參數(shù)資料
型號(hào)： LTC3772BEDDB#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 1 A SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 3 X 2 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-8
文件頁(yè)數(shù)： 1/20頁(yè)
文件大?。?/td> 318K
代理商： LTC3772BEDDB#PBF
1
LTC3772B
3772bfa
■ No Current Sense Resistor Required
■ 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 Pulse Skipping 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
A 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
3772B 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 LTC3772B automatically switches into pulse skipping
operation at light loads. It consumes only 200
A of quies-
cent current under a no-load condition.
The LTC3772B 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
LTC3772B
20k
82.5k
174k
22pF
680pF
GND
VFB
3772B TA01
SW
VIN
PGATE
10
F
3.3
H
VIN
2.75V TO 9.8V
VOUT
2.5V
2A
47
F
Efficiency and Power Loss vs Load Current
(Figure 5 Circuit)
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
Micropower No RSENSE
Constant Frequency Step-Down
DC/DC Controller
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
ThinSOT and No RSENSE are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by
U.S. Patents including 5731694, 6127815.
LOAD CURRENT (mA)
30
EFFICIENCY
(%)
POWER
LOSS
(W)
90
100
20
10
80
50
70
60
40
1
100
1000
10000
3772B TA01b
0
10
0.01
1
0.1
0.001
10
VIN = 3.3V
VIN = 5V
EFFICIENCY
POWER LOSS
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3772BETS8#TRMPBF 功能描述:IC REG CTRLR BUCK PWM TSOT23-8 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)
LTC3772BETS8#TRPBF 功能描述:IC REG CTRLR BUCK PWM TSOT23-8 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)
LTC3772EDDB#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 DFN EP
LTC3772EDDB#TRMPBF 功能描述:IC REG CTRLR BUCK PWM CM 8-DFN 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)
LTC3772EDDB#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 8-DFN 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)
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