參數(shù)資料
型號： LTC3801B
廠商： Linear Technology Corporation
英文描述： Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT
中文描述： 微恒頻降壓DC / DC控制器的采用ThinSOT
文件頁數(shù)： 1/12頁
文件大小： 247K
代理商： LTC3801B
1
LTC3801/LTC3801B
Micropower
3801f
Constant Frequency Step-Down
DC/DC Controllers in ThinSOT
DESCRIPTIOU
I
High Efficiency: Up to 94%
I
Very Low No-Load Quiescent Current:
Only 16
μ
A (LTC3801)
I
High Output Currents Easily Achieved
I
Internal Soft-Start
I
Wide V
IN
Range: 2.4V to 9.8V
I
Low Dropout: 100% Duty Cycle
I
Constant Frequency 550kHz Operation
I
Burst Mode
Operation for High Efficiency
at Light Loads (LTC3801)
I
Burst Mode Operation Disabled for Lower Output
Ripple at Light Loads (LTC3801B)
I
Output Voltage as Low as 0.8V
I
±
1.5% Voltage Reference Accuracy
I
Current Mode Operation for Excellent Line and Load
Transient Response
I
Only 6
μ
A Supply Current in Shutdown (LTC3801)
I
Low Profile (1mm) SOT-23 Package
APPLICATIU
I
1- or 2-Cell Li-Ion Battery-Powered Applications
I
Wireless Devices
I
Portable Computers
I
Distributed Power Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
550kHz Micropower Step-Down DC/DC Controller
The LTC
3801/LTC3801B are constant frequency cur-
rent mode step-down DC/DC controllers in a low profile
(1mm max) 6-lead SOT-23 (ThinSOT
TM
)
package. The
parts provide excellent AC and DC load and line regula-
tion with
±
1.5% output voltage accuracy. The LTC3801
consumes only 195
μ
A of quiescent current in normal
operation, dropping to 16
μ
A under no-load conditions.
The LTC3801
/LTC3801B
incorporate an undervoltage lock-
out feature that shuts down the device when the input
voltage falls below 2.2V. The LTC3801 automatically
switches into Burst Mode operation at light loads which
enhances efficiency at low output current. In the LTC3801B,
Burst Mode operation is disabled for lower output ripple at
light loads.
To further maximize the life of a battery source, the
external P-channel MOSFET is turned on continuously in
dropout (100% duty cycle). High switching frequency of
550kHz allows the use of a small inductor.
I
TH
/RUN
LTC3801/
LTC3801B
GND
10k
402k
866k
0.025
4.7
μ
H
220pF
V
FB
3801 TA01
PGATE
V
IN
SENSE
–
10
μ
F
V
2.7V TO 9.8V
V
2.5V
2A
47
μ
F
+
LTC3801 Efficiency vs Load Current*
100
V
OUT
= 2.5V
V
IN
= 4.2V
LOAD CURRENT (mA)
0.1
70
E
75
80
85
90
1
10
100
10000
1000
3801 TA02
65
60
55
50
95
V
IN
= 3.3V
V
IN
= 6.6V
V
IN
= 8.4V
V
IN
= 9.8V
FEATURES
TYPICAL APPLICATIO
U
*SEE NO-LOAD I
Q
vs INPUT VOLTAGE ON THE LAST PAGE OF THIS DATA SHEET
相關(guān)PDF資料
PDF描述
LTC3801BES6 Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3801BES6#PBF 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Down 2.4V to 9.8V Input 6-Pin TSOT-23
LTC3801BES6#TR 功能描述:IC REG CTRLR BUCK PWM TSOT23-6 RoHS:否 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)
LTC3801BES6#TRM 功能描述:IC REG CTRLR BUCK PWM TSOT23-6 RoHS:否 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)
LTC3801BES6#TRMPBF 功能描述:IC REG CTRLR BUCK PWM TSOT23-6 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)
LTC3801BES6#TRPBF 功能描述:IC REG CTRLR BUCK PWM TSOT23-6 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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