LT1301CS8#TR Linear Technology, LT1301CS8#TR Datasheet

IC CONV DC/DC STEPUP HIEFF 8SOIC

LT1301CS8#TR

Manufacturer Part Number
LT1301CS8#TR
Description
IC CONV DC/DC STEPUP HIEFF 8SOIC
Manufacturer
Linear Technology
Type
Step-Up (Boost)r
Datasheet

Specifications of LT1301CS8#TR

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
5V, 12V
Frequency - Switching
155kHz
Voltage - Input
1.8 ~ 10 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Power - Output
500mW
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Output
-

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3.3V
OR
FEATURES
APPLICATIONS
TYPICAL APPLICATIONS
5V
Figure 1. 3.3V/5V to 12V Step-Up Converter
12V at 120mA from 5V or 3.3V Supply
Supply Voltage as Low as 1.8V
Better High Current Efficiency Than CMOS
Up to 89% Efficiency
120 A Quiescent Current
Shutdown to 10 A
Programmable 5V or 12V Output
Low V
I
Uses Inexpensive Surface Mount Inductors
8-Lead DIP or SOIC Package
Flash Memory V
Palmtop Computers
Portable Instruments
Bar-Code Scanners
Personal Digital Assistants
PCMCIA Cards
LIM
*REQUIRED FOR 5V OUTPUT
+
SHUTDOWN
L1 = COILCRAFT DO3316-333
D1 = 1N5817 OR MOTOROLA
C1 = AVX TPSD476M016R0100
C2 = AVX TPSD336M020R0100
C1
47µF
Pin Programs Peak Switch Current
OR SUMIDA CD73-330KC
MBRS130LT3
OR SANYO OS-CON 165A47M
OR SANYO OS-CON 205A33M
CESAT
SHDN
SELECT
PGND
V
IN
Switch: 170mV at 1A Typical
LT1301
33µH
L1
PP
U
SENSE
Generator
GND
SW
I
LIM
D1
N/C
+
C2
33µF
20V
LT1301 F1
12V
OUTPUT
U
N
0.1µF*
SHUTDOWN
10V/DIV
2V/DIV
V
12V
OUT
V
LOAD = 100
IN
= 5V, V
OUT
Output Voltage
= 12V
Converter for Flash Memory
Micropower High Efficiency
DESCRIPTION
The LT1301 is a micropower step-up DC/DC converter that
utilizes Burst Mode™ operation. The device can deliver 5V
or 12V from a two-cell battery input. It features program-
mable 5V or 12V output via a logic-controlled input, no-
load quiescent current of 120 A and a shutdown pin which
reduces supply current to 10 A. 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 for soft start or to program peak switch current
with a single resistor allowing the use of even smaller
inductors in lighter load applications. The LT1301 is
available in an 8-lead SOIC package, minimizing board
space requirements. For a selectable 3.3V/5V step-up
converter, please see the LT1300. For higher output
power, see the LT1302.
Burst Mode is a trademark of Linear Technology Corporation.
1ms/DIV
5V/12V Step-Up DC/DC
LT1301 TAO1
U
90
88
86
84
82
80
78
76
74
72
0
1
LOAD CURRENT (mA)
Efficiency
10
V
V
IN
IN
= 5V
= 3.3V
LT1301
LIM
pin can
100
LT1300 F2
LT1301 TA2
1
300

Related parts for LT1301CS8#TR

LT1301CS8#TR Summary of contents

Page 1

... The LT1301 is available in an 8-lead SOIC package, minimizing board space requirements. For a selectable 3.3V/5V step-up converter, please see the LT1300. For higher output power, see the LT1302. Burst Mode is a trademark of Linear Technology Corporation Output Voltage 12V ...

Page 2

LT1301 ABSOLUTE MAXIMUM V Voltage .............................................................. 10V IN SW1 Voltage ............................................................ 20V Sense Voltage .......................................................... 20V Shutdown Voltage ................................................... 10V Select Voltage .......................................................... 10V I Voltage ............................................................ 0.5V LIM Maximum Power Dissipation ............................. 500mW Operating Temperature Range ...

Page 3

W TYPICAL PERFORMANCE CHARACTERISTICS 5V Output Efficiency 3. 2. 100 LOAD CURRENT (mA) LT1301 G1 Saturation Voltage vs Switch Current 250 ...

Page 4

LT1301 PIN FUNCTIONS GND (Pin 1): Signal Ground. Tie to PGND under the package. Sel (Pin 2): Output Select. When tied to V regulates at 12V. When grounded or floating converter regulates at 5V. May be driven ...

Page 5

TEST CIRCUITS U OPERATION Operation of the LT1301 is best understood by referring to the Block Diagram in Figure 2. When A1’s negative input, related to the Sense pin voltage by the appropriate resis- tor-divider ratio is higher that the ...

Page 6

LT1301 U U APPLICATIONS INFORMATION V OUT 100mV/DIV AC COUPLED V SW 10V/DIV I L 500mA/DIV 20 s/DIV 12V OUT 90mA OUT LOAD Figure ...

Page 7

U U APPLICATIONS INFORMATION Table 1. Recommended Inductors PART NUMBER VENDOR DCR ( ) V DO3316-333 Coilcraft 33 DO1608-223 Coilcraft 22 DO1608-103 Coilcraft 10 CTX20-1 Coiltronics 20 GA10-332 Gowanda 33 LQH3G220K04M00 Murata-Erie 22 CD73-330KC Sumida 33 CDRH62-330MC ...

Page 8

LT1301 U U APPLICATIONS INFORMATION Capacitor Selection Low ESR capacitors are required for both input and output of the LT1301. ESR directly affects ripple voltage and efficiency. For surface mount applications AVX TPS series tantalum capacitors are recommended. These have ...

Page 9

U TYPICAL APPLICATIONS 100µ DALE LPE-5047-AO45 (605) 665-9301 SENSE NC LT1301 0.1µF SHDN GND SHUTDOWN T1 = COILTRONICS CTX110654 COILCRAFT D03316-473 N ...

Page 10

LT1301 U TYPICAL APPLICATIONS 5V + 33µ COILTRONICS CTX33 – 5V Converter L1 33µ 1N965 1N5817 1 4 1N4148 SELECT SHDN NC SHUTDOWN LT1301 OR 0.1µF LT1300 NC SENSE ...

Page 11

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm). 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 12

... Linear Technology Corporation Rm. 801, No. 46, Sec. 2 Chung Shan N. Rd. Taipei, Taiwan, R.O.C. Phone: 886-2-521-7575 FAX: 886-2-562-2285 UNITED KINGDOM Linear Technology (UK) Ltd. The Coliseum, Riverside Way Camberley, Surrey GU15 3YL United Kingdom Phone: 44-276-677676 FAX: 44-276-64851 08/16/93 LT/GP 0394 10K • PRINTED IN USA ...

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