with integrated power switch, Schottky diode and output
disconnect circuitry. The parts control power delivery by
varying both the peak inductor current and switch off-
time. This control scheme results in low output voltage
ripple as well as high efficiency over a wide load range.
The quiescent current is a low 8.5μA, which is further
reduced to 0μA in shutdown. The internal disconnect
circuitry allows the output voltage to be blocked from the
input during shutdown. High value (12.4M/0.4M) resis-
tors are integrated on chip for output voltage detection,
significantly reducing input referred quiescent current. The
LT8410/ LT8410-1 also features a comparator built into the
SHDN
pin, overvoltage protection for the CAP and V
OUT
pins, built in soft-start and comes in a tiny 8-pin 2mm ×
2mm DFN package.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815, 6498466,
6611131.
n
n
n
n
n
n
n
n
n
n
n
n
Ultralow Quiescent Current
8.5μA in Active Mode
0μA in Shutdown Mode
Comparator Built into
SHDN
Pin
Low Noise Control Scheme
Adjustable FB Reference Voltage
Wide Input Range: 2.5V to 16V
Wide Output Range: Up to 40V
Integrated Power NPN Switch
25mA Current Limit (LT8410)
8mA Current Limit (LT8410-1)
Integrated Schottky Diode
Integrated Output Disconnect
High Value (12.4M/0.4M) Feedback Resistors
Integrated
Built in Soft-Start (Optional Capacitor from V
REF
to GND)
Overvoltage Protection for CAP and V
OUT
Pins
Tiny 8-Pin 2mm × 2mm DFN Package
APPLICATIONS
n
n
n
Sensor Power
RF Mems Relay Power
General Purpose Bias
TYPICAL APPLICATION
General Purpose Bias with Wide Input Voltage
V
IN
2.5V to 16V
2.2µF
SW
V
CC
CHIP
ENABLE
CAP
V
OUT
10
100µH
V
OUT
PEAK-TO-PEAK RIPPLE (mV)
0.1µF
V
OUT
= 16V
0.1µF*
604k
GND
FBP
412k
8410-1 TA01a
Output Voltage Ripple
vs Load Current
100
V
IN
= 3.6V
8
EFFICIENCY (%)
90
80
Efficiency vs Load Current
V
IN
= 12V
V
IN
= 5V
V
IN
= 3.6V
70
60
50
40
0.01
LT8410
V
REF
SHDN
6
4
0.1µF
2
*HIGHER VALUE CAPACITOR IS REQUIRED
WHEN THE V
IN
IS HIGHER THAN 5V
0
0.01
0.1
1
LOAD CURRENT (mA)
10
8410-1 TA02
0.1
1
10
LOAD CURRENT (mA)
100
8410-1 TA03
84101fc
For more information
www.linear.com/LT8410
1
LT8410/LT8410-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
SHDN
1
V
CC
2
GND 3
SW 4
9
8 FBP
7 V
REF
6 CAP
5 V
OUT
V
CC
Voltage ................................................ –0.3V to 16V
SW Voltage ................................................ –0.3V to 42V
CAP Voltage ............................................... –0.3V to 40V
V
OUT
Voltage .............................................. –0.3V to 40V
SHDN
Voltage ............................................ –0.3V to 16V
V
REF
Voltage.............................................. –0.3V to 2.5V
FBP Voltage .............................................. –0.3V to 2.5V
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range (Note 2)..–40°C to 125°C
Storage Temperature Range...................–65°C to 150°C
DC PACKAGE
8-LEAD (2mm
×
2mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 88°C/W
EXPOSED PAD (PIN #9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT8410EDC#PBF
LT8410IDC#PBF
LT8410EDC-1#PBF
LT8410IDC-1#PBF
TAPE AND REEL
LT8410EDC#TRPBF
LT8410IDC#TRPBF
(http://www.linear.com/product/LT8410#orderinfo)
PART MARKING*
LDQR
LDQR
LFCC
LFCC
PACKAGE DESCRIPTION
8-Lead (2mm × 2mm) Plastic DFN
8-Lead (2mm × 2mm) Plastic DFN
8-Lead (2mm × 2mm) Plastic DFN
8-Lead (2mm × 2mm) Plastic DFN
TEMPERATURE RANGE
– 40°C to 125°C
– 40°C to 125°C
– 40°C to 125°C
– 40°C to 125°C
LT8410EDC-1#TRPBF
LT8410IDC-1#TRPBF
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/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3V, V
SHDN
= V
CC
unless otherwise noted. (Note 2)
PARAMETER
Minimum Operating Voltage
Maximum Operating Voltage
Reference Voltage
V
REF
Current Limit
V
REF
Discharge Time
V
REF
Line Regulation
Quiescent Current
Quiescent Current in Shutdown
Quiescent Current from V
OUT
and CAP
Minimum Switch Off Time
Switch Current Limit
Not Switching
V
SHDN
= 0V
V
OUT
= 16V
After Start-Up (Note 4)
During Start-Up (Note 4)
LT8410
LT8410-1
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
TYP
2.2
MAX
2.5
16
1.255
UNITS
V
V
V
µA
µS
%/V
1.220
1.235
10
70
0.01
8.5
0
3
240
600
(Note 3)
12
1
µA
µA
µA
nS
nS
20
6
25
8
30
10
mA
mA
2
84101fc
For more information
www.linear.com/LT8410
LT8410/LT8410-1
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3V, V
SHDN
= V
CC
unless otherwise noted. (Note 2)
PARAMETER
Switch V
CESAT
Switch Leakage Current
Schottky Forward Voltage
Schottky Reverse Leakage
PMOS Disconnect Current Limit
PMOS Disconnect V
CAP
– V
OUT
V
OUT
Resistor Divider Ratio
FBP Pin Bias Current
SHDN
Minimum Input Voltage High
SHDN
Input Voltage High Hysteresis
SHDN
Hysteresis Current
SHDN
Input Voltage Low
SHDN
Pin Bias Current
V
SHDN
= 3V
V
SHDN
= 16V
0
2
V
FBP
= 0.5V, Current Flows Out of Pin
SHDN
Rising
CONDITIONS
LT8410, I
SW
= 10mA
LT8410-1, I
SW
= 4mA
V
SW
= 5V
I
DIODE
= 10mA
V
CAP
– V
SW
= 5
V
CAP
– V
SW
= 40
LT8410
LT8410-1
I
OUT
= 1mA
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
TYP
150
100
0
650
0
0
MAX
UNITS
mV
mV
1
850
0.5
1
25
5
32.2
30
1.45
0.14
0.3
1
3
µA
mV
µA
µA
mA
mA
mV
nA
V
mV
µA
V
µA
µA
14
2.5
31.6
1.20
0.08
19
4
50
31.85
1.3
1.30
60
0.1
(Note 3)
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LT8410E/LT8410E-1 are guaranteed to meet performance
specifications from 0°C to 125°C junction temperature. Specifications over
the –40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LT8410I/LT8410I-1 are guaranteed over the full –40°C to 125°C
operating junction temperature range.
Note 3:
See the Applications Information section for more information.
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According to the timing in the data sheet, the 5529 experimental board SD card is operated in SPI mode. When debugging, the variable values are observed. The SD card sends CMD0 to reset and successful...
[i=s]This post was last edited by chunyang on 2017-4-22 17:38[/i] Limited to netizens in Xi'an, who must have posted technical questions on this site, and only this one, and there is no limit on the n...
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Embedded System
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