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LT3464ETS8 Datasheet

  • LT3464ETS8

  • Micropower Boost Converter with Integrated Schottky and Outp...

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Final Electrical Specifications
LT3464
Micropower Boost
Converter with Integrated Schottky
and Output Disconnect in ThinSOT
FEATURES
s
s
DESCRIPTIO
January 2003
s
s
s
s
s
s
s
s
s
Tiny Solution Size
Low Quiescent Current
鈥?25碌A(chǔ) in Active Mode
鈥?0.5碌A(chǔ) in Shutdown Mode
Integrated Schottky Diode
Integrated PNP Output Disconnect with
Short-Circuit Protection
Internal Reference Override Pin
16V at 8mA from 3.6V Input
12V at 20mA from 5V Input
Low V
CE(SAT)
Switch: 190mV at 80mA
Input Range: 2.3V to 10V
High Output Voltage: Up to 34V
Low Profile (1mm) ThinSOT Package
APPLICATIO S
s
s
s
s
s
LCD Bias
Handheld Computers
Battery Backup
Digital Cameras
Cellular Phones
The LT
廬
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
40mm
2
. 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 25碌A(chǔ) quiescent current,
which is further reduced to less than 1碌A(chǔ) 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
7
V
IN
1
L1
22碌H
90
6
SW
OUT
C1
1碌F
CTRL
LT3464
8
SHDN
FB
GND
4
3464 TA01a
3
C3
0.22碌F
C2
0.33碌F
80
V
OUT
16V
CAP
5
EFFICIENCY (%)
70
60
50
40
30
0.01
3.48M
2
294k
C1: TAIYO YUDEN LMK107 BJ105MA-T
C2: TAIYO YUDEN GMK212 BJ474MG-T
C3: TAIYO YUDEN GMK212 BJ224MG-T
L1: MURATA LQH32CN220K
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.
U
Efficiency
V
IN
= 8.4V
U
U
V
IN
= 4.2V
1
10
0.1
LOAD CURRENT (mA)
100
3634 TA01b
3464i
1

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