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LTC1435AIS#TR

Description
DC/DC Cntrlr Single-OUT Step Down 138kHz Automotive 16-Pin SOIC N T/R
CategoryPower/power management    The power supply circuit   
File Size329KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LTC1435AIS#TR Overview

DC/DC Cntrlr Single-OUT Step Down 138kHz Automotive 16-Pin SOIC N T/R

LTC1435AIS#TR Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerADI
package instructionSOP, SOP16,.25
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage30 V
Minimum input voltage3.5 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G16
JESD-609 codee0
length9.9 mm
Number of functions1
Number of terminals16
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current2 A
Maximum output voltage9 V
Minimum output voltage1.19 V
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP16,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationPUSH-PULL
Maximum switching frequency138 kHz
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
width3.9116 mm
LTC1435A
High Efficiency Low Noise
Synchronous Step-Down
Switching Regulator
FEATURES
s
s
s
s
DESCRIPTION
The LTC
®
1435A is a synchronous step-down switching
regulator controller that drives external N-channel power
MOSFETs using a fixed frequency architecture. A wide
duty cycle range of 5% to 99% allows high V
IN
to low V
OUT
DC/DC conversion, as well as low dropout operation that
extends operating time in battery-operated systems. Burst
Mode
TM
operation provides high efficiency at low load
currents.
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 that can be
used to properly sequence supplies. The operating cur-
rent 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.
s
s
s
s
s
s
s
s
s
s
Dual N-Channel MOSFET Synchronous Drive
Programmable Fixed Frequency
Wide V
IN
Range: 3.5V to 36V Operation
Low Minimum On-Time (
300ns) for High
Frequency, Low Duty Cycle Applications
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
< 25µA
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
s
s
s
s
s
Notebook and Palmtop Computers, PDAs
Cellular Telephones and Wireless Modems
Portable Instruments
Battery-Operated Devices
DC Power Distribution Systems
TYPICAL APPLICATION
V
IN
4.5V TO 22V
C
OSC
43pF
C
OSC
C
SS
0.1µF
C
C
330pF
R
C
10k
SGND
100pF
V
OSENSE
SENSE
BG
PGND
SENSE
+
RUN/SS
I
TH
LTC1435A
INTV
CC
BOOST
V
IN
TG
SW
M1
Si4412DY
+
C
IN
22µF
35V
×
2
R
SENSE
0.033Ω
D
B
CMDSH-3
C
B
0.1µF
L1
4.7µH
+
4.7µF
M2
Si4412DY
D1
MBRS140T3
1000pF
Figure 1. High Efficiency Step-Down Converter
U
U
U
V
OUT
1.6V/3A
R1
35.7k
R2
102k
+
C
OUT
100µF
6.3V
×
2
1435A F01
1
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