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LTC3890EUH Datasheet(PDF) 3 Page - Linear Technology

Part # LTC3890EUH
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

LTC3890EUH Datasheet(HTML) 3 Page - Linear Technology

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LTC3890
3
3890f
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VLOADREG
Output Voltage Load Regulation
(Note4)
Measured in Servo Loop,
ΔITH Voltage = 1.2V to 0.7V
l
0.01
0.1
%
(Note4)
Measured in Servo Loop,
ΔITH Voltage = 1.2V to 2V
l
–0.01
–0.1
%
gm1,2
Transconductance Amplifier gm
(Note 4) ITH1,2 = 1.2V, Sink/Source = 5μA
2
mmho
IQ
Input DC Supply Current
(Note 5)
Pulse Skip or Forced Continuous Mode
(One Channel On)
RUN1 = 5V and RUN2 = 0V or
RUN1 = 0V and RUN2 = 5V,
VFB1 = 0.83V (No Load)
1.3
mA
Pulse Skip or Forced Continuous Mode
(Both Channels On)
RUN1,2 = 5V, VFB1,2 = 0.83V (No Load)
2
mA
Sleep Mode (One Channel On)
RUN1 = 5V and RUN2 = 0V or
RUN1 = 0V and RUN2 = 5V,
VFB1 = 0.83V (No Load)
50
75
μA
Sleep Mode (Both Channels On)
RUN1,2 = 5V, VFB1,2 = 0.83V (No Load)
60
100
μA
Shutdown
RUN1,2 = 0V
14
25
μA
UVLO
Undervoltage Lockout
INTVCC Ramping Up
INTVCC Ramping Down
l
l
3.6
4.0
3.8
4.2
4.0
V
V
VOVL
Feedback Overvoltage Protection
Measured at VFB1,2, Relative to Regulated VFB1,2
710
13
%
ISENSE+
SENSE+ Pin Current
Each Channel
±1
μA
ISENSE–
SENSEPins Current
Each Channel
VSENSE– < INTVCC – 0.5V
VSENSE– > INTVCC + 0.5V
700
±1
μA
μA
DFMAX
Maximum Duty Factor
In Dropout
98
99
%
ITRACK/SS1,2
Soft-Start Charge Current
VTRACK1,2 = 0V
0.7
1.0
1.4
μA
VRUN1 On
VRUN2 On
RUN1 Pin On Threshold
RUN2 Pin On Threshold
VRUN1 Rising
VRUN2 Rising
l
l
1.15
1.20
1.21
1.25
1.27
1.30
V
V
VRUN1,2 Hyst RUN Pin Hysteresis
50
mV
VSENSE(MAX)
Maximum Current Sense Threshold
VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = 0
VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = INTVCC
VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = FLOAT
l
l
l
22
43
64
30
50
75
36
57
85
mV
mV
mV
Gate Driver
TG1,2
Pull-Up On-Resistance
Pull-Down On-Resistance
2.5
1.5
Ω
Ω
BG1,2
Pull-Up On-Resistance
Pull-Down On-Resistance
2.4
1.1
Ω
Ω
TG1,2 tr
TG1,2 tf
TG Transition Time:
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
25
16
ns
ns
BG1,2 tr
BG1,2 tf
BG Transition Time:
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
28
13
ns
ns
TG/BG t1D
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
CLOAD = 3300pF Each Driver
30
ns
BG/TG t1D
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
CLOAD = 3300pF Each Driver
30
ns
tON(MIN)
Minimum On-Time
(Note 7)
95
ns
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TJ = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted.


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