LT3483 Datasheet, PDF (1/12 Pages) Linear Technology – Inverting Micropower DC/DC Converter with Schottky

FEATURES
n _{Internal 40V Schottky Diode}
n _{One Resistor Feedback (Other Resistor Inside)}
n _{Internal 40V, 200mA Power Switch}
n _{Generates Regulated Negative Outputs to –38V}
n _{Low Quiescent Current:}
40μA in Active Mode
<1μA in Shutdown Mode
n _{Low VCESAT Switch: 200mV at 150mA}
n _{Wide Input Range: 2.5V to 16V}
n _{Uses Small Surface Mount Components}
n _{Output Short-Circuit Protected}
n _{Available in a 6-Lead SOT-23 and Low Profile 8-Lead}
DFN (2mm × 2mm × 0.75mm) Packages
APPLICATIONS
n _{LCD Bias}
n _{Handheld Computers}
n _{Battery Backup}
n _{Digital Cameras}
n _{OLED Bias}
LT3483
Inverting Micropower
DC/DC Converter
with Schottky
DESCRIPTION
The LT^®3483 is a micropower inverting DC/DC converter
with integrated Schottky and one resistor feedback. The
small package size, high level of integration and use of
tiny surface mount components yield a solution size as
small as 40mm². The device features a quiescent current
of only 40μA at no load, which further reduces to 0.1μA in
shutdown. A current limited, fixed off-time control scheme
conserves operating current, resulting in high efficiency
over a broad range of load current. A precisely trimmed
10μA feedback current enables one resistor feedback
and virtually eliminates feedback loading of the output.
The 40V switch enables voltage outputs up to –38V to
be generated without the use of costly transformers. The
LT3483’s low 300ns off-time permits the use of tiny low
profile inductors and capacitors to minimize footprint and
cost in space-conscious portable applications.
The LT3483 is available in the low profile (1mm) SOT-23
(ThinSOT™) and 8-lead DFN (2mm × 2mm × 0.75mm)
packages.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Patent Pending
TYPICAL APPLICATION
3.6V to –8V DC/DC Converter
V_IN
3.6V
4.7μF
10μH
0.22μF
SW
V_IN
D
LT3483
SHDN FB
GND
10Ω
5pF 806k
V_OUT
–8V
25mA
2.2μF
3483 TA01a
Efficiency and Power Loss
75
V_IN = 3.6V
1000
EFFICIENCY
70
100
65
10
POWER
LOSS
60
1
55
0.1
1
10
LOAD CURRENT (mA)
0.1
100
3483 TA01b
3483fb
1