LTC1649 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1649' PDF : 16 Pages View PDF
LTC1649
TYPICAL APPLICATIO
SHDN
10µF
CERAMIC
SSTL Logic Termination Supply
VIN
3.3V
MBR0530
1µF
CERAMIC
Q1
1/2
Si9802
22Ω
7.5k
0.01µF
220pF
NC
0.1µF
PVCC1
G1
PVCC2
IFB
VCC
G2
LTC1649
IMAX
FB
SHDN VIN
C+
COMP
SS
C–
GND CPOUT
Q2
1/2
Si9802
1µF
CERAMIC
+
MBR0530
10µF
LEXT
1.5µH
R1
18.2k
R2
15k
+
1500µF
VOUT
= 0.45VIN AT ±5A
= 1.48V AT VIN = 3.3V
+
1500µF
Si9802 = SILICONIX
2200pF
4.7k
0.1µF
–
10k
+
1/2 LT1211
10k
50pF
10k
–
+ 1/2 LT1211
1649 TA04
RELATED PARTS
PART NUMBER
LTC1430A
DESCRIPTION
High Power Step-Down Switching Regulator Controller
LTC1517-5
LTC1702
Micropower, Regulated 5V Charge Pump in a 5-Pin SOT-23 Package
2-Phase, Dual Output DC/DC Step-Down Controller
LTC1772
LTC1773
LTC1874
LTC1876
SOT-23 Step-Down DC/DC Controller
3.3V Input DC/DC Synchronous Step-Down Controller
Dual Output DC/DC Step-Down Controller
Triple Ouput 2-Phase DC/DC Controller
COMMENTS
5V to 1.xV @10A, Maximum Duty cycle > 90% Permits
3.3V to 2.xV Conversion
Low Power 3.3V to 5V Step-Up Converter
3.3V Input to As Low As 0.8V Conversion, Minimum CIN
and COUT
550kHz Operation for Small Circuit
550kHz Operation, Up to 6A Output, 10-Lead MSOP
550kHz Operation, Up to 4A Output, 16-Lead SSOP
Converts 3.3VIN to Two Output Voltages Using 5V Logic
N-Channel MOSFETS, Eliminates Need for Auxiliary 5V
Supply, >90% Efficiency
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX:(408)434-0507 q www.linear-tech.com
1649fa LT/TP 0501 REV A 2K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1998
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