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LTC3851IMSE-1-PBF Datasheet(PDF) 3 Page - Linear Technology

Part # LTC3851IMSE-1-PBF
Description  Synchronous Step-Down Switching Regulator Controller
Download  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3851IMSE-1-PBF Datasheet(HTML) 3 Page - Linear Technology

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LTC3851-1
3
38511f
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Main Control Loops
VIN
Input Operating Voltage Range
4
38
V
VFB
Regulated Feedback Voltage
ITH = 1.2V (Note 4)
l
0.792
0.800
0.808
V
IFB
Feedback Current
(Note 4)
–10
–50
nA
VREFLNREG
Reference Voltage Line Regulation
VIN = 6V to 38V (Note 4)
0.002
0.02
%/V
VLOADREG
Output Voltage Load Regulation
(Note 4)
Measured in Servo Loop,
ΔITH = 1.2V to 0.7V
l
0.01
0.1
%
(Note 4)
Measured in Servo Loop,
ΔITH = 1.2V to 1.6V
l
–0.01
–0.1
%
gm
Transconductance Amplifier gm
ITH = 1.2V, Sink/Source = 5μA (Note 4)
2
mmho
gm GBW
Transconductance Amp Gain Bandwidth
ITH = 1.2V
3
MHz
IQ
Input DC Supply Current
Normal Mode
Shutdown
(Note 5)
VOUT = 5V
VRUN = 0V
1
20
35
mA
μA
UVLO
Undervoltage Lockout on INTVCC
VINTVCC Ramping Down
3.25
V
UVLO Hys
UVLO Hysteresis
0.4
V
VOVL
Feedback Overvoltage Lockout
Measured at VFB
l
0.86
0.88
0.90
V
ISENSE
SENSE Pins Total Current
±1
±2
μA
ITK/SS
Soft-Start Charge Current
VTK/SS = 0V
0.6
1
2
μA
VRUN
RUN Pin On Threshold
VRUN Rising
l
1.10
1.22
1.35
V
VRUNHYS
RUN Pin On Hysteresis
130
mV
VSENSE(MAX)
Maximum Current Sense Threshold
VFB = 0.7V, VSENSE = 3.3V
l
40
50
65
mV
TG RUP
TG Driver Pull-Up On-Resistance
TG High
2.6
Ω
TG RDOWN
TG Driver Pull-Down On-Resistance
TG Low
1.5
Ω
BG RUP
BG Driver Pull-Up On-Resistance
BG High
2.4
Ω
BG RDOWN
BG Driver Pull-Down On-Resistance
BG Low
1.1
Ω
TG tr
TG tf
TG Transition Time
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
25
25
ns
ns
BG tr
BG tf
BG Transition Time
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
25
25
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 t2D
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)
90
ns
INTVCC Linear Regulator
VINTVCC
Internal VCC Voltage
6V < VIN < 38V
4.8
5
5.2
V
VLDO INT
INTVCC Load Regulation
ICC = 0mA to 50mA
0.5
%
The
l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN = 5V unless otherwise noted.


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