(N- and P-channel), integrated power switch, Schottky
diode and output disconnect circuitry. The N-channel and
P-channel MOSFETs in each half-bridge are synchronously
controlled by a single input pin, and never turn on at the
same time in typical applications.
The boost regulator controls 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 10.5μA, which is further reduced to 0μA
in shutdown. The internal disconnect circuitry allows the
output voltage to be blocked from the input during shut-
down. High value (12.4M/0.4M) resistors are integrated
on chip for output voltage detection, significantly reducing
input referred quiescent current. The LT8415 also features a
comparator built into the
SHDN
pin, overvoltage protection
for the CAP, V
OUT
, OUT1 and OUT2 pins, built in soft start
and comes in a tiny 12-pin 3mm
×
2mm DFN package.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap
is a trademark 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
High Voltage Switches Built in (Dual half-bridge)
Ultralow Quiescent Current
10.5μA 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)
Integrated Schottky Diode
Integrated Output Disconnect
High Value (12.4M/0.4M) Feedback Resistor Integrated
Built in Soft Start (Optional Capacitor from V
REF
to GND)
Over Voltage Protection for CAP, V
OUT
, OUT1 and
OUT2 Pins
12-Pin 3mm
×
2mm DFN package
APPLICATIONS
n
n
n
n
Sensor Power
RF Mems Relay Power
Low Power Actuator Bias/Control
Liquid Lens Driver
TYPICAL APPLICATION
Drive External Capacitors to 34V/0V with the LT8415
V
IN
2.5V to 16V
2.2μF
SW
V
CC
CAP
V
OUT
0.1μF*
34V/0V
OUT1 VOLTAGE
20/DIV
IN1 VOLTAGE
2V/DIV
C
OUT1
= 1nF
C
OUT2
= 200pF
0.1μF**
8415 TA01
Response Driving External Capacitors
100μH
22nF
V
OUT
= 34V
OUT2 VOLTAGE
20/DIV
IN2 VOLTAGE
2V/DIV
LT8415
LOGIC
LEVEL
CHIP
ENABLE
IN 1
IN 2
SHDN
GND
OUT 1
OUT 2
V
REF
137K
FBP
887K
*HIGHER VALUE CAPACITOR IS REQUIRED
WHEN THE V
IN
IS HIGHER THAN 8V
**THIS CAPACITOR IS OPTIONAL
34V/0V
20μs/DIV
8415 TA02
8415f
1
LT8415
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
SHDN
1
V
CC
2
GND 3
SW 4
IN1 5
IN2 6
13
12 FBP
11 V
REF
10 CAP
9 V
OUT
8 OUT1
7 OUT2
V
CC
Voltage ................................................– 0.3V to 16V
CAP, V
OUT
Voltage ......................................– 0.3V to 40V
SW .............................................................– 0.3V to 41V
IN1,IN2 ........................................................– 0.3V to 6V
OUT1,OUT2 ................................................– 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
DDB PACKAGE
12-PIN (3mm 2mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 76°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT8415EDDB#PBF
LT8415IDDB#PBF
TAPE AND REEL
LT8415EDDB#TRPBF
LT8415IDDB#TRPBF
PART MARKING*
LFDC
LFDC
PACKAGE DESCRIPTION
12-Pin (3mm
×
2mm) Plastic DFN
12-Pin (3mm
×
2mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
ELECTRICAL CHARACTERISTICS
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
Switch V
CESAT
Switch Leakage Current
Schottky Forward Voltage
Schottky Reverse Leakage
(Note 3)
(Note 3)
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C. V
IN
= 3.0V, V
SHDN
= V
IN
unless otherwise noted. (Note 2)
CONDITIONS
MIN
TYP
2.20
l
MAX
2.50
16
1.255
UNITS
V
V
V
μA
μS
%/V
1.220
1.235
10
70
0.01
Not Switching
V
SHDN
= 0V
V
OUT
= 16V
After Start-Up (Note 4)
During Start-Up (Note 4)
l
l
10.5
0
4
240
600
15.5
1
μA
μA
μA
nS
l
20
25
150
0
650
0
0
30
1
850
0.5
1
mA
mV
μA
mV
μA
μA
8415f
I
SW
= 10mA
V
SW
= 5V
I
DIODE
= 10mA
V
CAP
– V
SW
= 5
V
CAP
– Vsw = 40
2
LT8415
ELECTRICAL CHARACTERISTICS
PARAMETER
PMOS Disconnect Current Limit
PMOS Disconnect V
CAP
- V
OUT
Internal 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
IN1,IN2 Minimum Input Voltage High
IN1,IN2 Input Voltage Low
OUT1,OUT2 Rise Time
OUT1,OUT2 Fall Time
OUT1,OUT2 Rise Delay
OUT1,OUT2 Fall Delay
Half-bridge NMOS Voltage Drop V
OUT1,OUT2
V
OUT
= 34V, C
LOAD
= 200pF (Note 5)
V
OUT
= 34V, C
LOAD
= 200pF (Note 5)
V
OUT
= 34V, C
LOAD
= 200pF (Note 5)
V
OUT
= 34V, C
LOAD
= 200pF (Note 5)
IN1,IN2 = 0V, 0.1mA Current Into OUT1,OUT2
V
SHDN =
3V
V
SHDN =
16V
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C. V
IN
= 3.0V, V
SHDN
= V
IN
unless otherwise noted. (Note 2)
CONDITIONS
I
OUT
= 1mA
l
MIN
14
31.6
1.20
0.08
TYP
19
50
31.85
1.3
1.30
60
0.1
0
2
MAX
25
32.2
30
1.45
0.14
0.3
1
3
0.3
UNITS
mA
mV
nA
V
mV
μA
V
μA
μA
V
V
μs
μs
μs
μs
mV
mV
V
FBP
= 0.5V, Current Flows Out of Pin
SHDN
Rising
(Note 3)
l
l
1.1
2.5
3
4
2
70
85
Half-bridge PMOS Voltage Drop V
OUT
– V
OUT1,OUT2
IN1,IN2 = 2V, 0.1mA Load From OUT1,OUT2
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 LT8415 is 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.
Note 3:
See applications section for more information.
Note 4:
Start-Up mode occurs when V
OUT
is less than V
FBP
*64/3.
Note 5:
See Timing Diagram. Rise times are measured from 4V to 30V and
fall times are measured from 30V to 4V. Delay times are measured from
the IN1,IN2 transition to when the OUT1,OUT2 voltage has risen to 4V or
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