LT3464 Datasheet, PDF (1/16 Pages) Linear Technology – Micropower Boost Converter with Integrated Schottky and Output Disconnect in ThinSOT

Final Electrical Specifications
LT3464
Micropower Boost
Converter with Integrated Schottky
and Output Disconnect in ThinSOT
FEATURES
DESCRIPTIO
January 2003
s _{Tiny Solution Size}
s _{Low Quiescent Current}
• 25µA in Active Mode
• 0.5µA in Shutdown Mode
s _{Integrated Schottky Diode}
s _{Integrated PNP Output Disconnect with}
Short-Circuit Protection
s _{Internal Reference Override Pin}
s _{16V at 8mA from 3.6V Input}
s _{12V at 20mA from 5V Input}
s _{Low VCE(SAT) Switch: 190mV at 80mA}
s _{Input Range: 2.3V to 10V}
s _{High Output Voltage: Up to 34V}
s _{Low Profile (1mm) ThinSOT Package}
U
APPLICATIO S
s _{LCD Bias}
s _{Handheld Computers}
s _{Battery Backup}
s _{Digital Cameras}
s _{Cellular Phones}
The LT^®3464 is a micropower step-up DC/DC converter
with integrated Schottky diode and output disconnect
packaged in an 8-lead low profile (1mm) ThinSOT^TM. The
small package size, high level of integration, and the use
of tiny SMT components yield a solution size of less than
40mm². The LT3464 has a typical current limit of 115mA
as well as fast switching speed to allow the use of a chip
inductor and small ceramic capacitors. The internal PNP
disconnects the output load from the input during shut-
down, and also provides output short-circuit protection.
An auxiliary reference input allows the user to override the
internal 1.25V feedback reference with any lower value,
allowing full control of the output voltage during opera-
tion. This device features a low 25µA quiescent current,
which is further reduced to less than 1µA in shutdown. A
current limited fixed off-time control scheme conserves
operating current, resulting in high efficiency over a broad
range of operating current. The rugged 36V switch and
output disconnect circuitry allow outputs up to 34V to be
easily generated in a simple boost topology.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technolgy Corporation
TYPICAL APPLICATIO
V_IN
2.3V TO 10V
L1
22µH
7
6
V_IN
SW
3
OUT
1
C1
CTRL
1µF
5
LT3464 CAP
8
SHDN
2
FB
C3
0.22µF
V_OUT
16V
C2
0.33µF
3.48M
GND
294k
4
3464 TA01a
C1: TAIYO YUDEN LMK107 BJ105MA-T
C2: TAIYO YUDEN GMK212 BJ474MG-T
C3: TAIYO YUDEN GMK212 BJ224MG-T
L1: MURATA LQH32CN220K
90
80
70
60
50
40
30
0.01
Efficiency
V_IN = 8.4V
V_IN = 4.2V
0.1
1
10
LOAD CURRENT (mA)
100
3634 TA01b
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
3464i
1