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LT3430 Datasheet(PDF) 1 Page - Linear Technology

Part # LT3430
Description  High Voltage, 3A, 200kHz Step-Down Switching Regulator
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3430 Datasheet(HTML) 1 Page - Linear Technology

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1
LT3430
sn3430 3430is
High Voltage, 3A,
200kHz Step-Down
Switching Regulator
August 2002
s
Wide Input Range: 5.5V to 60V
s
3A Peak Switch Current
s
Small Thermally Enhanced 16-Pin TSSOP Package
s
Constant 200kHz Switching Frequency
s
Saturating Switch Design: 0.1
s
Peak Switch Current Maintained Over
Full Duty Cycle Range
s
Effective Supply Current: 2.5mA
s
Shutdown Current: 30
µA
s
1.2V Feedback Reference Voltage
s
Easily Synchronizable
s
Cycle-by-Cycle Current Limiting
The LT
®3430 is a 200kHz monolithic buck switching regu-
lator that accepts input voltages up to 60V. A high efficiency
3A, 0.1
Ωswitchisincludedonthediealongwithallthenec-
essary oscillator, control and logic circuitry. A current mode
architecture provides fast transient response and excellent
loop stability.
Special design techniques and a new high voltage process
achieve high efficiency over a wide input range. Efficiency
is maintained over a wide output current range by using the
output to bias the circuitry and by utilizing a supply boost
capacitor to saturate the power switch. Patented circuitry
maintains peak switch current over the full duty cycle range.
A shutdown pin reduces supply current to 30
µAandaSYNC
pin can be externally synchronized from 228kHz to 700kHz
with a logic level input.
The LT3430 is available in a thermally enhanced 16-pin
TSSOP package.
s
Industrial and Automotive Power Supplies
s
Portable Computers
s
Battery Chargers
s
Distributed Power Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
5V, 2A Buck Converter
Efficiency vs Load Current
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
BOOST
VIN
6
2, 5
10
12
30BQ060
15.4k
VOUT
5V
2A
3, 4
15
14
11
220pF
0.022
µF
*
FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY
UNITED CHEMI-CON
1, 8, 9, 16
LT3430
SHDN
SYNC
SW
BIAS
FB
VC
GND
0.68
µF
100
µF 10V
SOLID
TANTALUM
22
µH
MMSD914TI
4.99k
3430 TA01
4.7
µF 100V
CERAMIC
ON
OFF
VIN
5.5V*
TO 60V
+
3.3k
LOAD CURRENT (A)
0
80
90
100
2.0
3430 TA02
70
60
50
0.5
1.0
1.5
2.5
VIN = 12V
VIN = 42V
VOUT = 5V
L = 27
µH
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.
Final Electrical Specifications


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