LT8410 Datasheet, PDF (1/16 Pages) Linear Technology – Ultralow Power Boost Converter with Output Disconnect

FEATURES
n _{Ultralow Quiescent Current}
8.5μA in Active Mode
0μA in Shutdown Mode
n _{Comparator Built into SHDN pin}
n _{Low Noise Control Scheme}
n _{Adjustable FB reference voltage}
n _{Wide Input Range: 2.5V to 16V}
n _{Wide Output Range : Up to 40V}
n _{Integrated Power NPN Switch}
25mA Current Limit (LT8410)
8mA Current Limit (LT8410-1)
n _{Integrated Schottky Diode}
n _{Integrated Output Disconnect}
n _{High Value (12.4M/0.4M) Feedback Resistors}
Integrated
n _{Built in Soft-Start (Optional Capacitor from VREF to}
GND)
n _{Overvoltage Protection for CAP and VOUT pins}
n _{Tiny 8-Pin 2mm × 2mm DFN package}
APPLICATIONS
n _{Sensor Power}
n _{RF Mems Relay Power}
n _{General Purpose Bias}
LT8410/LT8410-1
Ultralow Power Boost
Converter with Output
Disconnect
DESCRIPTION
The LT^®8410/LT8410-1 are ultralow power boost converters
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)
resistors are integrated on chip for output voltage detection,
significantly reducing input referred quiescent current.
The LT8410/-1 also features a comparator built into the
SHDN pin, over voltage 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 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.
TYPICAL APPLICATION
General Purpose Bias with Wide Input Voltage
V_IN
2.5V to 16V
100μH
2.2μF
CHIP
ENABLE
SW CAP
V_CC
V_OUT
LT8410
SHDN ^VREF
GND FBP
*HIGHER VALUE CAPACITOR IS REQUIRED
WHEN THE V_IN IS HIGHER THAN 5V
0.1μF
V_OUT = 16V
0.1μF*
604K
412K
0.1μF
8410-1 TA01a
Output Voltage Ripple
vs Load Current
10
V_IN = 3.6V
8
6
4
2
0
0.01
0.1
1
LOAD CURRENT (mA)
10
8410-1 TA02
Efficiency vs Load Current
100
V_IN = 12V
90
80
V_IN = 5V
V_IN = 3.6V
70
60
50
40
0.01
0.1
1
10
LOAD CURRENT (mA)
100
8410-1 TA03
84101f
1