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LTC1873EG Datasheet

  • LTC1873EG

  • Dual 550kHz Synchronous 2-Phase Switching Regulator Controll...

  • 32頁

  • LINER

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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
鹵1%
Reference
550kHz Switching Frequency Minimizes External
Component Size
Very Fast Transient Response
Up to 25A Output Current per Channel
Low Shutdown Current: < 100碌A(chǔ)
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
廬
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 100碌A(chǔ).
, 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
+
10鈩?/div>
4.75k
0.1%
330pF
C
IN
MBR0530T
10碌F
V
CC
FB2
56pF
COMP2
1k
QSS1
STBY/ON
1k
QSS2
0.1碌F
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
1碌F
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: 1碌H SUMIDA CEP125-1R0MC-H
L2: 2.2碌H COILTRONICS UP2B-2R2
QSS1, QSS2: MOTOROLA MMBT3904LT1
QT1A, QT1B, QB1A, QB1B: FAIRCHILD FDS6670A
QT2, QB2: 1/2 SILICONIX Si4966
BOOST1
47k
QB2
QT2
1碌F
L2
16.9k
0.1%
V
RDRAM
2.5V/7A
2.45V/100mA STANDBY
C
OUT2
IN
1碌F
OUT
16.2k
0.1%
LT1761
GND ADJ
+
10k
0.1%
68k
LTC1873 FAULT
56k
U
+
+
1873 TA01
U
U
1

LTC1873EG 產(chǎn)品屬性

  • LTC1873

  • 47

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電壓模式

  • 2

  • 750kHz

  • 93%

  • 3 V ~ 7 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • -40°C ~ 85°C

  • 28-SSOP（0.209"，5.30mm 寬）

  • 管件

LTC1873EG相關(guān)型號PDF文件下載

  • 型號
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    廠商
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    Dual Micropower Comparator
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    DUAL MICROPOWER COMPARATOR
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    Dual Micropower Comparator
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    BANG-BANG Controller
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    BANG-BANG Controller
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    Window Comparator
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    Window Comparator
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    Window Comparator
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    2-Channel Differential Input 16-Bit No Latency DS ADC
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    2-Channel Differential Input 24-Bit No Latency DS ADC
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    2-Channel Differential Input 16-Bit No Latency DS ADC
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    Dual Precision Intrumentation Switched-Capacitor Building Bl...
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    Switched Capacitor Voltage Converter
    LINER
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    Switched Capacitor Voltage Converter
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  • 英文版
    Programmable Micropower Hex Translator/ Receiver/Driver
    LINER
  • 英文版
    Programmable Micropower Hex Translator/ Receiver/Driver
    LINER [Lin...
  • 英文版
    “Inductorless” 5V to + 5V Converter
    LINER
  • 英文版
    “Inductorless” 5V to + 5V Converter
    LINER [Lin...
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    Dual Micropower Chopper Stabilized Operational Amplifier wit...
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