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LTC1649 Datasheet(PDF) 16 Page - Linear Technology

Part # LTC1649
Description  3.3V Input High Power Step-Down Switching Regulator Controller
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1649 Datasheet(HTML) 16 Page - Linear Technology

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



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