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LT1767EMS8-2.5 Datasheet

  • LT1767EMS8-2.5

  • Monolithic 1.5A, 1.25MHz Step-Down Switching Regulators

  • 16頁

  • LINER

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LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
Monolithic 1.5A, 1.25MHz
Step-Down Switching Regulators
FEATURES
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DESCRIPTIO
1.5A Switch in a Small MSOP Package
Constant 1.25MHz Switching Frequency
High Power Exposed Pad (MS8E) Package
Wide Operating Voltage Range: 3V to 25V
High Efficiency 0.22鈩?Switch
1.2V Feedback Reference Voltage
Fixed Output Voltages of 1.8V, 2.5V, 3.3V, 5V
2% Overall Output Tolerance
Uses Low Profile Surface Mount Components
Low Shutdown Current: 6碌A(chǔ)
Synchronizable to 2MHz
Current Mode Loop Control
Constant Maximum Switch Current Rating at All Duty
Cycles*
The LT
廬
1767 is a 1.25MHz monolithic buck switching
regulator. A high efficiency 1.5A, 0.22鈩?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碌A(chǔ). 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 and a low thermal resistance exposed pad pack-
age. Full cycle-by-cycle short-circuit protection and ther-
mal shutdown are provided. High frequency operation
allows the reduction of input and output filtering compo-
nents and permits the use of chip inductors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*Patent Pending
APPLICATIO S
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DSL Modems
Portable Computers
Wall Adapters
Battery-Powered Systems
Distributed Power
TYPICAL APPLICATIO
12V to 3.3V Step-Down Converter
D2
CMDSH-3
C2
0.1碌F
V
IN
12V
BOOST
V
IN
OPEN
OR
HIGH
= ON
LT1767-3.3
SHDN
SYNC
FB
GND
V
C
C
C
1.5nF
R
C
4.7k
*MAXIMUM OUTPUT CURRENT IS SUBJECT TO THERMAL DERATING.
1767 TA01
L1
5碌H
EFFICIENCY (%)
C3
2.2碌F
CERAMIC
V
SW
OUTPUT
3.3V
1.2A*
D1
UPS120
C1
10碌F
CERAMIC
U
Efficiency vs Load Current
95
V
IN
= 10V
V
OUT
= 5V
90
85
V
IN
= 5V
V
OUT
= 3.3V
80
75
70
0
0.2
0.4 0.6 0.8
1
LOAD CURRENT (A)
1.2
1.4
1767 TA01a
U
U
sn1767 1767fas
1

LT1767EMS8-2.5 產(chǎn)品屬性

  • LT1767/-1.8/2.5/3.3/5

  • 50

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器

  • -

  • 降壓（降壓）

  • 固定

  • 1

  • 2.5V

  • 3 V ~ 25 V

  • 電流模式

  • 1.25MHz

  • 1.5A

  • 無

  • -40°C ~ 125°C

  • 表面貼裝

  • 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）

  • 管件

  • 8-MSOP

  • LT1767EMS82.5

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