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LT1767EMS8E-5#TR

Description
Conv DC-DC 3V to 25V Synchronous Step Down Single-Out 5V 1.5A 8-Pin MSOP EP T/R
File Size236KB,16 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LT1767EMS8E-5#TR Overview

Conv DC-DC 3V to 25V Synchronous Step Down Single-Out 5V 1.5A 8-Pin MSOP EP T/R

LT1767EMS8E-5#TR Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesNot Compliant
ECCN (US)EAR99
Part StatusUnconfirmed
HTS8542.39.00.01
SVHCYes
SVHC Exceeds ThresholdYes
TypeSynchronous Step Down
Output TypeFixed
Switching Frequency (kHz)1400
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)5
Maximum Output Current (A)1.5
Minimum Input Voltage (V)3
Maximum Input Voltage (V)25
Operating Supply Voltage (V)3 to 25
Typical Switch Current (A)2
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)125
Supplier Temperature GradeExtended
PackagingTape and Reel
Pin Count8
Standard Package NameSOP
Supplier PackageMSOP EP
MountingSurface Mount
Package Height0.86
Package Length3
Package Width3
PCB changed8
Lead ShapeGull-wing
LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
Monolithic 1.5A, 1.25MHz
Step-Down Switching Regulators
FEATURES
s
s
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s
s
s
s
s
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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 0.22Ω 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: 6µA
Synchronizable to 2MHz
Current Mode Loop Control
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, 0.22Ω 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 6µA. 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
s
s
s
s
s
DSL Modems
Portable Computers
Wall Adapters
Battery-Powered Systems
Distributed Power
TYPICAL APPLICATIO
12V to 3.3V Step-Down Converter
D2
CMDSH-3
C2
0.1µF
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
5µH
EFFICIENCY (%)
C3
2.2µF
CERAMIC
V
SW
OUTPUT
3.3V
1.2A*
D1
UPS120
C1
10µF
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
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