.5 mV V – SNS (s) = 0.9V, ILIM = INTVCC 28.5 30 31.5 mV –40°C to 125°C V – SNS (s) = 0.9V, ILIM = 0V l 8.5 10 11.5 mV V – SNS (s) = 0.9V, ILIM = 1/4 INTVCC l 13.5 15 16.5 mV V – SNS (s) = 0.9V, ILIM = 1/2 INTVCC l 17.5 20 22.5 mV V – SNS (s) = 0.9V, ILIM = 3/4 INTVCC l 22 25 28 mV V – SNS (s) = 0.9V, ILIM = INTVCC l 26.5 30 33.5 mV V – SENSE(MAX)NODC Maximum Current Sense Threshold VSNS (s) = 0.9V, ILIM = 0V l 45 50 55 mV without Low DCR Sensing (Note 11) V – SNS (s) = 0.9V, ILIM = 1/4 INTVCC l 70 75 80 mV V – SNS (s) = 0.9V, ILIM = 1/2 INTVCC l 95 100 105 mV V – SNS (s) = 0.9V, ILIM = 3/4 INTVCC l 117.5 125 132.5 mV V – SNS (s) = 0.9V, ILIM = INTVCC l 142.5 150 157.5 mV IMISMATCH Channel-to-Channel Current Mismatch ILIM = Float 5 %
Differential Amplifier 1
ICL Maximum Output Current 3 5 mA VOUT(MAX) Maximum Output Voltage IDIFFOUT = 300μA INTVCC – 1.5V V GBW Gain Bandwidth Product (Note 8) 3 4.5 MHz Slew Rate Differential Amplifier Slew Rate (Note 8) 2V V/µs
VID Parameters
RTOP VID Top Resistance (Note 8) 3.33 kΩ
Digital Inputs VID0,1,2,3,4,5, VID_EN, CHL_SEL
VIH Input High Threshold Voltage 0.7 V VIL Input Low Threshold Voltage 0.3 V Rpd Pin Pull-down Resistor 100 kΩ
Gate Drivers
TG RUP1,2 TG Pull-Up RDS(ON) TG High 2.6 Ω TG RDOWN1,2 TG Pull-Down RDS(ON) TG Low 1.5 Ω BG RUP1,2 BG Pull-Up RDS(ON) BG High 2.4 Ω BG RDOWN1,2 BG Pull-Down RDS(ON) BG Low 1.1 Ω TG Transition Time (Notes 6, 8) TG1,2 tr Rise Time CLOAD = 3300pF 25 ns TG1,2 tf Fall Time CLOAD = 3300pF 25 ns BG Transition Time (Notes 6, 8) BG1,2 tr Rise Time CLOAD = 3300pF 25 ns BG1,2 tf Fall Time CLOAD = 3300pF 25 ns TG/BG t1D Top Gate Off to Bottom Gate On CLOAD = 3300pF Each Driver 30 ns Delay BG/TG t2D Bottom Gate Off to Top Gate On CLOAD = 3300pF Each Driver 30 ns Delay tON(MIN) Minimum On-Time (Note 7) 40 ns 3877f 4 For more information www.linear.com/LTC3877
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 3). VIN = 15V, VRUN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VSENSE(MAX)DC Maximum Current Sense Threshold with Low DCR Sensing (Note 10) V – SNS (s) = 0.9V, ILIM = 0V 9 10 11 mV V – SNS (s) = 0.9V, ILIM = 1/4 INTVCC 14 15 16 mV V – SNS (s) = 0.9V, ILIM = 1/2 INTVCC 19 20 21 mV V – SNS (s) = 0.9V, ILIM = 3/4 INTVCC 23.5 25 26.5 mV V – SNS (s) = 0.9V, ILIM = INTVCC 28.5 30 31.5 mV –40°C to 125°C V – SNS (s) = 0.9V, ILIM = 0V l 8.5 10 11.5 mV V – SNS (s) = 0.9V, ILIM = 1/4 INTVCC l 13.5 15 16.5 mV V – SNS (s) = 0.9V, ILIM = 1/2 INTVCC l 17.5 20 22.5 mV V – SNS (s) = 0.9V, ILIM = 3/4 INTVCC l 22 25 28 mV V – SNS (s) = 0.9V, ILIM = INTVCC l 26.5 30 33.5 mV V – SENSE(MAX)NODC Maximum Current Sense Threshold VSNS (s) = 0.9V, ILIM = 0V l 45 50 55 mV without Low DCR Sensing (Note 11) V – SNS (s) = 0.9V, ILIM = 1/4 INTVCC l 70 75 80 mV V – SNS (s) = 0.9V, ILIM = 1/2 INTVCC l 95 100 105 mV V – SNS (s) = 0.9V, ILIM = 3/4 INTVCC l 117.5 125 132.5 mV V – SNS (s) = 0.9V, ILIM = INTVCC l 142.5 150 157.5 mV IMISMATCH Channel-to-Channel Current Mismatch ILIM = Float 5 %
Differential Amplifier 1
ICL Maximum Output Current 3 5 mA VOUT(MAX) Maximum Output Voltage IDIFFOUT = 300μA INTVCC – 1.5V V GBW Gain Bandwidth Product (Note 8) 3 4.5 MHz Slew Rate Differential Amplifier Slew Rate (Note 8) 2V V/µs
VID Parameters
RTOP VID Top Resistance (Note 8) 3.33 kΩ
Digital Inputs VID0,1,2,3,4,5, VID_EN, CHL_SEL
VIH Input High Threshold Voltage 0.7 V VIL Input Low Threshold Voltage 0.3 V Rpd Pin Pull-down Resistor 100 kΩ
Gate Drivers
TG RUP1,2 TG Pull-Up RDS(ON) TG High 2.6 Ω TG RDOWN1,2 TG Pull-Down RDS(ON) TG Low 1.5 Ω BG RUP1,2 BG Pull-Up RDS(ON) BG High 2.4 Ω BG RDOWN1,2 BG Pull-Down RDS(ON) BG Low 1.1 Ω TG Transition Time (Notes 6, 8) TG1,2 tr Rise Time CLOAD = 3300pF 25 ns TG1,2 tf Fall Time CLOAD = 3300pF 25 ns BG Transition Time (Notes 6, 8) BG1,2 tr Rise Time CLOAD = 3300pF 25 ns BG1,2 tf Fall Time CLOAD = 3300pF 25 ns TG/BG t1D Top Gate Off to Bottom Gate On CLOAD = 3300pF Each Driver 30 ns Delay BG/TG t2D Bottom Gate Off to Top Gate On CLOAD = 3300pF Each Driver 30 ns Delay tON(MIN) Minimum On-Time (Note 7) 40 ns 3877f 4 For more information www.linear.com/LTC3877
