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參數資料
| 型號： | LTC1779CS6 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | 0.5 A SWITCHING REGULATOR, 550 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | PLASTIC, SOT-23, 6 PIN |
| 文件頁數： | 1/12頁 |
| 文件大小： | 170K |
| 代理商： | LTC1779CS6 |
1
LTC1779
250mA Current Mode
Step-Down DC/DC Converter
in SOT-23
June 2000
The LTC
1779 is a constant frequency current mode step-
down DC/DC converter providing excellent AC and DC load
and line regulation. The device incorporates an accurate
undervoltage lockout feature that shuts down the LTC1779
when the input voltage falls below 2.0V.
The LTC1779 boasts a
±2.5%outputvoltageaccuracyand
consumes only 110
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
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.
Figure 1. LTC1779 High Efficiency 2.5V/100mA Step-Down Converter
s
One or Two Lithium-Ion-Powered Applications
s
Cellular Telephones
s
Wireless Modems
s
Portable Computers
s
Distributed 3.3V, 2.5V or 1.8V Power Systems
s
Scanners
s
High Efficiency: Up to 94%
s
250mA Output Current
s
Wide VIN Range: 2.5V to 9.8V
s
550kHz Constant Frequency Operation
s
Burst Mode
TM Operation at Light Load
s
Low Dropout: 100% Duty Cycle
s
0.8V Reference Allows Low Output Voltages
s
±2.5% Reference Accuracy
s
Current Mode Operation for Excellent Line and Load
Transient Response
s
Low Quiescent Current: 110
A
s
Shutdown Mode Draws Only 8
A Supply Current
s
Tiny 6-Lead SOT-23 Package
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
Efficiency vs Load Current
ITH/RUN
LTC1779
20k
169k
78.7k
R1
10
L1
22
H
D1
100pF
GND
VFB
6
5
4
1779 F01a
1
2
3
SW
VIN
SENSE–
C1
10
F
16V
C3
0.1
F
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: SANYO POSCAP 6TPA47M
D1: IR10BQ015
L1: COILTRONICS UP1B220
VIN
2.5V
TO 9.8V
VOUT
2.5V
100mA
C2
47
F
6V
+
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
LOAD CURRENT (mA)
50
EFFICIENCY
(%)
70
90
100
0.1
10
100
1000
1779 F01b
30
1
80
60
40
VIN = 3.3V
VIN = 6V
VIN = 9.8V
VOUT = 2.5V
RSENSE = 10
Electrical Specifications Subject to Change
Specifications on this data sheet are preliminary only, and subject to change
without notice. Contact the manufacturer before finalizing a design using this part.
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