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参数资料
| 型号： | LTC3772ETS8#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 1 MM HEIGHT, PLASTIC, MO-193, SOT-23, 8 PIN |
| 文件页数： | 1/20页 |
| 文件大小： | 248K |
| 代理商： | LTC3772ETS8#PBF |
1
LTC3772
3772f
■ No Current Sense Resistor Required
■ 40A No-Load Quiescent Current
■ High Output Currents Easily Achieved
■ Internal Soft-Start Ramps VOUT
■ Wide VIN Range: 2.75V to 9.8V
■ Low Dropout: 100% Duty Cycle
■ Constant Frequency 550kHz Operation
■ Low Ripple Burst Mode
Operation at Light Load
■ Output Voltage as Low as 0.8V
■ ±1.5% Voltage Reference Accuracy
■ Current Mode Operation for Excellent Line and Load
Transient Response
■ Only 8A Supply Current in Shutdown
■ Low Profile 8-Lead SOT-23 (1mm) and
(3mm × 2mm) DFN (0.75mm) Packages
■ 1- or 2-Cell Li-Ion Battery-Powered Applications
■
Wireless Devices
■ Portable Computers
■ Distributed Power Systems
550kHz Micropower Step-Down DC/DC Converter
The LTC
3772 is a constant frequency current mode
step-down DC/DC controller in a low profile 8-lead SOT-23
(ThinSOT
TM) and a 3mm × 2mm DFN package. The No
RSENSE
TM architecture eliminates the need for a current
sense resistor, improving efficiency and saving board
space.
The LTC3772 automatically switches into Burst Mode
operation at light loads to increase efficiency at low output
current. It consumes only 40A of quiescent current
under a no-load condition.
The LTC3772 incorporates an undervoltage lockout fea-
ture that shuts down the device when the input voltage
falls below 2V. To maximize the runtime from a battery
source, the external P-channel MOSFET is turned on
continuously in dropout (100% duty cycle). High switch-
ing frequency of 550kHz allows the use of a small inductor
and capacitors. An internal soft-start smoothly ramps the
output voltage from zero to its regulation point.
ITH/RUN
LTC3772
20k
82.5k
174k
22pF
680pF
GND
VFB
3772 TA01
SW
VIN
PGATE
10F
3.3H
VIN
2.75V TO 9.8V
VOUT
2.5V
2A
47F
Efficiency and Power Loss vs Load Current
LOAD CURRENT (mA)
60
EFFICIENCY
(%)
POWER
LOSS
(W)
80
100
50
70
90
1
100
1000
10000
3772 TA01b
40
0.01
1
10
0.1
0.001
10
VIN = 3.3V
FIGURE 5 CIRCUIT
VIN = 5V
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
Micropower No RSENSE
Constant Frequency Step-Down
DC/DC Controller
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT and No RSENSE are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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相关代理商/技术参数 |
参数描述 |
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| LTC3773EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3773EUHF | 制造商:Linear Technology 功能描述:DC DC Cntrlr Triple-OUT Sync Step Down 3.3V to 36V Input 38-Pin QFN EP |
| LTC3773EUHF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3773EUHF#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
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