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LT1300 Datasheet(PDF) 1 Page - Linear Technology

Part No. LT1300
Description  Micropower High Efficiency 3.3/5V Step-Up DC/DC Converter
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1300 Datasheet(HTML) 1 Page - Linear Technology

   
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1
LT1300
s
Up to 220mA Output Current at 5V from 2V Supply
s
Supply Voltage as Low as 1.8V
s
Up to 88% Efficiency
s
Small Inductor –10
µH
s
120
µA Quiescent Current
s
Shutdown to 10
µA
s
Programmable 3.3V or 5V Output
s
ILIM Pin Programs Peak Switch Current
s
Low VCESAT Switch: 170mV at 1A Typical
s
Uses Inexpensive Surface Mount Inductors
s
8-Lead DIP or SOIC Package
s
Palmtop Computers
s
Portable Instruments
s
Bar-Code Scanners
s
DC/DC Converter Module Replacements
s
Battery Backup Supplies
s
Personal Digital Assistants
s
PCMCIA Cards
The LT1300 is a micropower step-up DC/DC converter that
utilizes Burst Mode™ operation. The device can deliver 5V
or 3.3V from a two-cell battery input. It features program-
mable 5V or 3.3V output via a logic-controlled input, no-
load quiescent current of 120
µAandashutdownpinwhich
reduces supply current to 10
µA.Theon-chippowerswitch
has a low 170mV saturation voltage at a switch current of
1A, a four-fold reduction over prior designs. A 155kHz
internal oscillator allows the use of extremely small sur-
face mount inductors and capacitors. Operation is guaran-
teed at 1.8V input. This allows more energy to be extracted
from the battery increasing operating life. The ILIM pin can
be used to program peak switch current with a single
resistor allowing the use of less expensive and smaller
inductors and capacitors in lighter load applications. The
LT1300 is available in an 8-lead SOIC package, minimizing
board space requirements. For a 5V/12V Selectable Out-
put Converter see the LT1301. For increased output cur-
rent see the LT1302.
DESCRIPTION
FEATURES
TYPICAL APPLICATIONS N
Micropower High Efficiency
3.3/5V Step-Up DC/DC Converter
APPLICATIONS
Two-Cell to 3.3V/5V Step-Up Converter
5V Output Efficiency
L1 = COILCRAFT DO1608-103
OR SUMIDA CD54-100
C1 = AVX TPSD107M010R0100
OR SANYO OS-CON 16SA100M
D1 = MBRS130LT3
OR 1N5817
C1
100µF
5V/3.3V
OUTPUT
+
+
L1
10µH
D1
C1
100µF
2
×
AA
CELL
SW
ILIM
PGND
GND
SENSE
LT1300
SELECT
LT1300 TA1
5V/3.3V
SELECT
SHDN
SHUTDOWN
N/C
2
67
4
5
81
3
VIN
LOAD CURRENT (mA)
10
100
500
LT1300 TA2
1
74
76
78
80
82
90
84
86
88
VIN = 4.0V
VIN = 3.0V
VIN = 2.5V
VIN = 2.0V
Burst Mode is a trademark of Linear Technology Corporation.


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