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Linear Technology LT1300 Manual

Micropower high efficiency 3.3/5v step-up dc/dc converter
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FEATURES
Up to 220mA Output Current at 5V from 2V Supply
Supply Voltage as Low as 1.8V
Up to 88% Efficiency
Small Inductor –10µH
120µA Quiescent Current
Shutdown to 10µA
Programmable 3.3V or 5V Output
I
Pin Programs Peak Switch Current
LIM
Low V
Switch: 170mV at 1A Typical
CESAT
Uses Inexpensive Surface Mount Inductors
8-Lead DIP or SOIC Package
U
APPLICATIONS
Palmtop Computers
Portable Instruments
Bar-Code Scanners
DC/DC Converter Module Replacements
Battery Backup Supplies
Personal Digital Assistants
PCMCIA Cards
TYPICAL APPLICATIONS
Two-Cell to 3.3V/5V Step-Up Converter
6
V
IN
2
5V/3.3V
SELECT
SELECT
+
2×
C1
AA
100µF
CELL
3
SHUTDOWN
SHDN
PGND
8
L1 = COILCRAFT DO1608-103
OR SUMIDA CD54-100
C1 = AVX TPSD107M010R0100
OR SANYO OS-CON 16SA100M
D1 = MBRS130LT3
OR 1N5817
3.3/5V Step-Up DC/DC Converter
N
L1
10µH
D1
7
SW
4
SENSE
LT1300
+
C1
100µF
5
I
N/C
LIM
GND
1
Micropower High Efficiency
DESCRIPTION
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 120µA and a shutdown pin which
reduces supply current to 10µA. The on-chip power switch
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 I
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.
Burst Mode is a trademark of Linear Technology Corporation.
5V/3.3V
90
OUTPUT
88
86
84
82
80
78
76
LT1300 TA1
74
1
5V Output Efficiency
V
= 4.0V
IN
V
= 3.0V
IN
V
= 2.5V
IN
V
= 2.0V
IN
10
100
500
LOAD CURRENT (mA)
LT1300 TA2
LT1300
pin can
LIM
1

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Summary of Contents for Linear Technology LT1300

  • Page 1 DESCRIPTION FEATURES Up to 220mA Output Current at 5V from 2V Supply The LT1300 is a micropower step-up DC/DC converter that Supply Voltage as Low as 1.8V utilizes Burst Mode™ operation. The device can deliver 5V Up to 88% Efficiency or 3.3V from a two-cell battery input.
  • Page 2 LT1300 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION Voltage .............. 10V ORDER PART TOP VIEW SW1 Voltage ............20V NUMBER PGND Sense Voltage ............10V SHUTDOWN Voltage..........10V LT1300CN8 SHDN LT1300CS8 SELECT Voltage ............10V SENSE Voltage ............0.5V Maximum Power Dissipation ......500mW...

  • Page 3: Typical Performance Characteristics

    = 5V = 3V = 2.5V = 2V = 3.3V 1000 LOAD CURRENT (mA) INPUT VOLTAGE (V) INPUT VOLTAGE (V) LT1300 G1 LT1300 G2 LT1300 G3 Maximum Output Current Shutdown Pin Bias Current vs I vs Input Voltage CESAT = 5V, = 25°C...
  • Page 4 (see Figure 5). BLOCK DIAGRAM SENSE 18mV A2 CURRENT COMPARATOR 3Ω 500k 730Ω – COMPARATOR 1.25V ENABLE OSCILLATOR A3 DRIVER REFERENCE 155kHZ 144k – 160x BIAS 161k 8.5k SHUTDOWN SELECT PGND LT1300 F1 Figure 1.

  • Page 5: Test Circuits

    100µF LT1300 SHDN SENSE PGND OPERATION Operation of the LT1300 is best understood by referring to TRACE A the Block Diagram in Figure 1. When A1’s negative input, 500mA/DIV related to the Sense pin voltage by the appropriate resis- OPEN tor-divider ratio, is higher that the 1.25V reference voltage,...
  • Page 6 APPLICATIONS INFORMATION Output Voltage Selection 10µH The LT1300 can be selected to 3.3V or 5V under logic control or fixed at either by tying SELECT to ground or V respectively. It is permissible to tie SELECT to a voltage 5V/3.3V...
  • Page 7 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.

  • Page 8: Typical Applications

    MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm). SO8 0294 LT/GP 0394 10K • PRINTED IN USA Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7487 © LINEAR TECHNOLOGY CORPORATION 1994 (408) 432-1900 : (408) 434-0507 : 499-3977 TELEX...

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