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LTC1873EG

Description
Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID
CategoryPower/power management    The power supply circuit   
File Size318KB,32 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LTC1873EG Overview

Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID

LTC1873EG Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeSSOP
package instructionSSOP, SSOP28,.3
Contacts28
Manufacturer packaging codeG
Reach Compliance Code_compli
ECCN codeEAR99
Is SamacsysN
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeVOLTAGE-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage7 V
Minimum input voltage3 V
Nominal input voltage5 V
JESD-30 codeR-PDSO-G28
JESD-609 codee0
length10.2 mm
Humidity sensitivity level1
Number of functions2
Number of terminals28
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current5 A
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Encapsulate equivalent codeSSOP28,.3
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height2 mm
surface mountYES
Switch configurationPUSH-PULL
Maximum switching frequency750 kHz
technologyBICMOS
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width5.3 mm
Base Number Matches1
LTC1873
Dual 550kHz Synchronous
2-Phase Switching Regulator
Controller with 5-Bit VID
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
Two Independent PWM Controllers in One Package
Side 1 Output Is Compliant with Intel Desktop
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 C
IN
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
APPLICATIO S
s
s
s
s
Microprocessor Core and I/O Supplies
Multiple Logic Supply Generator
High Efficiency Power Conversion
Chipset Power Supply
The LTC
®
1873 is a dual switching regulator controller opti-
mized for high efficiency with low input voltages. It includes
two complete, on-chip, independent switching regulator con-
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
optimizes load transient performance. The synchronous buck
architecture automatically shifts to discontinuous and then to
Burst Mode
TM
operation as the output load decreases, ensur-
ing maximum efficiency over a wide range of load currents.
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
4.5V TO 5.5V
Low Cost Desktop CPU Supply with RDRAM Keepalive
+
10Ω
4.75k
0.1%
330pF
C
IN
MBR0530T
10µF
V
CC
FB2
56pF
COMP2
1k
QSS1
STBY/ON
1k
QSS2
0.1µF
SENSE
220pF
FB1
39pF
COMP1
FCB
5-BIT VID
VID4:0
SGND
RUN/SS2
RUN/SS1
PV
CC
BOOST2
TG2
SW2
BG2
I
MAX2
MBR0530T
QT1B
TG1
SW1
BG1
33k
I
MAX1
PGND
QB1B
QB1A
QT1A
1µF
L1
V
CORE
1.3V TO 3.5V
20A
C
OUT1
C
IN
= SANYO 10MV1200GX (6 IN PARALLEL)
C
OUT1
= SANYO 6MV1500GX (8 IN PARALLEL)
C
OUT2
= SANYO 6MV1500GX (3 IN PARALLEL)
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
BOOST1
47k
QB2
QT2
1µF
L2
16.9k
0.1%
V
RDRAM
2.5V/7A
2.45V/100mA STANDBY
C
OUT2
IN
1µF
OUT
16.2k
0.1%
LT1761
GND ADJ
+
10k
0.1%
68k
LTC1873 FAULT
56k
U
+
+
1873 TA01
U
U
1

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