LT1303CS8-5 Linear Technology, LT1303CS8-5 Datasheet

IC DC/DC CONV STEP-UP 5V 8-SOIC

LT1303CS8-5

Manufacturer Part Number
LT1303CS8-5
Description
IC DC/DC CONV STEP-UP 5V 8-SOIC
Manufacturer
Linear Technology
Type
Step-Up (Boost)r
Datasheet

Specifications of LT1303CS8-5

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
5V
Current - Output
200mA
Frequency - Switching
155kHz
Voltage - Input
1.8 ~ 6 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

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1303CS8-5
Manufacturer:
LT
Quantity:
10 000
Part Number:
LT1303CS8-5
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT1303CS8-5#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT1303CS8-5#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
APPLICATIONS
TYPICAL
L1 = SUMDIA CD54-220
5V at 200mA from a 2V Input
Supply Voltage As Low As 1.8V
Up to 88% Efficiency
120 A Quiescent Current
Low-Battery Detector
Low V
Uses Inexpensive Surface Mount Inductors
8-Lead PDIP or SO Package
EL Panel Drivers
2-Cell and 3-Cell to 5V Conversion
Palmtop Computers
Portable Instruments
Bar-Code Scanners
PDAs
Wireless Systems
2 CELLS
Figure 1. 2-Cell to 5V DC/DC Converter with Low-Battery Detect
CESAT
+
APPLICATION
100 F
Switch: 170mV at 1A Typ
U
316k
1%
412k
1%
SHUTDOWN
LBI
SHDN
U
GND
V
IN
LT1303-5
22 H
L1
PGND
SENSE
SW
LBO
1N5817
100 F
100k
+
V
200mA
LOW BATTERY
GOES LOW AT
V
OUT
BAT
Burst Mode is a trademark of Linear Technology Corporation.
The LT
efficiency DC/DC converters using Burst Mode
tion. They are ideal for use in small, low-voltage battery-
operated systems. The LT1303-5 accepts an input voltage
between 1.8V and 5V and converts it to a regulated 5V. The
LT1303 is an adjustable version that can supply an output
voltage up to 25V. Quiescent current is only 120 A from
the battery and the shutdown pin further reduces current
to 10 A. The low-battery detector provides an open-
collector output that goes low when the input voltage
drops below a preset level. The on-chip NPN power switch
has a low 170mV saturation voltage at a switch current
of 1A. The LT1303/LT1303-5 are available in 8-lead PDIP
or SO packages, easing board space requirements.
For higher output current, please see the LT1305 or
LT1302.
DESCRIPTION
, 5V
= 2.2V
LT1303 TA02
, LTC and LT are registered trademarks of Linear Technology Corporation.
Micropower High Efficiency
®
1303/LT1303-5 are micropower step-up high
Adjustable and Fixed 5V
DC/DC Converters with
Low-Battery Detector
90
80
70
60
50
40
30
U
0.1
LT1303/LT1303-5
5V Output Efficiency
1
LOAD CURRENT (mA)
V
V
IN
IN
V
IN
= 2.5V
= 4V
= 3V
10
100
V
IN
LT1303 TA01
= 2V
TM
1000
opera-
1

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LT1303CS8-5 Summary of contents

Page 1

... The LT1303/LT1303-5 are available in 8-lead PDIP or SO packages, easing board space requirements. For higher output current, please see the LT1305 or LT1302. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. L1 1N5817 22 H ...

Page 2

... ESR is excessive INFORMATION ORDER PART TOP VIEW NUMBER PGND 8 LT1303CN8 7 SW LT1303CS8 LT1303CN8-5 5 LBI LT1303CS8-5 N8 PACKAGE 8-LEAD PDIP S8 PART MARKING S8 PACKAGE 8-LEAD PLASTIC SO 1303 *FIXED VERSION 13035 = 130 C/W (N8 150 C/W (S8) JA MIN TYP MAX 120 200 ...

Page 3

W U TYPICAL PERFORMANCE CHARACTERISTICS V vs Switch Current CESAT 250 225 200 175 150 125 100 0.1 1.0 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 SWITCH CURRENT (A) LT1303 G01 LT1303 FB Voltage 1.250 ...

Page 4

LT1303/LT1303 TYPICAL PERFORMANCE CHARACTERISTICS Switch On-Time – –25 TEMPERATURE ( C) LT1303 G10 Quiescent Current 200 SWITCH OFF 190 180 170 160 150 ...

Page 5

PIN FUNCTIONS GND (Pin 1): Signal Ground. Tie to PGND under the package. LBO (Pin 2): Open-Collector Output of Low-Battery Com- parator. Can sink 100 A. Disabled when device is in shutdown. SHDN (Pin 3): Shutdown. Pull ...

Page 6

LT1303/LT1303-5 W BLOCK I D AGRA 474k REFERENCE R2 1.24V 156k GND 1 U OPERATION Operation of the LT1303 is best understood by referring to the Block Diagram in Figure 2. When C1’s negative input, ...

Page 7

U OPERATION to about 2 s. Response time of C2, which determines minimum on-time, is approximately 300ns. Low Battery Detector The low battery detector is enabled when SHDN is low and disabled when SHDN is high. The comparator has no ...

Page 8

LT1303/LT1303 APPLICATIONS INFORMATION Figure 8. This Inductor Saturates at I Figure 9. Slight Exponential Shape to Inductor Current Waveform Indicates Excessive DC Resistance Diode Selection The LT1303’s high switching speed demands a high speed rectifier. Schottky diodes are ...

Page 9

U TYPICAL APPLICATIONS INPUT 1.8V TO 4.5V V OUTPUT REF 1.24V + * SUMIDA CD54-220MC Setting Output Voltage on LT1303 1N5817 LT1303 100 F FB GND PGND R1 = 1.24V 1 + ...

Page 10

LT1303/LT1303-5 U TYPICAL APPLICATIONS 3-Cell to 3.3V Boost/Linear Converter with Output Disconnect SHUTDOWN + SUMIDA CD54-100MC ** AVX TPS 330 F/6.3V † 1% METAL FILM 10 4-, 5-Cell ...

Page 11

... R1 ADJUSTS V 83V OUT 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 circuits as described herein will not infringe on existing patent rights. EL Panel Driver T1** MUR160 1:15 • ...

Page 12

... Includes Current Limit and Thermal Shutdown : 499-3977 TELEX 0.400* (10.160) MAX 0.255 0.015* (6.477 0.381 0.189 – 0.197* (4.801 – 5.004 0.150 – 0.157** 0.228 – 0.244 (3.810 – 3.988) (5.791 – 6.197 SO8 0695 LT/GP 0195 10K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1995 N8 0695 ...

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