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LTC1735-1 PDF预览

LTC1735-1

更新时间： 2023-12-20 18:44:30
品牌 Logo 应用领域
亚德诺 - ADI 开关稳压器
页数 文件大小 规格书
28页 348K
描述
高效率同步降压型开关稳压器

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中文翻译

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LTC1735-1 数据手册

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LTC1735-1  
High Efficiency  
Synchronous Step-Down  
Switching Regulator  
U
FEATURES  
DESCRIPTIO  
The LTC®1735-1 is a synchronous step-down switching  
regulatorcontrolleroptimizedforCPUpower. OPTI-LOOP  
compensation allows the transient response to be opti-  
mized over a wide range of output capacitance and ESR  
values.  
■
Dual N-Channel MOSFET Synchronous Drive  
■
Programmable/Synchronizable Fixed Frequency  
■
VOUT Range: 0.8V to 7V  
Wide VIN Range: 3.5V to 36V Operation  
■
■
Very Low Dropout Operation: 99% Duty Cycle  
OPTI-LOOPTM Compensation Minimizes COUT  
■
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.  
■
±
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: IQ < 25µA  
■
■
■
■
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 ModeTM operation provides high  
efficiency at low load currents while 99% duty cycle  
provides low dropout operation.  
Available in 16-LUead Narrow SSOP and SO Packages  
APPLICATIO S  
■
Notebook and Palmtop Computers, PDAs  
Power Supply for Mobile Pentium® III Processor with  
■
SpeedStepTM 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.  
U
TYPICAL APPLICATIO  
PGOOD  
V
IN  
4.5V TO 24V  
C
C
: MARCON THCR70E1H226ZT  
: PANASONIC EEFUE06181R  
C
22µF  
50V  
CERAMIC  
×2  
IN  
OUT  
IN  
L1: PANASONIC ETQP6RZ1R20HFA  
C
47pF  
1
2
3
4
5
6
7
8
OSC  
16  
15  
14  
13  
12  
11  
10  
9
Q1  
FDS6680A  
C
TG  
R
: IRC CRF2010-01-R004J  
OSC  
SENSE  
C
0.22µF  
C
0.1µF  
B
SS  
RUN/SS  
BOOST  
L1  
R
33k  
R
C1  
SENSE  
0.004Ω  
C
330pF  
C2  
1.2µH  
V
OUT  
I
LTC1735-1 SW  
TH  
C
C1  
47pF  
1.35V TO 1.60V  
12A  
D1  
PGOOD  
V
IN  
CMDSH-3  
D2  
R1  
–
SENSE  
SENSE  
INTV  
CC  
MBRS340T3  
10k  
0.5%  
+
47pF  
47pF  
1000pF  
C
OUT  
+
Q2, Q3  
FDS6680A  
×2  
47pF  
BG  
4.7µF  
+
180µF  
R3  
33.2k  
1%  
4V  
V
PGND  
OSENSE  
PANASONIC SP  
5V  
(OPTIONAL)  
SGND  
EXTV  
CC  
×4  
Q4  
2N7002  
V
V
= 1: V  
= 0: V  
= 1.60V  
= 1.35V  
SEL  
SEL  
OUT  
OUT  
10Ω  
10Ω  
R2  
14.3k  
0.5%  
GND  
1735-1 F01  
Figure 1. CPU Core DC/DC Converter with Dynamic Voltage Selection from SpeedStep Enabled Processors  
1
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