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参数资料
| 型号： | LTC3772EDDB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 8-DFN |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 650kHz |
| 占空比： | 100% |
| 电源电压： | 2.75 V ~ 9.8 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 ~ 85°C |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
LTC3772
Micropower No R SENSE
Constant Frequency Step-Down
DC/DC Controller
FEATURES
DESCRIPTIO
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No Current Sense Resistor Required
40 μ A No-Load Quiescent Current
High Output Currents Easily Achieved
Internal Soft-Start Ramps V OUT
Wide V IN 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 8 μ A Supply Current in Shutdown
Low Profile 8-Lead SOT-23 (1mm) and
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
R SENSE 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 40 μ A 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
(3mm × 2mm) DFN (0.75mm) Packages
APPLICATIO S
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
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1- or 2-Cell Li-Ion Battery-Powered Applications
Wireless Devices
Portable Computers
Distributed Power Systems
and capacitors. An internal soft-start smoothly ramps the
output voltage from zero to its regulation point.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT and No R SENSE are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
550kHz Micropower Step-Down DC/DC Converter
Efficiency and Power Loss vs Load Current
100
10
680pF
20k
I TH /RUN
LTC3772
V IN
10 μ F
V IN
2.75V TO 9.8V
90
V IN = 3.3V
V IN = 5V
1
GND
PGATE
80
82.5k
V FB
SW
3.3 μ H
47 μ F
V OUT
2.5V
2A
70
60
V IN = 5V
V IN = 3.3V
0.1
22pF
174k
3772 TA01
50
0.01
40
FIGURE 5 CIRCUIT
0.001
1
10
100 1000
10000
LOAD CURRENT (mA)
3772 TA01b
3772f
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3772ETS8 | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Down 2.75V to 9.8V Input 8-Pin TSOT-23 |
| LTC3772ETS8#PBF | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Down 2.75V to 9.8V Input 8-Pin TSOT-23 |
| LTC3772ETS8#TR | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Down 2.75V to 9.8V Input 8-Pin TSOT-23 T/R |
| LTC3772ETS8#TRM | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Down 2.75V to 9.8V Input 8-Pin TSOT-23 T/R |
| LTC3772ETS8#TRMPBF | 功能描述:IC REG CTRLR BUCK PWM TSOT23-8 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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