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參數(shù)資料
| 型號： | LTC3809IMSE-1 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 1/24頁 |
| 文件大?。?/td> | 256K |
| 代理商： | LTC3809IMSE-1 |
LTC3809-1
1
38091fc
TYPICAL APPLICATION
DESCRIPTION
No RSENSETM, Low Input
Voltage, Synchronous DC/DC
Controller with Output Tracking
The LTC
3809-1 is a synchronous step-down switching
regulator controller that drives external complementary
power MOSFETs using few external components. The
constantfrequencycurrentmodearchitecturewithMOSFET
VDSsensingeliminatestheneedforacurrentsenseresistor
and improves efciency.
Optional Burst Mode operation provides high efciency
operation at light loads. 100% duty cycle provides low
dropout operation, extending operating time in battery-
powered systems. Burst Mode is inhibited when the MODE
pin is pulled low to reduce noise and RF interference.
The LTC3809-1 allows either coincident or ratiometric
output voltage tracking. Switching frequency is xed at
550kHz. Fault protection is provided by an overvoltage
comparator and a short-circuit current limit comparator.
The LTC3809-1 is available in tiny footprint thermally
enhanced DFN and 10-lead MSOP packages.
High Efciency, 550kHz Step-Down Converter
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst
is a registered trademark of Linear Technology Corporation. No RSENSE is a trademark of
Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents including 5481178, 5929620, 6580258, 6304066,
5847554, 6611131, 6498466. Other Patents pending.
FEATURES
APPLICATIONS
n 1- or 2-Cell Lithium-Ion Powered Devices
n Notebook and Palmtop Computers, PDAs
n Portable Instruments
n Distributed DC Power Systems
n Programmable Output Voltage Tracking
n No Current Sense Resistor Required
n Constant Frequency Current Mode Operation for
Excellent Line and Load Transient Response
n Wide VIN Range: 2.75V to 9.8V
n Wide VOUT Range: 0.6V to VIN
n 0.6V
±1.5% Reference
n Low Dropout Operation: 100% Duty Cycle
n Selectable Burst Mode
/Pulse-Skipping/Forced
Continuous Operation
n Auxiliary Winding Regulation
n Internal Soft-Start Circuitry
n Selectable Maximum Peak Current Sense Threshold
n Output Overvoltage Protection
n Micropower Shutdown: IQ = 9μA
n Tiny Thermally Enhanced Leadless (3mm
× 3mm)
DFN and 10-lead MSOP Packages
Efciency and Power Loss vs Load Current
LTC3809-1
2.2μH
10μF
47μF
38091 TA01
15k
59k
187k
470pF
GND
IPRG
MODE
RUN
SW
TG
BG
VIN
VFB
VIN
2.75V TO 9.8V
VOUT
2.5V
2A
ITH
LOAD CURRENT (mA)
EFFICIENCY
(%)
100
90
80
70
60
50
POWER
LOSS
(mW)
10k
1k
100
10
1
0.1
1
100
1k
10k
38091 TA02
10
VIN = 3.3V
VIN = 5V
VIN = 4.2V
FIGURE 8 CIRCUIT
VOUT = 2.5V
TYPICAL POWER
LOSS (VIN = 4.2V)
EFFICIENCY
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| LTC3809IMSE-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP 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: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) |
| LTC3809IMSE-1#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP 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: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) |
| LTC3810EG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 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:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)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 |
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