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LT3430EFE Datasheet

  • LT3430EFE

  • High Voltage, 3A, 200kHz Step-Down Switching Regulator

  • 28頁(yè)

  • LINER

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Final Electrical Specifications
LT3430
High Voltage, 3A,
200kHz Step-Down
Switching Regulator
August 2002
FEATURES
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
Wide Input Range: 5.5V to 60V
3A Peak Switch Current
Small Thermally Enhanced 16-Pin TSSOP Package
Constant 200kHz Switching Frequency
Saturating Switch Design: 0.1鈩?/div>
Peak Switch Current Maintained Over
Full Duty Cycle Range
Effective Supply Current: 2.5mA
Shutdown Current: 30碌A(chǔ)
1.2V Feedback Reference Voltage
Easily Synchronizable
Cycle-by-Cycle Current Limiting
The LT
廬
3430 is a 200kHz monolithic buck switching regu-
lator that accepts input voltages up to 60V. A high efficiency
3A, 0.1鈩?switch is included on the die along with all the nec-
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碌A(chǔ) and a SYNC
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
Industrial and Automotive Power Supplies
Portable Computers
Battery Chargers
Distributed Power Systems
TYPICAL APPLICATIO
6
V
IN
5.5V*
TO 60V
4.7碌F 100V
CERAMIC
鈥?/div>
OFF ON
15
14
BOOST
3, 4
V
IN
LT3430
SHDN
SYNC
GND
1, 8, 9, 16
3.3k
0.022碌F
5V, 2A Buck Converter
0.68碌F
SW
2, 5
30BQ060
MMSD914TI
22碌H
V
OUT
5V
2A
+
BIAS
FB
V
C
11
220pF
10
12
15.4k
4.99k
EFFICIENCY (%)
100碌F 10V
SOLID
TANTALUM
*FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY
鈥?/div>
UNITED CHEMI-CON
3430 TA01
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.
U
100
V
OUT
= 5V
L = 27碌H
90
80
70
60
50
0
0.5
U
U
Efficiency vs Load Current
V
IN
= 12V
V
IN
= 42V
1.5
2.0
1.0
LOAD CURRENT (A)
2.5
3430 TA02
sn3430 3430is
1

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