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LTC1735-1 Datasheet(PDF) 1 Page - Linear Technology

Part No. LTC1735-1
Description  High Efficiency Synchronous Step-Down Switching Regulator
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1735-1 Datasheet(HTML) 1 Page - Linear Technology

 
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1
LTC1735-1
High Efficiency
Synchronous Step-Down
Switching Regulator
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
Dual N-Channel MOSFET Synchronous Drive
s
Programmable/Synchronizable Fixed Frequency
s
VOUT Range: 0.8V to 7V
s
Wide VIN Range: 3.5V to 36V Operation
s
Very Low Dropout Operation: 99% Duty Cycle
s
OPTI-LOOP
TM Compensation Minimizes COUT
s
±1% Output Voltage Accuracy
s
Power Good Output Voltage Monitor
s
Internal Current Foldback
s
Output Overvoltage Crowbar Protection
s
Latched Short-Circuit Shutdown Timer
with Defeat Option
s
Optional Programmable Soft-Start
s
Remote Output Voltage Sense
s
Logic Controlled Micropower Shutdown: IQ < 25µA
s
Available in 16-Lead Narrow SSOP and SO Packages
Figure 1. CPU Core DC/DC Converter with Dynamic Voltage Selection from SpeedStep Enabled Processors
, 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.
s
Notebook and Palmtop Computers, PDAs
s
Power Supply for Mobile Pentium
® III Processor with
SpeedStep
TM Technology
s
Cellular Telephones and Wireless Modems
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16
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12
11
10
9
COSC
RUN/SS
ITH
PGOOD
SENSE
SENSE +
VOSENSE
SGND
TG
BOOST
SW
VIN
INTVCC
BG
PGND
EXTVCC
LTC1735-1
1000pF
CC2 330pF
COSC 47pF
47pF
CC1 47pF
CSS 0.1µF
RC1 33k
+
4.7
µF
5V
(OPTIONAL)
47pF
Q4
2N7002
GND
47pF
R1
10k
0.5%
CIN: MARCON THCR70E1H226ZT
COUT: PANASONIC EEFUE06181R
L1: PANASONIC ETQP6RZ1R20HFA
RSENSE: IRC CRF2010-01-R004J
VOUT
1.35V TO 1.60V
12A
VSEL = 1: VOUT = 1.60V
VSEL = 0: VOUT = 1.35V
D1
CMDSH-3
D2
MBRS340T3
CB 0.22µF
Q1
FDS6680A
CIN
22
µF
50V
CERAMIC
×2
L1
1.2
µH
RSENSE
0.004
VIN
4.5V TO 24V
PGOOD
Q2, Q3
FDS6680A
×2
10
1735-1 F01
R3
33.2k
1%
R2
14.3k
0.5%
10
+
COUT
180
µF
4V
PANASONIC SP
×4
DESCRIPTIO
FEATURES
APPLICATIO S
TYPICAL APPLICATIO


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