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參數(shù)資料
| 型號(hào)： | LTC1779 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 250mA Low Dropout Current Mode Step-Down DC/DC Converter in SOT-23(2.5V輸出,250mA電流模式，低壓差,步降DC/DC變換器（SOT-23封裝）) |
| 中文描述： | 250mA的低壓差電流模式降壓DC / DC轉(zhuǎn)換器采用SOT - 23（2.5V的輸出，250mA的電流模式，低壓差，步降直流/直流變換器（采用SOT - 23封裝）） |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 174K |
| 代理商： | LTC1779 |
1
LTC1779
250mA Current Mode
Step-Down DC/DC Converter
in SOT-23
October 2000
The LTC
1779 is a constant frequency current mode step-
down DC/DC converter in a 6-lead SOT-23 package. The
part operates with a 2.5V to 9.8V input and can provide up
to 250mA of output current. Current mode control pro-
vides excellent AC and DC load and line regulation. The
device incorporates an accurate undervoltage lockout fea-
ture that shuts down the LTC1779 when the input voltage
falls below 2V.
The LTC1779 boasts a
±
2.5% output voltage accuracy and
consumes only 135
μ
A of quiescent current. For applica-
tions where efficiency is a prime consideration, the LTC1779
is configured for Burst Mode operation, which enhances
efficiency at low output current.
To further maximize the life of a battery source, the
internal 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 LTC1779 is available in a small footprint 6-lead
SOT-23.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
Figure 1. LTC1779 High Efficiency 2.5V/100mA Step-Down Converter
I
1- or 2-Cell 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
250mA Output Current
I
Wide V
IN
Range: 2.5V to 9.8V
I
550kHz Constant Frequency Operation
I
Burst Mode
TM
Operation at Light Load
I
Low Dropout: 100% Duty Cycle
I
0.8V Reference Allows Low Output Voltages
I
±
2.5% Reference Accuracy
I
Current Mode Operation for Excellent Line and Load
Transient Response
I
Low Quiescent Current: 135
μ
A
I
Shutdown Mode Draws Only 8
μ
A Supply Current
I
Tiny 6-Lead SOT-23 Package
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
Efficiency vs Load Current
I
TH
/RUN
LTC1779
GND
20k
169k
78.7k
R1
10
L1
22
μ
H
D1
100pF
V
FB
6
5
4
1779 F01a
1
2
3
SW
V
IN
SENSE
–
C1
10
μ
F
16V
C3
0.1
μ
F
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: SANYO POSCAP 6TPA47M
D1: IR10BQ015
L1: COILTRONICS UP1B220
V
2.5V
TO 9.8V
V
2.5V
100mA
C2
47
μ
F
6V
+
FEATURES
DESCRIPTIOU
APPLICATIU
TYPICAL APPLICATIO
U
LOAD CURRENT (mA)
50
E
70
90
100
0.1
10
100
1000
1779 F01b
30
1
80
60
40
V
IN
= 3.3V
V
IN
= 6V
V
IN
= 9.8V
V
OUT
= 2.5V
R
SENSE
= 10
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LTC1779ES6#TRM | 功能描述:IC REG BUCK ADJ 0.25A SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
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