參數(shù)資料
型號： LTC3850EUF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 0.1 A DUAL SWITCHING CONTROLLER, 860 kHz SWITCHING FREQ-MAX, PQCC28
封裝： 4 X 4 MM, PLASTIC, QFN-28
文件頁數(shù)： 1/32頁
文件大小： 474K
代理商： LTC3850EUF
LTC3850
1
3850f
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual, 2-Phase
Synchronous Step-Down
Switching Controller
The LTC3850 is a high performance dual synchronous
step-down switching regulator controller that drives all
N-channel power MOSFET stages. A constant-frequency
current mode architecture allows a phase-lockable fre-
quency of up to 780kHz. Power loss and supply noise are
minimized by operating the two controller output stages
out of phase.
OPTI-LOOP compensation allows the transient response
to be optimized over a wide range of output capacitance
and ESR values. The LTC3850 features a precision 0.8V
reference and a power good output indicator. A wide 4V
to 24V (28V maximum) input supply range encompasses
most battery chemistries and intermediate bus voltages.
Independent TK/SS pins for each controller ramp the
output voltages during start-up. Current foldback limits
MOSFET heat dissipation during short-circuit condi-
tions.The MODE/PLLIN pin selects among Burst Mode
operation, pulse-skipping mode, or continuous inductor
current mode and allows the IC to be synchronized to an
external clock.
The LTC3850 is available in both low prole 28-pin 4mm
× 4mm QFN and narrow SSOP packages.
High Efciency Dual 3.3V/2.5V Step-Down Converter
■
Dual, 180° Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
■
High Efciency: Up to 95%
■
RSENSE or DCR Current Sensing
■
±1% 0.8V Output Voltage Accuracy
■
Phase-Lockable Fixed Frequency 250kHz to 780kHz
■
Supports Pre-Biased Output
■
Dual N-Channel MOSFET Synchronous Drive
■
Wide VIN Range: 4V to 24V Operation
■
Adjustable Soft-Start Current Ramping or Tracking
■
Foldback Output Current Limiting
■
Output Overvoltage Protection
■
Power Good Output Voltage Monitor
■
28-Pin 4mm × 4mm QFN and Narrow SSOP Packages
■
Notebook and Palmtop Computers
■
Portable Instruments
■
Battery-Operated Digital Devices
■
DC Power Distribution Systems
, LT, LTC, LTM, Burst Mode and OPTI-LOOP are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6100678, 6144194,
6177787, 6304066, 6580258.
0.1
F
63.4k
2.2
H
2.2k
220pF
0.1
F
0.1
F
4.7
F
22
F
50V
100
F
6V
20k
15k
VOUT1
3.3V
5A
0.1
F
43.2k
2.2
H
220pF
10nF
100
F
6V
20k
15k
10k
VOUT2
2.5V
5A
TG1
TG2
BOOST1
BOOST2
SW1
SW2
BG1
BG2
SGND
PGND
FREQ/PLLFLTR
SENSE1+
SENSE2+
RUN2
SENSE1–
SENSE2–
VFB1
VFB2
ITH1
ITH2
VIN PGOOD INTVCC
TK/SS1
TK/SS2
VIN
7V TO
24V
3850 TA01
0.1
F
0.1
F
LTC3850
MODE/PLLIN
ILIM
RUN1
500kHz
2.2k
Efciency
LOAD CURRENT (mA)
10
70
EFFICIENCY
(%)
POWER
LOSS
(mW)
75
80
85
90
100
1000
10000
65
60
55
50
95
100
1000
10
10000
3850 TA01b
POWER LOSS
EFFICIENCY
VIN = 12V
VOUT = 3.3V
相關PDF資料
PDF描述
LTC3850EUF#TR 0.1 A DUAL SWITCHING CONTROLLER, 860 kHz SWITCHING FREQ-MAX, PQCC28
LTC3851AHMSE#PBF SWITCHING REGULATOR, PDSO16
LTC3851AMPMSE#PBF SWITCHING REGULATOR, PDSO16
LTC3851AIGN#TRPBF SWITCHING REGULATOR, PDSO16
LTC3851AHMSE#TRPBF SWITCHING REGULATOR, PDSO16
相關代理商/技術參數(shù)
參數(shù)描述
LTC3850EUF#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標準包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 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:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR
LTC3850EUF#PBF 制造商:Linear Technology 功能描述:IC SYNC STEP-DOWN CONTROLLER QFN-28
LTC3850EUF#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 28-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3850EUFD#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標準包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 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:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR
LTC3850EUFD#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 28-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
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