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LTC3892-1 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC3892-1
Description  60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3892-1 Datasheet(HTML) 5 Page - Linear Technology

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


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