參數(shù)資料
型號(hào)： LTC3772EDDB#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, PLASTIC, MO-229-WECD, DFN-8
文件頁(yè)數(shù)： 1/20頁(yè)
文件大?。?/td> 248K
代理商： LTC3772EDDB#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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參數(shù)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
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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 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(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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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