LT1317CS8 Linear Technology, LT1317CS8 Datasheet

IC BOOST ADJ .5A 8SOIC

LT1317CS8

Manufacturer Part Number
LT1317CS8
Description
IC BOOST ADJ .5A 8SOIC
Manufacturer
Linear Technology
Type
Step-Up (Boost)r
Datasheet

Specifications of LT1317CS8

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.24 ~ 30 V
Current - Output
500mA
Frequency - Switching
620kHz
Voltage - Input
1.5 ~ 12 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1317CS8
Manufacturer:
LT
Quantity:
10 000
Part Number:
LT1317CS8
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT1317CS8#PBF
Manufacturer:
LT
Quantity:
5
Part Number:
LT1317CS8#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
APPLICATIONS
TYPICAL
100 A Quiescent Current
Operates with V
600kHz Fixed Frequency Operation
Starts into Full Load
Low-Battery Detector Active in Shutdown
Automatic Burst Mode Operation at
Light Load (LT1317)
Continuous Switching at Light Loads (LT1317B)
Low V
Pin for Pin Compatible with the LT1307/LT1307B
Cellular Telephones
Cordless Telephones
Pagers
GPS Receivers
Battery Backup
Portable Electronic Equipment
Glucose Meters
Diagnostic Medical Instrumentation
D1: MBR0520
L1: SUMIDA CD43-100
* FOR 5V OUTPUT, R2 = 332k, 1%
2
CELLS
CESAT
+
Figure 1. 2-Cell to 3.3V Boost Converter
SHUTDOWN
APPLICATION
C1
47 F
Switch: 300mV at 500mA
IN
U
as Low as 1.5V
LBI
SHDN
V
V
IN
C
R
33k
LT1317
C
C
3.3nF
10 H
C
L1
GND
LBO
SW
FB
U
D1
R2*
604k
1%
1M
1%
R1
+
1317 F01
3.3V
200mA
C2
47 F
DESCRIPTION
The LT
step-up DC/DC converters that operate over a wide input
voltage range of 1.5V to 12V. The LT1317 features auto-
matic shifting to power saving Burst Mode
light loads. High efficiency is maintained over a broad
300 A to 200mA load range. Peak switch current during
Burst Mode operation is kept below 250mA for most
operating conditions which results in low output ripple
voltage, even at high input voltages. The LT1317B does
not shift into Burst Mode operation at light loads, eliminat-
ing low frequency output ripple at the expense of light load
efficiency.
The LT1317/LT1317B contain an internal low-battery de-
tector with a 200mV reference that stays alive when the
device goes into shutdown.
No-load quiescent current of the LT1317 is 100 A and
shuts down to 30 A. The internal NPN power switch
handles a 500mA current with a voltage drop of just
300mV.
The LT1317/LT1317B are available in MS8 and SO-8
packages.
Burst Mode is a trademark of Linear Technology Corporation.
Micropower, 600kHz PWM
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1317/LT1317B are micropower, fixed frequency
90
80
70
60
50
40
0.3
2-Cell to 3.3V Converter Efficiency
DC/DC Converters
1
U
LOAD CURRENT (mA)
2.2V
10
IN
LT1317/LT1317B
1.65V
3V
IN
IN
100
1317 TA01
1000
TM
operation at
1

Related parts for LT1317CS8

LT1317CS8 Summary of contents

Page 1

... No-load quiescent current of the LT1317 is 100 A and shuts down The internal NPN power switch handles a 500mA current with a voltage drop of just 300mV. The LT1317/LT1317B are available in MS8 and SO-8 packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation 3.3V ...

Page 2

... SHDN V = 2V, Switching (LT1317B) SHDN V = 2V, Switching (LT1317B) SHDN 2.5V, Duty Cycle = 30 2.5V, Duty Cycle = 30% IN Duty Cycle = 30% (LT1317) ORDER PART TOP VIEW NUMBER 8 LBO LT1317CS8 7 LBI LT1317BCS8 LT1317IS8 SW 5 LT1317BIS8 S8 PACKAGE S8 PART MARKING = 125 C, = 120 C/W JA 1317 1317B 1317I 1317BI ...

