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LTC3892_15 Datasheet, PDF (5/36 Pages) Linear Technology – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
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LTC3892/LTC3892-1
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, VRUN1,2 = 5V, VEXTVCC = 0V, VDRVSET = 0V,
VPRG1 = FLOAT unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
VRUN1,2 ON
VRUN1,2 Hyst
VSENSE(MAX)
RUN Pin On Threshold
RUN Pin Hysteresis
Maximum Current Sense Threshold
VSENSE(MATCH) Matching Between VSENSE1(MAX) and
VSENSE2(MAX)
Gate Driver
VRUN1, VRUN2 Rising
VFB1,2 = 0.7V, VSENSE1,2– = 3.3V
ILIM = FLOAT (LTC3892) or LTC3892-1
ILIM = 0V (LTC3892 Only)
ILIM = INTVCC (LTC3892 Only)
VFB1,2 = 0.7V, VSENSE1,2– = 3.3V
ILIM = FLOAT (LTC3892) or LTC3892-1
ILIM = 0V (LTC3892 Only)
ILIM = INTVCC (LTC3892 Only)
l 1.22 1.275 1.33
75
l 66
l 43
l 90
75
84
50
58
100 109
l –8
0
8
l –8
0
8
l –8
0
8
TG1,2
Pull-Up On-Resistance
VDRVSET = INTVCC
2.2
Pull-Down On-Resistance
1.0
BG1,2
Pull-Up On-Resistance
VDRVSET = INTVCC
2.2
Pull-Down On-Resistance
1.0
BDSW1,2
BOOST to DRVCC Switch On-Resistance VSW = 0V, VDRVSET = INTVCC
3.7
TG Transition Time:
(Note 6) VDRVSET = INTVCC
TG1,2 tr
Rise Time
CLOAD = 3300pF
25
TG1,2 tf
Fall Time
CLOAD = 3300pF
15
BG Transition Time:
(Note 6) VDRVSET = INTVCC
BG1,2 tr
Rise Time
CLOAD = 3300pF
25
BG1,2 tf
Fall Time
CLOAD = 3300pF
15
TG/BG t1D Top Gate Off to Bottom Gate On Delay
CLOAD = 3300pF Each Driver, VDRVSET = INTVCC
55
Synchronous Switch-On Delay Time
BG/TG t1D Bottom Gate Off to Top Gate On Delay
CLOAD = 3300pF Each Driver, VDRVSET = INTVCC
50
Top Switch-On Delay Time
tON(MIN)1,2 TG Minimum On-Time
DRVCC Linear Regulator
VDRVCC(INT) DRVCC Voltage from Internal VIN LDO
VLDOREG(INT) DRVCC Load Regulation from VIN LDO
VDRVCC(EXT) DRVCC Voltage from Internal EXTVCC LDO
VLDOREG(EXT)
VEXTVCC
DRVCC Load Regulation from Internal
EXTVCC LDO
EXTVCC LDO Switchover Voltage
VLDOHYS
VDRVCC(50kΩ)
VDRVCC(70kΩ)
VDRVCC(90kΩ)
EXTVCC Hysteresis
Programmable DRVCC
Programmable DRVCC
Programmable DRVCC
(Note 7) VDRVSET = INTVCC
VEXTVCC = 0V
7V < VIN < 60V, DRVSET = 0V
11V < VIN < 60V, DRVSET = INTVCC
ICC = 0mA to 50mA, VEXTVCC = 0V
7V < VEXTVCC < 13V, DRVSET = 0V
11V < VEXTVCC < 13V, DRVSET = INTVCC
ICC = 0mA to 50mA, VEXTVCC = 8.5V,
VDRVSET = 0V
EXTVCC Ramping Positive
DRVUV = 0V
DRVUV = INTVCC
RDRVSET = 50kΩ, VEXTVCC = 0V
RDRVSET = 70kΩ, VEXTVCC = 0V
RDRVSET = 90kΩ, VEXTVCC = 0V
80
5.8 6.0 6.2
9.6 10.0 10.4
0.9 2.0
5.8 6.0 6.2
9.6 10.0 10.4
0.7 2.0
4.5 4.7 4.9
7.4 7.7 8.0
250
5.0
6.4 7.0 7.6
9.0
UNITS
V
mV
mV
mV
mV
mV
mV
mV
Ω
Ω
Ω
Ω
Ω
ns
ns
ns
ns
ns
ns
ns
V
V
%
V
V
%
V
V
mV
V
V
V
For more information www.linear.com/LTC3892
38921f
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