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LTC1909-8 PDF预览

LTC1909-8

更新时间： 2023-12-20 18:44:43
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
32页 643K
描述
具 SMBus 编程功能的宽工作范围、No RSENSETM 降压型 DC/DC 控制器

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中文翻译

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LTC1909-8 数据手册

 浏览型号LTC1909-8的Datasheet PDF文件第2页浏览型号LTC1909-8的Datasheet PDF文件第3页浏览型号LTC1909-8的Datasheet PDF文件第4页浏览型号LTC1909-8的Datasheet PDF文件第5页浏览型号LTC1909-8的Datasheet PDF文件第6页浏览型号LTC1909-8的Datasheet PDF文件第7页 
LTC1909-8  
Wide Operating Range,  
No RSENSETM Step-Down DC/DC  
Controller with SMBus Programming  
U
FEATURES  
DESCRIPTIO  
The LTC®1909-8 is a synchronous step-down switching  
regulator controller with a digitally programmable output  
voltage. The output voltage is selected from one of two  
5-bit settings programmed into internal registers via a  
2-wire SMBus/I2C interface. The interface features safe-  
guards against invalid output voltages and allows the mi-  
croprocessor to turn the regulator on and off. Valley cur-  
rentcontroldeliversverylowdutycycleswithoutrequiring  
SMBus/I2CTM Programmable Output Voltage:  
■
1.3V to 3.5V  
■
No Sense Resistor Required  
■
■
■
■
■
■
■
2% to 90% Duty Cycle at 200kHz  
t
ON(MIN) ≤ 100ns  
True Current Mode Control  
Stable with Ceramic COUT  
Power Good Output Voltage Monitor and 50µs Timer  
Wide VIN Range: 4V to 36V (Abs Max)  
Precision Resistor Divider and Reference Provide  
±1.35% Output Voltage Accuracy Over Temperature  
Adjustable Switching Frequency and Current Limit  
Forced Continuous Control Pin  
a sense resistor. Operating frequency is selected by an  
external resistor and is compensated for variations in VIN  
and VOUT  
.
■
■
■
■
■
■
Discontinuous mode operation provides high efficiency  
operation at light loads. A forced continuous control pin  
reduces noise and RF interference and can assist second-  
ary winding regulation by disabling discontinuous mode  
operation when the main output is lightly loaded.  
Programmable Soft-Start  
Output Overvoltage Protection  
Optional Short-Circuit Shutdown Timer  
Available in a 28-Lead SSOP Package  
U
Fault protection is provided by internal foldback current  
limiting, an output overvoltage comparator and optional  
short-circuit shutdown timer.  
APPLICATIO S  
■
Power Supplies for DSPs, ASICs, FPGAs and CPUs  
The LTC1909-8 is available in the 28-lead SSOP package.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
No RSENSE is a trademark of Linear Technology Corporation.  
I2C is a trademark of Philips Electronics N.V.  
■
Voltage Margining  
U
TYPICAL APPLICATIO  
V
IN  
0.1µF  
5V TO 24V  
C
IN  
LTC1909-8  
100k  
100k  
CMDSH-3  
0.22µF  
10µF  
50V  
×4  
1
2
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
RUN/SS BOOST  
100k  
GND  
M1  
M2  
V
TG  
ON  
L1  
3
V
OUT  
11k  
39k  
1.8µH  
PGOOD  
SW  
+
2.5V OR 2.6V  
10A  
4
V
SENSE  
RNG  
(V  
SET BY SEL)  
OUT  
5
100pF  
FCB  
PGND  
BG  
6
C
C
OUT3  
I
TH  
OUT1, 2  
+
180µF  
4V  
22µF  
6.3V  
X7R  
7
470pF  
SGND  
INTV  
CC  
1Ω  
20k  
8
×2  
+
ION  
V
IN  
CC  
CC  
4.7µF  
6.3V  
D1  
9
5V  
EXT  
V
FB  
EXTV  
V
0.1µF  
10  
11  
12  
13  
14  
SEL  
SDA  
SEL  
GND  
: UNITED CHEMICON THCR60E1H106TZ  
: CORNELL DUBILIER ESRE181ME04B/  
PANASONIC EEFVEOG181R  
D1: DIODES INC. B340A  
L1: SUMIDA CEP125-1R8MC-H  
M1: Si4884  
R
ON  
SDA  
GND  
FB  
C
C
IN  
OUT1, 2  
1.4M 1%  
SCL  
SCL  
VRON  
PGTMR  
V
OSENSE  
VRON  
19098 F01  
CPUON  
M2: Si4874  
Figure 1. High Efficiency Step-Down Converter  
19098f  
1
1234567...32

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