參數(shù)資料
型號： LTC1873
廠商： Linear Technology Corporation
英文描述： Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID(550kHz,雙 路,同步2相開關(guān)穩(wěn)壓器(帶5位VID))
中文描述： 雙550kHz的同步二相開關(guān)5位VID（550kHz的，雙路，同步二相開關(guān)穩(wěn)壓器（帶5位vid等）穩(wěn)壓控制器）
文件頁數(shù)： 1/32頁
文件大小： 314K
代理商： LTC1873
1
LTC1873
Dual 550kHz Synchronous
2-Phase Switching Regulator
Controller with 5-Bit VID
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 100
μ
A.
I
Two Independent PWM Controllers in One Package
I
Side 1 Output Is Compliant with Intel
Desktop
VRM 8.4 Specifications (Includes 5-Bit VID DAC)
I
1.3V to 3.5V Output Voltage with 50mV/100mV Steps
I
Two Sides Run Out-of-Phase to Minimize C
IN
I
All N-Channel External MOSFET Architecture
I
No External Current Sense Resistors Required
I
Precison Internal 0.8V
±
1% Reference
I
550kHz Switching Frequency Minimizes External
Component Size
I
Very Fast Transient Response
I
Up to 25A Output Current per Channel
I
Low Shutdown Current: < 100
μ
A
I
Small 28-Pin SSOP Package
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
I
Microprocessor Core and I/O Supplies
I
Multiple Logic Supply Generator
I
High Efficiency Power Conversion
I
Chipset Power Supply
Low Cost Desktop CPU Supply with RDRAM Keepalive
+
FB2
COMP2
RUN/SS2
RUN/SS1
FB1
COMP1
FCB
VID4:0
SGND
BOOST2
TG2
SW2
BG2
I
MAX2
FAULT
V
CC
PV
CC
PGND
LTC1873
4.75k
0.1%
0.1
μ
F
39pF
56pF
220pF
330pF
56k
QSS2
QSS1
C
IN
= SANYO 10MV1200GX (6 IN PARALLEL)
C
OUT1
= SANYO 6MV1500GX (8 IN PARALLEL)
C
= SANYO 6MV1500GX (3 IN PARALLEL)
L1: 1
μ
H SUMIDA CEP125-1R0MC-H
L2: 2.2
μ
H COILTRONICS UP2B-2R2
QSS1, QSS2: MOTOROLA MMBT3904LT1
QT1A, QT1B, QB1A, QB1B: FAIRCHILD FDS6670A
QT2, QB2: 1/2 SILICONIX Si4966
4.5V TO 5.5V
STBY/ON
5-BIT VID
1k
68k
1k
10k
0.1%
47k
QT2
MBR0530T
1
μ
F
QB2
QT1A
QT1B
MBR0530T
1
μ
F
C
OUT1
1873 TA01
+
C
OUT2
+
10
μ
F
+
C
IN
1
μ
F
16.9k
0.1%
16.2k
0.1%
V
2.5V/7A
2.45V/100mA STANDBY
V
1.3V TO 3.5V
20A
10
L1
QB1A
QB1B
33k
BOOST1
TG1
SW1
BG1
I
MAX1
L2
IN
OUT
GND
LT1761
ADJ
SENSE
DESCRIPTIOU
FEATURES
APPLICATIU
TYPICAL APPLICATIO
U
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參數(shù)描述
LTC1873EG 功能描述:IC REG CTRLR BUCK PWM VM 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1873EG#PBF 功能描述:IC REG CTRLR BUCK PWM VM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1873EG#TR 功能描述:IC REG CTRLR BUCK PWM VM 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1873EG#TRPBF 功能描述:IC REG CTRLR BUCK PWM VM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
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