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LTC3890 Datasheet(PDF) 3 Page - Linear Technology

Part # LTC3890
Description  Low IQ, Synchronous Step-Down Controller with 24V Output Voltage Capability
PDF  34 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3890 Datasheet(HTML) 3 Page - Linear Technology

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LTC3807
3
3807fa
For more information www.linear.com/LTC3807
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, VRUN = 5V, EXTVCC = 0V unless
otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN
Input Supply Operating Voltage Range
4
38
V
VOUT
Regulated Output Voltage Range
0.8
24
V
VFB
Regulated Feedback Voltage
(Note 4); ITH Voltage = 1.2V
–40°C to 85°C
LTC3807E, LTC3807I
LTC3807H, LTC3807MP
l
l
0.792
0.788
0.786
0.800
0.800
0.800
0.808
0.812
0.812
V
V
V
IFB
Feedback Current
(Note 4)
±5
±50
nA
Reference Voltage Line Regulation
(Note 4); VIN = 4.5V to 38V
0.002
0.02
%/V
Output Voltage Load Regulation
(Note 4)
Measured in Servo Loop;
∆ITH Voltage = 1.2V to 0.7V
l
0.01
0.1
%
(Note 4)
Measured in Servo Loop;
∆ITH Voltage = 1.2V to 2V
l
–0.01
–0.1
%
gm
Transconductance Amplifier gm
(Note 4); ITH = 1.2V; Sink/Source 5µA
2
mmho
IQ
Input DC Supply Current
(Note 5)
Pulse Skip or Forced Continuous Mode
VFB = 0.83V (No Load)
2
mA
Sleep Mode
VFB = 0.83V (No Load)
50
75
µA
Shutdown
RUN = 0V
14
25
µA
UVLO
Undervoltage Lockout
INTVCC Ramping Up
INTVCC Ramping Down
l
l
3.6
3.92
3.80
4.2
4.0
V
V
Feedback Overvoltage Protection
Measured at VFB Relative to Regulated VFB
7
10
13
%
SENSE+ Pin Current
±1
µA
SENSE– Pins Current
VSENSE– < INTVCC – 0.5V
VSENSE– > INTVCC + 0.5V
700
±2
µA
µA
Maximum Duty Factor
In Dropout
98
99
%
Soft-Start Charge Current
VTRACK = 0V
7
10
14
µA
VRUN On
RUN Pin On Threshold
VRUN Rising
l
1.15
1.21
1.27
V
VRUN Hyst
RUN Pin Hysteresis
50
mV
VSENSE(MAX)
Maximum Current Sense Threshold
VFB = 0.7V, VSENSE– = 3.3V, ILIM = 0
VFB = 0.7V, VSENSE– = 3.3V, ILIM = INTVCC
VFB = 0.7V, VSENSE– = 3.3V, ILIM = FLOAT
l
l
l
22
43
64
30
50
75
36
57
85
mV
mV
mV
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3807HFE#PBF
LTC3807HFE#TRPBF
LTC3807FE
20-Lead Plastic TSSOP
–40°C to 150°C
LTC3807MPFE#PBF
LTC3807MPFE#TRPBF
LTC3807FE
20-Lead Plastic TSSOP
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/



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