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參數(shù)資料
| 型號： | LTC1772 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23 |
| 中文描述： | 恒定頻率電流模式降壓DC / DC控制器，采用SOT - 23 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大小： | 188K |
| 代理商： | LTC1772 |
1
LTC1772
Constant Frequency
Current Mode Step-Down
DC/DC Controller in SOT-23
September 1999
FEATURES
DESCRIPTIO
N
U
The LTC
1772 is a constant frequency current mode step-
down DC/DC controller providing excellent AC and DC load
and line regulation. The device incorporates an accurate
undervoltage lockout feature that shuts down the LTC1772
when the input voltage falls below 2.0V.
The LTC1772 boasts a
±
2.5% output voltage accuracy and
consumes only 270
μ
A of quiescent current. For applica-
tions where efficiency is a prime consideration, the LTC1772
is configured for Burst Mode operation, which enhances
efficiency at low output current.
To further maximize the life of a battery source, the
external P-channel MOSFET is turned on continuously in
dropout (100% duty cycle). In shutdown, the device draws
a mere 8
μ
A. High constant operating frequency of 550kHz
allows the use of a small external inductor.
The LTC1772 is available in a small footprint 6-lead
SOT-23.
Figure 1. High Efficiency Step-Down Converter
APPLICATIO
S
U
I
One or Two Lithium-Ion-Powered Applications
I
Cellular Telephones
I
Wireless Modems
I
Portable Computers
I
Distributed 3.3V, 2.5V or 1.8V Power Systems
I
Scanners
I
High Efficiency: Up to 94%
I
High Output Currents Easily Achieved
I
Wide V
IN
Range: 2.5V to 9.8V
I
Constant Frequency 550kHz Operation
I
Burst Mode
TM
Operation at Light Load
I
Low Dropout: 100% Duty Cycle
I
0.8V Reference Allows Low Output Voltages
I
Current Mode Operation for Excellent Line and Load
Transient Response
I
Low Quiescent Current: 270
μ
A
I
Shutdown Mode Draws Only 8
μ
A Supply Current
I
±
2.5% Reference Accuracy
I
Tiny 6-Lead SOT-23 Package
TYPICAL APPLICATIO
N
U
Efficiency vs Load Current
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
I
TH
/RUN
LTC1772
10k
R1
0.03
169k
78.7k
L1
4.7
μ
H
M1
D1
220pF
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: SANYO POSCAP 6TPA47M
D1: IR10BQ015
L1: MURATA LQN6C-4R7
M1: Si3443DV
R1: DALE 0.25W
GND
V
FB
6
5
4
1772 F01a
1
2
3
PGATE
V
IN
SENSE
–
C1
10
μ
F
16V
V
2.5V
TO 9.8V
V
2.5V
2A
C2
47
μ
F
6V
+
LOAD CURRENT (mA)
60
E
80
100
50
70
90
1
100
1000
10000
1772 F01b
40
10
V
IN
= 3.3V
V
IN
= 4.2V
V
IN
= 8.4V
V
OUT
= 2.5V
R
SENSE
= 0.03
V
IN
= 9.8V
V
IN
= 6V
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Final Electrical Specifications
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1772BES6 | 制造商:Linear Technology 功能描述:IC CTRLR DC/DC S-DWN SOT23-6 |
| LTC1772BES6#PBF | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Down 2.5V to 9.8V Input 6-Pin TSOT-23 制造商:Linear Technology 功能描述:DC-DC CONTROLLER BUCK 5A TS 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, BUCK, 5A, TSOT-23-6; Primary Input Voltage:9.8V; No. of Outputs:1; Output Current:5A; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:6-TSOT-23; Supply Voltage Max:9.8V;RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, BUCK, 5A, TSOT-23-6; Primary Input Voltage:9.8V; No. of Outputs:1; Output Current:5A; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:6-TSOT-23 ;RoHS Compliant: Yes |
| LTC1772BES6#TR | 功能描述:IC REG CTRLR BUCK PWM CM SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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) |
| LTC1772BES6#TRM | 功能描述:IC REG CTRLR BUCK PWM CM SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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) |
| LTC1772BES6#TRMPBF | 功能描述:IC REG CTRLR BUCK PWM CM SOT23-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標準包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
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