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LTC1435C Datasheet

  • LTC1435C

  • Linear Technology [High Efficiency Low Noise Synchronous St...

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LTC1435
High Efficiency Low Noise
Synchronous Step-Down
Switching Regulator
FEATURES
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DESCRIPTION
The LTC
庐
1435 is a synchronous step-down switching
regulator controller that drives external N-channel power
MOSFETs using a fixed frequency architecture. Burst
Mode
TM
operation provides high efficiency at low load
currents. A maximum duty cycle limit of 99% provides low
dropout operation which extends operating time in bat-
tery-operated systems.
The operating frequency is set by an external capacitor
allowing maximum flexibility in optimizing efficiency. A
secondary winding feedback control pin, SFB, guarantees
regulation regardless of load on the main output by
forcing continuous operation. Burst Mode operation is
inhibited when the SFB pin is pulled low which reduces
noise and RF interference.
Soft start is provided by an external capacitor which can
be used to properly sequence supplies. The operating
current level is user-programmable via an external current
sense resistor. Wide input supply range allows operation
from 3.5V to 30V (36V maximum).
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
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Dual N-Channel MOSFET Synchronous Drive
Programmable Fixed Frequency
Wide V
IN
Range: 3.5V to 36V Operation
Ultrahigh Efficiency
Very Low Dropout Operation: 99% Duty Cycle
Low Standby Current
Secondary Feedback Control
Programmable Soft Start
Remote Output Voltage Sense
Logic Controlled Micropower Shutdown: I
Q
< 25碌A
Foldback Current Limiting (Optional)
Current Mode Operation for Excellent Line and Load
Transient Response
Output Voltages from 1.19V to 9V
Available in 16-Lead Narrow SO and SSOP Packages
APPLICATIONS
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Notebook and Palmtop Computers, PDAs
Cellular Telephones and Wireless Modems
Portable Instruments
Battery-Operated Devices
DC Power Distribution Systems
TYPICAL APPLICATION
C
OSC
68pF
C
OSC
C
SS
0.1碌F
C
C
330pF
R
C
10k
SGND
100pF
V
OSENSE
SENSE
鈥?/div>
BG
PGND
SENSE
+
RUN/SS
I
TH
LTC1435
INTV
CC
BOOST
V
IN
TG
SW
V
IN
4.5V TO 28V
M1
Si4412DY
+
C
IN
22碌F
35V
脳
2
D
B
CMDSH-3
C
B
0.1碌F
L1
10碌H
+
4.7碌F
M2
Si4412DY
D1
MBRS140T3
1000pF
Figure 1. High Efficiency Step-Down Converter
U
U
U
R
SENSE
0.033鈩?/div>
V
OUT
2.9V/3.5A
R1
32.4k
R2
22.1k
C
OUT
+
100碌F
10V
脳
2
1435 F01
1

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