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LTC1735CS-1#TR

Description
IC reg ctrlr buck pwm CM 16-soic
CategoryPower/power management    The power supply circuit   
File Size341KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric View All

LTC1735CS-1#TR Overview

IC reg ctrlr buck pwm CM 16-soic

LTC1735CS-1#TR Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
Parts packaging codeSOIC
package instructionSOP, SOP16,.25
Contacts16
Manufacturer packaging codeS
Reach Compliance Code_compli
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Maximum input voltage36 V
Minimum input voltage3.5 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G16
JESD-609 codee0
length9.906 mm
Humidity sensitivity level1
Number of functions1
Number of terminals16
Maximum operating temperature85 °C
Minimum operating temperature
Maximum output current3 A
Maximum output voltage7 V
Minimum output voltage0.8 V
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP16,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.752 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency335 kHz
technologyCMOS
Temperature levelOTHER
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3.899 mm
Base Number Matches1
FEATURES
s
s
s
s
s
s
s
s
s
s
s
LTC1735-1
High Efficiency
Synchronous Step-Down
Switching Regulator
DESCRIPTIO
The LTC
®
1735-1 is a synchronous step-down switching
regulator controller optimized for CPU power. OPTI-LOOP
compensation allows the transient response to be opti-
mized over a wide range of output capacitance and ESR
values.
The operating frequency (synchronizable up to 500kHz) is
set by an external capacitor allowing maximum flexibility
in optimizing efficiency. The output voltage is monitored
by a power good window comparator that indicates when
the output is within 7.5% of its programmed value, con-
forming to Intel Mobile CPU Specifications.
Protection features include internal foldback current lim-
iting, output overvoltage crowbar and optional short-
circuit shutdown. Soft-start is provided by an external
capacitor that 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).
Pin defeatable Burst Mode
TM
operation provides high
efficiency at low load currents while 99% duty cycle
provides low dropout operation.
s
s
s
s
Dual N-Channel MOSFET Synchronous Drive
Programmable/Synchronizable Fixed Frequency
V
OUT
Range: 0.8V to 7V
Wide V
IN
Range: 3.5V to 36V Operation
Very Low Dropout Operation: 99% Duty Cycle
OPTI-LOOP
TM
Compensation Minimizes C
OUT
±
1% Output Voltage Accuracy
Power Good Output Voltage Monitor
Internal Current Foldback
Output Overvoltage Crowbar Protection
Latched Short-Circuit Shutdown Timer
with Defeat Option
Optional Programmable Soft-Start
Remote Output Voltage Sense
Logic Controlled Micropower Shutdown: I
Q
< 25µA
Available in 16-Lead Narrow SSOP and SO Packages
APPLICATIO S
s
s
s
Notebook and Palmtop Computers, PDAs
Power Supply for Mobile Pentium
®
III Processor with
SpeedStep
TM
Technology
Cellular Telephones and Wireless Modems
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation. SpeedStep is a trademark of Intel
Corporation.
TYPICAL APPLICATIO
PGOOD
C
OSC
47pF
C
SS
0.1µF
C
C2
330pF
R
C1
33k
C
C1
47pF
1
2
3
4
5
47pF
1000pF 6
7
8
V
IN
4.5V TO 24V
C
OSC
RUN/SS
I
TH
TG
BOOST
SW
V
IN
INTV
CC
BG
PGND
EXTV
CC
10Ω
10Ω
16
15
14
13
12
11
10
9
5V
(OPTIONAL)
D1
CMDSH-3
C
B
0.22µF
Q1
FDS6680A
L1
1.2µH
D2
MBRS340T3
Q2, Q3
FDS6680A
×2
C
IN
22µF
50V
CERAMIC
×2
R
SENSE
0.004Ω
LTC1735-1
PGOOD
SENSE
SENSE
+
V
OSENSE
SGND
+
4.7µF
Figure 1. CPU Core DC/DC Converter with Dynamic Voltage Selection from SpeedStep Enabled Processors
U
U
U
C
IN
: MARCON THCR70E1H226ZT
C
OUT
: PANASONIC EEFUE06181R
L1: PANASONIC ETQP6RZ1R20HFA
R
SENSE
: IRC CRF2010-01-R004J
V
OUT
1.35V TO 1.60V
12A
C
OUT
180µF
4V
PANASONIC SP
×4
V
SEL
= 1: V
OUT
= 1.60V
V
SEL
= 0: V
OUT
= 1.35V
GND
1735-1 F01
47pF
R1
10k
0.5%
+
47pF
R2
14.3k
0.5%
R3
33.2k
1%
Q4
2N7002
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