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參數資料
| 型號： | LT1767EMS8#TR-1.8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 232K |
| 代理商： | LT1767EMS8#TR-1.8 |
1
LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
Monolithic 1.5A, 1.25MHz
Step-Down Switching Regulators
s
1.5A Switch in a Small MSOP-8 Package
s
Constant 1.25MHz Switching Frequency
s
Wide Operating Voltage Range: 3V to 25V
s
High Efficiency 0.22
Switch
s
1.2V Feedback Reference Voltage
s
Fixed Output Voltages of 1.8V, 2.5V, 3.3V, 5V
s
2% Overall Output Tolerance
s
Uses Low Profile Surface Mount Components
s
Low Shutdown Current: 6
A
s
Synchronizable to 2MHz
s
Current Mode Loop Control
s
Constant Maximum Switch Current Rating at All Duty
Cycles*
The LT
1767 is a 1.25MHz monolithic buck switching
regulator. A high efficiency 1.5A, 0.22
switch is included
on the die together with all the control circuitry required to
complete a high frequency, current mode switching regu-
lator. Current mode control provides fast transient re-
sponse and excellent loop stability.
New design techniques achieve high efficiency at high
switching frequencies over a wide operating range. A low
dropout internal regulator maintains consistent perfor-
mance over a wide range of inputs from 24V systems to Li-
Ion batteries. An operating supply current of 1mA im-
proves efficiency, especially at lower output currents.
Shutdown reduces quiescent current to 6
A. Maximum
switch current remains constant at all duty cycles. Syn-
chronization allows an external logic level signal to in-
crease the internal oscillator from 1.4MHz to 2MHz.
The LT1767 is available in an 8-pin MSOP fused leadframe
package. Full cycle-by-cycle short-circuit protection and
thermal shutdown are provided. High frequency operation
allows the reduction of input and output filtering compo-
nents and permits the use of chip inductors.
s
DSL Modems
s
Portable Computers
s
Wall Adapters
s
Battery-Powered Systems
s
Distributed Power
, LTC and LT are registered trademarks of Linear Technology Corporation.
Efficiency vs Load Current
12V to 3.3V Step-Down Converter
BOOST
LT1767-3.3
VIN
OUTPUT
3.3V
1.2A*
INPUT
12V
1767 TA01
C2
0.1
F
CC
1.5nF
RC
4.7k
D1
MBRS130T3
C1
10
F
CERAMIC
C3
2.2
F
CERAMIC
D2
1N914
L1
5
H
VSW
FB
SHDN
OPEN
OR
HIGH
= ON
GND
VC
SYNC
*MAXIMUM OUTPUT CURRENT IS SUBJECT TO THERMAL DERATING.
LOAD CURRENT (A)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
EFFICIENCY
(%)
1767 TA01a
95
90
85
80
75
70
VIN = 10V
VOUT = 5V
VIN = 5V
VOUT = 3.3V
*Patent Pending
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
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