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| 型号： | LTC1779ES6#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.25A SOT23-6 |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 9.8 V |
| 输入电压： | 2.5 V ~ 9.8 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 100kHz ~ 550kHz |
| 电流 - 输出： | 250mA |
| 同步整流器： | 无 |
| 工作温度： | -65°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SOT-23-6 |
| 其它名称： | LTC1779ES6TR |
LTC1779
250mA Current Mode
Step-Down DC/DC Converter
in ThinSOT
FEATURES
DESCRIPTIO
s
s
s
s
s
s
s
s
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s
High Efficiency: Up to 94%
250mA Output Current
Wide V IN Range: 2.5V to 9.8V
550kHz Constant Frequency Operation
Burst Mode TM Operation at Light Load
Low Dropout: 100% Duty Cycle
0.8V Reference Allows Low Output Voltages
± 2.5% Reference Accuracy
Current Mode Operation for Excellent Line and Load
Transient Response
Low Quiescent Current: 135 μ A
Shutdown Mode Draws Only 8 μ A Supply Current
Low Profile (1mm) ThinSOT TM Package
The LTC ? 1779 is a constant frequency current mode step-
down DC/DC converter in a 6-lead ThinSOT 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.
APPLICATIO S
To further maximize the life of a battery source, the
internal P-channel MOSFET is turned on continuously in
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1- or 2-Cell Lithium-Ion-Powered Applications
Cellular Telephones
Wireless Modems
Portable Computers
Distributed 3.3V, 2.5V or 1.8V Power Systems
Scanners
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 low profile (1mm) ThinSOT
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and ThinSOT are trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
V IN
Efficiency vs Load Current
0.1 μ F
20k
100pF
1
2
3
I TH /RUN SW
LTC1779
GND V IN
V FB SENSE –
6
5
4
R1
10 ?
C3
D1
L1
22 μ H
+
C1
10 μ F
16V
C2
47 μ F
6V
169k
78.7k
2.5V
TO 9.8V
V OUT
2.5V
100mA
100
90
80
70
60
V IN = 3.3V
V IN = 6V
V IN = 9.8V
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
1779 F01a
50
C2: SANYO POSCAP 6TPA47M
D1: IR10BQ015
L1: COILTRONICS UP1B220
40
30
V OUT = 2.5V
R SENSE = 10 ?
0.1
1
10 100
1000
LOAD CURRENT (mA)
Figure 1. LTC1779 High Efficiency 2.5V/100mA Step-Down Converter
1779 F01b
1
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