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參數(shù)資料
| 型號(hào)： | LT1622 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low Input Voltage Current Mode Step-Down DC/DC Controller(低輸入電壓，電流模式步降DC/DC控制器) |
| 中文描述： | 低輸入電壓電流模式降壓DC / DC控制器（低輸入電壓，電流模式步降直流/直流控制器） |
| 文件頁(yè)數(shù)： | 1/16頁(yè) |
| 文件大?。?/td> | 223K |
| 代理商： | LT1622 |
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1
LTC1622
Low Input Voltage
Current Mode Step-Down
DC/DC Controller
The LTC
1622 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 feature that shuts the LTC1622 down when
the input voltage falls below 2V.
The LTC1622 boasts a
±
1.9% output voltage accuracy and
consumes only 350
μ
A of quiescent current. For applica-
tions where efficiency is a prime consideration and the
load current varies from light to heavy, the LTC1622 can
be configured for Burst Mode
TM
operation. Burst Mode
operation enhances low current efficiency and extends
battery run time. Burst Mode operation is inhibited during
synchronization or when the SYNC/MODE pin is pulled low
to reduce noise and possible RF interference.
High constant operating frequency of 550kHz allows the
use of a small inductor. The device can also be synchro-
nized up to 750kHz for special applications. The high
frequency operation and the available 8-lead MSOP pack-
age create a high performance solution in an extremely
small amount of PCB area.
To further maximize the life of the battery source, the
P-channel MOSFET is turned on continuously in dropout
(100% duty cycle). In shutdown, the device draws a mere
15
μ
A.
I
1- or 2-Cell Li-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
Battery-Powered Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
High Efficiency
I
Constant Frequency 550kHz Operation
I
V
IN
Range: 2V to 10V
I
Multiampere Output Currents
I
OPTI-LOOP
TM
Compensation Minimizes C
OUT
I
Selectable, Burst Mode
Operation
I
Low Dropout Operation: 100% Duty Cycle
I
Synchronizable up to 750kHz
I
Current Mode Operation for Excellent Line and Load
Transient Response
I
Low Quiescent Current: 350
μ
A
I
Shutdown Mode Draws Only 15
μ
A Supply Current
I
±
1.9% Reference Accuracy
I
Available in 8-Lead MSOP
APPLICATIU
Burst Mode and OPTI-LOOP are a trademarks of Linear Technology Corporation.
FEATURES
DESCRIPTIOU
TYPICAL APPLICATIO
U
Figure 1. High Efficiency Step-Down Converter
2
4
1
8
V
IN
7
5
6
3
SYNC/MODE
RUN/SS
L1
4.7
μ
H
R2
0.03
D1
Si3443DV
R3
159k
V
2.5V
1.5A
C2
47
μ
F
6V
R1
10k
C3
220pF
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: SANYO POSCAP 6TPA47M
D1: INTERNATIONAL RECTIFIER IR10BQ015
V
2.5V TO 8.5V
R4
75k
1622 F01a
470pF
C1
10
μ
F
10V
LTC1622
V
FB
+
SENSE
–
PDRV
I
TH
GND
L1: MURATA LQN6C-4R7
R2: DALE WSL-1206 0-03
LOAD CURRENT (mA)
E
100
90
80
70
60
50
40
1
100
1000
5000
1622 F01b
10
V
OUT
= 2.5V
R
SENSE
= 0.03
V
IN
= 3.3V
V
IN
= 6V
V
IN
= 8.4V
V
IN
= 4.2V
Efficiency vs Load Current with
Burst Mode Operation Enabled
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相關(guān)代理商/技術(shù)參數(shù) |
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