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LT1767EMS8E-5#TRPBF

Description
Switching Regulator 1.5A, 1.25MHz Step-dn Converter
CategoryPower/power management    The power supply circuit   
File Size430KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
Environmental Compliance
Download Datasheet Parametric View All

LT1767EMS8E-5#TRPBF Overview

Switching Regulator 1.5A, 1.25MHz Step-dn Converter

LT1767EMS8E-5#TRPBF Parametric

Parameter NameAttribute value
Brand NameAnalog Devices Inc
Is it lead-free?Contains lead
Is it Rohs certified?conform to
MakerADI
package instructionHTSSOP,
Contacts8
Manufacturer packaging code05-08-1662
Reach Compliance Codecompliant
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Maximum input voltage25 V
Minimum input voltage3 V
Nominal input voltage15 V
JESD-30 codeS-PDSO-G8
JESD-609 codee3
length3 mm
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature125 °C
Minimum operating temperature
Maximum output current3 A
Nominal output voltage5 V
Package body materialPLASTIC/EPOXY
encapsulated codeHTSSOP
Package shapeSQUARE
Package formSMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)250
Certification statusNot Qualified
Maximum seat height1.1 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency1500 kHz
Temperature levelOTHER
Terminal surfaceMATTE TIN
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width3 mm
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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DescripTion
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
regulator. Current mode control provides fast transient
response 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 per-
formance over a wide range of inputs from 24V systems
to Li-Ion batteries. An operating supply current of 1mA
improves 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 increase
the internal oscillator from 1.5MHz to 2MHz.
The LT1767 is available in an 8-pin MSOP fused lead-frame
package and a low thermal resistance exposed pad package.
Full cycle-by-cycle current limit and thermal shutdown are
provided. High frequency operation allows the reduction
of input and output filtering components and permits the
use of chip inductors.
L,
LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents, including 6611131, 6498466.
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*
applicaTions
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n
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DSL Modems
Portable Computers
Wall Adapters
Battery-Powered Systems
Distributed Power
Typical applicaTion
12V to 3.3V Step-Down Converter
D2
CMDSH-3
C2
0.1µF
V
IN
12V
V
IN
OPEN
OR
HIGH
= ON
SHDN
SYNC
BOOST
LT1767-3.3
FB
GND
V
C
C
C
1.5nF
D1
UPS120
C1
10µF
CERAMIC
V
SW
Efficiency vs Load Current
95
V
IN
= 10V
V
OUT
= 5V
90
EFFICIENCY (%)
L1
5µH
C3
2.2µF
CERAMIC
OUTPUT
3.3V
1.2A*
85
80
75
R
C
4.7k
70
0
0.2
*MAXIMUM OUTPUT CURRENT IS SUBJECT TO THERMAL DERATING.
0.4 0.6 0.8
1
LOAD CURRENT (A)
1.2
1.4
1767 TA01
1767 TA01a
1767fb
For more information
www.linear.com/LT1767
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