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參數(shù)資料
| 型號： | LTC1772IS6#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MO-193, SOT-23, 6 PIN |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 158K |
| 代理商： | LTC1772IS6#PBF |
1
LTC1772
1772fb
Constant Frequency
Current Mode Step-Down
DC/DC Controller in SOT-23
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 provides a
±2.5% output voltage accuracy
and consumes only 270
A of quiescent current. For
applications 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%dutycycle).In shutdown, the device draws
a mere 8
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.
■ One or Two Lithium-Ion-Powered Applications
■
Cellular Telephones
■ Wireless Modems
■ Portable Computers
■
Distributed 3.3V, 2.5V or 1.8V Power Systems
■ Scanners
■
High Efficiency: Up to 94%
■ High Output Currents Easily Achieved
■ Wide VIN Range: 2.5V to 9.8V
■
Constant Frequency 550kHz Operation
■ Burst Mode
Operation at Light Load
■ Low Dropout: 100% Duty Cycle
■
Tiny 6-Lead SOT-23 Package
■ 0.8V Reference Allows Low Output Voltages
■ Current Mode Operation for Excellent Line and Load
Transient Response
■ Low Quiescent Current: 270
A
■ Shutdown Mode Draws Only 8
A Supply Current
■
±2.5% Reference Accuracy
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Figure 1. High Efficiency, High Output Current 2.5V/2A Regulator
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
ITH/RUN
LTC1772
10k
R1
0.03
174k
80.6k
L1
4.7
H
M1
D1
220pF
C1: TAIYO YUDEN LMK325BJ106K-T
C2A: SANYO 6TPA47M
C2B: AVX 0805ZC105KAT1A
D1: MOTOROLA MBRM120T3
L1: MURATA LQN6C-4R7
M1: FAIRCHILD FDC638P
R1: IRC LRC-LR1206-01-R030F
GND
VFB
6
5
4
1772 F01a
1
2
3
PGATE
VIN
SENSE–
C1
10
F
10V
C2B
1
F
10V
VIN
2.5V
TO 9.8V
VOUT
2.5V
2A
C2A
47
F
6V
+
LOAD CURRENT (mA)
EFFICIENCY
(%)
100
90
80
70
60
50
40
100
1000
10000
10
1
VOUT = 2.5V
VIN = 6V
1772 F01b
VIN = 8.4V
VIN = 9.8V
VIN = 3.3V
VIN = 4.2V
Efficiency vs Load Current
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