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參數(shù)資料
| 型號： | LTC3809EMS-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 |
| 文件大小： | 318K |
| 代理商： | LTC3809EMS-1 |
38091f
LTC3809-1
1
LTC3809-1
2.2
H
10
F
47
F
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
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode
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.
■
Programmable Output Voltage Tracking
■ No Current Sense Resistor Required
■ Constant Frequency Current Mode Operation for
Excellent Line and Load Transient Response
■ Wide VIN Range: 2.75V to 9.8V
■ Wide VOUT Range: 0.6V to VIN
■
0.6V
±1.5% Reference
■ Low Dropout Operation: 100% Duty Cycle
■ Selectable Burst Mode
/Pulse Skipping/Forced
Continuous Operation
■ Auxiliary Winding Regulation
■ Internal Soft-Start Circuitry
■
Selectable Maximum Peak Current Sense Threshold
■ Output Overvoltage Protection
■ Micropower Shutdown: IQ = 9A
■
Tiny Thermally Enhanced Leadless (3mm
× 3mm)
DFN or 10-lead MSOP Package
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
No RSENSE
TM, Low Input
Voltage, Synchronous DC/DC
Controller with Output Tracking
LTC3809-1
■ One- or Two-Cell Lithium-Ion Powered Devices
■ Notebook and Palmtop Computers, PDAs
■ Portable Instruments
■ Distributed DC Power Systems
The LTC
3809-1 is a synchronous step-down switching
regulator controller that drives external complementary
power MOSFETs using few external components. The
constant frequency current mode architecture with MOSFET
VDS sensing eliminates the need for a current sense
resistor and improves efficiency.
Optional Burst Mode operation provides high efficiency
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 interfer-
ence.
The LTC3809-1 allows either coincident or ratiometric
output voltage tracking. Switching frequency is fixed at
550kHz. Fault protection is provided by an overvoltage
comparator and a short-circuit current limit comparator.
The LTC3809-1 is available in the tiny footprint thermally
enhanced DFN package or 10-lead MSOP package.
High Efficiency, 550kHz Step-Down Converter
Efficiency and Power Loss vs Load Current
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3809EMSE | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 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) |
| LTC3809EMSE#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) |
| LTC3809EMSE#TR | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 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) |
| LTC3809EMSE#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) |
| LTC3809EMSE-1 | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 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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