LT1949ES8#PBF Linear Technology, LT1949ES8#PBF Datasheet

IC CONV DC/DC PWM STEP UP 8SOIC

LT1949ES8#PBF

Manufacturer Part Number
LT1949ES8#PBF
Description
IC CONV DC/DC PWM STEP UP 8SOIC
Manufacturer
Linear Technology
Type
Step-Up (Boost)r
Datasheet

Specifications of LT1949ES8#PBF

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.24 ~ 30 V
Current - Output
1A
Frequency - Switching
600kHz
Voltage - Input
1.7 ~ 12 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LT1949ES8#PBFLT1949ES8
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LT1949ES8#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LT1949ES8#PBFLT1949ES8#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
1A, 0.5 , 30V Internal Switch
Operates with V
600kHz Fixed Frequency Operation
Low-Battery Detector Stays Active in Shutdown
Low V
Pin-for-Pin Compatible with the LT1317B
Small 8-Lead MSOP and SO Packages
LCD Bias Supplies
GPS Receivers
Battery Backup
Portable Electronic Equipment
Diagnostic Medical Instrumentation
3.3V
V
IN
Figure 1. 3.3V to 10V/175mA DC/DC Converter
+
CESAT
C1: AVX TAJA226M006R
C2: TAIYO YUDEN LMK325BJ106MN
D1: MBRM120LT3
L1: SUMIDA CDRH62B-100
SHUTDOWN
C1
22 F
Switch: 410mV at 800mA
IN
U
as Low as 1.5V
SHDN
V
V
IN
C
68k
LT1949
330pF
10 H
L1
GND
SW
U
FB
R2
140k
D1
1M
R1
C2
10 F
CERAMIC
V
10V
175mA
OUT
1949 F01
DESCRIPTIO
The LT
verter with a 1A, 0.5 internal switch. Capable of gener-
ating 10V at 175mA from a 3.3V input, the LT1949 is ideal
for generating bias voltages for large screen LCD panels.
Constant frequency 600kHz operation results in a low
noise output that is easy to filter and the 30V switch rating
allows output voltage up to 28V using a single inductor. An
external compensation pin gives the user flexibility in
optimizing loop compensation, allowing small low ESR
ceramic capacitors to be used at the output. The 8-lead
MSOP and SO packages ensure a low profile overall
solution.
The LT1949 includes a low-battery detector that stays
alive when the device goes into shutdown. Quiescent
current in shutdown is 25 A, while operating current is
4.5mA.
, LTC and LT are registered trademarks of Linear Technology Corporation.
PWM DC/DC Converter
®
1949 is a fixed frequency step-up DC/DC con-
Figure 2. 3.3V to 10V Converter Efficiency
90
80
70
60
50
40
30
20
5
V
OUT
10
= 10V
600kHz, 1A Switch
U
LOAD CURRENT (mA)
3.6V
50
IN
100
4.2V
IN
3V
1949 F02
IN
300
LT1949
1

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LT1949ES8#PBF Summary of contents

Page 1

... The 8-lead MSOP and SO packages ensure a low profile overall solution. The LT1949 includes a low-battery detector that stays alive when the device goes into shutdown. Quiescent current in shutdown while operating current is 4.5mA. , LTC and LT are registered trademarks of Linear Technology Corporation ...

Page 2

LT1949 ABSOLUTE AXI U RATI LBO Voltage ..................................................... 12V IN SW Voltage ............................................... – 0.4V to 30V FB Voltage .................................................... V V Voltage ................................................................ 2V C LBI Voltage ............................................ 0V V SHDN Voltage ........................................................... ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are T SYMBOL PARAMETER Switch V CESAT Reference Line Regulation SHDN Input Voltage High SHDN Input Voltage Low Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may ...

Page 4

LT1949 W U TYPICAL PERFOR A CE CHARACTERISTICS Quiescent Current, SHDN = –50 – TEMPERATURE ( C) 1317 TPC10 Load Regulation V OUT 50mV/DIV DC COUPLED OFFSET ADDED ...

Page 5

W BLOCK DIAGRA 1.24V + REFERENCE FB – OUT R1 (EXTERNAL (EXTERNAL) GENERATOR OSCILLATOR U OPERATIO The LT1949 is a current mode, fixed frequency step-up DC/DC converter with an internal 1A NPN power transis- tor. Operation ...

Page 6

LT1949 U OPERATIO GROUND PLANE Figure 4. Recommended Component Placement for Boost Converter. Note Direct High Current Paths Using Wide PC Traces. Minimize Trace Area at Pin 1 (V Use Multiple Vias to Tie Pin 4 Copper to Ground Plane. ...

Page 7

... 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 8

... No Inductors 50mA from 3V Input Q 3. 200mA, SOT-23 Package 3.3V and 5V Outputs with 50mA Output 23V 5mA C9 0 200mA 4 4.7 F –8V 10mA 1949 TA01 Q Noise 80mA Output RMS = 13 A, SOT-23 Package Q 1949f LT/TP 0300 4K • PRINTED IN THE USA LINEAR TECHNOLOGY CORPORATION 1999 ...

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