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LTC1873

更新时间： 2024-09-27 22:55:51
品牌 Logo 应用领域
凌特 - Linear 稳压器开关控制器
页数 文件大小 规格书
32页 310K
描述
Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID

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中文翻译

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LTC1873 数据手册

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LTC1873  
Dual 550kHz Synchronous  
2-Phase Switching Regulator  
Controller with 5-Bit VID  
U
FEATURES  
DESCRIPTIO  
The LTC®1873 is a dual switching regulator controller opti-  
mized for high efficiency with low input voltages. It includes  
twocomplete,on-chip,independentswitchingregulatorcon-  
trollers. Each is designed to drive a pair of external  
N-channel MOSFETs in a voltage mode feedback, synchro-  
nous buck configuration. The LTC1873 includes digital out-  
put voltage adjustment on side 1 that conforms to the Intel  
Desktop VID specification. A constant-frequency, true PWM  
design minimizes external component size and cost and  
optimizesloadtransientperformance.Thesynchronousbuck  
architectureautomaticallyshiftstodiscontinuousandthento  
Burst ModeTM operation as the output load decreases, ensur-  
ing maximum efficiency over a wide range of load currents.  
■
Two Independent PWM Controllers in One Package  
■
Side 1 Output Is Compliant with IntelDesktop  
VRM 8.4 Specifications (Includes 5-Bit VID DAC)  
■
1.3V to 3.5V Output Voltage with 50mV/100mV Steps  
■
Two Sides Run Out-of-Phase to Minimize CIN  
■
All N-Channel External MOSFET Architecture  
■
No External Current Sense Resistors Required  
■
Precison Internal 0.8V ±1% Reference  
■
550kHz Switching Frequency Minimizes External  
Component Size  
■
Very Fast Transient Response  
■
Up to 25A Output Current per Channel  
■
Low Shutdown Current: < 100µA  
Small 28-Pin SSOP Package  
■
The LTC1873 features an onboard reference trimmed to 1%  
and delivers better than 1.5% regulation at the converter  
outputs over all combinations of line, load and temperature.  
Each channel can be enabled independently; with both chan-  
nels disabled, the LTC1873 shuts down and supply current  
drops below 100µA.  
U
APPLICATIO S  
■
Microprocessor Core and I/O Supplies  
■
Multiple Logic Supply Generator  
■
High Efficiency Power Conversion  
Chipset Power Supply  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
■
U
TYPICAL APPLICATIO  
Low Cost Desktop CPU Supply with RDRAM Keepalive  
4.5V TO 5.5V  
IN OUT  
LT1761  
+
1µF  
10Ω  
C
IN  
16.2k  
0.1%  
GND ADJ  
MBR0530T  
+
4.75k  
0.1%  
10µF  
10k  
V
PV  
CC  
CC  
0.1%  
16.9k  
0.1%  
FB2  
BOOST2  
TG2  
330pF  
56pF  
68k  
QT2  
1µF  
L2  
V
COMP2  
RDRAM  
2.5V/7A  
SW2  
+
2.45V/100mA STANDBY  
RUN/SS2  
RUN/SS1  
QB2  
BG2  
1k  
1k  
C
OUT2  
47k  
QSS1  
I
MAX2  
0.1µF  
STBY/ON  
QSS2  
FAULT  
MBR0530T  
1µF  
LTC1873  
BOOST1  
SENSE  
FB1  
QT1B  
QB1B  
220pF  
TG1  
SW1  
BG1  
QT1A  
QB1A  
L1  
39pF  
56k  
V
CORE  
COMP1  
FCB  
1.3V TO 3.5V  
20A  
+
C
OUT1  
C
C
C
= SANYO 10MV1200GX (6 IN PARALLEL)  
IN  
= SANYO 6MV1500GX (8 IN PARALLEL)  
= SANYO 6MV1500GX (3 IN PARALLEL)  
OUT1  
OUT2  
33k  
5-BIT VID  
VID4:0  
SGND  
I
MAX1  
L1: 1µH SUMIDA CEP125-1R0MC-H  
L2: 2.2µH COILTRONICS UP2B-2R2  
QSS1, QSS2: MOTOROLA MMBT3904LT1  
QT1A, QT1B, QB1A, QB1B: FAIRCHILD FDS6670A  
QT2, QB2: 1/2 SILICONIX Si4966  
PGND  
1873 TA01  
1
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中文翻译

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