Page 3

ELECTRICAL C HARA TERISTICS C Commercial Grade SHDN SYMBOL PARAMETER Shutdown Pin Current LBI Threshold Voltage LBO Output Low LBO Leakage Current LBI Input Bias Current (Note 4) Low-Battery Detector Gain Switch ...

Page 4

LT1317/LT1317B W U TYPICAL PERFOR A CE CHARACTERISTICS Oscillator Frequency 700 –40 C 650 600 550 500 INPUT VOLTAGE 1317 TPC01 Switch Current Limit 1200 1000 TYPICAL 800 600 MINIMUM ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Quiescent Current, SHDN = –50 – TEMPERATURE ( C) 1317 TPC10 5V Output Efficiency, Circuit of Figure 1 (LT1317 ...

Page 6

LT1317/LT1317B W U TYPICAL PERFOR A CE CHARACTERISTICS Load Regulation (LT1317) V OUT 50mV/DIV DC COUPLED OFFSET ADDED V = 1.5V I 25mA/DIV IN LOAD 1317 TPC19 OUT Load Regulation (LT1317) V OUT 50mV/DIV DC COUPLED OFFSET ...

Page 7

W BLOCK DIAGRAM 1.24V + REFERENCE FB – OUT R1 (EXTERNAL (EXTERNAL) GENERATOR OSCILLATOR U U APPLICATIONS INFORMATION OPERATION The LT1317 combines a current mode, fixed frequency PWM architecture with Burst Mode micropower operation to maintain ...

Page 8

... LT1317. This is IN not an exclusive list. There are many magnetics vendors whose components are suitable for use. A few vendor’s components are listed in Table 1. GROUND PLANE 1 8 LT1317 MULTIPLE VIAs C OUT GND V OUT losses. Linear Technology has identified V IN 1317 F03 Pin is Kept ...

Page 9

U U APPLICATIONS INFORMATION Table 1. Inductors Suitable for Use with the LT1317 MAX PART VALUE DCR MFR LQH3C100 10 H 0.57 Murata-Erie DO1608-103 10 H 0.16 Coilcraft CD43-100 10 H 0.18 Sumida CD54-100 10 H 0.10 Sumida CTX32CT-100 10 ...

Page 10

LT1317/LT1317B U U APPLICATIONS INFORMATION FREQUENCY COMPENSATION The LT1317 has an external compensation pin (V allows the frequency response to be optimized for the circuit configuration. In most cases, the values used in Figure 1 will work. Some circuits may ...

Page 11

U U APPLICATIONS INFORMATION LOW-BATTERY DETECTOR The LT1317’s low-battery detector is a simple PNP input gain stage with an open collector NPN output. The nega- tive input of the gain stage is tied internally to a 200mV 5% reference. The ...

Page 12

LT1317/LT1317B U TYPICAL APPLICATIO 12V Boost Converter LT1317 SHUTDOWN SHDN SHDN LB0 V GND C 56k 3300pF L1: SUMIDA CD54-220 Single Li-Ion to 5V ...

Page 13

U TYPICAL APPLICATIO S 2-Cell to 5V DC/DC Converter with Undervoltage Lockout + 2 ALKALINE CELLS D1: MOTOROLA MBR0520LT1 L1: SUMIDA CD43-101 STARTS AT V STOPS 1.5V TO 10V 2 Li-ION CELLS (5.8V TO 8.4V) L1 ...

Page 14

LT1317/LT1317B U TYPICAL APPLICATIO S 4.5V TO 2.5V D1: D2: L1, L2 10V C1: AVX TAJ156M010 C2: SANYO 35CV33GX C3, C4, C5, C6: 0.1 F CERAMIC D1, D2, D3: MOTOROLA MMBD914LT1 ...

Page 15

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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 16

... Cell, MSOP Package 2 Adjustable Hysteresis Inductors 50mA from 3V Input Q 500mV Dropout, 300mA Current 10k 24V 18V + 3mA 35V 5V + 20mA 10V 3.3V + 150mA C2 100 F 6V 1317 TA10 , 300mA 13177bf LT/TP 1198 4K • PRINTED IN THE USA LINEAR TECHNOLOGY CORPORATION 1998 ...

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